Question

51单片机输出周期20ms，占空比10%，pwm波控制舵机，这个程序错在哪？

#include <reg52.h>

sbit PWMOUT = P0^1;

unsigned char HighRH = 0;
unsigned char HighRL = 0;
unsigned char LowRH = 0;
unsigned char LowRL = 0;
void ConfigPWM(unsigned int fr, unsigned char dc);
void ClosePWM();

void main()
{
unsigned int i;

EA = 1; //开总中断

while (1)
{

ConfigPWM(50, 10); //频率100Hz，占空比10%

}
}
void ConfigPWM(unsigned int fr, unsigned char dc)
{
unsigned long tmp;
unsigned int high, low;

tmp = 11059200/12/fr; //需要tmp个机器周期
high = (tmp*dc)/100;
low = tmp - high;
high = 65536 - high + 12;
low = 65536 - low + 12;
HighRH = (unsigned char)(high >>8);
HighRL = (unsigned char)high;
LowRH = (unsigned char)(low >> 8);
LowRL = (unsigned char)low;
//TMOD &= 0xF0;
TMOD = 0x01;
TH0 = HighRH;
TL0 = HighRL;
ET0 = 1;
TR0 = 1;
PWMOUT = 1;

}

void InterruptTimer0() interrupt 1
{
if (PWMOUT == 1) //当前输出为高电平时，装载低电平值并输出低电平
{
TH0 = LowRH;
TL0 = LowRL;
PWMOUT = 0;
}
else //当前输出为低电平时，装载高电平值并输出高电平
{
TH0 = HighRH;
TL0 = HighRL;
PWMOUT = 1;
}
}

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Answer 1

//TMOD &= 0xF0;
TMOD = 0x01;

TMOD |=0x01；
是或等于

以下你只申明没有定义
void ClosePWM();

unsigned int i;

Answer 2

是不是没有输出脉冲？而且还进不了定时器中断？

Answer 3

可以发给我看看

原理图有吗