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AnalogAudioStream: Scale ADC to 16bit #1985

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AnalogAudioStream: Scale ADC to 16bit #1985

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6 changes: 6 additions & 0 deletions src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h
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Original file line number Diff line number Diff line change
Expand Up @@ -190,6 +190,12 @@ class AnalogDriverESP32 : public AnalogDriverBase {
if (i2s_read(port_no, dest, size_bytes, &result, adc_config.timeout)!=ESP_OK){
TRACEE();
}
// Scale 12-bit ADC values to 16-bit
uint16_t *samples = reinterpret_cast<uint16_t *>(dest);
size_t sample_count = result / sizeof(uint16_t);
for (size_t i = 0; i < sample_count; i++) {
samples[i] <<= 4; // Scale 12-bit to 16-bit
}
// make sure that the center is at 0
if (adc_config.is_auto_center_read){
auto_center.convert(dest, result);
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2 changes: 1 addition & 1 deletion src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h
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Original file line number Diff line number Diff line change
Expand Up @@ -395,7 +395,7 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
*result16 = 0;
}
} else {
*result16 = data;
*result16 = data << 4; // Scale 12-bit to 16-bit
}
result16++;
} else {
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