esp32/machine_pin: Add mode and pull in machine_pin_print() as repr() function.

[IhorNehrutsa]

Test code is:

from machine import Pin
pin = Pin(22, mode=Pin.IN, pull=Pin.PULL_UP)
pin

Output is:

Pin(22, mode=1, pull=2)

instead of

Pin(22)

The main advanteges:
This PR allows to serialize Pin object to str and restore the Pin object from the string:

pin2 = eval(str(pin))
pin2

Output is:

Pin(22, mode=1, pull=2)

[IhorNehrutsa]

@jimmo
Could you give your opinion about this PR?

[jimmo]

Thanks @IhorNehrutsa -- I can definitely see that adding this information to the print output is useful for debugging, and making the pin serialisable is certainly a nice bonus.

However, there are two main concerns:

1. We don't ensure that the pins can be eval'ed on other ports. For example, on rp2040:

>>> machine.Pin.board.D12
Pin(GPIO4, mode=ALT, pull=PULL_DOWN, alt=31)

It's quite useful (for debugging) that it prints the mode strings rather than the numbers too. (I guess you could in theory make this work with eval with the right combination of globals passed to eval).

2. It's not a trivial decision to dedicate ~90 bytes (2 uint8_t * ~45 pins) of RAM just to tracking this state. 90 bytes isn't much, but I don't know if it justifies this? I was quite surprised to find that the IDF doesn't provide a way to extract this information from a pin, but that definitely seems to be the case in both the driver and HAL.

What if we turned machine_pin_obj_cfg_t into a bitfield (3 bits for gpio_mode_t, two bits for gpio_pull_mode_t). Then it would be only 45 bytes?

[IhorNehrutsa]

I opened the ESP-IDF issue:
GPIO feature: Add gpio_get_direction() and gpio_get_pull_mode() (IDFGH-10987) #12176

[IhorNehrutsa]

Function gpio_dump_io_configuration()
Dump IO configuration information to console.

Commit espressif/esp-idf@321f628
feat(gpio): add a dump API to dump IO configurations

[IhorNehrutsa]

        bool pu, pd, ie, oe, od, slp_sel;
        uint32_t drv, fun_sel, sig_out;
        gpio_hal_get_io_config(gpio_context.gpio_hal, gpio_num, &pu, &pd, &ie, &oe, &od, &drv, &fun_sel, &sig_out, &slp_sel);

[IhorNehrutsa]

feat(gpio): add a dump API to dump IO configurations (IDFGH-11366)
espressif/esp-idf#12511
Cherry pick from master to release/v5.1

[projectgus]

This is an automated heads-up that we've just merged a Pull Request
that removes the STATIC macro from MicroPython's C API.

See #13763

A search suggests this PR might apply the STATIC macro to some C code. If it
does, then next time you rebase the PR (or merge from master) then you should
please replace all the STATIC keywords with static.

Although this is an automated message, feel free to @-reply to me directly if
you have any questions about this.

[dpgeorge]

Now that esp32 port uses IDF 5.2.2, are the required IDF functions available to retrieve the GPIO state?

Also, would be nice to print the string of the mode/pull, rather than just the integer (like the rp2 port does).

[github-actions]

Code size report: