Making the initialization of MCP23017 class optional?

[postal]

Adafruit_CircuitPython_MCP230xx/adafruit_mcp230xx/mcp23017.py

Line 65 in 31b5825

# Reset to all inputs with no pull-ups and no inverted polarity.

I have connected an MCP23017 to my Raspberry Pi. During reboot the MCP23017 is used to configure the inputs, outputs and pullup resistors. If I use the library afterwards, the configuration is reset when the class is initialized.

Is there a way to bypass the initialization?

[evaherrada]

Maybe try something like what's discussed here:
https://stackoverflow.com/questions/38010391/share-python-objects-between-two-or-more-py-files

[tannewt]

I'd suggest we add a reset=True kwarg that can be used to disable the reset on startup. This will be needed when CircuitPython can deep sleep and therefore the code.py runs from scratch each time.

[evaherrada]

@tannewt Ok, I'll take a look at doing that

[evaherrada]

hi @postal Can you share the code you're using? I'd like to be able to test this with that exact code so I can be sure what you're trying to do will work.

[postal]

hi @dherrada, this is the script which is executed by cronjob after a restarting the Pi, to setup the mcp23017.

`#!/bin/bash
echo "setup all gpio on bank A to output (0x00)"
sudo i2cset -y 1 0x20 0x00 0x00
sudo i2cget -y 1 0x20 0x00

echo "setup all gpio on bank B to input (0xff)"
sudo i2cset -y 1 0x20 0x01 0xff
sudo i2cget -y 1 0x20 0x01

echo "setup pullup resistors on bank B (0xff)"
sudo i2cset -y 1 0x20 0x0D 0xff
sudo i2cget -y 1 0x20 0x0D
`

All these settings are reset when the library is initialized.

[evaherrada]

@postal Great. Thanks. I'll load this on my pi and try to add the reset keyword

[JuliaHorvath]

@dherrada Hey, I am having the same problem. Did you find any solution yet? :)

[evaherrada]

@JuliaHorvath Hey. I don't think I ever ended up getting to it. Is there a way to set those settings after the library has been initialized? If there is, that would probably be a pretty simple workaround.

@tannewt Is this still something you think I should do? If so, I can add to my list

[tannewt]

@dherrada Yup! We should still do it. We actually have sleep support now so this will be even more useful.

[ladyada]

@JuliaHorvath @postal can ya try the PR ?

[jposada202020]

@JuliaHorvath @postal Let me know if you tried the PR. I think we are good to close this issue. Thanks.