retargetserial.c File Reference

Provide stdio retargeting to USART/UART or LEUART.


Copyright 2018 Silicon Laboratories Inc.

SPDX-License-Identifier: Zlib

The licensor of this software is Silicon Laboratories Inc.

This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.

Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
  2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
  3. This notice may not be removed or altered from any source distribution.

Definition in file retargetserial.c.

#include <stdio.h>
#include "em_device.h"
#include "em_cmu.h"
#include "em_core.h"
#include "em_gpio.h"
#include "retargetserial.h"
#include "retargetserialconfig.h"


#define RXBUFSIZE   8


static void disableRxInterrupt ()
 Disable RX interrupt.
static void enableRxInterrupt ()
 Enable RX interrupt.
int RETARGET_ReadChar (void)
 Receive a byte from USART/LEUART and put into global buffer.
void RETARGET_SerialCrLf (int on)
 UART/LEUART toggle LF to CRLF conversion.
bool RETARGET_SerialEnableFlowControl (void)
 Enable hardware flow control. (RTS + CTS)
void RETARGET_SerialFlush (void)
void RETARGET_SerialInit (void)
 Intializes UART/LEUART.
int RETARGET_WriteChar (char c)
 Transmit single byte to USART/LEUART.


static bool initialized = false
static uint8_t LFtoCRLF = 0
static volatile uint8_t rxBuffer [RXBUFSIZE]
static volatile int rxCount = 0
static volatile int rxReadIndex = 0
static volatile int rxWriteIndex = 0