T1的中断问题，请教各位了！！！急急

只看该作者 · 2007-3-27 14:45

设计思路：我想用Mega64 T1的比较匹配中断，产生固定的定时间隔。比如1ms或是10ms。
设置T1的工作模式(WGMn3:0 = 4) 设置OCR1A = 2000；打开了匹配中断 TIMSK |= (1<<OCIE1A)；附上源码

#include <iom64v.h>
#include <macros.h>

#pragma interrupt_handler isr_timer1:15
unsigned int  counter;

void main()
{
       counter   = 300;
      TCCR1B |= (1<<WGM12);
      OCR1A  = 2000;
      DDRB     = 0xF0;

      SEI();
      TIMSK     |= (1<<OCIE1A);

      TCCR1B |= 1<<CS10;

      while(1);
}

void   isr_timer1()
{
      if(counter != 0)
    {
       counter--;
    }
    else
    {
        counter = 300;
        PORTB ^= 1<<PB7;
    }
}

但是接在PB7的LED并没有按照600ms闪烁一次。不知道是什么原因，还望高手指点。

只看该作者 · 2007-4-3 14:01

注意对定时器输入时钟的设置，CS12,CS11,CS10位，默认是没有CLOCK的

只看该作者 · 2007-4-3 17:14

刚看错了，

只看该作者 · 2007-4-4 00:27

timer1_compa_isr:13

中断向量都没有搞对哦，好像。

//ICC-AVR application builder : 2007-4-4 0:44:06
// Target : M64
// Crystal: 4.0000Mhz

#include <iom64v.h>
#include <macros.h>

void port_init(void)
{
PORTA = 0x00;
DDRA  = 0x00;
PORTB = 0x00;
DDRB  = 0xF0;
PORTC = 0x00; //m103 output only
DDRC  = 0x00;
PORTD = 0x00;
DDRD  = 0x00;
PORTE = 0x00;
DDRE  = 0x00;
PORTF = 0x00;
DDRF  = 0x00;
PORTG = 0x00;
DDRG  = 0x00;
}

//TIMER1 initialize - prescale:256
// WGM: 0) Normal, TOP=0xFFFF
// desired value: 10mSec
// actual value:  9.984mSec (0.2%)
void timer1_init(void)
{
TCCR1B = 0x00; //stop
TCNT1H = 0xFF; //setup
TCNT1L = 0x64;
OCR1AH = 0x00;
OCR1AL = 0x9C;
OCR1BH = 0x00;
OCR1BL = 0x9C;
OCR1CH = 0x00;
OCR1CL = 0x9C;
ICR1H  = 0x00;
ICR1L  = 0x9C;
TCCR1A = 0x00;
TCCR1B = 0x04; //start Timer
}

#pragma interrupt_handler timer1_compa_isr:13
void timer1_compa_isr(void)
{
//compare occured TCNT1=OCR1A
}

//call this routine to initialize all peripherals
void init_devices(void)
{
//stop errant interrupts until set up
CLI(); //disable all interrupts
XDIV  = 0x00; //xtal divider
XMCRA = 0x00; //external memory
port_init();
timer1_init();

MCUCR = 0x00;
EICRA = 0x00; //extended ext ints
EICRB = 0x00; //extended ext ints
EIMSK = 0x00;
TIMSK = 0x10; //timer interrupt sources
ETIMSK = 0x00; //extended timer interrupt sources
SEI(); //re-enable interrupts
//all peripherals are now initialized
}

相关链接:http://www.avrvi.com/

T1的中断问题，请教各位了！！！急急

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呵呵

中断向量不对，程序也不明了