Interrupt driven SPI with multiple slaves

[NEW_GUY]

Hello folks,

I am trying some impish things, but they really proper ways to study the protocols like SPI.

I am working with SPI which works fine with 1 slave at regular timer 0 1 msec interrupt, but when I adds the second slave then neither of them works...

I think they might have timing issues, OR the CS may not be in sync with the h/w SPI interrupt.

A little help would be good,
Thank you.

[Gabriel]

in SPI you have 4 control lines:

SDI: Common to all slaves
SDO: Common to all slaves
CLK: Common to all slaves
CS: independant for each slave

so if you have 3 slaves you will share SDI, SDO,and CLK... but your will need a SEPARATE IO for each CS line of each slave...

G.
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CCS PCM 5.078 & CCS PCH 5.093

[bkamen]

As a comment from an onlooker, that original post is pretty incoherent.

I can't stress enough that a forum like this needs really clear explanation of terms and problems.

If we have a hard time interpreting your request/problem/question, you will most likely get the wrong answer to that request for help.

As the old saying goes, "Garbage in, garbage out".

-Ben
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Dazed and confused? I don't think so. Just "plain lost" will do. :D