Use GPIO API from IRAM ISR

[dejan.ns]

I am writing a OneWire protocol handling task and I am using a timer ISR with IRAM attribute set to achieve precise timing (order of uS) needed to handle One Wire protocol.
Can I use regular GPIO API functions inside IRAM ISR?
If not, how can I read, write and change direction of the GPIO (on the fly, from input to output and vice versa) by accessing the ESP32 registers directly?

[WiFive]

https://github.com/DavidAntliff/esp32-owb

[ESP_igrr]

https://github.com/mongoose-os-libs/one ... wire_rmt.c