rt-thread-official/bsp/lpc2478/drivers/board.c

/*
 * File      : board.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, RT-Thread Develop 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
 * 2008-12-11     xuxinming    first version
 */

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

#include <LPC24xx.h>
#include "board.h"

#define DATA_COUNT 14400000/RT_TICK_PER_SECOND	/* T0MR0 = delayInMs * (Fpclk / 1000); */

extern void rt_hw_serial_init(void);

/**
 * @addtogroup LPC2478
 */
/*@{*/

void rt_timer_handler(int vector, void* param)
{
	T0IR |= 0x01;			/* clear interrupt flag */
	rt_tick_increase();
	VICVectAddr = 0;		/* Acknowledge Interrupt */
}

/**
 * This function will init LPC2478 board
 */
void rt_hw_board_init(void)
{
#if defined(RT_USING_DEVICE) && defined(RT_USING_UART1)
	rt_hw_serial_init();
	rt_console_set_device("uart1");
#endif

	T0IR 	= 0xff; 
	T0TC 	= 0;
	T0MCR 	= 0x03; 
	T0MR0 	= (DATA_COUNT);

	rt_hw_interrupt_install(TIMER0_INT, rt_timer_handler, RT_NULL, "tick");	
	rt_hw_interrupt_umask(TIMER0_INT);

	T0TCR = 0x01; //enable timer0 counter
}

/*@}*/