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stm32f3: rcc: support setting ADC prescalers

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If you are in async mode (ADC_CCR.CKMODE == 0) (the reset default) you still
need to set the prescalers before the ADC will actually enable.
This commit is contained in:
Karl Palsson
2015-10-23 20:47:14 +00:00
parent 674cd9bfe9
commit 489dc5125e
2 changed files with 25 additions and 32 deletions
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10
lib/stm32/f3/rcc.c
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@@ -462,5 +462,15 @@ void rcc_usb_prescale_1(void)
{
RCC_CFGR |= RCC_CFGR_USBPRES;
}
void rcc_adc_prescale(uint32_t prescale1, uint32_t prescale2)
{
uint32_t clear_mask = (RCC_CFGR2_ADCxPRES_MASK << RCC_CFGR2_ADC12PRES_SHIFT) |
(RCC_CFGR2_ADCxPRES_MASK << RCC_CFGR2_ADC34PRES_SHIFT);
uint32_t set = (prescale1 << RCC_CFGR2_ADC12PRES_SHIFT) |
(prescale2 << RCC_CFGR2_ADC34PRES_SHIFT);
RCC_CFGR2 &= ~(clear_mask);
RCC_CFGR2 |= (set);
}
/**@}*/