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Timing-Jitter on gpio output when LCD is active.

Question asked by Beck.Karl_Michael on Mar 8, 2017
Latest reply on Mar 13, 2017 by Beck.Karl_Michael

Hi guys,


we have a problem here. We run a Stm32F469BITx at 180 Mhz. There is a lcd display and a realtime process included. The realtime process creates GPIO-Pin-Changes in Mikrosecond intervalls. The problem is that we have a timing jitter of about 6us. The realtime process has highest prio, even we disable interrupts now while it is pending. Although the jitter occurs. When we disable the display the jitter goes < 1 us.


So definitiely no interrupt during the realtime process. Where could the jitter come from?


Thanks for your thoughts.