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1. 

   Darth Maker
   Member

   Can someone try this code? For some reason, pin 24 wont output PWM for me.

   void setup()
   {

   pinMode(5, PWM);
   pinMode(9, PWM);
   pinMode(14, PWM);
   pinMode(24, PWM);

   analogWrite(5, 0);
   analogWrite(9, 0);
   analogWrite(14, 0);
   analogWrite(24, 0);

   analogWrite(5, 65535/2);
   delay(2000);
   analogWrite(5, 0);
   delay(1000);
   analogWrite(9, 65535/2);
   delay(2000);
   analogWrite(9, 0);
   analogWrite(24, 65535/2);
   // digitalWrite(24, HIGH);
   delay(2000);
   analogWrite(24, 0);
   // digitalWrite(24, LOW);
   delay(1000);
   analogWrite(14, 65535/2);
   delay(2000);
   analogWrite(14, 0);
   toggleLED();

   while(1);

   }

   void loop();

   I tested the pin with the digitalWrite(), but that worked fine. Is there some firmware problem with PWM24?

   Posted 5 years ago #
2. 

   Darth Maker
   Member

   I didn't actually use setup() and loop(), and I didn't test it using those, but this will work the same as the code that I used. I just had main() (and thus no setup() and loop(),) and that was the only difference.

   Posted 5 years ago #
3. 

   MessiahAndrw
   Member

   Perhaps you've change or disabled timer 4 that PWM pin 24 is associated with? If not you, maybe the bootloader has?

   Try calling before the rest of your code:
   Timer4.setChannel4Mode(TIMER_PWM);
Timer4.setOverflow(65535);
Timer4.setPreScaleFactor(1);
Timer4.resume();

   If it works then I suspect timer 4 is used for something in the bootloader.

   Posted 5 years ago #
4. 

   poslathian
   LeafLabs

   were you running from inside the IDE? main is already defined for you in the background when using the ide...it looks something like (much as you might expect):
   // Force init to be called *first*, i.e. before static object allocation.
   // Otherwise, statically allocated object that need libmaple may fail.
   __attribute__(( constructor )) void premain() {
   init();
   }

   int main(void)
   {
   setup();

   while (1) {
   loop();
   }
   return 0;
   }

   so you probably would have gotten a compiler error for the redefinition, so I suppose youre using libmaple from the command line...?

   also that other junk in main and premain, setup() and init() are important! stuff wont work without it.

   whats your setup like?

   Posted 5 years ago #
5. 

   Darth Maker
   Member

   Poslathian, I'll refer you too this thread:
   http://forums.leaflabs.com/topic.php?id=583
   I removed just the main() function from the main.cxx file, and I can then write my own. init(); is still called, but setup() (and loop()) is not a required function.

   Thank you for your help MessiahAndrw, adding that code indeed worked. (Minus the extra capital "s".) Actually, the line that made it work is the first one:

   Timer4.setChannel4Mode(TIMER_PWM);

   I'm going to take a look at the hardware files for the PWM functions and see if I can find the reason PWM24 didn't work but the others did.

   Posted 5 years ago #

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