Prvni ulozeni z chegewara githubu

libraries/ESP32/examples/RMT/RMTLoopback/RMTLoopback.ino

@@ -0,0 +1,74 @@
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
+#include "Arduino.h"
+
+#include "esp32-hal.h"
+
+#if CONFIG_IDF_TARGET_ESP32C3
+// ESP32 C3 has only 2 channels for RX and 2 for TX, thus MAX RMT_MEM is 128
+#define RMT_TX_PIN 4
+#define RMT_RX_PIN 5
+#define RMT_MEM_RX RMT_MEM_128
+#else 
+#define RMT_TX_PIN 18
+#define RMT_RX_PIN 21
+#define RMT_MEM_RX RMT_MEM_192
+#endif
+
+rmt_data_t my_data[256];
+rmt_data_t data[256];
+
+rmt_obj_t* rmt_send = NULL;
+rmt_obj_t* rmt_recv = NULL;
+
+static EventGroupHandle_t events;
+
+void setup() 
+{
+    Serial.begin(115200);
+    events = xEventGroupCreate();
+    
+    if ((rmt_send = rmtInit(RMT_TX_PIN, RMT_TX_MODE, RMT_MEM_64)) == NULL)
+    {
+        Serial.println("init sender failed\n");
+    }
+    if ((rmt_recv = rmtInit(RMT_RX_PIN, RMT_RX_MODE, RMT_MEM_RX)) == NULL)
+    {
+        Serial.println("init receiver failed\n");
+    }
+
+    float realTick = rmtSetTick(rmt_send, 100);
+    printf("real tick set to: %fns\n", realTick);
+    // both will keep same tick 
+    realTick = rmtSetTick(rmt_recv, 100);
+}
+
+void loop() 
+{
+    // Init data
+    int i;
+    for (i=0; i<255; i++) {
+        data[i].val = 0x80010001 + ((i%13)<<16) + 13-(i%13);
+    }
+    data[255].val = 0;
+
+    // Start receiving
+    rmtReadAsync(rmt_recv, my_data, 100, events, false, 0);
+
+    // Send in continous mode
+    rmtWrite(rmt_send, data, 100);
+
+    // Wait for data
+    xEventGroupWaitBits(events, RMT_FLAG_RX_DONE, 1, 1, portMAX_DELAY);
+
+    // Printout the received data plus the original values
+    for (i=0; i<60; i++)
+    {
+        Serial.printf("%08x=%08x ", my_data[i].val, data[i].val );
+        if (!((i+1)%4)) Serial.println("\n");
+    }
+    Serial.println("\n");
+
+    delay(2000);
+}