第1个回答 2013-03-24
#include<reg51.h> // 试试 不过 仿真只能看波形图 实际电路 才有效果
sbit P1_0 = P1^0; // 8路PWM输出
sbit P1_1 = P1^1;
sbit P1_2 = P1^2;
sbit P1_3 = P1^3;
sbit P1_4 = P1^4;
sbit P1_5 = P1^5;
sbit P1_6 = P1^6;
sbit P1_7 = P1^7;
unsigned char PWM0 = 1; // 占空比调整
unsigned char PWM1 = 3;
unsigned char PWM2 = 5;
unsigned char PWM3 = 7;
unsigned char PWM4 = 9;
unsigned char PWM5 = 11;
unsigned char PWM6 = 13;
unsigned char PWM7 = 15;
unsigned char counter = 0; // 计数的
unsigned char tt1; // 标志位
void main()
{
TMOD=0x01;
TH0=(65536-2000)/256; // 定时时间 可以修改
TL0=(65536-2000)%256;
EA=1;
ET0=1;
TR0=1;
while(1)
{ // 开关调整 PWM 占空比
if(tt1==200)
{
tt1=0;
PWM0++;PWM1++;PWM2++;PWM3++;
PWM4++;PWM5++;PWM6++;PWM7++;
if(PWM0==17) PWM0=0;
if(PWM1==17) PWM1=0;
if(PWM2==17) PWM2=0;
if(PWM3==17) PWM3=0;
if(PWM4==17) PWM4=0;
if(PWM5==17) PWM5=0;
if(PWM6==17) PWM6=0;
if(PWM7==17) PWM7=0;
}
}
}
void Timer0(void) interrupt 1 // 定时器0 PWM 控制
{
TH0=(65536-2000)/256; // 定时时间 可以修改
TL0=(65536-2000)%256;
counter++;
tt1++;
if(counter >= 16) counter = 0; // PWM 16级 可以修改
if(counter >= PWM0) P1_0 = 0; else P1_0 = 1;
if(counter >= PWM1) P1_1 = 0; else P1_1 = 1;
if(counter >= PWM2) P1_2 = 0; else P1_2 = 1;
if(counter >= PWM3) P1_3 = 0; else P1_3 = 1;
if(counter >= PWM4) P1_4 = 0; else P1_4 = 1;
if(counter >= PWM5) P1_5 = 0; else P1_5 = 1;
if(counter >= PWM6) P1_6 = 0; else P1_6 = 1;
if(counter >= PWM7) P1_7 = 0; else P1_7 = 1;
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