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stm32/machine_adc: Enable ADC re-read errata handling for STM32WB55.

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Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
This commit is contained in:
Andrew Leech 2025-04-16 16:26:34 +10:00 committed by Damien George
parent 3e33d0567f
commit 17898f8607
1 changed files with 7 additions and 4 deletions
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11
ports/stm32/machine_adc.c
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@ -445,10 +445,13 @@ static void adc_config_channel(ADC_TypeDef *adc, uint32_t channel, uint32_t samp
static uint32_t adc_read_channel(ADC_TypeDef *adc) { static uint32_t adc_read_channel(ADC_TypeDef *adc) {
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
{ {