Does the SPI on Blackfin support 24-bit data transfers in hardware?
SPI on BF52x, BF54x, BF561, and BF53x devices does not support 24-bit data transfers in hardware.
In certain configurations, (master mode operation with CPHA=0), a software workaround may be used as follows:
This software workaround only works when the CPHA bit in SPI_CTL is set. When the CPHA bit is cleared, the slave select pins can only be controlled by hardware
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