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Correctly scale analog reading per issue #4794

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Paint Your Dragon 2022-05-24 08:44:09 -07:00 committed by GitHub
parent e9b9f0b13f
commit 44b31b098e
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1 changed files with 2 additions and 2 deletions
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ports/mimxrt10xx/common-hal/analogio/AnalogIn.c
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@ -81,8 +81,8 @@ uint16_t common_hal_analogio_analogin_get_value(analogio_analogin_obj_t *self) {
}
// Shift the value to be 16 bit
return ADC_GetChannelConversionValue(self->pin->adc, ADC_CHANNEL_GROUP) << 4;
// Stretch 12-bit ADC reading to 16 bits via 24-bit interim result
return (ADC_GetChannelConversionValue(self->pin->adc, ADC_CHANNEL_GROUP) * 0x1001) >> 8;
}
float common_hal_analogio_analogin_get_reference_voltage(analogio_analogin_obj_t *self) {