From c6caaafde762d69d690cfc89133dba5e840d98e6 Mon Sep 17 00:00:00 2001
From: Stephen Moody <steve.moody73@gmail.com>
Date: Fri, 16 Aug 2019 11:38:16 +0100
Subject: [PATCH] Added USART, shiftregister and command line parser code

---
 .cproject               | 112 +++++++++++----------
 EPROMEmu.elf.launch     |  90 +++++++++--------
 Inc/commands.h          |  27 +++++
 Inc/gpio.h              |   3 +
 Inc/shiftregister.h     |  18 ++++
 Inc/timers.h            |   2 +
 Inc/usart.h             |  46 +++++++++
 Src/commands.c          | 116 ++++++++++++++++++++++
 Src/gpio.c              |  11 ++-
 Src/main.c              |  18 +++-
 Src/shiftregister.c     |  99 +++++++++++++++++++
 Src/stm32f0xx_hal_msp.c |  84 ----------------
 Src/stm32f0xx_system.c  |  21 ++--
 Src/syscalls.c          |   9 +-
 Src/timers.c            |   4 +
 Src/usart.c             | 213 +++++++++++++++++++++++++++++++++++++++-
 16 files changed, 682 insertions(+), 191 deletions(-)
 create mode 100644 Inc/commands.h
 create mode 100644 Inc/shiftregister.h
 create mode 100644 Src/commands.c
 create mode 100644 Src/shiftregister.c
 delete mode 100644 Src/stm32f0xx_hal_msp.c

