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Trinket M0: No SPI pins in board #213

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deshipu opened this issue Aug 30, 2017 · 6 comments
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Trinket M0: No SPI pins in board #213

deshipu opened this issue Aug 30, 2017 · 6 comments
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@tannewt
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@deshipu
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deshipu commented Aug 30, 2017 •
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Trying to run any of the SPI examples, I get:

>>> spi = busio.SPI(clock=board.SCK, MOSI=board.MOSI, MISO=board.MISO)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'SCK'

Changing this to:

spi = busio.SPI(clock=board.D3, MOSI=board.D4, MISO=board.D2)

makes it work, but then I have to write board-specific code.
@deshipu deshipu changed the title trinket mo -- no SPI pins in board Trinket m0: No SPI pins in board Aug 30, 2017
@deshipu deshipu changed the title Trinket m0: No SPI pins in board Trinket M0: No SPI pins in board Aug 30, 2017
@tannewt tannewt self-assigned this Aug 30, 2017
@tannewt tannewt added this to the 2.0 milestone Aug 30, 2017
@tannewt
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tannewt commented Aug 30, 2017

How does it work when there is no chip select line? Isn't that usually used to signify transaction boundaries?

@deshipu
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deshipu commented Aug 30, 2017

No idea, honestly, but it works. It would be nice to have those pin names in the board module, though.

@tannewt
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tannewt commented Aug 30, 2017

I hesitate to add the pin names because most SPI devices won't work due to no pin for the chip select.

@deshipu
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deshipu commented Aug 30, 2017

Any pin can be specified as chip select, and it's the driver for the particular device that is responsible for toggling it.

@deshipu
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deshipu commented Aug 30, 2017

I really have no idea about how the chip select line is related to this issue at all.

@tannewt
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tannewt commented Aug 31, 2017

I was confusing the Gemma which has 3 GPIO with the Trinket which has enough for SPI. Pull request proposed with the names.

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