占空比，频率可调PWM波发生器程序

ID:454945 · 发表于 2018-12-26 13:09

占空比和频率都可调的两对互补的pwm波，其中由四个按钮来分别控制占空比和频率的加减

#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
uint shiwan,wan,qian,bai,shi,ge;
//uint D[]={shiwan,wan,qian,bai,shi,ge};
uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x80}; //共阴极数码管段码表
//uchar code wei[]={0xdf,0xef,0xf7,0xfb,0xfd,0xfe};
uint a, b,f=500;
sbit P1_0=P1^0;
sbit P1_1=P1^1;
sbit SegSel=P2^6; //段选
sbit BitSel=P2^7;
sbit P3_6=P3^6;
sbit P3_7=P3^7;
void delay_ms(uint x)
{
uint i,j;
for(i=x;i>0;i--)
for(j=240;j>0;j--)
;
}
/*void show()
{
uint i;
for(i=0;i<6;i++)
{
BitSel=1;P0=wei[i];BitSel=0;SegSel=1;P0=table[D[i]];SegSel=0;delay_ms(1);
}
} */
void display(uint a,uint b,uint c,uint d,uint e,uint f) //数码管显示函数
{
P2=0xfe;
P0=table[f];
delay_ms(2);
P2=0xfd;
P0=table[e];
delay_ms(2);
P2=0xfb;
P0=table[d];
delay_ms(2);
P2=0xf7;
P0=table[c];
delay_ms(2);
P2=0xef;
P0=table[b];
delay_ms(2);
P2=0xdf;
P0=table[a];
delay_ms(2);
}
//------------------------------------------
void main()
{
TMOD = 0x01; //T0定时方式1
TH0 = (65536-100000/f) / 256; //50ms@12MHz
TL0 = (65536-100000/f) % 256;
TR0 = 1;
ET0 = 1;
EX0 = 1; EX1 = 1;
IT0 = 1; IT1 = 1;
EA = 1;
a = 0;
b = 5;
if(P3_6==1)
f=f-500;
if(P3_7==1)
f=f+500;
if(f<500)
f=500;
if(f>9500)
f=9500;
shiwan=b/10;
wan=table[9];
qian=b%10;
bai=f/1000;
shi=table[9];
ge=f%1000/100;
display(ge,shi,bai,qian,wan,shiwan);
while(1);
}
//------------------------------------------
void time0() interrupt 1
{
TL0 = (65536-100000/f) % 256;
TH0 = (65536-100000/f) / 256; //50ms@12MHz
a++;
if(a == 10) a = 0; //在这里调整周期.
if(a < b)
{P1_0 = 0xff; //在这里调整占空比.
P1_1 =~P1_0;
}
else {
P1_0 = 0x00;
P1_1 =~P1_0;}
}
//------------------------------------------
void X0_INT() interrupt 0
{
b++;
if(b > 10) b = 10; //占空比等级最大为19
}
//------------------------------------------
void X1_INT() interrupt 2
{
b--;
if(b < 1) b = 1; //占空比等级最小为1.
}

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占空比，频率可调PWM波发生器程序

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