From 48775f20a0a3d29651e46339bf1266651efebef2 Mon Sep 17 00:00:00 2001
From: Dmitry Kaukov <dkaukov@opentable.com>
Date: Mon, 31 Mar 2025 22:31:15 +1100
Subject: [PATCH] Scale ADC to 16bit

---
 src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h   | 6 ++++++
 src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h b/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h
index 83d7bf169..d38ddfba0 100644
--- a/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h
+++ b/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32.h
@@ -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);
diff --git a/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h b/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h
index 54638d1bd..664ef2fa6 100644
--- a/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h
+++ b/src/AudioTools/CoreAudio/AudioAnalog/AnalogDriverESP32V1.h
@@ -395,7 +395,7 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
                                     *result16 = 0;
                                 }
                             } else {
-                                *result16 = data;
+                                *result16 = data << 4; // Scale 12-bit to 16-bit
                             }
                             result16++;
                         } else {