diff --git a/.cproject b/.cproject
index 1f74918..f0d3c2c 100644
--- a/.cproject
+++ b/.cproject
@@ -15,64 +15,64 @@
 				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe" cleanCommand="rm -rf" description="" id="com.atollic.truestudio.exe.debug.1518366166" name="Debug" parent="com.atollic.truestudio.exe.debug" postbuildStep="arm-atollic-eabi-objcopy.exe -O ihex &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.hex&quot;" prebuildStep="">
 					<folderInfo id="com.atollic.truestudio.exe.debug.1518366166.2031504340" name="/" resourcePath="">
 						<toolChain id="com.atollic.truestudio.exe.debug.toolchain.683225115" name="Atollic ARM Tools" superClass="com.atollic.truestudio.exe.debug.toolchain">
-							<option id="com.atollic.truestudio.general.runtimelib.1557952293" superClass="com.atollic.truestudio.general.runtimelib" value="com.atollic.truestudio.ld.general.clib.small" valueType="enumerated"/>
-							<option id="com.atollic.truestudio.toolchain_options.mcu.1546266502" superClass="com.atollic.truestudio.toolchain_options.mcu" value="STM32F030RC" valueType="string"/>
-							<option id="com.atollic.truestudio.toolchain_options.vendor.3396250" superClass="com.atollic.truestudio.toolchain_options.vendor" value="STMicroelectronics" valueType="string"/>
+							<option id="com.atollic.truestudio.general.runtimelib.1557952293" name="Runtime Library" superClass="com.atollic.truestudio.general.runtimelib" useByScannerDiscovery="false" value="com.atollic.truestudio.ld.general.clib.standard" valueType="enumerated"/>
+							<option id="com.atollic.truestudio.toolchain_options.mcu.1546266502" name="Microcontroller" superClass="com.atollic.truestudio.toolchain_options.mcu" useByScannerDiscovery="false" value="STM32F030RC" valueType="string"/>
+							<option id="com.atollic.truestudio.toolchain_options.vendor.3396250" name="Vendor name" superClass="com.atollic.truestudio.toolchain_options.vendor" useByScannerDiscovery="false" value="STMicroelectronics" valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.atollic.truestudio.exe.debug.toolchain.platform.2054752829" isAbstract="false" name="Debug platform" superClass="com.atollic.truestudio.exe.debug.toolchain.platform"/>
-							<builder buildPath="${workspace_loc:/EPROMEmu}/Debug" id="com.atollic.truestudio.mbs.builder1.1222194476" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="com.atollic.truestudio.mbs.builder1">
+							<builder buildPath="${workspace_loc:/EPROMEmu}/Debug" customBuilderProperties="toolChainpathType=1|toolChainpathString=C:\\Program Files (x86)\\Atollic\\TrueSTUDIO for STM32 9.3.0\\ARMTools\\bin|" id="com.atollic.truestudio.mbs.builder1.1222194476" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="com.atollic.truestudio.mbs.builder1">
 								<outputEntries>
 									<entry flags="VALUE_WORKSPACE_PATH|RESOLVED" kind="outputPath" name="Debug"/>
 								</outputEntries>
 							</builder>
 							<tool command="arm-atollic-eabi-gcc -c" commandLinePattern="${COMMAND} ${FLAGS} ${OUTPUT_FLAG}${OUTPUT_PREFIX} ${OUTPUT} ${INPUTS}" id="com.atollic.truestudio.exe.debug.toolchain.as.1545899283" name="Assembler" superClass="com.atollic.truestudio.exe.debug.toolchain.as">
-								<option id="com.atollic.truestudio.common_options.target.endianess.1608144567" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.mcpu.286463162" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" value="STM32F030RC" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.instr_set.2033833414" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.as.general.incpath.770237934" name="Include path" superClass="com.atollic.truestudio.as.general.incpath"/>
-								<option id="com.atollic.truestudio.gcc.symbols.defined.1670122205" name="Defined symbols" superClass="com.atollic.truestudio.gcc.symbols.defined"/>
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-								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.endianess.1608144567" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
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+								<option id="com.atollic.truestudio.as.general.incpath.770237934" name="Include path" superClass="com.atollic.truestudio.as.general.incpath" useByScannerDiscovery="false"/>
+								<option id="com.atollic.truestudio.gcc.symbols.defined.1670122205" name="Defined symbols" superClass="com.atollic.truestudio.gcc.symbols.defined" useByScannerDiscovery="false"/>
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+								<option id="com.atollic.truestudio.as.general.warnings.1324541152" name="Suppress warnings " superClass="com.atollic.truestudio.as.general.warnings" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 								<inputType id="com.atollic.truestudio.as.input.374932590" name="Input" superClass="com.atollic.truestudio.as.input"/>
 							</tool>
 							<tool command="arm-atollic-eabi-gcc -c " commandLinePattern="${COMMAND} ${FLAGS} ${OUTPUT_FLAG}${OUTPUT_PREFIX} ${OUTPUT} ${INPUTS}" id="com.atollic.truestudio.exe.debug.toolchain.gcc.1836874447" name="C Compiler" superClass="com.atollic.truestudio.exe.debug.toolchain.gcc">
-								<option id="com.atollic.truestudio.gcc.directories.select.330946435" name="Include path" superClass="com.atollic.truestudio.gcc.directories.select" valueType="includePath">
+								<option id="com.atollic.truestudio.gcc.directories.select.330946435" name="Include path" superClass="com.atollic.truestudio.gcc.directories.select" useByScannerDiscovery="false" valueType="includePath">
 									<listOptionValue builtIn="false" value="../Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/STM32F0xx_HAL_Driver/Inc"/>
 									<listOptionValue builtIn="false" value="../Drivers/STM32F0xx_HAL_Driver/Inc/Legacy"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Device/ST/STM32F0xx/Include"/>
 									<listOptionValue builtIn="false" value="../Drivers/CMSIS/Include"/>
 								</option>
-								<option id="com.atollic.truestudio.gcc.symbols.defined.1670122205" name="Defined symbols" superClass="com.atollic.truestudio.gcc.symbols.defined" valueType="definedSymbols">
+								<option id="com.atollic.truestudio.gcc.symbols.defined.1670122205" name="Defined symbols" superClass="com.atollic.truestudio.gcc.symbols.defined" useByScannerDiscovery="false" valueType="definedSymbols">
 									<listOptionValue builtIn="false" value="__weak=__attribute__((weak))"/>
 									<listOptionValue builtIn="false" value="__packed=__attribute__((__packed__))"/>
 									<listOptionValue builtIn="false" value="USE_HAL_DRIVER"/>
 									<listOptionValue builtIn="false" value="STM32F030xC"/>
 								</option>
-								<option id="com.atollic.truestudio.common_options.target.endianess.1854274048" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.mcpu.191909026" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" value="STM32F030RC" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.instr_set.1503159865" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.gcc.optimization.prep_garbage.586275206" name="Prepare dead code removal" superClass="com.atollic.truestudio.gcc.optimization.prep_garbage" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.gcc.optimization.prep_data.1044766448" name="Prepare dead data removal" superClass="com.atollic.truestudio.gcc.optimization.prep_data" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.gcc.misc.otherflags.895097519" name="Other options" superClass="com.atollic.truestudio.gcc.misc.otherflags" value="" valueType="string"/>
-								<option id="com.atollic.truestudio.exe.debug.toolchain.gcc.optimization.level.1763412676" name="Optimization Level" superClass="com.atollic.truestudio.exe.debug.toolchain.gcc.optimization.level" value="com.atollic.truestudio.gcc.optimization.level.0s" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.interwork.1173495076" name="Mix ARM/Thumb" superClass="com.atollic.truestudio.common_options.target.interwork"/>
+								<option id="com.atollic.truestudio.common_options.target.endianess.1854274048" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
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+								<option id="com.atollic.truestudio.common_options.target.instr_set.1503159865" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
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+								<option id="com.atollic.truestudio.gcc.optimization.prep_data.1044766448" name="Prepare dead data removal" superClass="com.atollic.truestudio.gcc.optimization.prep_data" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.gcc.misc.otherflags.895097519" name="Other options" superClass="com.atollic.truestudio.gcc.misc.otherflags" useByScannerDiscovery="false" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.exe.debug.toolchain.gcc.optimization.level.1763412676" name="Optimization Level" superClass="com.atollic.truestudio.exe.debug.toolchain.gcc.optimization.level" useByScannerDiscovery="false" value="com.atollic.truestudio.gcc.optimization.level.0g" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.interwork.1173495076" name="Mix ARM/Thumb" superClass="com.atollic.truestudio.common_options.target.interwork" useByScannerDiscovery="false"/>
 								<inputType id="com.atollic.truestudio.gcc.input.850396938" superClass="com.atollic.truestudio.gcc.input"/>
 							</tool>
 							<tool id="com.atollic.truestudio.exe.debug.toolchain.ld.1444973427" name="C Linker" superClass="com.atollic.truestudio.exe.debug.toolchain.ld">
-								<option id="com.atollic.truestudio.common_options.target.endianess.662778612" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.mcpu.35700531" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" value="STM32F030RC" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.instr_set.566688004" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.ld.general.scriptfile.1350476438" name="Linker script" superClass="com.atollic.truestudio.ld.general.scriptfile" value="../STM32F030RC_FLASH.ld" valueType="string"/>
-								<option id="com.atollic.truestudio.ld.optimization.do_garbage.1816004776" name="Dead code removal" superClass="com.atollic.truestudio.ld.optimization.do_garbage" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.ld.libraries.list.848669414" superClass="com.atollic.truestudio.ld.libraries.list"/>
-								<option id="com.atollic.truestudio.ld.libraries.searchpath.1273009461" superClass="com.atollic.truestudio.ld.libraries.searchpath"/>
-								<option id="com.atollic.truestudio.ld.misc.linkerflags.1948405714" superClass="com.atollic.truestudio.ld.misc.linkerflags" value="" valueType="string"/>
-								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.endianess.662778612" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.mcpu.35700531" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" useByScannerDiscovery="false" value="STM32F030RC" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.instr_set.566688004" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.ld.general.scriptfile.1350476438" name="Linker script" superClass="com.atollic.truestudio.ld.general.scriptfile" useByScannerDiscovery="false" value="../STM32F030RC_FLASH.ld" valueType="string"/>
+								<option id="com.atollic.truestudio.ld.optimization.do_garbage.1816004776" name="Dead code removal " superClass="com.atollic.truestudio.ld.optimization.do_garbage" useByScannerDiscovery="false" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.ld.libraries.list.848669414" name="Libraries" superClass="com.atollic.truestudio.ld.libraries.list" useByScannerDiscovery="false"/>
+								<option id="com.atollic.truestudio.ld.libraries.searchpath.1273009461" name="Library search path" superClass="com.atollic.truestudio.ld.libraries.searchpath" useByScannerDiscovery="false"/>
+								<option id="com.atollic.truestudio.ld.misc.linkerflags.1948405714" name="Other options" superClass="com.atollic.truestudio.ld.misc.linkerflags" useByScannerDiscovery="false" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
