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STM32: new config parameter UAVCAN_STM32_TIMX_INPUT_CLOCK

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This commit is contained in:
Pavel Kirienko
2017-11-27 13:48:33 +02:00
parent 2d0225886d
commit e2c68bea6a
1 changed files with 16 additions and 3 deletions
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libuavcan_drivers/stm32/driver/src/uc_stm32_clock.cpp
+16 -3
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@@ -46,8 +46,21 @@
# error "This UAVCAN_STM32_TIMER_NUMBER is not supported yet"
# endif
# if (TIMX_INPUT_CLOCK % 1000000) != 0
# error "No way, timer clock must be divisible to 1e6. FIXME!"
/**
* UAVCAN_STM32_TIMX_INPUT_CLOCK can be used to manually override the auto-detected timer clock speed.
* This is useful at least with certain versions of ChibiOS which do not support the bit
* RCC_DKCFGR.TIMPRE that is available in newer models of STM32. In that case, if TIMPRE is active,
* the auto-detected value of TIMX_INPUT_CLOCK will be twice lower than the actual clock speed.
* Read this for additional context: http://www.chibios.com/forum/viewtopic.php?f=35&t=3870
* A normal way to use the override feature is to provide an alternative macro, e.g.:
*
* -DUAVCAN_STM32_TIMX_INPUT_CLOCK=STM32_HCLK
*
* Alternatively, the new clock rate can be specified directly.
*/
# ifdef UAVCAN_STM32_TIMX_INPUT_CLOCK
# undef TIMX_INPUT_CLOCK
# define TIMX_INPUT_CLOCK UAVCAN_STM32_TIMX_INPUT_CLOCK
# endif
extern "C" UAVCAN_STM32_IRQ_HANDLER(TIMX_IRQHandler);
@@ -121,7 +134,7 @@ void init()
nvicEnableVector(TIMX_IRQn, UAVCAN_STM32_IRQ_PRIORITY_MASK);
# if (TIMX_INPUT_CLOCK % 1000000) != 0
# error "No way, timer clock must be divisible to 1e6. FIXME!"
# error "No way, timer clock must be divisible by 1e6. FIXME!"
# endif
// Start the timer