Fixes RMT examples and adds ESP32-S3 config (#6235)

Author: SuGlider

libraries/ESP32/examples/RMT/RMTCallback/RMTCallback.ino

@@ -12,7 +12,10 @@ class MyProcessor {
 
   public:
     MyProcessor(uint8_t pin, float nanoTicks) {
-      assert((rmt_recv = rmtInit(21, RMT_RX_MODE, RMT_MEM_192)));
+      if ((rmt_recv = rmtInit(pin, RMT_RX_MODE, RMT_MEM_192)) == NULL)
+      {
+        Serial.println("init receiver failed\n");
+      }
 
       realNanoTick = rmtSetTick(rmt_recv, nanoTicks);
     };
@@ -59,6 +62,6 @@ void setup()
 
 void loop()
 {
-  Serial.printf("GPIO 4: %08x 5: %08x 6: %08x\n", mp1.val(), mp2.val(), mp3.val());
+  Serial.printf("GPIO 4: %08x 5: %08x 10: %08x\n", mp1.val(), mp2.val(), mp3.val());
   delay(500);
 }

libraries/ESP32/examples/RMT/RMTWriteNeoPixel/RMTWriteNeoPixel.ino

@@ -5,6 +5,17 @@
 
 #include "esp32-hal.h"
 
+// The effect seen in ESP32C3, ESP32S2 and ESP32S3 is like a Blink of RGB LED
+#if CONFIG_IDF_TARGET_ESP32S2
+#define BUILTIN_RGBLED_PIN   18
+#elif CONFIG_IDF_TARGET_ESP32S3
+#define BUILTIN_RGBLED_PIN   48
+#elif CONFIG_IDF_TARGET_ESP32C3
+#define BUILTIN_RGBLED_PIN   8
+#else
+#define BUILTIN_RGBLED_PIN   21   // ESP32 has no builtin RGB LED
+#endif
+
 #define NR_OF_LEDS   8*4
 #define NR_OF_ALL_BITS 24*NR_OF_LEDS
 
@@ -41,7 +52,7 @@ void setup()
 {
     Serial.begin(115200);
 
-    if ((rmt_send = rmtInit(18, RMT_TX_MODE, RMT_MEM_64)) == NULL)
+    if ((rmt_send = rmtInit(BUILTIN_RGBLED_PIN, RMT_TX_MODE, RMT_MEM_64)) == NULL)
     {
         Serial.println("init sender failed\n");
     }