External interrupt while going to sleep withADXL345ends in"endless wait"[solved]

Projects Programming
1

Hey guys,

I hope you can help me solving the subjects problem.

The Sensor is configured to do an interrupt to wake up the arduino --> set pin to HIGH until interrupt is cleard. The last interrupt is cleard and new started right before going to sleep, but if there is a new interrupt while dropping off, the arduino won't come back anytime.
Is there a solution to get around this?

#include <Wire.h>
#include <ADXL345.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

ADXL345 adxl; //variable adxl is an instance of the ADXL345 library

void setup(){
  Serial.begin(115200);
  
  pinMode(13, OUTPUT); 
  pinMode(2, INPUT);      // Make digital 2 an input


//set up sensor
  adxl.powerOn();

  //set activity/ inactivity thresholds (0-255)
  adxl.setActivityThreshold(20); //62.5mg per increment
  adxl.setInactivityThreshold(20); //62.5mg per increment
  adxl.setTimeInactivity(10); // how many seconds of no activity is inactive?
  adxl.setDoubleTapLatency(80); //1.25ms per increment
  adxl.setDoubleTapWindow(200); //1.25ms per increment  
 
  //look of activity movement on this axes - 1 == on; 0 == off 
  adxl.setActivityX(1);
  adxl.setActivityY(1);
  adxl.setActivityZ(1);
 
  //look of inactivity movement on this axes - 1 == on; 0 == off
  adxl.setInactivityX(1);
  adxl.setInactivityY(1);
  adxl.setInactivityZ(1);
 
  //look of tap movement on this axes - 1 == on; 0 == off
  adxl.setTapDetectionOnX(1);
  adxl.setTapDetectionOnY(1);
  adxl.setTapDetectionOnZ(1);
 
  //set values for what is a tap, and what is a double tap (0-255)
  adxl.setTapThreshold(20); //62.5mg per increment
  adxl.setTapDuration(200); //625?s per increment
  
  //set values for what is considered freefall (0-255)
  adxl.setFreeFallThreshold(7); //(5 - 9) recommended - 62.5mg per increment
  adxl.setFreeFallDuration(45); //(20 - 70) recommended - 5ms per increment
 
  //setting all interupts to take place on int pin 1
  //I had issues with int pin 2, was unable to reset it
  adxl.setInterruptMapping( ADXL345_INT_SINGLE_TAP_BIT,   ADXL345_INT1_PIN );
  adxl.setInterruptMapping( ADXL345_INT_FREE_FALL_BIT,    ADXL345_INT1_PIN );
  adxl.setInterruptMapping( ADXL345_INT_ACTIVITY_BIT,     ADXL345_INT1_PIN );

  //register interupt actions - 1 == on; 0 == off  
  adxl.setInterrupt( ADXL345_INT_SINGLE_TAP_BIT, 0);
  adxl.setInterrupt( ADXL345_INT_DOUBLE_TAP_BIT, 0);
  adxl.setInterrupt( ADXL345_INT_FREE_FALL_BIT,  0);
  adxl.setInterrupt( ADXL345_INT_ACTIVITY_BIT,   0);
  adxl.setInterrupt( ADXL345_INT_INACTIVITY_BIT, 0);
  
}

void sleepNow()         // here we put the arduino to sleep
{
  Serial.println("off");
  digitalWrite(13,LOW);
  delay(100);
  set_sleep_mode(SLEEP_MODE_PWR_DOWN);   // sleep mode is set here
  sleep_enable();
  attachInterrupt(0, wakeUp, CHANGE);
  byte interrupts = adxl.getInterruptSource();  //read and clear interrupt
  //start sensor doing interrupts
  adxl.setInterrupt( ADXL345_INT_SINGLE_TAP_BIT, 1);
  adxl.setInterrupt( ADXL345_INT_DOUBLE_TAP_BIT, 1);
  adxl.setInterrupt( ADXL345_INT_FREE_FALL_BIT,  1);
  adxl.setInterrupt( ADXL345_INT_ACTIVITY_BIT,   1);
  sleep_mode();
  sleep_disable();         // first thing after waking from sleep:
  detachInterrupt(0);
}

void wakeUp()
 {

 }

void loop(){

//going to sleep
  sleepNow();  
  Serial.println("on");
  digitalWrite(13,HIGH);
 
// stop sensor-interrupt
  adxl.setInterrupt( ADXL345_INT_SINGLE_TAP_BIT, 0);
  adxl.setInterrupt( ADXL345_INT_DOUBLE_TAP_BIT, 0);
  adxl.setInterrupt( ADXL345_INT_FREE_FALL_BIT,  0);
  adxl.setInterrupt( ADXL345_INT_ACTIVITY_BIT,   0);
  adxl.setInterrupt( ADXL345_INT_INACTIVITY_BIT, 0);  
  
//DOING STUFF HERE
  
}

Best gegards
Eicca

2

Somebody else had a similar problem, and fixed it, here: Pin and timer interrupt in same program - Programming Questions - Arduino Forum. Maybe that solution will work for you, too.

3

Thanks, but it didn't solve the problem. The interrupt could occur still while going to sleep.
I have modified the configuration of the sensor, so the interrupt can occur earliest 200ms after starting - and after this time the arduino is sleeping definitly (hope so), so the interrupt will wake up the board.

4

My last try did not solve the problem but reduce its appearance.

Finaly solved this (hope so) with disabling interrupt through double-tab. I don't know why this is the key.