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Merge pull request #20044 from bissell-homecare-inc/stm32_adc_cal

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cpu/stm32: add ADCAL operation
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Marian Buschsieweke 2023-11-28 08:48:45 +00:00 committed by GitHub
commit 7790f85054
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1 changed files with 11 additions and 0 deletions
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11
cpu/stm32/periph/adc_f0_g0.c
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@ -75,6 +75,17 @@ int adc_init(adc_t line)
}
/* reset configuration */
ADC1->CFGR2 = 0;
#if defined(ADC_CR_ADVREGEN)
/* calibrate ADC, per RM0454 section 14.3.3 */
/* 1. ensure ADEN=0, ADVREGEN=1, DMAEN=0 */
ADC1->CR |= ADC_CR_ADVREGEN;
ADC1->CR &= ~(ADC_CR_ADCAL | ADC_CR_ADEN );
ADC1->CFGR1 &= ~(ADC_CFGR1_DMAEN);
/* 2. Set ADCAL=1 */
ADC1->CR |= ADC_CR_ADCAL;
/* 3. Wait for ADCAL=0 (or EOCAL=1) */
while ((ADC1->ISR & ADC_ISR_EOCAL)) {}
#endif
/* enable device */
ADC1->CR = ADC_CR_ADEN;
/* configure sampling time to save value */