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- SPI Chip Select behavior:
- With the Blackfin on-chip SPI peripheral, there is some logic tied to the CPHA
- bit whether the Slave Select Line is controlled by hardware (CPHA=0) or
- controlled by software (CPHA=1). However, the Linux SPI bus driver assumes that
- the Slave Select is always under software control and being asserted during
- the entire SPI transfer. - And not just bits_per_word duration.
- In most cases you can utilize SPI MODE_3 instead of MODE_0 to work-around this
- behavior. If your SPI slave device in question requires SPI MODE_0 or MODE_2
- timing, you can utilize the GPIO controlled SPI Slave Select option instead.
- You can even use the same pin whose peripheral role is a SSEL,
- but use it as a GPIO instead.
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