[AVR] Add ICU test (RT-only)

git-svn-id: svn://svn.code.sf.net/p/chibios/svn/trunk@7052 35acf78f-673a-0410-8e92-d51de3d6d3f4

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diff --git a/testhal/AVR/ICU/readme.txt b/testhal/AVR/ICU/readme.txt
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+*****************************************************************************

+** ChibiOS/RT port for Atmel AVR ATmega1280.                                **

+*****************************************************************************

+

+** TARGET **

+

+The demo runs on an Arduino Mega board.

+

+** The Demo **

+

+This demo uses ICP3 (ICU3 input) which is located on pin PE7 to measure signal

+width and period. The signal is output on pin PD4 using standard PAL calls and

+thread sleep functions. PD4 must be wired to PE7. It outputs three different

+waveforms with aproximately 1s duration using 50%, 25% and 75% respective duty

+cycles. After that it just turns on ICU3 and waits for it to overflow. The values

+read on each of these operations is output to SERIAL1.

+

+** 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.