SPI slave and I2C slave for SAMD51 boards

[jstanle1]

Please implement SPI slave and I2C slave for the SAMD51 and SAMD21 boards. The SPI slave would benefit from being implemented using DMA, as well.

Thanks.

[dhalbert]

It's already implemented, but not turned on on the sAMD21 boards due to lack of space. You could turn it on and turn something else off. It's controlled by the CIRCUITPY_I2CSLAVE value, which you can set in mpconfigboard.mk. E.g., look at ports/atmel-samd/boards/feather_m0_express/mpconfigboard.mk

[dhalbert]

https://circuitpython.readthedocs.io/en/4.x/shared-bindings/i2cslave/I2CSlave.html

[jstanle1]

Dan -- thanks very much for you replies. Any word on whether this might work for the SAMD51 boards?

[dhalbert]

This was indeed tested on SAMD51 boards when the PR was done: #1064 (comment). It is included in the SAMD51 builds.

[jstanle1]

Great, thanks again for the word on ths.