+								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" useByScannerDiscovery="false" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 								<inputType id="com.atollic.truestudio.ld.input.1372975870" name="Input" superClass="com.atollic.truestudio.ld.input">
 									<additionalInput kind="additionalinputdependency" paths="$(USER_OBJS)"/>
 									<additionalInput kind="additionalinput" paths="$(LIBS)"/>
@@ -107,9 +107,9 @@
 								<option id="com.atollic.truestudio.common_options.target.instr_set.1600237525" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.ldcc.general.scriptfile.561304432" name="Linker script" superClass="com.atollic.truestudio.ldcc.general.scriptfile" value="../STM32F030RC_FLASH.ld" valueType="string"/>
 								<option id="com.atollic.truestudio.ldcc.optimization.do_garbage.956844137" name="Dead code removal" superClass="com.atollic.truestudio.ldcc.optimization.do_garbage" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.ldcc.libraries.list.848669414" superClass="com.atollic.truestudio.ldcc.libraries.list"/>
-								<option id="com.atollic.truestudio.ldcc.libraries.searchpath.1273009461" superClass="com.atollic.truestudio.ldcc.libraries.searchpath"/>
-								<option id="com.atollic.truestudio.ldcc.misc.linkerflags.1948405714" superClass="com.atollic.truestudio.ldcc.misc.linkerflags" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.ldcc.libraries.list.848669414" name="Libraries" superClass="com.atollic.truestudio.ldcc.libraries.list"/>
+								<option id="com.atollic.truestudio.ldcc.libraries.searchpath.1273009461" name="Library search path" superClass="com.atollic.truestudio.ldcc.libraries.searchpath"/>
+								<option id="com.atollic.truestudio.ldcc.misc.linkerflags.1948405714" name="Other options" superClass="com.atollic.truestudio.ldcc.misc.linkerflags" value="" valueType="string"/>
 								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 							</tool>
@@ -147,9 +147,9 @@
 				<configuration artifactExtension="elf" artifactName="${ProjName}" buildArtefactType="org.eclipse.cdt.build.core.buildArtefactType.exe" buildProperties="org.eclipse.cdt.build.core.buildArtefactType=org.eclipse.cdt.build.core.buildArtefactType.exe" cleanCommand="rm -rf" description="" id="com.atollic.truestudio.configuration.release.1518366166" name="Release" parent="com.atollic.truestudio.configuration.release" postbuildStep="arm-atollic-eabi-objcopy.exe -O ihex &quot;${BuildArtifactFileBaseName}.elf&quot; &quot;${BuildArtifactFileBaseName}.hex&quot;" prebuildStep="">
 					<folderInfo id="com.atollic.truestudio.configuration.release.1518366166.2031504340" name="/" resourcePath="">
 						<toolChain id="com.atollic.truestudio.exe.release.toolchain.683225115" name="Atollic ARM Tools" superClass="com.atollic.truestudio.exe.release.toolchain">
-							<option id="com.atollic.truestudio.general.runtimelib.1816224464" superClass="com.atollic.truestudio.general.runtimelib" value="com.atollic.truestudio.ld.general.clib.small" valueType="enumerated"/>
-							<option id="com.atollic.truestudio.toolchain_options.mcu.1158682477" superClass="com.atollic.truestudio.toolchain_options.mcu" value="STM32F030RC" valueType="string"/>
-							<option id="com.atollic.truestudio.toolchain_options.vendor.409123398" superClass="com.atollic.truestudio.toolchain_options.vendor" value="STMicroelectronics" valueType="string"/>
+							<option id="com.atollic.truestudio.general.runtimelib.1816224464" name="Runtime Library" superClass="com.atollic.truestudio.general.runtimelib" value="com.atollic.truestudio.ld.general.clib.small" valueType="enumerated"/>
+							<option id="com.atollic.truestudio.toolchain_options.mcu.1158682477" name="Microcontroller" superClass="com.atollic.truestudio.toolchain_options.mcu" value="STM32F030RC" valueType="string"/>
+							<option id="com.atollic.truestudio.toolchain_options.vendor.409123398" name="Vendor name" superClass="com.atollic.truestudio.toolchain_options.vendor" value="STMicroelectronics" valueType="string"/>
 							<targetPlatform archList="all" binaryParser="org.eclipse.cdt.core.ELF" id="com.atollic.truestudio.exe.release.toolchain.platform.2054752829" isAbstract="false" name="Release platform" superClass="com.atollic.truestudio.exe.release.toolchain.platform"/>
 							<builder buildPath="${workspace_loc:/EPROMEmu}/Release" id="com.atollic.truestudio.mbs.builder1.1222194476" keepEnvironmentInBuildfile="false" managedBuildOn="true" name="CDT Internal Builder" superClass="com.atollic.truestudio.mbs.builder1">
 								<outputEntries>
@@ -162,8 +162,8 @@
 								<option id="com.atollic.truestudio.common_options.target.instr_set.2033833414" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.as.general.incpath.770237934" name="Include path" superClass="com.atollic.truestudio.as.general.incpath"/>
 								<option id="com.atollic.truestudio.gcc.symbols.defined.1670122205" name="Defined symbols" superClass="com.atollic.truestudio.gcc.symbols.defined"/>
-								<option id="com.atollic.truestudio.as.general.otherflags.51384659" superClass="com.atollic.truestudio.as.general.otherflags" value="" valueType="string"/>
-								<option id="com.atollic.truestudio.as.general.warnings.1324541152" superClass="com.atollic.truestudio.as.general.warnings" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.as.general.otherflags.51384659" name="Other options" superClass="com.atollic.truestudio.as.general.otherflags" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.as.general.warnings.1324541152" name="Suppress warnings " superClass="com.atollic.truestudio.as.general.warnings" value="true" valueType="boolean"/>
 								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 								<inputType id="com.atollic.truestudio.as.input.374932590" name="Input" superClass="com.atollic.truestudio.as.input"/>
@@ -185,7 +185,7 @@
 								<option id="com.atollic.truestudio.common_options.target.endianess.1854274048" name="Endianess" superClass="com.atollic.truestudio.common_options.target.endianess" value="com.atollic.truestudio.common_options.target.endianess.little" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.mcpu.191909026" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" value="STM32F030RC" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.instr_set.1503159865" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
-								<option id="com.atollic.truestudio.gcc.optimization.prep_garbage.586275206" name="Prepare dead code removal" superClass="com.atollic.truestudio.gcc.optimization.prep_garbage" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.gcc.optimization.prep_garbage.586275206" name="Prepare dead code removal " superClass="com.atollic.truestudio.gcc.optimization.prep_garbage" value="true" valueType="boolean"/>
 								<option id="com.atollic.truestudio.gcc.optimization.prep_data.1044766448" name="Prepare dead data removal" superClass="com.atollic.truestudio.gcc.optimization.prep_data" value="true" valueType="boolean"/>
 								<option id="com.atollic.truestudio.gcc.misc.otherflags.895097519" name="Other options" superClass="com.atollic.truestudio.gcc.misc.otherflags" value="" valueType="string"/>
 								<option id="com.atollic.truestudio.exe.release.toolchain.gcc.optimization.level.1763412676" name="Optimization Level" superClass="com.atollic.truestudio.exe.release.toolchain.gcc.optimization.level" value="com.atollic.truestudio.gcc.optimization.level.0s" valueType="enumerated"/>
@@ -199,10 +199,10 @@
 								<option id="com.atollic.truestudio.common_options.target.mcpu.35700531" name="Microcontroller" superClass="com.atollic.truestudio.common_options.target.mcpu" value="STM32F030RC" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.instr_set.566688004" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.ld.general.scriptfile.1350476438" name="Linker script" superClass="com.atollic.truestudio.ld.general.scriptfile" value="../STM32F030RC_FLASH.ld" valueType="string"/>
-								<option id="com.atollic.truestudio.ld.optimization.do_garbage.1816004776" name="Dead code removal" superClass="com.atollic.truestudio.ld.optimization.do_garbage" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.ld.libraries.list.848669414" superClass="com.atollic.truestudio.ld.libraries.list"/>
-								<option id="com.atollic.truestudio.ld.libraries.searchpath.1273009461" superClass="com.atollic.truestudio.ld.libraries.searchpath"/>
-								<option id="com.atollic.truestudio.ld.misc.linkerflags.1948405714" superClass="com.atollic.truestudio.ld.misc.linkerflags" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.ld.optimization.do_garbage.1816004776" name="Dead code removal " superClass="com.atollic.truestudio.ld.optimization.do_garbage" value="true" valueType="boolean"/>
+								<option id="com.atollic.truestudio.ld.libraries.list.848669414" name="Libraries" superClass="com.atollic.truestudio.ld.libraries.list"/>
+								<option id="com.atollic.truestudio.ld.libraries.searchpath.1273009461" name="Library search path" superClass="com.atollic.truestudio.ld.libraries.searchpath"/>
+								<option id="com.atollic.truestudio.ld.misc.linkerflags.1948405714" name="Other options" superClass="com.atollic.truestudio.ld.misc.linkerflags" value="" valueType="string"/>
 								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 								<inputType id="com.atollic.truestudio.ld.input.1372975870" name="Input" superClass="com.atollic.truestudio.ld.input">
@@ -239,9 +239,9 @@
 								<option id="com.atollic.truestudio.common_options.target.instr_set.1600237525" name="Instruction set" superClass="com.atollic.truestudio.common_options.target.instr_set" value="com.atollic.truestudio.common_options.target.instr_set.thumb2" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.ldcc.general.scriptfile.561304432" name="Linker script" superClass="com.atollic.truestudio.ldcc.general.scriptfile" value="../STM32F030RC_FLASH.ld" valueType="string"/>
 								<option id="com.atollic.truestudio.ldcc.optimization.do_garbage.956844137" name="Dead code removal" superClass="com.atollic.truestudio.ldcc.optimization.do_garbage" value="true" valueType="boolean"/>
-								<option id="com.atollic.truestudio.ldcc.libraries.list.848669414" superClass="com.atollic.truestudio.ldcc.libraries.list"/>
-								<option id="com.atollic.truestudio.ldcc.libraries.searchpath.1273009461" superClass="com.atollic.truestudio.ldcc.libraries.searchpath"/>
-								<option id="com.atollic.truestudio.ldcc.misc.linkerflags.1948405714" superClass="com.atollic.truestudio.ldcc.misc.linkerflags" value="" valueType="string"/>
+								<option id="com.atollic.truestudio.ldcc.libraries.list.848669414" name="Libraries" superClass="com.atollic.truestudio.ldcc.libraries.list"/>
+								<option id="com.atollic.truestudio.ldcc.libraries.searchpath.1273009461" name="Library search path" superClass="com.atollic.truestudio.ldcc.libraries.searchpath"/>
+								<option id="com.atollic.truestudio.ldcc.misc.linkerflags.1948405714" name="Other options" superClass="com.atollic.truestudio.ldcc.misc.linkerflags" value="" valueType="string"/>
 								<option id="com.atollic.truestudio.common_options.target.fpu.829683864" name="Floating point" superClass="com.atollic.truestudio.common_options.target.fpu" value="com.atollic.truestudio.common_options.target.fpu.soft" valueType="enumerated"/>
 								<option id="com.atollic.truestudio.common_options.target.fpucore.1297069055" name="FPU" superClass="com.atollic.truestudio.common_options.target.fpucore" value="com.atollic.truestudio.common_options.target.fpucore.None" valueType="enumerated"/>
 							</tool>
@@ -269,7 +269,14 @@
 	<storageModule moduleId="cdtBuildSystem" version="4.0.0">
 		<project id="EPROMEmu.com.atollic.truestudio.exe.1549124020" name="Executable" projectType="com.atollic.truestudio.exe"/>
 	</storageModule>
-	<storageModule moduleId="refreshScope"/>
+	<storageModule moduleId="refreshScope" versionNumber="2">
+		<configuration configurationName="Debug">
+			<resource resourceType="PROJECT" workspacePath="/EPROMEmu"/>
+		</configuration>
+		<configuration configurationName="Release">
+			<resource resourceType="PROJECT" workspacePath="/EPROMEmu"/>
+		</configuration>
+	</storageModule>
