键盘抖动问题

smjacky 2008-10-15 09:27 楼主

for (;;)
{
dwVal = rINTPND;
if ((dwVal & MASK_BIT(21)) == 0)
{
continue;
}
//EXTINTPND 寄存器，判断是哪个外部中断触发
dwVal = rEXTINTPND;
if ((dwVal & MASK_BIT(EXTINT4)) != 0)
{
rEXTINTPND |= MASK_BIT(EXTINT4);
//外部中断4 产生了，点亮LED1
if(rPDATC & MASK_BIT(LED1))
{
sysUtilsLightLed (LED1, FALSE);
printf("Turn off %s",leds[LED1 - 1]);
}
else
{
sysUtilsLightLed (LED1, TRUE);
printf("Turn on %s",leds[LED1 - 1]);
}
printf(" *** rINTPND = %02X , rPDATC = %02X ***\n",rINTPND, rPDATC);
sysUtilsDelay(10000000); //延时
rEXTINTPND &= ~MASK_BIT(EXTINT4);//在这里清零
rINTPND = 8; //还原rINTPND
continue;
}
if ((dwVal & MASK_BIT(EXTINT5)) != 0)
{
//......
}
if ((dwVal & MASK_BIT(EXTINT6)) != 0)
{
//......
}
if ((dwVal & MASK_BIT(EXTINT7)) != 0)
{
rEXTINTPND |= MASK_BIT(EXTINT7);
//外部中断7 产生了，点亮LED1,2,3
sysUtilsLightLed (LED_ALL, FALSE);
}
//最后清除中断位
rI_ISPC |= MASK_BIT(21);
rI_ISPC = dwVal;
}

我用以上代码实现按键控制LED(按一次灯亮,再按一次灯熄灭),开始的时候灯不亮,按下按键,灯亮后进入sysUtilsDelay延时,但是延时完之后灯又熄灭了
是不是我代码有问题?
我用ARM7+S3C44B0X(SUMSUNG)

回复评论（5）

4楼 mars_v

if(rPDATC & MASK_BIT(LED1))
   {
         sysUtilsLightLed (LED1, FALSE);
         printf("Turn off %s",leds[LED1 - 1]);
   }

看了一下,像是没有中断的时候

你这句执行了,呵呵,把你的灯给关了

再理一下逻辑看看

点赞 2008-10-18 19:35

感谢两位参与,后来我发现是键盘缓存的问题,用以下方法解决了:
#define INTERNVAL 0x0000a000 //有效间隔

void KeyLedTest (void)
{
  U32 dwVal;
  int internval = INTERNVAL;
  int i;

  //设置IO 口PORT G
  rPCONG |= 0xff00;

  //设置中断
  rINTMOD &= ~MASK_BIT(21);
  rINTCON &= ~MASK_BIT(1);

  //设置EXTINT4,5,6,7中断模式,我们这里使用低电平触发
  rEXTINT &= 0xffff; //先清除EXTINT4,5,6,7的相应设置bit位

  for (;;)
  {
dwVal = rINTPND;
internval++;
if(internval >= INTERNVAL)
internval = INTERNVAL;
if((dwVal & MASK_BIT(21)) == 0)
{
for(i = 0;i < 10000;i++){}
continue;
}

//EXTINTPND 寄存器，判断是哪个外部中断触发
dwVal = rEXTINTPND;

if (((dwVal & MASK_BIT(EXTINT4)) != 0) && (internval >= INTERNVAL))
{
      printf("Status of LED1 is going to be changed.");
      internval = 0;
   rEXTINTPND |= MASK_BIT(EXTINT4);
   //外部中断4 产生了，点亮LED1
   if(rPDATC & MASK_BIT(LED1))
   {
   sysUtilsLightLed (LED1, FALSE);
   printf("Turn off %s",leds[LED1 - 1]);
   }
   else
   {
      sysUtilsLightLed (LED1, TRUE);
      printf("Turn on %s",leds[LED1 - 1]);
   }
}

if ((dwVal &  MASK_BIT(EXTINT5)) != 0)
{
      //......
}

if (((dwVal &  MASK_BIT(EXTINT6)) != 0) && (internval >= INTERNVAL))
{
      //......
}

if (((dwVal &  MASK_BIT(EXTINT7)) != 0) && (internval >= INTERNVAL))
{
   rEXTINTPND |= MASK_BIT(EXTINT7);
   //外部中断7 产生了，点亮LED1,2,3
   sysUtilsLightLed (LED_ALL, FALSE);
}
//最后清除中断位
rI_ISPC |= MASK_BIT(21);
//rI_ISPC = dwVal;
rEXTINTPND &= ~(MASK_BIT(EXTINT4)|MASK_BIT(EXTINT5)|MASK_BIT(EXTINT6));
  }
}

点赞 2008-10-20 11:14