51单片机实现呼吸灯

只看该作者 · 2022-11-9 14:09

本帖最后由哆啦dd 于 2022-11-11 09:19 编辑

使用定时器0工作方式1，定时100us，每10ms改变一个占空比，呼吸有效果，但是呼吸几次后会保持长亮或者熄灭，找不到原因，有没有大神解惑。
以下为源码：
#include <reg52.h>

#define uint unsigned int
#define uchar unsigned char
typedef bit bool;

#define true 1
#define false 0

sbit LED1 = P1^0;

uint code BreathLEDArray[] = {
      0,1,2,3,4,5,6,7,7,7,
      7,8,10,12,13,13,13,15,15,16,
      17,22,22,25,25,25,30,33,38,40,
      40,45,51,55,67,70,72,73,75,77,
      80,83,90,95,96,97,98,99,99,100};

bool BreathLEDFlag;
bool BreathLEDPhase;             //true:½¥ÁÁ£»false:½¥Ãð

uchar BreathLEDIndex;
uchar BreathSystickCount;
uchar Flag_10ms;

void Init();
void BreathLEDHandle();

void main()
{
      Init();
      while(1)
      {
            BreathLEDHandle();
      }
}

void Init()
{
      TMOD = 0x01;
      TH0 = (65536-92) / 256;
      TL0 = (65536-92) % 256;
      EA = 1;
      ET0 = 1;
      TR0 = 1;

      BreathLEDFlag = true;
      BreathLEDPhase = false;
      BreathLEDIndex = 0;
      BreathSystickCount = 0;
      Flag_10ms = 0;
}

void BreathLEDHandle()
{
      if(!BreathLEDFlag)
      {
            return;
      }

      if(Flag_10ms % 10 == 0)
      {
            if((BreathLEDIndex > 0) && BreathLEDPhase) //½¥Ãð
            {
                     BreathLEDIndex--;
                     if(BreathLEDIndex <= 0)
                     {
                              BreathLEDIndex = 0;
                              BreathLEDPhase = false;
                     }
            } else if ((BreathLEDIndex < 49) && !BreathLEDPhase) {  //½¥ÁÁ
                     BreathLEDIndex++;
                     if(BreathLEDIndex >= 49)
                     {
                              BreathLEDIndex = 49;
                              BreathLEDPhase = true;
                     }
            }
      }

}

void T0_Interrupt() interrupt 1
{
      TH0 = (65536-92) / 256;
      TL0 = (65536-92) % 256;

      if(BreathLEDFlag)
      {
            BreathSystickCount++;
            if(BreathSystickCount >= BreathLEDArray[BreathLEDIndex])
            {
                     LED1 = 0;
            } else {
                     LED1 = 1;
            }

            if(BreathSystickCount >= 100)
            {
                     BreathSystickCount = 0;
                     Flag_10ms += 10;
                     if(Flag_10ms >= 65535)
                     {
                              Flag_10ms = 0;
                     }
            }

      }

}