Fix PWM channels after restart (arendst#20732)

Author: arendst

lib/libesp32/ESP32-to-ESP8266-compat/src/esp8266toEsp32.cpp

@@ -323,6 +323,14 @@ int32_t analogAttach(uint32_t pin, bool output_invert) {    // returns ledc chan
   return chan;
 }
 
+void analogDetach(void) {
+  for (uint32_t pin = 0; pin < SOC_GPIO_PIN_COUNT; pin++) { 
+    if (pin_to_channel[pin] > 0) {
+      ledcDetachPin(pin);
+    }
+  }
+}
+
 extern "C" uint32_t ledcReadFreq2(uint8_t chan) {
 // extern "C" uint32_t __wrap_ledcReadFreq(uint8_t chan) {
   if (chan > MAX_PWMS) {

lib/libesp32/ESP32-to-ESP8266-compat/src/esp8266toEsp32.h

@@ -55,6 +55,8 @@ uint8_t ledcReadResolution(uint8_t chan);
 // Returns: hardware channel number, or -1 if it failed
 int32_t analogAttach(uint32_t pin, bool output_invert = false);   // returns the ledc channel, or -1 if failed. This is implicitly called by analogWrite if the channel was not already allocated
 
+void analogDetach(void);
+
 // change both freq and range
 // `0`: set to global value
 // `-1`: keep unchanged

tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino

@@ -1816,6 +1816,11 @@ void HandleModuleConfiguration(void) {
 
   if (Webserver->hasArg(F("save"))) {
     ModuleSaveSettings();
+
+#ifdef CONFIG_IDF_TARGET_ESP32
+    analogDetach();
+#endif
+
     WebRestart(1);
     return;
   }