match ledcWrite_RGB example in esp32 docs

Author: brentru

examples/adafruitio_09_analog_out/adafruitio_09_analog_out.ino

@@ -30,8 +30,7 @@ void setup() {
 
   // set up led pin as an analog output
   #if defined(ARDUINO_ARCH_ESP32)
-    // ESP32 pinMode()
-    ledcAttachPin(LED_PIN,analogGetChannel(LED_PIN));
+    ledcAttach(LED_PIN, 12000, 8); // 12 kHz PWM, 8-bit resolution
   #else
     pinMode(LED_PIN, OUTPUT);
   #endif

examples/adafruitio_13_rgb/adafruitio_13_rgb.ino

@@ -39,10 +39,9 @@ void setup() {
 
 
   #if defined(ARDUINO_ARCH_ESP32) // ESP32 pinMode
-    // assign rgb pins to channels
-    ledcAttachPin(RED_PIN,analogGetChannel(RED_PIN));
-    ledcAttachPin(GREEN_PIN,analogGetChannel(GREEN_PIN));
-    ledcAttachPin(BLUE_PIN,analogGetChannel(BLUE_PIN));
+    ledcAttach(RED_PIN, 12000, 8); // 12 kHz PWM, 8-bit resolution
+    ledcAttach(GREEN_PIN, 12000, 8);
+    ledcAttach(BLUE_PIN, 12000, 8);
   #else
     pinMode(RED_PIN, OUTPUT);
     pinMode(GREEN_PIN, OUTPUT);