 	<storageModule moduleId="scannerConfiguration">
 		<autodiscovery enabled="true" problemReportingEnabled="true" selectedProfileId=""/>
 		<profile id="org.eclipse.cdt.make.core.GCCStandardMakePerFileProfile">
@@ -310,4 +317,5 @@
 		</scannerConfigBuildInfo>
 	</storageModule>
 	<storageModule moduleId="org.eclipse.cdt.core.LanguageSettingsProviders"/>
+	<storageModule moduleId="org.eclipse.cdt.make.core.buildtargets"/>
 </cproject>
diff --git a/EPROMEmu.elf.launch b/EPROMEmu.elf.launch
index c52f21c..e874eb2 100644
--- a/EPROMEmu.elf.launch
+++ b/EPROMEmu.elf.launch
@@ -1,46 +1,56 @@
-<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <launchConfiguration type="com.atollic.hardwaredebug.launch.launchConfigurationType">
-<stringAttribute key="com.atollic.hardwaredebug.jlink_common.cpu_core" value="Cortex-M" />
-<stringAttribute key="com.atollic.hardwaredebug.jlink_common.device" value="STM32F030RC" />
-<stringAttribute key="com.atollic.hardwaredebug.jlink_common.endian" value="little" />
-<stringAttribute key="com.atollic.hardwaredebug.jlink_common.init_speed" value="4000" />
-<booleanAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_auto" value="true" />
-<intAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_irpre" value="0" />
-<intAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_pos" value="0" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.analyzeCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#xD;&#xA;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#xD;&#xA;monitor flash set_parallelism_mode 2&#xD;&#xA;&#xD;&#xA;# Load the program executable&#xD;&#xA;load&#x9;&#x9;&#xD;&#xA;&#xD;&#xA;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#xD;&#xA;set *0xE0042004 = (*0xE0042004) | 0x7&#xD;&#xA;# Start the executable&#xD;&#xA;continue" />
-<booleanAttribute key="com.atollic.hardwaredebug.launch.enable_swv" value="false" />
-<intAttribute key="com.atollic.hardwaredebug.launch.formatVersion" value="2" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.ipAddress" value="localhost" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.jtagDevice" value="ST-LINK" />
-<intAttribute key="com.atollic.hardwaredebug.launch.portNumber" value="61234" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.remoteCommand" value="target extended-remote" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.runCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#xD;&#xA;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#xD;&#xA;monitor flash set_parallelism_mode 2&#xD;&#xA;&#xD;&#xA;# Load the program executable&#xD;&#xA;load&#x9;&#x9;&#xD;&#xA;&#xD;&#xA;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#xD;&#xA;set *0xE0042004 = (*0xE0042004) | 0x7&#xD;&#xA;# Set a breakpoint at main().&#xD;&#xA;tbreak main&#xD;&#xA;&#xD;&#xA;# Run to the breakpoint.&#xD;&#xA;continue" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.serverParam" value="-p 61234 -l 1 -d" />
-<booleanAttribute key="com.atollic.hardwaredebug.launch.startServer" value="true" />
-<booleanAttribute key="com.atollic.hardwaredebug.launch.swd_mode" value="true" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.swv_port" value="61235" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.swv_trace_div" value="120" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.swv_trace_hclk" value="120000000" />
-<booleanAttribute key="com.atollic.hardwaredebug.launch.swv_wait_for_sync" value="true" />
-<booleanAttribute key="com.atollic.hardwaredebug.launch.useRemoteTarget" value="true" />
-<stringAttribute key="com.atollic.hardwaredebug.launch.verifyCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#xD;&#xA;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#xD;&#xA;monitor flash set_parallelism_mode 2&#xD;&#xA;&#xD;&#xA;# Load the program executable&#xD;&#xA;load&#x9;&#x9;&#xD;&#xA;&#xD;&#xA;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#xD;&#xA;set *0xE0042004 = (*0xE0042004) | 0x7&#xD;&#xA;# The executable starts automatically" />
-<booleanAttribute key="com.atollic.hardwaredebug.stlink.enable_logging" value="false" />
-<stringAttribute key="com.atollic.hardwaredebug.stlink.log_file" value="D:/Dev/Code/STM32/EPROMEmu/\Debug\st-link_gdbserver_log.txt" />
-<booleanAttribute key="com.atollic.hardwaredebug.stlink.verify_flash" value="false" />
-<stringAttribute key="org.eclipse.cdt.debug.mi.core.DEBUG_NAME" value="${TOOLCHAIN_PATH}/arm-atollic-eabi-gdb" />
-<stringAttribute key="org.eclipse.cdt.debug.mi.core.commandFactory" value="Standard (Windows)" />
-<stringAttribute key="org.eclipse.cdt.debug.mi.core.protocol" value="mi" />
-<booleanAttribute key="org.eclipse.cdt.debug.mi.core.verboseMode" value="false" />
-<stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="${TOOLCHAIN_PATH}/arm-atollic-eabi-gdb" />
-<intAttribute key="org.eclipse.cdt.launch.ATTR_BUILD_BEFORE_LAUNCH_ATTR" value="2" />
-<stringAttribute key="org.eclipse.cdt.launch.PROGRAM_NAME" value="Debug/EPROMEmu.elf" />
-<stringAttribute key="org.eclipse.cdt.launch.PROJECT_ATTR" value="EPROMEmu" />
-<stringAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_ID_ATTR" value="" />
+<stringAttribute key="com.atollic.hardwaredebug.jlink_common.cpu_core" value="Cortex-M"/>
+<stringAttribute key="com.atollic.hardwaredebug.jlink_common.device" value="STM32F030RC"/>
+<stringAttribute key="com.atollic.hardwaredebug.jlink_common.endian" value="little"/>
+<stringAttribute key="com.atollic.hardwaredebug.jlink_common.init_speed" value="4000"/>
+<booleanAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_auto" value="true"/>
+<intAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_irpre" value="0"/>
+<intAttribute key="com.atollic.hardwaredebug.jlink_common.scan_chain_pos" value="0"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.analyzeCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#13;&#10;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#13;&#10;monitor flash set_parallelism_mode 2&#13;&#10;&#13;&#10;# Load the program executable&#13;&#10;load&#9;&#9;&#13;&#10;&#13;&#10;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#13;&#10;set *0xE0042004 = (*0xE0042004) | 0x7&#13;&#10;# Start the executable&#13;&#10;continue"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.enable_swv" value="false"/>
+<intAttribute key="com.atollic.hardwaredebug.launch.formatVersion" value="2"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.hwinitCommands" value="# Initialize your hardware here&#10;"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.ipAddress" value="localhost"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.jtagDevice" value="ST-LINK"/>
+<intAttribute key="com.atollic.hardwaredebug.launch.portNumber" value="61234"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.remoteCommand" value="target extended-remote"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.runCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#13;&#10;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#13;&#10;monitor flash set_parallelism_mode 2&#13;&#10;&#13;&#10;# Load the program executable&#13;&#10;load&#9;&#9;&#13;&#10;&#13;&#10;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#13;&#10;set *0xE0042004 = (*0xE0042004) | 0x7&#13;&#10;# Set a breakpoint at main().&#13;&#10;tbreak main&#13;&#10;&#13;&#10;# Run to the breakpoint.&#13;&#10;continue"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.serverParam" value="-p 61234 -l 1 -d -s -cp &quot;C:\Program Files (x86)\Atollic\TrueSTUDIO for STM32 9.3.0\Servers\STM32CubeProgrammer\bin&quot;"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.startServer" value="true"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.swd_mode" value="true"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.swv_port" value="61235"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.swv_trace_div" value="120"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.swv_trace_hclk" value="120000000"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.swv_wait_for_sync" value="true"/>
+<intAttribute key="com.atollic.hardwaredebug.launch.trace_system" value="0"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.useRemoteTarget" value="true"/>
+<stringAttribute key="com.atollic.hardwaredebug.launch.verifyCommands" value="# Set flash parallelism mode to 32, 16, or 8 bit when using STM32 F2/F4 microcontrollers&#13;&#10;# 2=32 bit, 1=16 bit and 0=8 bit parallelism mode&#13;&#10;monitor flash set_parallelism_mode 2&#13;&#10;&#13;&#10;# Load the program executable&#13;&#10;load&#9;&#9;&#13;&#10;&#13;&#10;# Enable Debug connection in low power modes (DBGMCU-&gt;CR)&#13;&#10;set *0xE0042004 = (*0xE0042004) | 0x7&#13;&#10;# The executable starts automatically"/>
+<booleanAttribute key="com.atollic.hardwaredebug.launch.verify_flash_download" value="true"/>
+<booleanAttribute key="com.atollic.hardwaredebug.stlink.enable_external_loader" value="false"/>
+<booleanAttribute key="com.atollic.hardwaredebug.stlink.enable_logging" value="false"/>
+<stringAttribute key="com.atollic.hardwaredebug.stlink.external_loader" value=""/>
+<stringAttribute key="com.atollic.hardwaredebug.stlink.log_file" value="D:/Dev/Code/STM32/EPROMEmu/\Debug\st-link_gdbserver_log.txt"/>
+<booleanAttribute key="com.atollic.hardwaredebug.stlink.stlink_check_serial_number" value="false"/>
+<stringAttribute key="com.atollic.hardwaredebug.stlink.stlink_txt_serial_number" value=""/>
+<booleanAttribute key="com.atollic.hardwaredebug.stlink.verify_flash" value="false"/>
+<stringAttribute key="org.eclipse.cdt.debug.mi.core.DEBUG_NAME" value="${TOOLCHAIN_PATH}/arm-atollic-eabi-gdb"/>
+<stringAttribute key="org.eclipse.cdt.debug.mi.core.commandFactory" value="Standard (Windows)"/>
+<stringAttribute key="org.eclipse.cdt.debug.mi.core.protocol" value="mi"/>
+<booleanAttribute key="org.eclipse.cdt.debug.mi.core.verboseMode" value="false"/>
+<stringAttribute key="org.eclipse.cdt.dsf.gdb.DEBUG_NAME" value="${TOOLCHAIN_PATH}/arm-atollic-eabi-gdb"/>
+<intAttribute key="org.eclipse.cdt.launch.ATTR_BUILD_BEFORE_LAUNCH_ATTR" value="2"/>
+<stringAttribute key="org.eclipse.cdt.launch.DEBUGGER_REGISTER_GROUPS" value=""/>
+<stringAttribute key="org.eclipse.cdt.launch.PROGRAM_NAME" value="Debug/EPROMEmu.elf"/>
+<stringAttribute key="org.eclipse.cdt.launch.PROJECT_ATTR" value="EPROMEmu"/>
+<booleanAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_AUTO_ATTR" value="false"/>
+<stringAttribute key="org.eclipse.cdt.launch.PROJECT_BUILD_CONFIG_ID_ATTR" value=""/>
 <listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_PATHS">
-<listEntry value="/EPROMEmu" />
+<listEntry value="/EPROMEmu"/>
 </listAttribute>
 <listAttribute key="org.eclipse.debug.core.MAPPED_RESOURCE_TYPES">
-<listEntry value="4" />
+<listEntry value="4"/>
 </listAttribute>
-<stringAttribute key="org.eclipse.dsf.launch.MEMORY_BLOCKS" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#xD;&#xA;&lt;memoryBlockExpressionList context=&quot;reserved-for-future-use&quot;/&gt;&#xD;&#xA;" />
+<stringAttribute key="org.eclipse.dsf.launch.MEMORY_BLOCKS" value="&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; standalone=&quot;no&quot;?&gt;&#13;&#10;&lt;memoryBlockExpressionList context=&quot;reserved-for-future-use&quot;/&gt;&#13;&#10;"/>
+<stringAttribute key="process_factory_id" value="org.eclipse.cdt.dsf.gdb.GdbProcessFactory"/>
 </launchConfiguration>
diff --git a/Inc/commands.h b/Inc/commands.h
new file mode 100644
index 0000000..7d00e3d
--- /dev/null
+++ b/Inc/commands.h
@@ -0,0 +1,27 @@
+#ifndef DECODECOMMANDS_H
+#define DECODECOMMANDS_H
+
+#include "stm32f0xx_system.h"
+
+enum CommsErrors
+{
+	CMD_NO_ERROR 		=  0,
+	CMD_NOT_KNOWN 		= -1,
+	CMD_BUSY			= -2,
+	CMD_PARAM_ERROR		= -3,
+	CMD_RANGE_ERROR 	= -4
+};
+
+#define MAX_BUFFER_LENGTH 255
+
+typedef struct
+{
+	char *command;				// Two character command code
+	int16_t (*function_ptr)();  // Pointer to command function
+	char *desc;					// Pointer to description string for help
+} command_entry_t;
+
+void decode_command(char* commandStr);
+
+#endif
+
diff --git a/Inc/gpio.h b/Inc/gpio.h
index 135c73d..c6e04bf 100644
--- a/Inc/gpio.h
+++ b/Inc/gpio.h
@@ -5,4 +5,7 @@
 
