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| author | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-09-28 19:14:37 +0000 |
|---|---|---|
| committer | patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3> | 2009-09-28 19:14:37 +0000 |
| commit | fa0e1e5d0b4bbbeb2af68e1517997dba6ef60ec9 (patch) | |
| tree | 407649dda3a972888a1f1b3ddfb3592716cbf94a /nuttx/arch/arm/src/stm32/stm32_timerisr.c | |
| parent | a76921a3c964a7f32b973d9f676c92f84d63442f (diff) | |
| download | px4-nuttx-fa0e1e5d0b4bbbeb2af68e1517997dba6ef60ec9.tar.gz px4-nuttx-fa0e1e5d0b4bbbeb2af68e1517997dba6ef60ec9.tar.bz2 px4-nuttx-fa0e1e5d0b4bbbeb2af68e1517997dba6ef60ec9.zip | |
Add RCC support
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2101 42af7a65-404d-4744-a932-0658087f49c3
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_timerisr.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_timerisr.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_timerisr.c b/nuttx/arch/arm/src/stm32/stm32_timerisr.c index d25448391..32c51de59 100644 --- a/nuttx/arch/arm/src/stm32/stm32_timerisr.c +++ b/nuttx/arch/arm/src/stm32/stm32_timerisr.c @@ -61,11 +61,13 @@ * system clock ticks per second. That value is a user configurable setting * that defaults to 100 (100 ticks per second = 10 MS interval). * - * The timer counts at the rate SYSCLK_FREQUENCY as defined in the board.h - * header file. + * The RCC feeds the Cortex System Timer (SysTick) with the AHB clock (HCLK) + * divided by 8. The SysTick can work either with this clock or with the + * Cortex clock (HCLK), configurable in the SysTick Control and Status + * register. */ -#define SYSTICK_RELOAD ((SYSCLK_FREQUENCY / CLK_TCK) - 1) +#define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / 8 / CLK_TCK) - 1) /* The size of the reload field is 24 bits. Verify taht the reload value * will fit in the reload register. |