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help needed on spi master and slave c code

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egg86

Joined: 25 Aug 2009
Posts: 3

help needed on spi master and slave c code

Posted: Sat Dec 19, 2009 10:20 pm

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Hi all, I'm doing SPI on a project and I'm new to spi. How do i assign the register sspcon1 and sspstat?

Is it this (at declaration):

Code:

#define sspcon1
#define sspcon2
#define sspstat

Or this (at declaration):

Code:

# byte sspcon1 = 0x20
# byte sspstat = 0x00

Or this (in main code):

Code:

sspcon1 = 0x20;
sspstat = 0x00

Or other method? I tried the first and second declarations above but my code didn't work. I tried the third declaration but compiler said "the line has no effect". What should I do? I just want to perform the most basic spi of master send data to slave using PIC16F877A for both. Pls help.

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Sat Dec 19, 2009 10:46 pm

Do you have the CCS compiler ? The following links show how to write SPI code if you have the CCS compiler: Here is a simple test program to show some activity on the SPI master's clock and data pins: http://www.ccsinfo.com/forum/viewtopic.php?t=40998&start=4 Example of an SPI master program: http://www.ccsinfo.com/forum/viewtopic.php?t=41008&start=5 Here are some sample SPI master and slave programs: http://www.ccsinfo.com/forum/viewtopic.php?t=39145 http://www.ccsinfo.com/forum/viewtopic.php?t=26888

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