 void initialise_gpio(void);
 
+void set_target_reset_state(uint8_t state);
+uint8_t read_target_vcc(void);
+
 #endif
diff --git a/Inc/shiftregister.h b/Inc/shiftregister.h
new file mode 100644
index 0000000..524dfc2
--- /dev/null
+++ b/Inc/shiftregister.h
@@ -0,0 +1,18 @@
+#ifndef _SHIFTREGISTER_H_
+#define _SHIFTREGISTER_H_
+
+#include "stm32f0xx_system.h"
+
+//Global Variables
+extern uint32_t g_output_shift_data;
+extern uint32_t g_input_shift_data;
+
+
+void init_shift_registers(void);
+uint32_t update_shift_registers();
+
+void enableShiftRegisters(void);
+void disableShiftRegisters(void);
+
+
+#endif
diff --git a/Inc/timers.h b/Inc/timers.h
index c43d657..af5aa87 100644
--- a/Inc/timers.h
+++ b/Inc/timers.h
@@ -4,4 +4,6 @@
 #include "stm32f0xx_system.h"
 
 
+extern uint32_t g_time;
+
 #endif
diff --git a/Inc/usart.h b/Inc/usart.h
index dbb632a..425e805 100644
--- a/Inc/usart.h
+++ b/Inc/usart.h
@@ -3,4 +3,50 @@
 
 #include "stm32f0xx_system.h"
 
