68300

Hello All

Thanks you all very much for your replies.
I have implemented your suggestions and now have bi-directional SPI
communications - yes!

The key part of the jigsaw puzzle I was missing, which you all helpfully
filled in, was the requirement to transmit the correct number of "dummy"
 in my case all '0') bytes after the QSPI request bytes to enable the slave
to send back it's response.
The SPI slave I was having trouble with is a telecom line interface chip, so
there is no possibility of implementing a higher level protocol on it but,
as I know the length of the slave's response, to any request made, I can
achieve my aim's.

The QSPI is a powerful, if understated, beast. I only recently appreciated
that you can configure the individual polarity of each of the four SPI chip
selects, a feature that enables us add an SPI EEPROM that has an active high
chip select, the line interface chip being active low chip select.

Thanks
-
Robert Manktelow
Telspec Europe Ltd, Rochester, ME1 3QU
Phone +44 (0)1634 687 133 extension 2346