外部中断速度不够快

Question

我一直在测量阿迪诺号的高度。它会升高，然后保持高的几毫秒。然后，它被拉低1单位，然后浮回高点。我的代码似乎没有意识到这条线被拉得很低。对于中断来说，1U太快了吗？我怎么才能慢下来呢？

谢谢

编辑我的想法是，使用RC滤波器与二极管一起，以减缓上升时间足以让阿尔杜诺识别变化，但只有当变化发生时，从接收线。这可行吗？或者我可以用同样的方式使用带有二极管的脉冲扩展芯片吗？

#define ESC 2 //the digital pin the esc signal line is attached to

int throttlePos = 0;

volatile unsigned long timer_start;
volatile int last_interrupt_time;
volatile int pulse_time;

void setup() {
 // put your setup code here, to run once:
 pinMode(ESC, OUTPUT); //originally set the ESC's line to output to keep line high ready for throttle armature
 digitalWrite(ESC, HIGH); //keep the pulse high due to inverted throttle pulse
 Serial.begin(115200); //opens the serial port for use when testing
 timer_start = 0; 
   attachInterrupt(digitalPinToInterrupt(ESC), calcSignal, CHANGE);
 for(throttlePos = 0; throttlePos <= 1000; throttlePos += 1) //these for loops arm the ESC by emulating an inverted PWM pulse, process takes two seconds
 {
   digitalWrite(ESC, LOW);
   delayMicroseconds(1500);
   digitalWrite(ESC, HIGH);
   delayMicroseconds(100);
 }
 for(throttlePos = 1000; throttlePos <= 2000; throttlePos += 1)
 {
   digitalWrite(ESC, LOW);
   delayMicroseconds(1000);
   digitalWrite(ESC, HIGH);
   delayMicroseconds(100);
 }
}

void loop() {
 digitalWrite(ESC, LOW);
 delayMicroseconds(1200);
 digitalWrite(ESC, HIGH);
 delayMicroseconds(100);
 delay(19);
 Serial.println(pulse_time);
}
void calcSignal() 
{
   //record the interrupt time so that we can tell if the receiver has a signal from the transmitter 
   last_interrupt_time = micros(); 
   //if the pin has gone HIGH, record the microseconds since the Arduino started up 
   if(digitalRead(ESC) == HIGH) 
   { 
       timer_start = micros();
   } 
   //otherwise, the pin has gone LOW 
   else
   { 
       //only worry about this if the timer has actually started
       if(timer_start != 0)
       { 
           //record the pulse time
           pulse_time = ((volatile int)micros() - timer_start);
           //restart the timer
           timer_start = 0;
       }
   } 
}

​

​

Answer 1

1/1U为1 1MHz。考虑到您的Arduino在16 that执行指令(最好是一些指令需要更长的时间)，您的中断处理程序可能很容易丢失一些东西。但是，即使中断条件在中断结束之前被清除，中断仍然应该执行。

您是将Arduino库用于中断，还是直接在寄存器级别配置引脚更改中断？

你证实过进入阿杜伊诺的脉搏是电的声音吗？如果不了解更多关于你的电路，就很难提出解决方案。