From: Terry Frederick <terryf@cu...> - 2005-07-22 05:07:44
Thanks for the code sample Jonathan. I'm sure it will help a bunch. I just
read in the PXA255 manual that the minimum requirement for edge detection
for interrupt is 1us, so it looks like you're right on the latency. I'll
have to settle for something slower. Disappointing. An external hardware
buffer and then using a faster interface is a good idea, but my timeframe is
too short for this phase of the project. I'll have to make do.
From: Terry Frederick <terryf@cu...> - 2005-07-22 18:36:39
>You can setup the DMAC to copy data from GPIO to memory.
>But in order to synchronize transfers with your 1-bit signal,
>you'd need to feed it into DREQ0/DREQ1 (aka GPIO19/GPIO20).
>Unfortunately these signals are not available on any of the
>Hirose connectors. Does the Gumstix use them internally ?
Before you posted this, I had hunted for this capability in the reference
manual last night, and didn't find anything. Now that I know it's there
I'll look again. Thanks. By the way did you get your sensor working?
I second the question about the DREQ0/DREQ1 (aka GPIO19/GPIO20). Does
anyone know if the gumstix uses these internally?
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