uart.c

在阳初s3c2410开发板上实现的xmodem传输协议

#include "uart.h"

void init_uart()
{
	/* Set GPI0 for UART */
	GPHCON 	= 0x16faaa;
	GPHDAT  = 0x0;
	GPHUP  	= 0x07ff;

	/* Initialize UART */
	ULCON0  = 0x03;	// 8 bits, no parity, one stop bit
	UCON0   = 0x05;	// interrupt request or polling mode
	UFCON0  = 0x00;	// no FIFO
	UMCON0  = 0x00;	// no flow control
	UBRDIV0 = (50000000 / (115200 * 16))-1; // boud-rate 115200
}

int isempty() 
{
	return !(UTRSTAT0 & 1);
}

int isfull() 
{
	return !(UTRSTAT0 & (1<<2));
}

char sio_getchar() 
{
	while (isempty());
	return URXH0;
}

void sio_putchar(char c) 
{	
	if (c == '\n') {
		while (isfull());
		UTXH0 = '\r';
	}
	while (isfull());
	UTXH0 = c;
}