http://forums.leaflabs.com/topic.php?id=609 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:24:49 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=609#post-3350 Wed, 12 Jan 2011 17:49:49 +0000 bart_dood 3350@http://forums.leaflabs.com/ <p>Hi Folks,</p> <p>I am pretty new here, I'm working on a motor driver application on the maple and have a question about interrupts and timers.<br /> My app requires 3 external pin interrupts (however these always call the same function) when a change is detected high/low or low/high.<br /> It also has 2 timed interrupts, one runs at 10khz (so 100 microseconds) and the other runs at 20hz (50,000 microseconds).<br /> My code is as follows for the setup:</p> <p>// external interrupt setups for hall sensor detection</p> <p> attachInterrupt(10, calcposition, CHANGE); // on change of state of pin 10, run calcposition function<br /> attachInterrupt(11, calcposition, CHANGE); // on change of state of pin 11, run calcposition function<br /> attachInterrupt(12, calcposition, CHANGE); // on change of state of pin 12, run calcposition function </p> <p> // internal interrupt setups for timing syncs etc, use Timer 4 which is associated with pins 5, 9, 14, 24. Should avoid conflicts. Is used for 10khz interrupt</p> <p> Timer4.setChannel1Mode(TIMER_OUTPUTCOMPARE);<br /> Timer4.setPeriod(100); // timer period in microseconds, 100 is equal to 10khz<br /> Timer4.setCompare1(100); // overflow might be small<br /> Timer4.attachCompare1Interrupt(torqueloop); // when the interrupt triggers run the function torqueloop</p> <p> // internal interrupt setups for timing syncs etc, use Timer ????</p> <p> Timer3.setChannel1Mode(TIMER_OUTPUTCOMPARE);<br /> Timer3.setPeriod(50000); // timer period in microseconds, 50000 is equal to 50 milliseconds or 20hz<br /> Timer3.setCompare1(50000); // overflow might be small<br /> Timer3.attachCompare1Interrupt(checkparms); // when the interrupt triggers run the function checkparms</p> <p>I have timer 4 on the 10khz interrupt as I am using pins 6, 7 and 8 as PWM output pins. I have timer 3 on the other timed interrupt.</p> <p>Should I set the overflow figure (I presume it is in microseconds??) to the same value as the interrupt timer value? as shown above.</p> <p>Does this look right? any insight is appreciated, I am new to using interrupts but my code absolutely has to have them.</p> <p>Thanks! </p>