Help with PWM on dsPIC 30f2010

[briantlam]

I am relatively new to programming microcontrollers. I started with the dsPIC development kit and am trying to produce a PWM. What I am trying to do is produce a PWM where the duty cycle is adjusted by the pot. I was able to setup the ADC and read the value through RS232. I've had no luck setting up the PWM.

I've tried using:

setup_capture()
set_pwm_duty()
setup_power_pwm()
setup_power_pwm_pins()
set_power_pwm_duty()

but the complier doesn't seem to recognize these functions. I'm not sure if I'm missing header files or something else. Any help will be greatly appreciated. Working sample code will be appreciated even more.

Thanks.

[PCM programmer]

See the Ex_PWM.c example file. It's in this directory:

[briantlam]

I looked at that code and came up with some for my device. The code compiles but I do not get an output on the PWM pins. Here is my code:

#include <30F2010.h>
#fuses HS,NOWDT
#use delay (clock=20000000)

int16 duty=32768;

void main()
{
setup_timer3(TMR_INTERNAL);
set_pwm_duty(2,adc_reading);
setup_compare(2,COMPARE_PWM);
}

[PCM programmer]

That doesn't look like a simple PWM test program. Also, it doesn't have
a while(1) statement at the end. Without that, the PIC will go to sleep
and PWM will stop. Also, you have a variable called 'duty' but you don't
use it in the program.

Basically, you need to make a small, simple, complete PWM test program.
Don't try to use any advanced features at this time. Just get PWM running.

[briantlam]

Sorry, I made some edits before copying over to this post. Here's the code I am using now, which still doesn't work.

#include <30F2010.h>
#fuses HS,NOWDT
#use delay (clock=20000000)

int16 duty = 32768;

void main()
{
while(TRUE)
{
setup_timer3(TMR_INTERNAL);
setup_compare(2,COMPARE_PWM);
set_pwm_duty(2,duty);
}

}

[PCM programmer]

I didn't mean put it in a while() loop. I meant put a while(1) statement
at the end of main() by itself, to prevent the user program from hitting
the hidden sleep instruction that CCS puts there. Example:

[briantlam]

Here the new code that still doesn't work:

[PCM programmer]

I don't have the PCD compiler. I will have to download the demo to
work on this. Basically, all I can do is look at the .LST file to see if
the CCS functions are setting up the PWM module according to the
30F2010 data sheet.

[ozzy_dm]

[ozzy_dm]

[PCM programmer]

They have substituted a new function, called "setup_compare()", but
it doesn't appear to be described in the current PCD manual.

[Storic]

I get errors trying to get a PWM from the 24FJ64GA004 micro with the PWM example.

*** Error 108 "EX_PWM.c" Line 159(48,49): Invalid parameters to built in function :: Invalid Pin

*** Error 108 "EX_PWM.c" Line 169(35,37): Invalid parameters to built in function :: Invalid Pin

This has been reported to CCS, as extracted from my email reply

[Guest]

[Storic]

example in EX_PWM.c
for PCD Look at the example after the "#else"

[Ormiga]