ESP interrupt latency

[uwwint]

Hi there,

I am trying to acheive exactly the same keeping the SPI stream as constant as possible. Was this in the End resolved? And what was the SPI configuration used?

Thanks!

[roc2]

Any information about the latency of peripheral (HSPI) interrupts related to the ETS_SPI_INTR_ATTACH(); API function?

Or what is the interrupt latency in general for the ESP?

cross posted here: http://bbs.espressif.com/viewtopic.php?f=6&t=359#p1323

Best regards,
mculibrk

Hi, mculibrk!
Is your problem solved, and how to solve the problem of interrupt latency? I have the same question when use gpio interrupt ..

[mculibrk]

I'm really sorry for this laaaaate reply...

anyway, regarding int latency...
I was able to solve (kind of) the irq latency of the SPI... this was done by setting an "undocumented" (in newer versions of the header files) register of the SPI. I don't recall the exact one but I can find and post if you really need it.
But, this is specific to SPI... it is a kind of "intercharacter delay" value which is by default set to something. When this value is set to 0 the response is much, much better.

I did not try/tested the latency of the GPIO irq... and I really doubt that there will be a similar register to "tweak" to get faster response.

What numbers are you seeing? What's the gpio irq latency you observed?
Are you using irqs directly or by some API/default handler?

regards,