I2C/SPI Combined Driver

[FoamyGuy]

This relies on the changes from: adafruit/Adafruit_CircuitPython_Register#59 So that should be merged before this is.

Adds SPI support by using new functionality pending addition to adafruit_register

This should be a major version bump if merged because the class name changed from the bus specific BMP5XX_I2C to the now generic BMP5XX.

The bus type gets determined by whether spi and cs or i2c are passed to the constructor. Everything gets handled externally and code that using the driver has the same API after the BMP5XX class is created.

Internally the command and chip_id register descriptors were changed from UnaryStructs to RW/RO Bits. This was because the (Register_SPI)[https://github.com/adafruit/Adafruit_CircuitPython_Register_SPI] classes that I started from only had Bit and Bits implemented, no Struct(s). The change doesn't make any difference in the API.

I tested both I2C and SPI examples successfully on Adafruit CircuitPython 10.0.0-beta.3 on 2025-08-29; Adafruit Feather RP2040 with rp2040

[FoamyGuy]

Note: this should bump to 2.0.0 when released because the class name change from BMP5XX_I2C -> BMP5XX will cause old code using new library to break.

[tannewt]

Let's hash out the new constructor args here first: adafruit/Adafruit_CircuitPython_SPA06_003#1

[FoamyGuy]

@tannewt this branch is updated with the same API that we settled on for the SPA06 now.

[tannewt]

Looks good! Thank you!