> What are the chips? I can't think of how you can do something SPI-like
> without a chip select, as the chip will not know who you're talking to or
> where the end of a command is. Is it, perhaps, I2C? If so, I2C includes
> address bits in the bitstream. The chips are either pre-programmed with an
> address or have pins that let you set an address.

Agilent optical mouse sensors. They use something that can be thought of as
SPI if you tie the Data In and Data Out lines together (only the sensor
*or* the microprocessor is speaking at a time and this is ridgedly
controlled) without a slave select.

You *can* have SPI without a slave select, you can only have one slave.

These changes are why I called it "spi-like".
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D. Jay Newman           !
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