I have similar need of driving several spi slaves from the ConnectMe 9210, but provided low pin count available on the board I am going for option #3:
Reserve several bits at the beginning of spi transfer for addressing the slaves.
I have similar need of driving several spi slaves from the ConnectMe 9210, but provided low pin count available on the board I am going for option #3:
Reserve several bits at the beginning of spi transfer for addressing the slaves.