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Boots with SYSTICK source = HCLK, not HCLK/8 

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2151 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2009-10-17 21:45:39 +00:00
parent 3ebad7fc89
commit a2f69e06e1
1 changed files with 20 additions and 1 deletions
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21
arch/arm/src/stm32/stm32_timerisr.c
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@ -67,7 +67,14 @@
* register.
*/
#define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / 8 / CLK_TCK) - 1)
#undef CONFIG_STM32_SYSTICK_HCLKd8 /* Power up default is HCLK, not HCLK/8 */
/* And I don't know now to re-configure it yet */
#if CONFIG_STM32_SYSTICK_HCLKd8
# define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / 8 / CLK_TCK) - 1)
#else
# define SYSTICK_RELOAD ((STM32_HCLK_FREQUENCY / CLK_TCK) - 1)
#endif
/* The size of the reload field is 24 bits. Verify taht the reload value
* will fit in the reload register.
@ -126,6 +133,18 @@ void up_timerinit(void)
regval |= (NVIC_SYSH_PRIORITY_DEFAULT << NVIC_SYSH_PRIORITY_PR15_SHIFT);
putreg32(regval, NVIC_SYSH12_15_PRIORITY);
/* Make sure that the SYSTICK clock source is set correctly */
#if 0 /* Does not work. Comes up with HCLK source and I can't change it */
regval = getreg32(NVIC_SYSTICK_CTRL);
#if CONFIG_STM32_SYSTICK_HCLKd8
regval &= ~NVIC_SYSTICK_CTRL_CLKSOURCE;
#else
regval |= NVIC_SYSTICK_CTRL_CLKSOURCE;
#endif
putreg32(regval, NVIC_SYSTICK_CTRL);
#endif
/* Configure SysTick to interrupt at the requested rate */
putreg32(SYSTICK_RELOAD, NVIC_SYSTICK_RELOAD);