From acf699ad9f93351c4482e6f85bc3e63aa10b96f4 Mon Sep 17 00:00:00 2001
From: rusefi <arro239+rusefi@gmail.com>
Date: Tue, 4 Apr 2017 22:00:54 -0400
Subject: [PATCH] works with FPU=no

---
 demos/STM32/RT-STM32F407-DISCOVERY-MEMS/chconf.h  | 2 ++
 demos/STM32/RT-STM32F407-DISCOVERY-MEMS/flash.bat | 1 +
 demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main.c    | 5 +++++
 3 files changed, 8 insertions(+)
 create mode 100644 demos/STM32/RT-STM32F407-DISCOVERY-MEMS/flash.bat

diff --git a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/chconf.h b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/chconf.h
index 7d9906294..eb5e70fc9 100644
--- a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/chconf.h
+++ b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/chconf.h
@@ -28,6 +28,8 @@
 #ifndef _CHCONF_H_
 #define _CHCONF_H_
 
+#define CHPRINTF_USE_FLOAT          	TRUE
+
 /*===========================================================================*/
 /**
  * @name System timers settings
diff --git a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/flash.bat b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/flash.bat
new file mode 100644
index 000000000..be3cb0f51
--- /dev/null
+++ b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/flash.bat
@@ -0,0 +1 @@
+st-link_cli -c SWD ur -P build\ch.hex -Rst -Run
diff --git a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main.c b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main.c
index 1c02f91f7..0c15959e8 100644
--- a/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main.c
+++ b/demos/STM32/RT-STM32F407-DISCOVERY-MEMS/main.c
@@ -45,6 +45,10 @@ static void cmd_mem(BaseSequentialStream *chp, int argc, char *argv[]) {
   chprintf(chp, "heap free total  : %u bytes\r\n", size);
 }
 
+static void cmd_log(BaseSequentialStream *chp, int argc, char *argv[]) {
+    chprintf(chp, "log(18000)=%f\r\n", logf(18000));
+}
+
 static void cmd_threads(BaseSequentialStream *chp, int argc, char *argv[]) {
   static const char *states[] = {CH_STATE_NAMES};
   thread_t *tp;
@@ -83,6 +87,7 @@ static void cmd_test(BaseSequentialStream *chp, int argc, char *argv[]) {
 }
 
 static const ShellCommand commands[] = {
+  {"log", cmd_log},
   {"mem", cmd_mem},
   {"threads", cmd_threads},
   {"test", cmd_test},