智能车制作

标题: [求助]关于多通道PIT使用问题 [打印本页]

作者: tccyk 时间: 2011-3-7 21:23
标题: [求助]关于多通道PIT使用问题
当开两个PIT通道时，总是进不了第二个PIT中断。部分代码如下
#pragma CODE_SEG __NEAR_SEG NON_BANKED
void interrupt VectorNumber_Vpit1 Vpit1_ISR(void){

PITTF=0x02;

PIT初始化如下：
void PIT_init(void) //PIT初始化
{
  PITCFLMT_PITE=0;
  PITCE_PCE0=1;
  PITCE_PCE1=1;
  PITMTLD0=40-1;
  PITMTLD1=40-1;
  PITLD0=PITTIME1-1; //PITTIME1，PITTIME2有define
  PITLD1=PITTIME2-1;
  PITINTE_PINTE0=1;
  PITINTE_PINTE1=1;
  PITCFLMT_PITE=1;
}

请高手不吝赐教。

作者: 寺枫叶0808 时间: 2011-3-13 15:08
因为你的PITTF只清除了一道PIT通道而已。你换成PITTF_PTFx去清除吧

作者: 中国风 时间: 2011-5-15 10:32
这样好像也不行也

作者: KAI990610 时间: 2011-10-19 20:51
同时使用PIT模块的0,1定时通道，实现两盏LED灯实现2比1频率的闪动。
程序代码如下：
#include <hidef.h>    /* common defines and macros */
#include "derivative.h"    /* derivative-specific definitions */
#define unsigned int uint
#define BUS_CLOCK 24000000
uint i=0;
uint j=0;
byte shuma[20]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,    //0~9对应的段码
            0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,0x87,0xff,0xef};
void INIT_PLL(void)
{
CLKSEL &= 0x7f;    //set OSCCLK as sysclk
PLLCTL &= 0x8F;    //Disable PLL circuit
CRGINT &= 0xDF;

#if(BUS_CLOCK == 40000000)
   SYNR = 0x44;
#elif(BUS_CLOCK == 32000000)
   SYNR = 0x43;
#elif(BUS_CLOCK == 24000000)
   SYNR = 0x42;
#endif
REFDV = 0x81;       //PLLCLK=2×OSCCLK×(SYNR+1)/(REFDV+1)＝64MHz ,fbus=32M
PLLCTL =PLLCTL|0x70;  //Enable PLL circuit
asm NOP;
asm NOP;
while(!(CRGFLG&0x08)); //PLLCLK is Locked already
CLKSEL |= 0x80;       //set PLLCLK as sysclk
}

void PitInit(void)
{
  PITCFLMT_PITE = 1; //使能PIT模块
  PITCE = 0X00;    //通道0,1 PIT模块禁止
  PITINTE = 0x03; //通道0,1中断使能
  PITMUX = 0x00;    //16位定时通道0使用0号8位微计数器，16位定时器1使用1号微计数器
  PITLD0 = 240-1;
  PITMTLD0 = 100-1;
  PITLD1 = 120-1;
  PITCE = 0X03;    //通道0,1 PIT模块使能
}
void InitPortb(void){
  DDRB = 0XFF;
  PORTB = 0XFF;
}
void main(void)
{
  INIT_PLL(); //设置锁相环
  PitInit();
  InitPortb();
EnableInterrupts;

  for(;;) {

  } /* loop forever */
  /* please make sure that you never leave main */
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED
interrupt 66 void PIT0(void)
{
// PITTF_PTF0 = 1;
//用这PITTF_PTF0 = 1清除不了标志位，翻了下数据手册看到
//If flag clearing by writing a one and flag setting happen in the same bus clock cycle,
//the flag remains set.The flag bits are cleared if the PIT module is disabled
// or if thecorresponding timer channel is disabled.

PITCE_PCE0=0; //通道禁止
PITCE_PCE0=1;
i++;
if(i==1000)
{
i = 0;
PORTB_PB0 = ~PORTB_PB0;
}

}
interrupt 67 void PIT1(void)
{
//PITTF_PTF1 = 1;
PITCE_PCE1=0;
PITCE_PCE1=1;

j++;
if(j==1000)
{
j = 0;
PORTB_PB1 = ~PORTB_PB1;
}

}

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