a driver for the Pericom PI4IOE5V6408 I2C GPIO extender;

[easytarget]

I have a ESP32-P4 board (M5Stack Tab5) which uses two PI4IOE5V6408 I2C GPIO extenders for some internal power management, sense and reset pins. I want to run vanilla 1.27.0 on this board, rather than the slightly random and old ports I find online, but without control of these IO pins I was dead in the water.

So I sat down and wrote a full driver for this chip:
https://codeberg.org/easytarget/pi4ioe5v6408-micropython

With this you can (say) enable the WLAN co-processor with:

from machine import I2C, Pin
from pi4ioe5v6408 import PI4IOE5V6408

sys_i2c = I2C(sda=Pin(31), scl=pin(32))

# Create the GPIO chip object
U7 = PI4IOE5V6408(sys_i2c, 0x44)

# C6 co-processor power control (WLAN_PWR_EN) is on pin 0 of U7
U7.set_output(0,1)

The official toolchains, and the UiFlow (micropython 1.25 based) code have binary blobs added to init and other functions to enable and disable things like the WLAN co-processor, usb power, battery charging etc. I want to sidestep all that and use a vanilla official release starting with 1.27.0 (the first release with official esp32-p4 support).

This driver is full featured, it supports directionality, impedance, bias, interrupts and some debug. See the README for full usage and operation details. I think it is quite well written, I could not find any existing python examples for this device, so I wrote this from scratch using just the datasheet and my Tab5 to experiment on.

I am using this as the basis for a Tab5 'power gpio' library to give simple access to all the 'hidden' gpio toggles on the Tab5, and also documenting as much as I can, it's still a bit Work In Progress. See Here:

[Josverl]

Great work. I think that MicroPython based drivers are often preferable over C(pp) based ones if speed is not the constraint.

To make it simpler to install you might want to add a section to your readme to install using mpremote MIP
I think that should work with mpremote MIP install https://codeberg.org/easytarget/pi4ioe5v6408-micropython/raw/branch/main/pi4ioe5v6408.py but can't verify right now.

[easytarget]

Thank you, I agree, especially for this kind of simple driver pure micropython solutions are more 'elegent', easier to use and easier to comprehend.

Edit: I've put the mip and mpremote mip install instructions in there now.

[sosi-deadeye]

A Christmas present :-)