Hello Benj,
I tried several tests tonight.
First , I removed Interrupt on Timer0, keeping the interrupt of Timer1 on external clock RC0. No change, motor left affected, reversed.
Second, I put back the 2 interrups, on both timers, but both on internal clock at 2441 Hz, motor left affected.
3rd test, Timer0 only, still internal clock at 2441Hz, both motors forward, flashing led OK.
Going this way, I went back to simulation, at least I can see what's happening on the pwm outputs.
Program with interrupt on Timer0 only, internal clock, pwm1 = pwm2 = 62%
Program with interrupt on Timer1 only, internal clock, pwm1 = pwm2 = 62%, except every 2 seconds or so (display), pwm going 31% on both pwm.
Still puzzled. Have you got any idea ?
I attached the 2 test programs corresponding to the upon simulations, if you could have a look.
Thanks