On 20/06/2022 00:32, chris wrote:
Don't really understand what's meant by "input capture timer" ?. Is that related to some polling method, or what ?...
I believe they mean a hardware clock, that can be read directly by the software, and is also latched into a register when the PPS signal arrives. A variation might be to start a hardware timer when the PPS arrives, again making it directly readable.
Also, whilst NMEA is low priority, I suspect it is not uncommon to have its generation scheduled at the PPS time, making it much closer to the last PPS than the next.
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