IRQ SPEED

[georges]

Hi,
I am new to micropython.
I plan to use an ESP32 board to control a little robot.
It is a simple mobile platform with two wheels and a few sensors.
It use two DC motors with encoders.
The encoders generate pulse at about 5 Khz each.

Do we have experience if the External IRQ is able to follow these frequency ?
My function is very short : only increment a counter.

Does anybody have any experiences about it ?

Best regards
Georges

[Roberthh]

Using ESP32 for that purpose will be no joy. The esp32 has bad IRQ latency between 20 and 400 µs. That is caused mainly by the code being stored in serial flash and cached in to the address space. On a cache miss, you will have a large latency. Better use the PyBoard.

[OutoftheBOTS_]

The STM32 MCUs of the PYBoard also have hardware encoder counters on their timers.