Hi Marc, On Wed, Sep 28, 2011 at 10:05:31PM +0200, Marc Balmer wrote: > Marc....
sorry :-D > > On Sun, Sep 25, 2011 at 11:42:11AM +0200, Marc Balmer wrote: > > I'd like to be able to set the PWM indepentently for each pin! say > > specifying > > 70/256 on and otherwise off. > > That is what gpiopwm(4) is for. > > > gpiopwm(4) can be grouped on pins that needs synchronisation. Say gpiopwm0 @ > > gpio0 has pins 3, 5, 7 with each their pwm's but synchronised on 'on' or > > 'off' > > and gpiopwm1 @ gpio0 has pin 2 and 8. As they are synchronised all the pins > > attached can be programmed at one go preventing arbitrary races. > > How can you sync if the pins have different duty cycles? Well they could all start at the same time, say a pin0 @ 70/256 and a pin1 @ 45/256 can start both at t=0 and pin1 dropping at t=44 and pin0 dropping at t=69 and both keeping low until t=256. The base duty cycle will then be the same for say a gpiopwm0, only different portions of the time on/off for the pins connected to gpiopwn0. Is this more clear? With regards, Reinoud
