Merge branch 'master' into feature/cmake_update

examples/peripherals/rmt_tx/main/rmt_tx_main.c

@@ -15,6 +15,7 @@ static const char *RMT_TX_TAG = "RMT Tx";
 
 #define RMT_TX_CHANNEL RMT_CHANNEL_0
 #define RMT_TX_GPIO 18
+#define SAMPLE_CNT  (10)
 
 /*
  * Prepare a raw table with a message in the Morse code
@@ -48,6 +49,37 @@ rmt_item32_t items[] = {
     {{{ 0, 1, 0, 0 }}}
 };
 
+//Convert uint8_t type of data to rmt format data.
+static void IRAM_ATTR u8_to_rmt(const void* src, rmt_item32_t* dest, size_t src_size, 
+                         size_t wanted_num, size_t* translated_size, size_t* item_num)
+{
+    if(src == NULL || dest == NULL) {
+        *translated_size = 0;
+        *item_num = 0;
+        return;
+    }
+    const rmt_item32_t bit0 = {{{ 32767, 1, 15000, 0 }}}; //Logical 0
+    const rmt_item32_t bit1 = {{{ 32767, 1, 32767, 0 }}}; //Logical 1
+    size_t size = 0;
+    size_t num = 0;
+    uint8_t *psrc = (uint8_t *)src;
+    rmt_item32_t* pdest = dest;
+    while (size < src_size && num < wanted_num) {
+        for(int i = 0; i < 8; i++) {
+            if(*psrc & (0x1 << i)) {
+                pdest->val =  bit1.val; 
+            } else {
+                pdest->val =  bit0.val;
+            }
+            num++;
+            pdest++;
+        }
+        size++;
+        psrc++;
+    }
+    *translated_size = size;
+    *item_num = num;
+}
 
 /*
  * Initialize the RMT Tx channel
@@ -77,18 +109,22 @@ static void rmt_tx_int()
 
     ESP_ERROR_CHECK(rmt_config(&config));
     ESP_ERROR_CHECK(rmt_driver_install(config.channel, 0, 0));
+    ESP_ERROR_CHECK(rmt_translator_init(config.channel, u8_to_rmt));
 }
 
-
 void app_main(void *ignore)
 {
     ESP_LOGI(RMT_TX_TAG, "Configuring transmitter");
     rmt_tx_int();
     int number_of_items = sizeof(items) / sizeof(items[0]);
+    const uint8_t sample[SAMPLE_CNT] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
 
     while (1) {
         ESP_ERROR_CHECK(rmt_write_items(RMT_TX_CHANNEL, items, number_of_items, true));
         ESP_LOGI(RMT_TX_TAG, "Transmission complete");
+        vTaskDelay(1000 / portTICK_PERIOD_MS);
+        ESP_ERROR_CHECK(rmt_write_sample(RMT_TX_CHANNEL, sample, SAMPLE_CNT, true));
+        ESP_LOGI(RMT_TX_TAG, "Sample transmission complete");
         vTaskDelay(2000 / portTICK_PERIOD_MS);
     }
     vTaskDelete(NULL);