Inital code swapping DMX input over to use esp_dmx

wled00/dmx.cpp

@@ -99,13 +99,59 @@ void initDMX() {}
 #endif
 
 #ifdef WLED_ENABLE_DMX_INPUT
+
+bool dmxIsConnected = false;
+unsigned long dmxLastUpdate = 0;
+
 void handleDMXInput() {
-  dmx.update();
-  uint8_t data[512] = {};
-  for(int i=0; i < 512; i++) {
-    data[i] = dmx.read(i + 1);
+  byte data[DMX_PACKET_SIZE];
+  /* We need a place to store information about the DMX packets we receive. We
+    will use a dmx_packet_t to store that packet information.  */
+  dmx_packet_t packet;
+
+  /* And now we wait! The DMX standard defines the amount of time until DMX
+    officially times out. That amount of time is converted into ESP32 clock
+    ticks using the constant `DMX_TIMEOUT_TICK`. If it takes longer than that
+    amount of time to receive data, this if statement will evaluate to false. */
+  if (dmx_receive(dmxPort, &packet, DMX_TIMEOUT_TICK)) {
+    /* If this code gets called, it means we've received DMX data! */
+
+    /* Get the current time since boot in milliseconds so that we can find out
+      how long it has been since we last updated data and printed to the Serial
+      Monitor. */
+    unsigned long now = millis();
+
+    /* We should check to make sure that there weren't any DMX errors. */
+    if (!packet.err) {
+      /* If this is the first DMX data we've received, lets log it! */
+      if (!dmxIsConnected) {
+        DEBUG_PRINTLN("DMX is connected!");
+        dmxIsConnected = true;
+      }
+
+      /* Don't forget we need to actually read the DMX data into our buffer so
+        that we can print it out. */
+      dmx_read(dmxPort, data, packet.size);
+
+      if (now - dmxLastUpdate > 1000) {
+        /* Print the received start code - it's usually 0. */
+        DEBUG_PRINTF("Start code is 0x%02X and slot 1 is 0x%02X\n", data[0],
+                      data[1]);
+        dmxLastUpdate = now;
+      }
+    } else {
+      /* Oops! A DMX error occurred! Don't worry, this can happen when you first
+        connect or disconnect your DMX devices. If you are consistently getting
+        DMX errors, then something may have gone wrong with your code or
+        something is seriously wrong with your DMX transmitter. */
+     DEBUG_PRINTLN("A DMX error occurred.");
+    }
+  } else if (dmxIsConnected) {
+    DEBUG_PRINTLN("DMX was disconnected.");
+  }
+  if(dmxIsConnected) {
+    DEBUG_PRINTF("DMX channel 1 = %u\n", data(1)); // TODO: remove from final code
+    handleDMXData(1, 512, data, 1, REALTIME_MODE_DMX, 0);
   }
-  handleDMXData(1, 512, data, 1, REALTIME_MODE_DMX, 0);
-  DEBUG_PRINTF("DMX channel 1 = %u\n", dmx.read(1)); // TODO: remove from final code
 }
 #endif