AVR: Add missing readme.txt file in demos folders.

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@10723 35acf78f-673a-0410-8e92-d51de3d6d3f4

demos/AVR/NIL-ARDUINO-MEGA/readme.txt

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+*****************************************************************************
+** ChibiOS/NIL port for Atmel AVR ATmega2560.                              **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Arduino Mega board.
+
+** The Demo **
+
+One thread prints a message to the serial console, which is available on
+the board USB connector (FT232 converter).
+
+Another thread toggles the LED on PB7 (pin 13 on Arduino IDE) every 500ms.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain. It should build with WinAVR too!
+
+** Notes **
+
+This demo runs natively so the Arduino bootloader must be removed and the FUSEs
+reprogrammed. The values used for fuses are LFUSE=0xe7 and HFUSE=0x99.

demos/AVR/NIL-ARDUINO-MINI/readme.txt

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+*****************************************************************************
+** ChibiOS/NIL port for Atmel AVR ATmega328p.                              **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Arduino Mini board.
+
+** The Demo **
+
+One thread prints a message to the serial console, which is available on
+the board USB connector (FT232 converter).
+
+Another thread toggles the LED on PB5 (pin 13 on Arduino IDE) every 500ms.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain.

demos/AVR/NIL-ARDUINO-NANO/readme.txt

@@ -0,0 +1,18 @@
+*****************************************************************************
+** ChibiOS/NIL port for Atmel AVR ATmega328p.                              **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Arduino Nano board.
+
+** The Demo **
+
+One thread prints a message to the serial console, which is available on
+the board USB connector (FT232 converter).
+
+Another thread toggles the LED on PB5 (pin 13 on Arduino IDE) every 500ms.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain.

demos/AVR/NIL-ARDUINO-UNO/readme.txt

@@ -0,0 +1,18 @@
+*****************************************************************************
+** ChibiOS/NIL port for Atmel AVR ATmega328p.                              **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Arduino Uno board.
+
+** The Demo **
+
+One thread prints a message to the serial console, which is available on
+the board USB connector (FT232 converter).
+
+Another thread toggles the LED on PB5 (pin 13 on Arduino IDE) every 500ms.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain.

demos/AVR/NIL-MT-DB-X4/readme.txt

@@ -0,0 +1,20 @@
+*****************************************************************************
+** ChibiOS/NIL port for ATxmega128a4u.                                     **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on the mattair Tech MT-DB-X4 board.
+
+** The Demo **
+
+The demo show how to blink the onboard LED every second by using a threas.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain. It should build with WinAVR too!
+
+** Programming procedure **
+
+The board can be flash by using the Makefile and the DFU Programmer tools.
+See the make file for more details.

demos/AVR/RT-MT-DB-X4/readme.txt

@@ -0,0 +1,20 @@
+*****************************************************************************
+** ChibiOS/RT port for ATxmega128a4u.                                      **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on the mattair Tech MT-DB-X4 board.
+
+** The Demo **
+
+The demo show how to blink the onboard LED every second.
+
+** Build Procedure **
+
+The demo was built using the GCC AVR toolchain. It should build with WinAVR too!
+
+** Programming procedure **
+
+The board can be flash by using the Makefile and the DFU Programmer tools.
+See the make file for more details.