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Sub Jiffy(10ms) interrupts

Question asked by Dan Mendelsohn on Jul 29, 2011
Latest reply on Aug 11, 2011 by Dan Mendelsohn

Hi, Im am relatively new to microcontroller programming and I am trying to find a way to do sub jiffy(10ms) intrupts. We are currently running a linux kernel on the M54451EVB and are attempting to create interrupts that are in the microsecond range. We need this in order to implement DMX, which requires 4uS between signals. We have tried udelay and ndelay, but can not get enough accuracy for what we need. We also want to be able to interrupt, not just delay. We are guessing that we just need to be able to implement one of the 4 PIT timers on the MCU but are unsure how to go about this. Does anyone know how we can get sub Jiffy interrupts?