Add Seeed XIAO RP2040 board

[mcauser]

New Seeed board:
https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html

Not sure about this line:

#define PICO_BOOT_STAGE2_CHOOSE_GENERIC_03H 1

It comes with a GD25Q16CEIG - 2MB SPI NAND Flash.

Not sure if that is compatible with W25Qxx used on other boards, and if it should be changed to:

#define PICO_BOOT_STAGE2_CHOOSE_W25Q080 1

[lurch]

It's kinda awkward that you have to go to the wiki page and then look at the schematics to work out what RP2040 pin numbers they've actually used for different things! 😕 But AFAICT the numbers you've used here look correct 👍

[mcauser]

Waiting for my board to arrive so I can test the macros for that GD SPI flash chip.

[kilograham]

it sounds like this is not ready to merge, so i have converted it to a draft

[lurch]

Can you make a similar change to c682e3c please?

[mcauser]

Thanks @lurch, updated

[lurch]

If you're using I2C on pins GP6 and GP7, then that's I2C1 ?

[mcauser]

Thanks @lurch, updated. Pins now match sparkfun_thingplus.h who is also using GP6/GP7 for I2C1

[lurch]

Thanks for the updates. Did you manage to make any progress with testing the "GD SPI flash chip" ?

[mcauser]

I still haven't received a board from Seeed yet, so I can't test.

The adafruit_feather_rp2040.h board also uses (larger) GD flash and they use the same GENERIC_03H config.
Should work but would be better to test it on hardware before merging.

[prplz]

GENERIC_03H and W25Q080 are both working for me on the seeed board.
The flash is actually puya P25Q16H.
Related: adafruit/circuitpython#5519

[prplz]

@mcauser PICO_DEFAULT_LED_PIN should be 25 (the schematic is outdated or something) and you should set PICO_DEFAULT_LED_PIN_INVERTED to 1

[lurch]

@mcauser see #691 - I'll leave it up to you and @ryanplusplus to work out what you want to do 🙂

[lurch]

Sounds like #691 supersedes this PR, so I guess this PR should be closed? 🤷

[kilograham]

closing - reopen if need be