#include<reg51.h>
#include<intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit out1=P0^0;
sbit out2=P0^1;
sbit out3=P0^2;
sbit out4=P0^3;
bit pwm0;bit pwm1;
bit o1,o2,o3,o4;
uchar G_pwm_num0=50;//（占空比為50%），這兩個參數的最大值為100，因為下面count<=0
uchar G_pwm_num1=50;
uchar count;
void time_init()
{
TMOD=0x21;
EA=1;
TH1=156;
TL1=156;
TR1=1;
ET1=1;
ET0=1;
TH0=0;
TL0=0;
}
void time1() interrupt 3
{
count++;
if(count<G_pwm_num0)
pwm0=1;
else pwm0=0;
if(count<G_pwm_num1)
pwm1=1;
else pwm1=0;
if(count==100) //這里的占空比是這樣算的（G_pwm_num0/100,G_pwm_num1/100）
{
count=0;
}
else _nop_();
out1=o1&&pwm0;//left+
out2=o2&&pwm0;
out3=o3&&pwm1;//right+
out4=o4&&pwm1;
}
void main()
{
time_init();
G_pwm_num0=50;//占空比可自行定義大小
o1=1;
o2=0;//當兩者都為0時，停止
G_pwm_num1=50;
o3=1;
o4=0;
while(1);
} |
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