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Diffstat (limited to 'ports/stm32/machine_adc.c')
-rw-r--r--ports/stm32/machine_adc.c11
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
{