[Gumstix-users] third PWM on a Robostix

[Chris S. <chr...@gm...>]

Dave and company

I'm trying to get 3 PWMs working from the gumstix on the robostix.
I've got two, but the Atmel PWM controller is a nightmare.

This is what I have so far for 1A and 3C.
All of the PWM pins are output enabled.

But the Atmel timers are all intertwined.  They are wierd.
I just want another square wave at about 1000Hz.
Anything simple that I'm missing?

Chris

       int tccr1a =3D (1 << COM1A1) | (0 << COM1A0) // ChanA,
non-inverting PWM, 244.14 Hz
               | (0 << WGM13) | (0 << WGM12)
               | (0 << WGM11) | (1 << WGM10);  // PWM, Phase Correct, 10-bi=
t;
       int tccr1b =3D (0 << WGM13) | (1 << WGM12)
               | (1 << CS22) | (0 << CS21) | (0 << CS20); // prescale =3D 6=
4

       int tccr3a =3D (1 << COM3C1) | (0 << COM3C0) // ChanC,
non-inverting PWM, 976.5625 Hz
               | (0 << WGM33) | (0 << WGM32)
               | (0 << WGM31) | (1 << WGM30);  // PWM, Phase Correct, 10-bi=
t
       int tccr3b =3D (0 << WGM33) | (1 << WGM32)
               | (0 << CS22) | (1 << CS21) | (1 << CS20); // prescale =3D 8
       int8_t  tt;

       // Init Timer 1 for Steering PWM 1A
       WRITE_REG8(TCCR1A, tccr1a);
       WRITE_REG8(TCCR1B, tccr1b);
       WRITE_REG16(OCR1A, STEERING_MIDDLE);

       // Init Timer 3 for Motor PWM 3C
       WRITE_REG8(TCCR3A, tccr3a);
       WRITE_REG8(TCCR3B, tccr3b);
       WRITE_REG16(OCR3C, SPEED_OFF);