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Guidance Required About SPI

 
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hayee



Joined: 05 Sep 2007
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Guidance Required About SPI
PostPosted: Mon Feb 25, 2008 1:03 am     Reply with quote
Hi everyone,
I want to communicate two pic's (pic16f877a) through SPI. I have never used SPI before. I want some basic and simple tutorials in C language like send the command from 1st pic and on the 2nd pic the led is on or off either on any port.
i have basic knowledge of how to connect two pics physically/hardware wise.
Plz give me some tutorials. I am using CCS compiler version 4.020. I have searched and find a lot of things but they are at high level and i can't understand it. That's why i want to start it from beginning.
Plz help me out.
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Mon Feb 25, 2008 11:44 am     Reply with quote
Look at these two CCS example files:
Quote:

c:\program files\picc\examples\ex_spi_slave.c
c:\program files\picc\examples\ex_spi.c
hayee



Joined: 05 Sep 2007
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PostPosted: Mon Feb 25, 2008 11:31 pm     Reply with quote
PCM PROGRAMMER i have also seen that example but unable to understand.I install both program in two pics and when i run it the message appears in Hyper Terminal that is

Read or Write:
Read or Write:

but when i press R or W nothing will be happens.why is it?
have u any other simple example or can u write any simple example for me.
thanks.
PCM programmer



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Posts: 21708

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PostPosted: Mon Feb 25, 2008 11:57 pm     Reply with quote
The demonstration program shown in my post runs on one board
(not two boards). It demonstrates an SPI slave:
http://www.ccsinfo.com/forum/viewtopic.php?t=26888
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