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stmhal: Port of f4 hal commit c568a2b to f7 hal

This commit is contained in:
Dave Hylands 2015-08-01 15:07:24 -07:00 committed by Damien George
parent 9e8eba797e
commit af9d885f8c
1 changed files with 6 additions and 1 deletions
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7
stmhal/hal/f7/src/stm32f7xx_hal_rcc.c
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@ -981,7 +981,12 @@ uint32_t HAL_RCC_GetSysClockFreq(void)
if (__HAL_RCC_GET_PLL_OSCSOURCE() != RCC_PLLCFGR_PLLSRC_HSI) if (__HAL_RCC_GET_PLL_OSCSOURCE() != RCC_PLLCFGR_PLLSRC_HSI)
{ {
/* HSE used as PLL clock source */ /* 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 else
{ {