feat(rmt): legacy driver example

Author: SuGlider

libraries/ESP32/examples/RMT/Legacy_RMT_Driver_Compatible/Legacy_RMT_Driver_Compatible.ino

@@ -0,0 +1,39 @@
+#ifndef NO_NEW_RMT_DRV
+// add the file "build_opt.h" to your Arduino project folder with "-DNO_NEW_RMT_DRV" to use the RMT Legacy driver
+#warning "NO_NEW_RMT_DRV is not defined, using new RMT driver"
+
+#define RMT_PIN 4  // Valid GPIO for ESP32, S2, S3, C3, C6 and H2
+bool installed = false;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("This sketch uses the new RMT driver.");
+  installed = rmtInit(RMT_PIN, RMT_TX_MODE, RMT_MEM_NUM_BLOCKS_1, 10000000);
+}
+
+void loop() {
+  Serial.println("RMT New driver is installed: " + installed ? String("Yes.") : String("No."));
+  delay(5000);
+}
+
+#else
+
+// add the file "build_opt.h" to your Arduino project folder with "-DNO_NEW_RMT_DRV" to use the RMT Legacy driver
+// neoPixelWrite() is a function that writes to the RGB LED and it won't be available here
+#include "driver/rmt.h"
+
+bool installed = false;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("This sketch is using the RMT Legacy driver.");
+  installed = rmt_driver_install(RMT_CHANNEL_0, 0, 0) == ESP_OK;
+}
+
+void loop() {
+  Serial.println("RMT Legacy driver is installed: " + installed ? String("Yes.") : String("No."));
+  delay(5000);
+}
+
+
+#endif

libraries/ESP32/examples/RMT/Legacy_RMT_Driver_Compatible/build_opt.h

@@ -0,0 +1 @@
+-DNO_NEW_RMT_DRV