Add support for SPI modes 0, 1, 2 #1083
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whitequark
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wanda-phi
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Dec 1, 2025
"Mode" has a specific meaning in context of SPI which this enum did not reflect. QSPI does not have the same "mode", but is also changed for consistency.
The reasoning is explained in the next commit.
The SPI controller gains an additional usage constraint: when changing modes (the default is Mode 0), you must perform an idle operation with the new mode before transferring any data. (Obviously, changing mode while a device is selected is not supported.)
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This turns out to be very necessary for a lot of real-world devices.
To do:
spi-controllerapplet supportawait self._spi_iface.dummy(128)in iCE40 SRAM interface