ChibiOS 2.6.8, until I can figure out where to get it from git.

firmware/chibios/testhal/STM32F1xx/PWM-ICU/readme.txt

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+*****************************************************************************
+** ChibiOS/RT HAL - PWM/ICU driver demo for STM32.                         **
+*****************************************************************************
+
+** TARGET **
+
+The demo runs on an Olimex STM32-P103 board.
+
+** The Demo **
+
+The application demonstrates the use of the STM32 PWM and ICU drivers. Pins
+PA8 and PB6 must be connected in order to trigger the ICU input with the
+PWM output. The ICU unit will measure the generated PWM.
+
+** Build Procedure **
+
+The demo has been tested using the free Codesourcery GCC-based toolchain
+and YAGARTO.
+Just modify the TRGT line in the makefile in order to use different GCC ports.
+
+** Notes **
+
+Some files used by the demo are not part of ChibiOS/RT but are copyright of
+ST Microelectronics and are licensed under a different license.
+Also note that not all the files present in the ST library are distributed
+with ChibiOS/RT, you can find the whole library on the ST web site:
+
+                             http://www.st.com