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Problems with Serial using interrupts

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I am developing a monitor that will wake up every 15 minutes read and sensor and send some data. I'm using an EXP430G2  onto which I have successfully soldered the 32KHz crystal. The interrupts are working OK, waking every 16 seconds and toggling a LED. I'm using TACTL = TASSEL_1 +ID_3 + MC_2 +TAIE and Timer0-A1.

My problem occurs whenever I try to use either the serial port (using Serial.print) or the AirBooster Pack. Then nothing happens - the system freezes. I'm assuming this has something to do with use of interrupts by the Serial and Airbooster libraries but I have no idea what. 

Any pointers on how to resolve this much appreciated. (Note serial and airbooster work fine when not using interrupts)



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  • 2 weeks later...

Just curious, are you trying to do the Serial.print inside the interrupt?  Somewhere in the documentation it says you shouldn't do that.

What I do, is use and "Event" variable to trigger something time consuming (e.g., Serial writes)  outside of the ISR.  So something like this:

#include "Event.h"

Event SampleTaken;
volatile (datatype)  SampleValue;

   setup/start timer
   print SampleValue;

   Grab SampleValue;




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