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I understand I really need a training on PIC programmation. Because the moment you mention using timers, I'm scared.
Also right now the 4 PWM output are used to drive some LEDs.

Long story short, ...

Well thanks for the comments but
- I have to work with this hardware, redesigning is not possible
- would PWM allow me to vary linearly vary the frequency at high speed? I don't want a stable pwm

THe PIC runs at 20MHz.
I want to program a trapezoid stepper command (with customisable ramp up and ramp down) that can run on 2 different motors (hence the original variable for the PIN).

Hello, I'm trying to speed up a loop in charge of generating pulses to a stepper motor. The goal was to achieve 6ms for one loop on a 18F6722.
I started from this
int32 step;
int16 ramp;
int16 del ...

End of the story: I received a new batch of PICs, replaced them and the failure is gone! Looks like brokers got us a batch of bad pics

@PCM first thing I did was to update to compiler v5.109, but I have not tested disabling optimisations yet, that was on my todo list
@Prince: although the issue occurrence is random, it is indeed alm ...

@PCM: I'm testing your program right now, no problem so far (but since no RDA interrupts are generated, I don't expect the bug to occur)

I confirm our 5Vdc voltage is stable, the 4 pins are connect ...

Over RS232 back to the PC.
Maybe I should have explain that before the bug occurs I have 3000 working cycles, and for each cycle maybe 30 printf that do work properly.

I've ran a new test that printed only 2 characters in order to avoid adding enough delay to prevent the bug to appear:
BOOLEAN startsWith(char *txt, char *toCompare)
{
int8 size = ...

@PCM Programmer: I cannot carefully check that before next Monday

On the other hand, I confirm that with the additional printf, the bug won't appear within 15k cycles when it is usually guaranteed ...

Ok, so I've tested a few modifications in the past days.
So far nothing prevented the bug to appear:
- changing int16 for int8 in startsWith()
- replacing getc() with fgetc(UART1)
- removing #inli ...

Ok, I'll try to print the buffer content when the comparison returns TRUE (my problem is that on the PC side, the software will be spammed with messages, and not only I need to handle this, but it cou ...

Thanks to all who took time to answer!

Ok so you think the startsWith() function cannot get corrupted by an interrupt?

#use rs232(stream = UART1, baud = baudrate, bits = 8, parity = N, xmit ...

My PIC is a 18F6722
Regarding a reproducer it is going to be quite difficult, because the PC side sending commands over RS232 is needed.

However I'm almost sure that it has to do with the #INT_RDA ...

I'm chasing a bug that appears sporadically after hours of operations: some portion of code gets called when it should not.

Using the ICD debugger I was able to narrow it down to a section processi ...