Merge pull request #489 from houkhouk/fix/Serial_send

fix byte count and delay when writing on serial

network/serial_network/HAL/NATIVE/serial_network_hal.c

@@ -329,32 +329,34 @@ void SerialHAL_Send(uint8_t *data, uint16_t size)
         LUOS_ASSERT(0);
     }
 #else
-
     // Check if the output buffer is full
     int bytes_in_buffer;
+    ssize_t totalBytesWritten = 0;
     ssize_t bytesWritten;
     ioctl(serial_port, TIOCOUTQ, &bytes_in_buffer);
     bytesWritten = write(serial_port, data, size);
-    if (bytesWritten < 0)
+    if (bytesWritten > 0)
     {
-        printf("Error writing to serial port\n");
-        close(serial_port);
-        LUOS_ASSERT(0);
+        totalBytesWritten += bytesWritten;
     }
-    while (bytesWritten < size)
+    while (totalBytesWritten < size)
     {
         // Wait for the buffer to be empty
         usleep(1000);
         ioctl(serial_port, TIOCOUTQ, &bytes_in_buffer);
-        bytesWritten += write(serial_port, &data[bytesWritten], size - bytesWritten);
+        bytesWritten = write(serial_port, &data[bytesWritten], size - bytesWritten);
         if (bytesWritten < 0)
         {
             printf("Error writing to serial port\n");
             close(serial_port);
             LUOS_ASSERT(0);
         }
+        else
+        {
+            totalBytesWritten += bytesWritten;
+        }
     }
-    LUOS_ASSERT(bytesWritten == size);
+    LUOS_ASSERT(totalBytesWritten == size);
 #endif
     Serial_TransmissionEnd();
 }