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stmhal/hal/rcc: reapply HAL commit c568a2b for f4

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This commit is contained in:
Krzysztof Blazewicz 2016-09-08 18:20:32 +02:00
parent 4f7c5fa647
commit e2b4822189
1 changed files with 6 additions and 1 deletions
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7
stmhal/hal/f4/src/stm32f4xx_hal_rcc.c
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@ -893,7 +893,12 @@ __weak uint32_t HAL_RCC_GetSysClockFreq(void)
if(__HAL_RCC_GET_PLL_OSCSOURCE() != RCC_PLLSOURCE_HSI)
{
/* HSE used as PLL clock source */
pllvco = ((HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));
//pllvco = ((HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN)));
// dpgeorge: Adjust the way the arithmetic is done so it retains
// precision for the case that pllm doesn't evenly divide HSE_VALUE.
// Must be sure not to overflow, so divide by 4 first. HSE_VALUE
// should be a multiple of 4 (being a multiple of 100 is enough).
pllvco = ((HSE_VALUE / 4) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> POSITION_VAL(RCC_PLLCFGR_PLLN))) / pllm * 4;
}
else
{