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標題: AVR328 PWM轉PPM源程序 [打印本頁]

作者: zhanguang 時間: 2018-10-13 16:16
標題: AVR328 PWM轉PPM源程序
#define ppm_in_pin 2
#define ppm_pulseIn  4
unsigned  int RC_count = 0;
unsigned  int PPM_HIGH = 0;
void RC_in() {
  RC_count++;
}
void setup()
{

  DDRB = DDRB | 0X1F ;
  DDRD = DDRD | 0XE0 ;
  Serial.begin(57600);
  pinMode(ppm_in_pin, INPUT_PULLUP);
  pinMode(ppm_pulseIn, INPUT);
  attachInterrupt(0, RC_in, RISING); //上升沿觸發中斷
}
void  RC_valout() {
  switch ( RC_count ) {
//第一通道
case 0:  {
      PORTD = PORTD & 0X1F; //PD后三位清零
      PORTD = PORTD | 0X20;//PD5輸出高電平
      PORTB = PORTB & 0XE0; //PB前五位清零
   }; break;
//第二通道PD6
case 1: {
      PORTD = PORTD & 0X1F; //PD后三位清零
      PORTD = PORTD | 0X40; //PD6輸出高電平
      PORTB = PORTB & 0XE0; //PB前五位清零
   }; break;
//第三通道PD7
case 2: {
      PORTD = PORTD & 0X1F; //PD后三位清零
      PORTD = PORTD | 0X80; //PD7輸出高電平
      PORTB = PORTB & 0XE0; //PB前五位清零
   }; break;
//第四通道PB0
case 3:  {
      PORTD = PORTD & 0X1F; //PD后三位清零
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTB = PORTB | 0X01; //PB0輸出高電平
   }; break;
//第五通道PB1
case 4:  {
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTB = PORTB | 0X02; //PB1輸出高電平
   }; break;
//第六通道PB2
case 5: {
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTB = PORTB | 0X04; //PB2輸出高電平
   }; break;
//第七通道PB3
case 6: {
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTB = PORTB | 0X08; //PB3輸出高電平
   }; break;
//第八通道PB4
case 7:  {
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTB = PORTB | 0X10; //PB4輸出高電平
   }; break;
case 8:  {
      PORTB = PORTB & 0XE0; //PB前五位清零
      PORTD = PORTD & 0X1F; //PD后三位清零
   }; break;
  }
}
void loop()
{
  PPM_HIGH = pulseIn(ppm_pulseIn, HIGH);
  if (PPM_HIGH > 3000) {
RC_count = 0;
  }
  RC_valout();

}

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