timer.c

用LPC936实现通过SPI扩展多个串口,在这里实现了对多个通道的管理,C代码,

#include "timer.h"
#include <REG935.h>
#include "uart.h"

unsigned long timer_count=0;
void init_timer(void)
{
	TMOD = 0x01;
	TAMOD = 0x00;
	TH0 = 0x15;
	TL0 = 0x8B;
	timer_count = 0;
}

void start_timer(void)
{
	init_timer();
	ET0 = 1;
	TR0 = 1;
}

void TIME_INT(void) interrupt 1
{
	TF0 = 0;
	TH0 = 0x15;
	TL0 = 0x8B;
	TR0 = 1;
	timer_count++;
	
}