Databases
StackOverflow2013
Postsdbo
POArduino - Using interrupts freezes processing and serial output?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POArduino - Using interrupts freezes processing and serial output?
    primarykey
    data
    text
    <p>So, the interrupts seem to work insofar as "interrupting" when an event happens. My only problem is that I the interrupts will occur 2-3 times and everything essentially stops (Serial out, everything). </p> <p>I was programming the board to output serially a calculated distance based on the output of the HC-SR04 distance IC. The distances are calculated accurately but, like I said earlier, everything seems to freeze. Below is both the code and an image of the serial monitor. </p> <p><img src="https://i.stack.imgur.com/2gQZV.png" alt="enter image description here"></p> <pre><code>#define TRIGPIN 4 #define ECHOPIN 3 #define RED 2 #define GREEN 13 #define INTNUM 1 //interrupt pin 1 is digital pin 3 on the duemilanove #define PULSE 10 //microseconds #define CYCLETIME 50 //milliseconds void ledWrite(int), trigPulse(), getTime(); int millisNow, millisPrev = 0; int microsPrev; boolean isHigh = false; void setup() { Serial.begin (9600); pinMode(TRIGPIN, OUTPUT); pinMode(ECHOPIN, INPUT); pinMode(RED, OUTPUT); pinMode(GREEN, OUTPUT); attachInterrupt(INTNUM, getTime, CHANGE); } void loop() { trigPulse(); // some other code while waiting on HC-SR04 to interrupt us when echo goes HIGH } void trigPulse(){ if( (millisNow = millis()) - millisPrev &gt;= CYCLETIME){ //sufficient cycle time digitalWrite(TRIGPIN, HIGH); delayMicroseconds(PULSE); digitalWrite(TRIGPIN, LOW); millisPrev = millisNow; //reset clock } return; } void ledWrite(int dTime){ int distance = dTime/58.2; if (distance &lt; 4) { digitalWrite(RED,HIGH); digitalWrite(GREEN,LOW); } else { digitalWrite(RED,LOW); digitalWrite(GREEN,HIGH); } if (distance &gt;= 200 || distance &lt;= 0){ Serial.println("Out of range"); } else { Serial.print(distance); Serial.println(" cm"); } } void getTime(){ int timeNow = micros(); Serial.println("Interrupted"); if(isHigh == false){ microsPrev = timeNow; //get time now, pin LOW-&gt;HIGH isHigh = true; Serial.println("Returning .."); return; } else { //pin HIGH-&gt;lOW ledWrite(timeNow - microsPrev); isHigh = false; microsPrev = micros(); Serial.println("Returning .."); return; } return; } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USsherrellbc
    1. USsherrellbc
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POArduino - Using interrupts freezes processing and serial output?
      1. This table or related slice is empty.
      1. VTUpMod
    1. COI actually was just thinking. What happens when an interrupt call is interrupted?
      singulars
      1. POArduino - Using interrupts freezes processing and serial output?
      1. USsherrellbc
    2. COEDIT: So, adding noInterrupts() in both the function called when there is an interrupt event, getTime(), and ledWrite() does not help.
      singulars
      1. POArduino - Using interrupts freezes processing and serial output?
      1. USsherrellbc
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload