serial.c

这是EP7312开发板的一些测试与开发的源代码

/*
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[e-mail]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Alex Zuepke <[e-mail]>
 *
 * Copyright (C) 1999 2000 2001 Erik Mouw ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

void init_serial()
{
        *(volatile unsigned long *)0x800004C0 = 0x00070001;
        *(volatile unsigned long *)0x80000100 = (*(volatile unsigned long *)0x80000100) | 0x0100;
}

  
/*
 * Initialise the serial port with the given baudrate. The settings
 * are always 8 data bits, no parity, 1 stop bit, no start bits.
 *
 */
void uart_putc(const char c)
{
 
  	int tmo = 0;

	while((*(volatile unsigned long*)0x80000140 & (1 << 23))){
		tmo++;
		if (tmo == 5000)
			break;
	}
    	
	*(volatile unsigned char *)0x80000480 = c;
}

/*
 * Output a single byte to the serial port.
 */
void serial_putc(const char c)
{

    /* If \n, also do \r */
    if(c == '\n')
      uart_putc('\r');

	uart_putc(c);
}

void puts(char *s)
{
	while (*s){
		serial_putc(*s);
		s++;
	}
}