SPI again

[davidc]

Hiya,

@awneil

At the hardware level the SPI itself is, of course, always synchronous.

That’s what I thought - I thought blackyblack was referring to the SPI protocol itself - and I had missed something really major…

@blackyblack

My SPI slave can read and write simultaneously, but it waits for Q2686 transfers.

Thinking back, I probably should have said ‘full duplex’, rather than ‘bi-directional’. The Q2686 SPI API only seems to support half-duplex communications. This is a major hick-up in the Wavecom SPI API.

@blackyblack

Also I’d like to know is it OK to expect all zeroes or all ones on MOSI during Q2686 read?

Writing all zeros out the MOSI pin to clock data in seems to be a sane thing to do. It’s been so long since I’ve worked on that section of my code that I can’t remember what I saw on the oscilloscope.

ciao, Dave