頻率和占空比可調的方波發生器單片機源程序，哪位大神幫忙改一下

ID:393319 · 發表于 2018-9-4 09:40

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
float fosc=12000000;
sbit KEY1=P1^0;
sbit KEY2=P1^1;
sbit KEY3=P1^2;
sbit KEY4=P1^3;
sbit RS = P3^5;
sbit RW = P3^6;
sbit EN = P3^4;
sbit OUTPUT=P2^0;
uchar zkb;
uint freq;
uchar TIMER0_L,TIMER0_H,TIMER1_L,TIMER1_H;
void delay(uchar n)
{
uchar i;
while(n--)
{for(i=255;i>0;i--)
{}
}}
void chushihua()
{
P1=0x0f;
freq=50;
zkb=50;
TIMER0_L=0xe0;
TIMER0_H=0xb1;
TIMER1_L=0xf0;
TIMER1_H=0xd8;
TL0=0xe0;
TH0=0xb1;
TL1=0xf0;
TH1=0xd8;
TMOD=0x11;
EX0=1;
ET0=1;
ET1=1;
EA=1;
TR0=1;
TR1=1;
}
void Read_Busy()
{
uchar busy;
P0 = 0xff;
RS = 0;
RW = 1;
do
{
EN = 1;
busy = P0;
EN = 0;
}while(busy & 0x80);
}
void Write_Cmd(uchar cmd)
{
Read_Busy();
RS = 0;
RW = 0;
P0 = cmd;
EN = 1;
EN = 0;
}
void Write_Dat(uint dat)
{
Read_Busy();
RS = 1;
RW = 0;
P0 = dat;
EN = 1;
EN = 0;
}
void LCD_init()
{
Write_Cmd(0x38);
Write_Cmd(0x0c);
Write_Cmd(0x01);
Write_Cmd(0x06);
}
void main()
{
chushihua();
while(1)
{ }
}
void Timer0_freq() interrupt 1
{
TR1=1;
TH0=TIMER0_H;
OUTPUT=1;
}
void Timer1_zkb() interrupt 3
{
TR1=0;
TL1=TIMER1_L;
TH1=TIMER1_H;
OUTPUT=0;
}
void keyscan() interrupt 0 using 1
{float TF0,TZ1;
EX0=0;
delay(10);
if(P1!=0x0f)
{
if(KEY1==0) freq+=100;
if(KEY2==0) freq+=10;
if(freq>500) freq=50;
if(KEY3==0) zkb+=10;
if(KEY4==0) zkb++;
if(zkb>100) zkb=1;
TF0=(65536-fosc/(12.0*freq));
TZ1=(65536-(fosc*zkb)/(12.0*100*freq));
TIMER0_L=(uint)TF0%256;
TIMER1_H=(uint)TZ1/256;
TIMER1_L=(uint)TZ1%256;
}
P1=0x0f;
EX0=1;
TR0=1;
TR1=1;}

復制代碼

ID:1 · 發表于 2018-9-4 20:56

把問題具體描述一下吧

ID:375092 · 發表于 2018-9-4 21:26

首先用單片機發出頻率和方波這個叫PWM，一個很重要以后運用很廣泛的東西，很實用。我看你的程序應該是使用中斷程序調節PWM，改變占空比，這樣實際上可以改變電壓大小，PWM產生的方波，你調節的數字改變高電平的大小，然后12864現在你當前改變的的數值。那么你應該設定一個值，來充當你這個方波的周期，然后改變高電平就可以了，具體的細節需要你自己領悟，論壇里面應該有很多相關例程，你可以學習學習。