+// Buffer sizes. Buffer size must be a power of 2
+#define RXBUF_SIZE		512
+#define TXBUF_SIZE		256
+
+#if RXBUF_SIZE < 2
+#error RXBUF_SIZE is too small.  It must be larger than 1.
+#elif ((RXBUF_SIZE & (RXBUF_SIZE-1)) != 0)
+#error RXBUF_SIZE must be a power of 2.
+#endif
+
+ #if TXBUF_SIZE < 2
+#error TXBUF_SIZE is too small.  It must be larger than 1.
+#elif ((TXBUF_SIZE & (TXBUF_SIZE-1)) != 0)
+#error TXBUF_SIZE must be a power of 2.
+#endif
+
+
+
+typedef struct
+{
+	uint8_t 			*buf;
+	volatile uint16_t 	head;
+	volatile uint16_t 	tail;
+	volatile uint16_t 	count;
+	volatile uint16_t 	size;
+	uint16_t			mask;
+} ringbuffer_t;
+
+extern ringbuffer_t g_rx_buf;
+extern ringbuffer_t g_tx_buf;
+volatile extern uint8_t g_tx_sending;
+
+// Function prototypes
+void init_uart(void);
+
+void ring_buf_init(ringbuffer_t *buf, uint8_t *bufData, uint16_t size);
+uint8_t ring_buf_get(ringbuffer_t *buf);
+void ring_buf_put(ringbuffer_t *buf, const uint8_t c);
+void ring_buf_wait_full(ringbuffer_t *buf);
+uint8_t is_ring_buf_full(ringbuffer_t *buf);
+uint8_t is_ring_buf_empty(ringbuffer_t *buf);
+
+char get_line(char *lineBuf, uint16_t maxChars);
+
+void USART1_IRQHandler(void);
+
 #endif
diff --git a/Src/commands.c b/Src/commands.c
new file mode 100644
index 0000000..fe6d05a
--- /dev/null
+++ b/Src/commands.c
@@ -0,0 +1,116 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "commands.h"
+#include "gpio.h"
+
+extern const char *firmware_version;
+
+int16_t cmd_print_help(void);
+int16_t cmd_print_version(void);
+int16_t cmd_reset_state(char *params);
+
+const command_entry_t g_command_tab[] =
+{
+	{"??", cmd_print_help, "Displays this help with a list of available commands"},
+	{":S", cmd_reset_state, "Sets the reset state of the target board, params 0 or 1"},
+	{":V", cmd_print_version, "Displays the version number"}
+};
+
+// Number of commands in the Command Table
+const uint16_t g_number_commands = sizeof(g_command_tab) / sizeof(command_entry_t);
+
+// This allows commands from RS232 interface to control the board, format given above.
+void decode_command(char* commandStr)
+{
+	char tempCommand[3] = {0};
+  	char *paramPtr;
+
+  	// Convert command string to upper case
+  	strupr(commandStr);
+
+	// skip whitespace characters
+	while (isspace(*commandStr) && (*commandStr != '\0'))
+		commandStr++;
+
+	if (*commandStr == '\0')
+	{
+		// no command found on
+    	printf("%d\n", CMD_NOT_KNOWN);
+		return;
+	}
+
+	// command found search for parameter string
+	paramPtr = commandStr + 2;
+
+	// skip whitespace characters
+	while (isspace(*paramPtr) && (*paramPtr != '\0'))
+		paramPtr++;
+
+	// set parameter pointer to zero if no parameter found on line
+	if (*paramPtr == '\0')
+		paramPtr = 0;
+
+	// copy 1st 2 characters of command string into tempCommand
+	tempCommand[0] = commandStr[0];
+	tempCommand[1] = commandStr[1];
+
+	// search for valid command
+	for (int cmd = 0; cmd < g_number_commands; cmd++)
+	{
+		if (strcmp(tempCommand, g_command_tab[cmd].command) == 0)
+		{
+			// jump to matching command and save error code from command handler
+			int tmpErr = (*g_command_tab[cmd].function_ptr)(paramPtr);
+
+			if (tmpErr != CMD_NO_ERROR)
+				printf("%d\n", tmpErr);
+
+			return;
+		}
+	}
+
+	// here if no commands matched
+	printf("%d\n", CMD_NOT_KNOWN);
+}
+
+int16_t cmd_print_help()
+{
+	printf("Commands available:\n");
+
+	// Print the command code and the description for each command in the table
+	for (uint16_t i = 0; i < g_number_commands; i++)
+	{
+		if (g_command_tab[i].command != NULL)
+			printf("\t%s - %s\n", g_command_tab[i].command, g_command_tab[i].desc);
+		else
+			printf("%s\n", g_command_tab[i].desc);
+
+	}
+	return CMD_NO_ERROR;
+}
+
+int16_t cmd_print_version()
+{
+	printf("%d\nEPROM Emulator firmware version: %s\n", CMD_NO_ERROR, firmware_version);
+	return CMD_NO_ERROR;
+}
+
+int16_t cmd_reset_state(char *params)
+{
+	int state;
+
+	int numParams = sscanf(params, "%d", &state);
+
+	if (numParams != 1)
+	{
+		printf("%d\n", CMD_PARAM_ERROR);
+		return CMD_PARAM_ERROR;
+	}
+
+	set_target_reset_state((uint8_t)state);
+
+	printf("%d\n", CMD_NO_ERROR);
+	return CMD_NO_ERROR;
+}
diff --git a/Src/gpio.c b/Src/gpio.c
index 7249b3a..039feda 100644
--- a/Src/gpio.c
+++ b/Src/gpio.c
@@ -4,6 +4,15 @@ void initialise_gpio(void)
 {
 	MX_GPIO_Init();
 	MX_ADC_Init();
-	MX_USART1_UART_Init();
 	MX_TIM6_Init();
 }
+
+void set_target_reset_state(uint8_t state)
+{
+	HAL_GPIO_WritePin(BOARD_RESET_GPIO_Port, BOARD_RESET_Pin, state);
+}
+
+uint8_t read_target_vcc(void)
+{
+	(uint8_t)HAL_GPIO_ReadPin(BOARD_POWER_GPIO_Port, BOARD_POWER_Pin);
+}
diff --git a/Src/main.c b/Src/main.c
index 7f71873..705b130 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -3,19 +3,33 @@
 #include "adc.h"
 #include "usart.h"
 #include "gpio.h"
+#include "shiftregister.h"
+#include "commands.h"
+
+#include <stdlib.h>
+
+const char *firmware_version = "v0.1";
+
+char line_buf[MAX_BUFFER_LENGTH];
 
 int main(void)
 {
-	// Reset of all peripherals, Initializes the Flash interface and the Systick.
+	// Reset of all peripherals, Initialises the Flash interface and the Systick.
 	HAL_Init();
 
 	// Configure the system clock
 	SystemClock_Config();
 
-	// Initialize all configured peripherals */
+	// Initialise all configured peripherals
 	initialise_gpio();
+	init_uart();
+	init_shift_registers();
 
