On Fri, Jul 18, 2014 at 4:01 PM, Bruce Dawson <j...@codemeta.com> wrote:
> Thanks for replying Thomas! > > Basically, I need to store the time (to the sub-nanosecond) on the first > serial interrupt. (Don't need it for every byte, just the first in a > stream.) > > I'm not really interested in speeding up the UART code or serial > transfer; I just need to know *exactly* when the first byte comes in (or > goes out). > Oh, in that case, it's much easier. The UART drivers allow for 'sub drivers'. I actually had an example I used for such a thing bookmarked: http://www.cs.fsu.edu/~baker/devices/lxr/http/source/linux/drivers/serial/uartlite.c I don't know if you'll find it helpfull, but it's a functioning example which is relatively strait forward.
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