HCS12开了两个定时器中断，一个定时器中断无法进入，求助

犬夜小叉 · 发表于 2016-6-15 15:10:24

本帖最后由犬夜小叉于 2016-6-16 08:09 编辑

写了一个定时器中断程序，pit0定时时间为20ms，pit1定时时间为40ms，两个定时器的中断优先级都相同，程序运行后能进入pit0 isr，led0会不断闪烁，周期为40ms，而pit1 isr不能进入，led1不闪烁，pit0和pit1单独使用时都能正常进入中断，程序如下，这是什么问题，哪位朋友能解答下，万分感谢！

#include <MC9S12XEP100.h>
#include <hidef.h>                            /* common defines and macros */
#include "derivative.h"                      /* derivative-specific definitions */

/* led initial */
void led_init()
{
DDRA |= 0x3c;
PORTA = 0;
}

/* pit0 isr */
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt VectorNumber_Vpit0 pit0_irq(void)
{
   PITTF_PTF0 = 1;

   /* led0 jump */
   PORTA_PA2 = ~PORTA_PA2;

}

/* pit1 isr */
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt VectorNumber_Vpit1 pit1_irq(void)
{
PITTF_PTF1 = 1;

/* led1 */
PORTA_PA3 = ~PORTA_PA3;
}

/* clock initial */
void clock_init()
{
/* set oscclk as sysclk */
CLKSEL &= 0X7F;

/* disable pll circuit */
PLLCTL &= 0X8F;

/* pllclk = 40m, fbus = 20m*/
SYNR |= 0x53;
REFDV |= 0X07;
POSTDIV = 0;

/* enable pll circuit */
PLLCTL |= 0X70;
asm NOP;
asm NOP;

/* pllclk is locked alredy */
while (!(CRGFLG & 0X08));

/* set pllclk as sysclk */
CLKSEL |= 0X80;
}

/* 20ms */
void pit0_init()
{
/* close PIT */
PITCFLMT_PITE = 0;

/* enable channel0 */
PITCE_PCE0 = 1;

/* 16-bit timer counts with micro time base 0 */
PITMUX_PMUX0 = 0;

/* micro timer0 count value */
PITMTLD0 = 100 - 1;

/* timer0 count value */
PITLD0 = 4000 - 1;

/* enable interrupt */
PITINTE_PINTE0 = 1;

/* enable PIT */
PITCFLMT_PITE = 1;
}

/* 40ms */
void pit1_init()
{
/* close PIT */
PITCFLMT_PITE = 0;

/* enable channel1 */
PITCE_PCE1 = 1;

/* 16-bit timer counts with micro time base 1 */
PITMUX_PMUX1 = 1;

/* micro timer1 count value */
PITMTLD1 = 100 - 1;

/* timer1 count value */
PITLD1 = 8000 - 1;

/* enable interrupt */
PITINTE_PINTE1 = 1;

/* enable PIT */
PITCFLMT_PITE = 1;
}

/* set pit0, pit1 interrrupt priority */
void interrupt_priority_set()
{
/* set pit0 priority */
INT_CFADDR = 0x70;
INT_CFDATA5 = 0x06;

/* set pit1 priority */
INT_CFADDR = 0x70;
INT_CFDATA4 = 0x06;
}

int main()
{
DisableInterrupts;

clock_init();
led_init();
pit0_init();
pit1_init();
interrupt_priority_set();

EnableInterrupts;

while (1);
}

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