Changed ESP32 tone emulation channel to 1

src/BuildOpt.h

@@ -128,7 +128,10 @@
     #define RADIOLIB_PROGMEM_READ_BYTE(addr)            pgm_read_byte(addr)
     #define RADIOLIB_SOFTWARE_SERIAL_UNSUPPORTED
     #define RADIOLIB_HARDWARE_SERIAL_PORT               Serial1
+
+    // ESP32 doesn't support tone(), but it can be emulated via LED control peripheral
     #define RADIOLIB_TONE_UNSUPPORTED
+    #define RADIOLIB_TONE_ESP32_CHANNEL                 (1)
 
   #elif defined(ARDUINO_ARCH_STM32)
     // official STM32 Arduino core (https://github.com/stm32duino/Arduino_Core_STM32)

src/Module.cpp

@@ -344,12 +344,9 @@ void Module::tone(RADIOLIB_PIN_TYPE pin, uint16_t value) {
     ::tone(pin, value);
   #else
     #if defined(ESP32)
-      // ESP32 - emulate tone() via LED driver on channel 15
-      if(ledcRead(15)) {
-        return;
-      }
-      ledcAttachPin(pin, 15);
-      ledcWriteTone(15, value);
+      // ESP32 tone() emulation
+      ledcAttachPin(pin, RADIOLIB_TONE_ESP32_CHANNEL);
+      ledcWriteTone(RADIOLIB_TONE_ESP32_CHANNEL, value);
     #endif
   #endif
 }
@@ -364,7 +361,7 @@ void Module::noTone(RADIOLIB_PIN_TYPE pin) {
   #else
   #if defined(ESP32)
     ledcDetachPin(pin);
-    ledcWrite(15, 0);
+    ledcWrite(RADIOLIB_TONE_ESP32_CHANNEL, 0);
   #endif
   #endif
 }