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stm32/adc: Apply re-read errata for WB55.

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Following 17898f8607.

Signed-off-by: Damien George <damien@micropython.org>
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Damien George
2025-06-25 14:23:36 +10:00
parent 9a9e5529af
commit ea2000b81d
1 changed files with 7 additions and 4 deletions
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11
ports/stm32/adc.c
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@@ -464,10 +464,13 @@ static void adc_config_channel(ADC_HandleTypeDef *adc_handle, uint32_t channel)
static uint32_t adc_read_channel(ADC_HandleTypeDef *adcHandle) { static uint32_t adc_read_channel(ADC_HandleTypeDef *adcHandle) {
uint32_t value; uint32_t value;
#if defined(STM32G4) #if defined(STM32G4) || defined(STM32WB)
// For STM32G4 there is errata 2.7.7, "Wrong ADC result if conversion done late after // For STM32G4 errata 2.7.7 / STM32WB errata 2.7.1:
// calibration or previous conversion". According to the errata, this can be avoided // "Wrong ADC result if conversion done late after calibration or previous conversion"
// by performing two consecutive ADC conversions and keeping the second result. // states an incorrect reading is returned if more than 1ms has elapsed since the last
// reading or calibration. According to the errata, this can be avoided by performing
// two consecutive ADC conversions and keeping the second result.
// Note: On STM32WB55 @ 64Mhz each ADC read takes ~ 3us.
for (uint8_t i = 0; i < 2; i++) for (uint8_t i = 0; i < 2; i++)
#endif #endif
{ {