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Merge pull request #20756 from krzysztof-cabaj/nucleo-l4xxx-fix-ADC

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cpu/stm32-L4: fix ADC initialization
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benpicco 2024-07-04 14:22:39 +00:00 committed by GitHub
commit d312d36728
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1 changed files with 4 additions and 6 deletions
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10
cpu/stm32/periph/adc_l4.c
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@ -64,9 +64,6 @@
This specifies the first channel that goes to SMPR2 instead of SMPR1. */
#define ADC_SMPR2_FIRST_CHAN (10)
#define ADC_CCR_CKMODE_HCLK_1 (ADC_CCR_CKMODE_0)
#define ADC_CCR_CKMODE_HCLK_2 (ADC_CCR_CKMODE_1)
/**
* @brief Default VBAT undefined value
*/
@ -144,13 +141,14 @@ int adc_init(adc_t line)
ADC->CCR &= ~(ADC_CCR_PRESC);
ADC->CCR &= ~(ADC_CCR_CKMODE);
/* Setting ADC clock to HCLK/1 is only allowed if AHB clock prescaler is 1*/
if (!(RCC->CFGR & RCC_CFGR_HPRE_3)) {
/* set ADC clock to HCLK/1, only allowed if AHB clock prescaler is 1 */
ADC->CCR |= ADC_CCR_CKMODE_HCLK_1 << ADC_CCR_CKMODE_Pos;
/* set ADC clock to HCLK/1 */
ADC->CCR |= (ADC_CCR_CKMODE_0);
}
else {
/* set ADC clock to HCLK/2 otherwise */
ADC->CCR |= ADC_CCR_CKMODE_HCLK_2 << ADC_CCR_CKMODE_Pos;
ADC->CCR |= (ADC_CCR_CKMODE_1);
}
/* configure the pin */