 	while (1)
 	{
+		if (get_line(line_buf, sizeof(line_buf)))
+		{
+			decode_command(line_buf);
+		}
 	}
 }
diff --git a/Src/shiftregister.c b/Src/shiftregister.c
new file mode 100644
index 0000000..58d9394
--- /dev/null
+++ b/Src/shiftregister.c
@@ -0,0 +1,99 @@
+#include "shiftregister.h"
+
+//Global Variables
+uint32_t g_output_shift_data = 0;		//!< Data to be written to the shift register outputs
+uint32_t g_input_shift_data = 0;		//!< Data read back from the shift register inputs
+
+
+void set_sr_clock(uint8_t state)
+{
+	HAL_GPIO_WritePin(SR_CLK_GPIO_Port, SR_CLK_Pin, state);
+}
+
+void set_sr_latch(uint8_t state)
+{
+	HAL_GPIO_WritePin(SR_STRB_GPIO_Port, SR_STRB_Pin, state);
+}
+
+void set_sr_data_out(uint8_t state)
+{
+	HAL_GPIO_WritePin(SR_DATA_GPIO_Port, SR_DATA_Pin, state);
+}
+
+void set_sr_reset_state(uint8_t state)
+{
+	HAL_GPIO_WritePin(SR_RST_GPIO_Port, SR_RST_Pin, state);
+}
+
+void set_sr_output_state(uint8_t state)
+{
+	HAL_GPIO_WritePin(SR_OE_GPIO_Port, SR_OE_Pin, state);
+}
+
+uint32_t read_sr_data_in(void)
+{
+	// Read a single bit from port pin.
+	return HAL_GPIO_ReadPin(SR_DATAIN_GPIO_Port, SR_DATAIN_Pin);
+}
+
+void init_shift_registers(void)
+{
+	set_sr_latch(1);
+	set_sr_clock(1);
+						 
+	// Set the default value on the shift registers
+	update_shift_registers();
+}
+
+// Updated the outputs on the Shift Register
+uint32_t update_shift_registers(void)
+{
+	uint32_t data_out = 0;
+	uint32_t data_in = 0;
+	uint32_t bit_mask;
+	uint8_t i;
+
+	// Shift Data out
+	data_out = g_output_shift_data;
+	bit_mask = 0x0800;
+
+	for (i = 0; i < 24; i++)
+	{
+		set_sr_clock(0);
+
+		if (data_out & bit_mask)
+			set_sr_data_out(1);
+		else
+			set_sr_data_out(0);
+
+		bit_mask >>= 1;
+		set_sr_clock(1);
+	}
+
+	// Once 16 bits have been loaded in, strobe to send the data to U7/U8 parallel outputs.
+	set_sr_latch(0);
+	set_sr_latch(1);
+	
+
+	// Read the data back in and verify that it's correct.
+	// Data is clocked on negative edge.
+	for (i = 0; i < 24; i++)
+	{
+		set_sr_clock(0);
+		data_in <<= 1;  //Data is shifted in MSB to LSB.
+		data_in |= read_sr_data_in();
+		set_sr_clock(1);
+	}
+
+	set_sr_clock(0);
+
+	// Check if the data read and sent the same
+	if ((data_in & 0x00FFFFFF) != g_output_shift_data)
+	{
+		//setShiftRegError();
+	}
+
+	g_input_shift_data = data_in;
+	return g_input_shift_data;
+}
+
diff --git a/Src/stm32f0xx_hal_msp.c b/Src/stm32f0xx_hal_msp.c
deleted file mode 100644
index 9d575ec..0000000
--- a/Src/stm32f0xx_hal_msp.c
+++ /dev/null
@@ -1,84 +0,0 @@
-/* USER CODE BEGIN Header */
-/**
-  ******************************************************************************
-  * File Name          : stm32f0xx_hal_msp.c
-  * Description        : This file provides code for the MSP Initialization 
-  *                      and de-Initialization codes.
-  ******************************************************************************
-  * @attention
-  *
-  * <h2><center>&copy; Copyright (c) 2019 STMicroelectronics.
-  * All rights reserved.</center></h2>
-  *
-  * This software component is licensed by ST under BSD 3-Clause license,
-  * the "License"; You may not use this file except in compliance with the
-  * License. You may obtain a copy of the License at:
-  *                        opensource.org/licenses/BSD-3-Clause
-  *
-  ******************************************************************************
-  */
-/* USER CODE END Header */
-
-/* Includes ------------------------------------------------------------------*/
-#include <port_definitions.h>
-/* USER CODE BEGIN Includes */
-
-/* USER CODE END Includes */
-
-/* Private typedef -----------------------------------------------------------*/
-/* USER CODE BEGIN TD */
-
-/* USER CODE END TD */
-
-/* Private define ------------------------------------------------------------*/
-/* USER CODE BEGIN Define */
- 
-/* USER CODE END Define */
-
-/* Private macro -------------------------------------------------------------*/
-/* USER CODE BEGIN Macro */
-
-/* USER CODE END Macro */
-
-/* Private variables ---------------------------------------------------------*/
-/* USER CODE BEGIN PV */
-
-/* USER CODE END PV */
-
-/* Private function prototypes -----------------------------------------------*/
-/* USER CODE BEGIN PFP */
-
-/* USER CODE END PFP */
-
-/* External functions --------------------------------------------------------*/
-/* USER CODE BEGIN ExternalFunctions */
-
-/* USER CODE END ExternalFunctions */
-
-/* USER CODE BEGIN 0 */
-
-/* USER CODE END 0 */
-/**
-  * Initializes the Global MSP.
-  */
-void HAL_MspInit(void)
-{
-  /* USER CODE BEGIN MspInit 0 */
-
-  /* USER CODE END MspInit 0 */
-
-  __HAL_RCC_SYSCFG_CLK_ENABLE();
-  __HAL_RCC_PWR_CLK_ENABLE();
-
-  /* System interrupt init*/
-
-  /* USER CODE BEGIN MspInit 1 */
-
-  /* USER CODE END MspInit 1 */
-}
-
-/* USER CODE BEGIN 1 */
-
-/* USER CODE END 1 */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
diff --git a/Src/stm32f0xx_system.c b/Src/stm32f0xx_system.c
index 5ab8968..4197198 100644
--- a/Src/stm32f0xx_system.c
+++ b/Src/stm32f0xx_system.c
@@ -30,6 +30,13 @@ void SysTick_Handler(void)
 	HAL_SYSTICK_IRQHandler();
 }
 
+void HAL_MspInit(void)
+{
+	__HAL_RCC_SYSCFG_CLK_ENABLE();
+	__HAL_RCC_PWR_CLK_ENABLE();
+}
+
+
 void SystemClock_Config(void)
 {
 	RCC_OscInitTypeDef RCC_OscInitStruct = {0};
@@ -37,12 +44,13 @@ void SystemClock_Config(void)
 	RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
 	// Initializes the CPU, AHB and APB busses clocks
-	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI14 | RCC_OSCILLATORTYPE_HSE;
-	RCC_OscInitStruct.HSEState = RCC_HSE_ON;
+	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_HSI14;
+	RCC_OscInitStruct.HSIState = RCC_HSI_ON;
 	RCC_OscInitStruct.HSI14State = RCC_HSI14_ON;
+	RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
 	RCC_OscInitStruct.HSI14CalibrationValue = 16;
 	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
 	RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL6;
 	RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
 
@@ -52,7 +60,7 @@ void SystemClock_Config(void)
 	}
 
 	// Initializes the CPU, AHB and APB busses clocks
-	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1;
+	RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_PCLK1;
 	RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
 	RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
 	RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
@@ -75,7 +83,6 @@ void Error_Handler(void)
 {
 }
 
-
 void MX_ADC_Init(void)
 {
 	ADC_ChannelConfTypeDef sConfig = {0};
@@ -244,7 +251,7 @@ void HAL_TIM_Base_MspDeInit(TIM_HandleTypeDef* tim_baseHandle)
 void MX_USART1_UART_Init(void)
 {
 	huart1.Instance = USART1;
-	huart1.Init.BaudRate = 115200;
+	huart1.Init.BaudRate = 57600; //115200;
 	huart1.Init.WordLength = UART_WORDLENGTH_8B;
 	huart1.Init.StopBits = UART_STOPBITS_1;
 	huart1.Init.Parity = UART_PARITY_NONE;
@@ -279,7 +286,7 @@ void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
 		HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 	    // USART1 interrupt Init
-	    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
+	    HAL_NVIC_SetPriority(USART1_IRQn, 1, 0);
 	    HAL_NVIC_EnableIRQ(USART1_IRQn);
 	}
 }
diff --git a/Src/syscalls.c b/Src/syscalls.c
index 58e635e..fabb3a1 100644
--- a/Src/syscalls.c
+++ b/Src/syscalls.c
@@ -11,7 +11,7 @@
 **
 **  Environment : System Workbench for MCU
 **
-**  Distribution: The file is distributed “as is,” without any warranty
+**  Distribution: The file is distributed as is without any warranty
 **                of any kind.
 **
 *****************************************************************************
@@ -88,7 +88,7 @@ void _exit (int status)
 	while (1) {}		/* Make sure we hang here */
 }
 
