updating webusb with cdc

examples/device/webusb/src/main.c

@@ -54,7 +54,7 @@ enum  {
 static uint32_t blink_interval_ms = BLINK_NOT_MOUNTED;
 
 void led_blinking_task(void);
-void midi_task(void);
+void cdc_task(void);
 
 /*------------- MAIN -------------*/
 int main(void)
@@ -66,6 +66,7 @@ int main(void)
   while (1)
   {
     tud_task(); // tinyusb device task
+    cdc_task();
     led_blinking_task();
   }
 
@@ -108,6 +109,51 @@ void tud_resume_cb(void)
 //--------------------------------------------------------------------+
 
 
+//--------------------------------------------------------------------+
+// USB CDC
+//--------------------------------------------------------------------+
+void cdc_task(void)
+{
+  if ( tud_cdc_connected() )
+  {
+    // connected and there are data available
+    if ( tud_cdc_available() )
+    {
+      uint8_t buf[64];
+
+      // read and echo back
+      uint32_t count = tud_cdc_read(buf, sizeof(buf));
+
+      for(uint32_t i=0; i<count; i++)
+      {
+        tud_cdc_write_char(buf[i]);
+
+        if ( buf[i] == '\r' ) tud_cdc_write_char('\n');
+      }
+
+      tud_cdc_write_flush();
+    }
+  }
+}
+
+// Invoked when cdc when line state changed e.g connected/disconnected
+void tud_cdc_line_state_cb(uint8_t itf, bool dtr, bool rts)
+{
+  (void) itf;
+
+  // connected
+  if ( dtr && rts )
+  {
+    // print initial message when connected
+    tud_cdc_write_str("\r\nTinyUSB CDC MSC HID device example\r\n");
+  }
+}
+
+// Invoked when CDC interface received data from host
+void tud_cdc_rx_cb(uint8_t itf)
+{
+  (void) itf;
+}
 
 //--------------------------------------------------------------------+
 // BLINKING TASK