sending PWM with olinuxino maxi to motor shield?

Started by omav, November 14, 2012, 03:14:39 PM

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I am currently working on a small vehicle, which has a motor shield to control the motors. I'm using the olinuxino maxi to send PMW signals to the motorshield, however, this seems to not work very well. Checking with an oscilloscope, it seems the PWM signal is often interrupted or delayed, causing the motorshield to ignore the signal (since it doesn't look exactly like a PWM signal anymore I guess).

Quick testing with an arduino does work well together with the motorshield. Could this be a problem of linux' lack of realtime interfering with the signal? or might I be missing something?


How are you controlling the iMX233 PWM pins from Linux?