serial.c

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

/*
 * File      : serial.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2009-02-05     Bernard      first version
 */

#include <rthw.h>
#include <rtthread.h>

#include <stm32f10x_lib.h>                        // STM32F10x Library Definitions

#define USARTx   USART1                           // USART1 is used

/**
 * @addtogroup STM32
 */
/*@{*/

/**
 * This function is used to display a string on console, normally, it's
 * invoked by rt_kprintf
 *
 * @param str the displayed string
 */
void rt_console_puts(const char* str)
{
	while (*str)
	{
		rt_serial_putc (*str++);
	}
}

/**
 * This function initializes serial
 */
void rt_serial_init()
{
}

/**
 * This function read a character from serial without interrupt enable mode
 *
 * @return the read char
 */
char rt_serial_getc()
{
	while (!(USARTx->SR & USART_FLAG_RXNE));

	return ((char)(USARTx->DR & 0xFF));
}

/**
 * This function will write a character to serial without interrupt enable mode
 *
 * @param c the char to write
 */
void rt_serial_putc(const char c)
{
	/*
		to be polite with serial console add a line feed
		to the carriage return character
	*/
	if (c=='\n')rt_serial_putc('\r');

	while (!(USARTx->SR & USART_FLAG_TXE));
	USARTx->DR = (c & 0x1FF);
}

/*@}*/