From bee406c2d4b3c18b38a6d55843bd6575ccd3d05d Mon Sep 17 00:00:00 2001
From: Phil Schatzmann <phil.schatzmann@gmail.com>
Date: Mon, 13 Nov 2023 16:27:39 +0100
Subject: [PATCH] AnalogDriverESP32V1 release calibration only when necessary

---
 src/AudioAnalog/AnalogAudioESP32V1.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/AudioAnalog/AnalogAudioESP32V1.h b/src/AudioAnalog/AnalogAudioESP32V1.h
index 8849a0c648..306b3377c2 100644
--- a/src/AudioAnalog/AnalogAudioESP32V1.h
+++ b/src/AudioAnalog/AnalogAudioESP32V1.h
@@ -71,11 +71,14 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
     if (active_rx) {
       adc_continuous_stop(adc_handle);
       adc_continuous_deinit(adc_handle);
+      // free up resources from calibration
+      if (cfg.adc_calibration_active) {
 #if ADC_CALI_SCHEME_CURVE_FITTING_SUPPORTED
-      adc_cali_delete_scheme_curve_fitting(adc_cali_handle);
+          adc_cali_delete_scheme_curve_fitting(adc_cali_handle);
 #elif !defined(CONFIG_IDF_TARGET_ESP32H2)
-      adc_cali_delete_scheme_line_fitting(adc_cali_handle);
+          adc_cali_delete_scheme_line_fitting(adc_cali_handle);
 #endif
+      }
     }
     converter.end();
     active_tx = false;
@@ -100,8 +103,8 @@ class AnalogDriverESP32V1 : public AnalogDriverBase {
   int available() override { return active_rx ? DEFAULT_BUFFER_SIZE : 0; }
 
 protected:
-  adc_continuous_handle_t adc_handle;
-  adc_cali_handle_t adc_cali_handle;
+  adc_continuous_handle_t adc_handle = nullptr;
+  adc_cali_handle_t adc_cali_handle = nullptr;
   AnalogConfigESP32V1 cfg;
   bool active = false;
   bool active_tx = false;