51单片机 LED点阵的呼吸灯效果

STC 89C52RC

#include

typedefunsignedcharuchar;

typedefunsignedintuint;

typedefunsignedlongulong;

sbitADDR0=P1^0;

sbitADDR1=P1^1;

sbitADDR2=P1^2;

sbitADDR3=P1^3;

sbitENLED=P1^4;

ulongperiodCnt=0;//PWM周期计数值

ucharhighRH=0;//高电平重载值的高字节

ucharhighRL=0;//高电平重载值的低字节

ucharlowRH=0;//低电平重载值的高字节

ucharlowRL=0;//低电平重载值的低字节

ucharT1RH=0;//T1重载值的高字节

ucharT1RL=0;//T1重载值的低字节

ucharcodedutyCycle[13]={//占空比调整表

5,18,30,41,51,60,68,75,81,86,90,93,95

};

ucharcodeimage[8]={

0x81,0x81,0xE7,0xC3,0xC3,0xE7,0x81,0x81

};

ucharhRHi[13],hRLi[13],lRHi[13],lRLi[13];

voidconfigTmr1(uintms);

voidconfigPWM(uintfr,uchardc);

voidcalcRldVal(ucharidx);

voidmain(){

uchari;

EA=1;//开总中断

ADDR3=0;//选中LED点阵

configPWM(1000,dutyCycle[0]);//配置并启动PWM

for(i=0;i<13;i++)

calcRldVal(i);

configTmr1(50);//用T1定时调整占空比

while(1);

}

/*配置并启动T1，ms-定时时间*/

voidconfigTmr1(uintms){

ulongtmp;//临时变量

tmp=11059200/12;//定时器计数频率

tmp=(tmp*ms)/1000;//计算所需的计数值

tmp=65536-tmp;//计算定时器重载值

tmp=tmp+12;//补偿中断响应延时造成的误差

T1RH=tmp>>8;//定时器重载值拆分为高低字节

T1RL=tmp;

TMOD&=0x0F;//清零T1的控制位

TMOD|=0x10;//配置T1为模式1

TH1=T1RH;//加载T1重载值

TL1=T1RL;

ET1=1;//使能T1中断

TR1=1;//启动T1

}

/*配置并启动PWM，fr-频率，dc-占空比*/

voidconfigPWM(uintfr,uchardc){

uinthigh,low;

periodCnt=11059200/12/fr;//计算一个周期所需的计数值

high=periodCnt*dc/100;//计算高电平所需的计数值

low=periodCnt-high;//计算低电平所需的计数值

high=65536-high+12;//计算高电平的定时器重载值并补偿中断延时

low=65536-low+12;//计算低电平的定时器重载值并补偿中断延时

highRH=high>>8;//高电平重载值拆分为高低字节

highRL=high;

lowRH=low>>8;//低电平重载值拆分为高低字节

lowRL=low;

TMOD&=0xF0;//清零T0的控制位

TMOD|=0x01;//配置T0为模式1

TH0=highRH;//加载T0重载值

TL0=highRL;

ET0=1;//使能T0中断

TR0=1;//启动T0

}

/*占空比调整函数，频率不变只调整占空比*/

voidcalcRldVal(ucharidx){

uinthigh,low;

high=periodCnt*dutyCycle[idx]/100;//计算高电平所需的计数值

low=periodCnt-high;//计算低电平所需的计数值

high=65536-high+12;//计算高电平的定时器重载值并补偿中断延时

low=65536-low+12;//计算低电平的定时器重载值并补偿中断延时

hRHi[idx]=high>>8;//高电平重载值拆分为高低字节

hRLi[idx]=high;

lRHi[idx]=low>>8;//低电平重载值拆分为高低字节

lRLi[idx]=low;

}

voidLED1_Scan(){

staticuchari=0;

P0=0xFF;

P1=(P1&0xF8)|i;

P0=image[i];

i=++i&0x07;

}

/*T0中断服务函数，产生PWM输出*/

voidinterruptTimer0()interrupt1{

if(ENLED==1){

TH0=lowRH;

TL0=lowRL;

ENLED=0;

LED1_Scan();

}

else{

TH0=highRH;

TL0=highRL;

ENLED=1;

}

}

/*T1中断服务函数，定时动态调整占空比*/

voidinterruptTimer1()interrupt3{

staticbitdir=0;

staticucharindex=0;

TH1=T1RH;//重新加载T1重载值

TL1=T1RL;

highRH=hRHi[index];

highRL=hRLi[index];

lowRH=lRHi[index];

lowRL=lRLi[index];

if(dir==0){

index++;

if(index==12)

dir=1;

}

else {