-__attribute__((weak)) int _read(int file, char *ptr, int len)
+int _read (int file, char *ptr, int len)
 {
 	int DataIdx;
 
@@ -100,7 +100,8 @@ __attribute__((weak)) int _read(int file, char *ptr, int len)
 return len;
 }
 
-__attribute__((weak)) int _write(int file, char *ptr, int len)
+/*
+int _write(int file, char *ptr, int len)
 {
 	int DataIdx;
 
@@ -110,7 +111,7 @@ __attribute__((weak)) int _write(int file, char *ptr, int len)
 	}
 	return len;
 }
-
+*/
 caddr_t _sbrk(int incr)
 {
 	extern char end asm("end");
diff --git a/Src/timers.c b/Src/timers.c
index 58aa4e0..8d66d03 100644
--- a/Src/timers.c
+++ b/Src/timers.c
@@ -1,6 +1,10 @@
 #include "timers.h"
 
+uint32_t g_time = 0;
+
 void TIM6_IRQHandler(void)
 {
+	g_time++;
+
 	HAL_TIM_IRQHandler(&htim6);
 }
diff --git a/Src/usart.c b/Src/usart.c
index d79066c..40193a1 100644
--- a/Src/usart.c
+++ b/Src/usart.c
@@ -1,6 +1,217 @@
 #include "usart.h"
 
+// Defines
+#define DEL        0x7F
+#define BACKSPACE  0x08
+#define CR         0x0D
+#define LF         0x0A
+
+// Global variables
+ringbuffer_t g_rx_buf = { 0 };
+ringbuffer_t g_tx_buf = { 0 };
+volatile uint8_t g_tx_sending = 0;
+uint8_t g_echo_serial = 1;
+
+uint8_t g_rx_buffer_data[RXBUF_SIZE];
+uint8_t g_tx_buffer_data[TXBUF_SIZE];
+
+
+void init_uart(void)
+{
+	MX_USART1_UART_Init();
+
+	// Initialise the RX and TX buffers
+	ring_buf_init(&g_rx_buf, g_rx_buffer_data, RXBUF_SIZE);
+	ring_buf_init(&g_tx_buf, g_tx_buffer_data, TXBUF_SIZE);
+
+	// Clear Overrun flag, in case characters have already been sent to USART
+	USART1->ICR = USART_ICR_ORECF;
+
+	// Enable RXNE interrupt
+	USART1->CR1 |= USART_CR1_RXNEIE;
+}
+
+void ring_buf_init(ringbuffer_t *buf, uint8_t *bufData, uint16_t size)
+{
+	buf->buf = bufData;
+	buf->head = 0;
+	buf->tail = 0;
+	buf->count = 0;
+	buf->size = size;
+	buf->mask = size - 1;
+}
+
+void ring_buf_wait_full(ringbuffer_t *buf)
+{
+	while (is_ring_buf_full(buf))
+	{
+		if (!g_tx_sending)
+		{
+			g_tx_sending = 1;
+			USART1->CR1 |= USART_CR1_TXEIE;		// Enable the TX empty interrupt
+		}
+	}
+}
+
+
+uint8_t ring_buf_get(ringbuffer_t *buf)
+{
+	if (!buf->buf)
+		return 0;
+
+	uint8_t ret = buf->buf[buf->tail];
+	buf->tail = (buf->tail + 1) & buf->mask;
+	buf->count--;
+
+	return ret;
+}
+
+void ring_buf_put(ringbuffer_t *buf, const uint8_t c)
+{
+	if (!buf->buf)
+		return;
+
+	buf->buf[buf->head] = c;
+	// increment the head index
+	buf->head = (buf->head + 1) & buf->mask;
+	buf->count++;
+}
+
+inline uint8_t is_ring_buf_full(ringbuffer_t *buf)
+{
+	return ((buf->head - buf->tail) & buf->mask) == buf->mask;
+}
+
+inline uint8_t is_ring_buf_empty(ringbuffer_t *buf)
+{
+	return (buf->tail == buf->head);
+}
+
+int __io_putchar(int ch)
+{
+	if (ch == '\n')
+	{
+		ring_buf_wait_full(&g_tx_buf);
+    	ring_buf_put(&g_tx_buf, '\r');
+	}
+
+	ring_buf_wait_full(&g_tx_buf);
+	ring_buf_put(&g_tx_buf, ch);
+
+	if (!g_tx_sending)
+	{
+		g_tx_sending = 1;
+		USART1->CR1 |= USART_CR1_TXEIE;		// Enable the TX empty interrupt
+	}
+
+	return ch;
+}
+
+int _write(int file, char *ptr, int len)
+{
+	for (int i= 0; i < len; i++)
+	   __io_putchar( *ptr++ );
+
+	return len;
+}
+
+char get_line(char *lineBuf, uint16_t maxChars)
+{
+	static int count = 0;
+	char res = 0;
+
+	if (g_rx_buf.count == 0)
+		return 0;
+
+  	if (count < maxChars - 1)
+	{
+		uint8_t c = ring_buf_get(&g_rx_buf);
+
+		if (c == CR)
+			c = LF;    						// Read character
+
+    	if (c == BACKSPACE || c == DEL)  	// Process backspace
+		{
+      		if (count != 0)
+			{
+        		count--;
+				if (g_echo_serial)
+				{
+					__io_putchar(0x08);			// Send Backspace and erase previous character
+					__io_putchar(' ');
+					__io_putchar(0x08);
+				}
+      		}
+    	}
+       	else
+		{
+			if (g_echo_serial)
+			{
+				__io_putchar(c);
+			}
+			lineBuf[count] = c;					// store character
+			count++;
+		}
+
+		if (c == LF)
+		{
+			lineBuf[count] = 0;
+			res = 1;
+			count = 0;
+		}
+  	}
+  	else
+  	{
+  		// return the string without waiting for the CR if the line is too long
+  		lineBuf[count] = 0;
+		count = 0;
+  		return 1;
+  	}
+
+	return res;
+}
+
 void USART1_IRQHandler(void)
 {
-	HAL_UART_IRQHandler(&huart1);
+	// Check Receive Not Empty interrupt enabled and active
+	if ((USART1->CR1 & USART_CR1_RXNEIE) && (USART1->ISR & USART_ISR_RXNE))
+	{
+		// Read the character from the serial port
+		uint8_t c = (uint8_t)(USART1->RDR);
+
+		// If the buffer is not full add the character otherwise it will be discarded
+		if (!is_ring_buf_full(&g_rx_buf))
+		{
+			ring_buf_put(&g_rx_buf, c);
+		}
+	}
+
+	// Check Transmit Empty interrupt enabled and active
+	if ((USART1->CR1 & USART_CR1_TXEIE) && (USART1->ISR & USART_ISR_TXE))
+	{
+		// Send the next character
+		if (!is_ring_buf_empty(&g_tx_buf))
+		{
+			USART1->TDR = ring_buf_get(&g_tx_buf);
+		}
+		else
+		{
+
+			USART1->CR1 &= ~USART_CR1_TXEIE;	// Disable the TXE interrupt
+			USART1->CR1 |= USART_CR1_TCIE;		// Enable the TC interrupt
+			g_tx_sending = 0;
+		}
+	}
+
+	// Check Transmission Complete interrupt enabled and active
+	if ((USART1->CR1 & USART_CR1_TCIE) && (USART1->ISR, USART_ISR_TC))
+	{
+		USART1->ICR = USART_ICR_TCCF;			// Clear the TC flag
+
+		if (g_tx_buf.count == 0)
+		{
+			USART1->CR1 &= ~USART_CR1_TCIE;		// Disable the TC interrupt
+			g_tx_sending = 0;
+		}
+	}
 }