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ESP/Xtensa interrupt latency

Posted: Tue Apr 14, 2015 10:58 pm
by mculibrk
Does anyone know what is the interrupt latency of the ESP MCU?

Is there a way to attach/change the interrupt vector for the peripherals (HSPI in this case) directly and
not using the ETS_SPI_INTR_ATTACH(isr_handler, void *)?

I have some time critical ISR processing and I'm getting around 5uS "practical" latency (approx 400 instructions!!!!).

Is this normal?