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為啥定時(shí)器1中，pwm=0呢。
- #include<reg52.h>
- typedef unsigned int uint;
- typedef unsigned char uchar;
- sbit pwm=P0^0;//輸出PWM信號(hào)
- uint pwm_value=1500;
- //初值為1.5ms
- uint value[]={1500,500,1500,1000,1500,2000,1500,2300,1500};//
- void delay_ms(uint x)
- {
- uint i;
- while(x--)for(i=0;i<125;i++);
- }
- void InitTimer(void)
- {
- TMOD=0x11;//開(kāi)定時(shí)器0,1
- TH0=-20000/256;//定時(shí)20MS,20MS為一個(gè)周期
- TL0=-20000%256;
- TH1=-1500/256;//定時(shí)1.5MS,這時(shí)舵機(jī)處于0度
- TL1=-1500%256;
- EA=1;//開(kāi)總斷
- TR0=1;//開(kāi)定時(shí)器0
- ET0=1;
- TR1=1;//開(kāi)定時(shí)器1
- ET1=1;
- }
- void timer0(void) interrupt 1//定時(shí)器0中斷函數(shù)
- {
- pwm=1;
- TH0=-20000/256;
- TL0=-20000%256;
- TR1=1;
- }
- void timer1(void) interrupt 3//定時(shí)器1中斷函數(shù)
- {
- pwm=0;
- TH1=-pwm_value/256;
- TL1=-pwm_value%256;
- TR1=0;
- }
- void main(void)//主函數(shù)
- {
- uchar i;
- InitTimer();
- pwm_value=1500;
- while(1)
- {
- for(i=0;i<9;i++)
- {
- pwm_value=value[i];//通過(guò)數(shù)組就可以改變舵機(jī)的轉(zhuǎn)角度
- delay_ms(1000);
- }
- }
- }
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