diff options
Diffstat (limited to 'ports/stm32/machine_adc.c')
| -rw-r--r-- | ports/stm32/machine_adc.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/ports/stm32/machine_adc.c b/ports/stm32/machine_adc.c index 8f07075914..c3211ea4f4 100644 --- a/ports/stm32/machine_adc.c +++ b/ports/stm32/machine_adc.c @@ -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) { uint32_t value; - #if defined(STM32G4) - // For STM32G4 there is errata 2.7.7, "Wrong ADC result if conversion done late after - // calibration or previous conversion". According to the errata, this can be avoided - // by performing two consecutive ADC conversions and keeping the second result. + #if defined(STM32G4) || defined(STM32WB) + // For STM32G4 errata 2.7.7 / STM32WB errata 2.7.1: + // "Wrong ADC result if conversion done late after calibration or previous conversion" + // 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++) #endif { |