From 1e8c59aa61dc3c33a6d054102a8b702cd58bdb2c Mon Sep 17 00:00:00 2001
From: Phil Schatzmann <phil.schatzmann@gmail.com>
Date: Mon, 13 Nov 2023 11:00:54 +0100
Subject: [PATCH] AnalogConfigESP32V1 sample rate stereo

---
 src/AudioAnalog/AnalogAudioESP32V1.h  | 9 +++++----
 src/AudioAnalog/AnalogConfigESP32V1.h | 4 ++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/src/AudioAnalog/AnalogAudioESP32V1.h b/src/AudioAnalog/AnalogAudioESP32V1.h
index 2e5a3554c0..bbfa0e0a37 100644
--- a/src/AudioAnalog/AnalogAudioESP32V1.h
+++ b/src/AudioAnalog/AnalogAudioESP32V1.h
@@ -294,7 +294,7 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
 
     /// Configure the ADC
     adc_continuous_config_t dig_cfg = {
-        .sample_freq_hz = (uint32_t)cfg.sample_rate,
+        .sample_freq_hz = (uint32_t)cfg.sample_rate * cfg.channels,
         .conv_mode = cfg.adc_conversion_mode,
         .format = cfg.adc_output_type,
     };
@@ -375,14 +375,15 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
   }
 
   bool checkADCSampleRate() {
+    int sample_rate =  cfg.sample_rate * cfg.channels;
     // Boundary checks
-    if ((cfg.sample_rate < SOC_ADC_SAMPLE_FREQ_THRES_LOW) ||
-        (cfg.sample_rate > SOC_ADC_SAMPLE_FREQ_THRES_HIGH)) {
+    if ((sample_rate < SOC_ADC_SAMPLE_FREQ_THRES_LOW) ||
+        (sample_rate > SOC_ADC_SAMPLE_FREQ_THRES_HIGH)) {
       LOGE("sample rate: %u can not be set, range: %u to %u",
            SOC_ADC_SAMPLE_FREQ_THRES_LOW, SOC_ADC_SAMPLE_FREQ_THRES_HIGH);
       return false;
     } else {
-      LOGI("sample rate: %u, range: %u to %u", cfg.sample_rate,
+      LOGI("sample rate: %u, range: %u to %u", sample_rate,
            SOC_ADC_SAMPLE_FREQ_THRES_LOW, SOC_ADC_SAMPLE_FREQ_THRES_HIGH);
     }
     return true;
diff --git a/src/AudioAnalog/AnalogConfigESP32V1.h b/src/AudioAnalog/AnalogConfigESP32V1.h
index f133dd5e77..3220e1f847 100644
--- a/src/AudioAnalog/AnalogConfigESP32V1.h
+++ b/src/AudioAnalog/AnalogConfigESP32V1.h
@@ -84,6 +84,10 @@ class AnalogConfigESP32V1 : public AudioInfo {
       bits_per_sample = 16;
       rx_tx_mode = rxtxMode;
       if (rx_tx_mode == RX_MODE) {
+        // make sure that the proposed sample rate is valid
+        if (sample_rate*channels>SOC_ADC_SAMPLE_FREQ_THRES_HIGH){
+          sample_rate = SOC_ADC_SAMPLE_FREQ_THRES_HIGH / channels;
+        }
         LOGI("I2S_MODE_ADC_BUILT_IN");
       } else {
         LOGI("I2S_MODE_DAC_BUILT_IN");