We' d like to use MCP23S17 for High frequency pulse input ex. 1kHz.
But performance is NG, max.10-20Hz now.
How can we solve it?
I would suggest to check SPI speed,
I assume you use 1 ms to work with the values (the task which are working with the IO's in CODESYS - maybe a tried is to do > 1ms - but not sure if this works?
Additional you need to set the CPU speed of the Cores to a fix value,
because by default they are floating and this influences the SPI speed to - this had
reported another user I think here in the forum/talk
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