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drivers: adc: stm32f1 adc driver enable peripheral

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This commit avoid re-enabling the ADC,
because this starts conversion.
According to the RefMan (RM0008) of the stm32F10x mcu,
enabling the ADC will start the conversion
if the ADC is already enabled. "Conversion starts when
this bit holds a value of 1 and a 1 is written to it."
That's not what we want.

Signed-off-by: Francois Ramu <francois.ramu@st.com>
This commit is contained in:
Francois Ramu 2022-07-06 14:42:46 +02:00 committed by Carles Cufí
parent 3f71ff8a73
commit 085cdd9277
1 changed files with 8 additions and 4 deletions
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12
drivers/adc/adc_stm32.c
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@ -471,6 +471,9 @@ static void adc_stm32_oversampling(ADC_TypeDef *adc, uint8_t ratio, uint32_t shi
*/
static int adc_stm32_enable(ADC_TypeDef *adc)
{
if (LL_ADC_IsEnabled(adc) == 1UL) {
return 0;
}
#if defined(CONFIG_SOC_SERIES_STM32L4X) || \
defined(CONFIG_SOC_SERIES_STM32L5X) || \
defined(CONFIG_SOC_SERIES_STM32WBX) || \
@ -479,10 +482,6 @@ static int adc_stm32_enable(ADC_TypeDef *adc)
defined(CONFIG_SOC_SERIES_STM32H7X) || \
defined(CONFIG_SOC_SERIES_STM32WLX)
if (LL_ADC_IsEnabled(adc) == 1UL) {
return 0;
}
LL_ADC_ClearFlag_ADRDY(adc);
LL_ADC_Enable(adc);
@ -503,6 +502,11 @@ static int adc_stm32_enable(ADC_TypeDef *adc)
}
}
#else
/*
* On the stm32F10x, do not re-enable the ADC :
* if ADON holds 1 (LL_ADC_IsEnabled is true) and 1 is written,
* then conversion starts ; that's not what is expected
*/
LL_ADC_Enable(adc);
#endif