HardwareSerial: use correct UART HW for TX #180

openwch/arduino_core_ch32#180

Author: jobitjoseph

cores/arduino/ch32/uart.c

@@ -523,13 +523,40 @@ int uart_getc(serial_t *obj, unsigned char *c)
     return -1; 
   }
 
+    if (!USART_GetFlagStatus(uart_handlers[obj->index]->Instance, USART_FLAG_RXNE)){
+    return -1;
+  }
   *c = (unsigned char)USART_ReceiveData(uart_handlers[obj->index]->Instance);
 
   return 0;
 }
 
 
+/**
+  * @brief  Write byte to uart
+  * @param  obj : pointer to serial_t structure
+  * @retval error status
+  */
+int uart_putc(serial_t *obj, unsigned char c)
+{
+  uint32_t tickstart = GetTick();
+
+  if (obj == NULL) {
+    return -1;
+  }
+
+  while (serial_tx_active(obj))
+  {
+    if ((GetTick() - tickstart) >= TX_TIMEOUT)
+    {
+      return 0;
+    }
+  }
+
+  USART_SendData(uart_handlers[obj->index]->Instance, c);
 
+  return 0;
+}