Variable PWM PIC18F2431

[BigWumpus]

I can't see any 100nF-Cs round your PIC - is he resetting ? You can use a portpin to see it!
Maybe it will better the AD-Converter by filtering his AVDD via 56 Ohm and 100nF against ground, but this is not the reason for your problem.

The INTHIGH-routine starts the AD-conversion on every Interrupt, because the bit-check is faulty (or not complete).

For PIC18-uCs: Writing to a port (PORTA) is better done by writing to the LAT-register instead of a PORT-register.

[trr1985]

Hi guys, I have modified my code, I removed PWM interrupt, and now Im using ADC interrup, in Continuous Loop mode each time that ADC do a conversion Interrupt is generated when the 2nd and 4th words are written to the buffer, in the interrupt service routine I load the ADC result to Duty Cycle register, I did some test using a pot, now my ADC is working correctly, 0.5 V = 10% Duty Cycle in PWM, so 5 Volts = 100 % Duty Cycle PWM, Im loading the 10 ADC result bits to 10 resolution bits from PCPWM (duty cycle registers), Im using Digital Scope, when I get the PWM output the signal stay some seconds, after I luse the PWM signal, after some second the signal come back, after the signal down, after back, etc...
Im getting the correctly variable PWM output but the signal isnt constant, and its not good to use in a DC-DC converter, I need dont luse my PWM output.
I think the ADC interrupt is the trouble because I luse the PWM output, I hope u can help me guys thank for ur help and time.
I have uploaded my new code.

Regards.
Tom.

[trr1985]

Im back from university, I get new results, The A/D module is working fine I tested it loading the ADC result to a port C and A from pic, I used a led bar (10 leds) to check it, when I tested in PWM it work fine load the correctly value to duty cycle register, if I load 2.5 Volts in analog input, I get 50% from duty cycle in PWM output signal, my trouble now is that my signal is flickering a lot, some times stay some value for some seconds and after load other value, I think that FIFO buffer from ADC is doing wrong some thing, I changed my code today, Im using PWM interrup each time that PTMR match PTPER start the Hight priority interrupt routine service, in this interrupt service Im reading and loading the ADC result to duty cycle registers, I have attached my new code here, I have disallowed ADC interrupt.

I hope someone can help me, thanks.

Regards.