這是我的程序，用來是實時測量由遙控器發(fā)出的pwm波的正脈沖的長度。pwm波70hz，正脈沖的長度可以從2.1ms到0.9ms之間調整。


//測量PWM波的正脈沖長
uint32 Pwm_Measure(void)
{   uint32 DUTY;
    T0PR = 0;
    T0TC = 0x00;
    
    while((IO0PIN&0x00000040) == 0);            //檢測p0.6的電壓信號
    T0TCR = 0x01;
    while((IO0PIN&0x00000040) != 0);
    T0TCR = 0x00;
    
    DUTY = T0TC;
    return(DUTY);
}


int main()
{    uint32 time;
    uint8 i;
    PINSEL0 = 0X00000005;                //設置i/o連接到UART0
    
    UART0_Init();
    //VICVECT_Init();
    
    while(1)
    {    
    time = Pwm_Measure();
        for(i=0; i<4; i++)
        {   rcv_buf[i] = time & 0xff;
            time = time >>8;
        }
        SendBuf();
        DelayNS(10);
    }
    return(0);
}