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Own version of SPI_WRITE

 
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theteaman



Joined: 04 Aug 2006
Posts: 98

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Own version of SPI_WRITE
PostPosted: Wed Aug 30, 2006 7:58 am     Reply with quote
Hello

I am having a real issue finding a bug with spi_write(). I was wondering if anyone had any simple code to replicate spi_write but in ccs-c?

thanks
Ttelmah
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PostPosted: Wed Aug 30, 2006 8:26 am     Reply with quote
I did a little SPI library for my own use a while ago.
Code:

#if define (__PCH__)
  #byte   SSPBUF = 0xFC9
  #byte   SSPCON = 0xFC6
  #byte   I2CBUF = 0xFC8
  #byte   SSPSTAT = 0xFC7
#else
  #byte   SSPBUF = 0x13
  #byte   SSPCON = 0x14
  #byte   I2CBUF = 0x93
  #byte   SSPSTAT = 0x94
#endif

/* Now the SSP handler code. Using my own, since the supplied routines test the wrong way round for my needs */
#DEFINE   READ_SSP()     (SSPBUF)
#DEFINE   WAIT_FOR_SSP() while((SSPSTAT & 1)==0)
#DEFINE   WRITE_SSP(x)   SSPBUF=(x)
#DEFINE   CLEAR_WCOL()   SSPCON=SSPCON & 0x3F


A emulation of the spi_write function, would be:

WRITE_SSP(value);
WAIT_FOR_SSP();

However I wanted the two operations to be seperate, since I can then write a character, let the hardware 'get on' with doing the transfer, and only test that a transfer has completed when I next need to write, with:

WAIT_FOR_SSP(); //Test last transfer has completed
value=READ_SSP(); //retrieve last transfer if required
WRITE_SSP(new_value); //and start the next transfer.

Best Wishes
theteaman



Joined: 04 Aug 2006
Posts: 98

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PostPosted: Wed Aug 30, 2006 8:35 am     Reply with quote
Thank you very much ttelmah! I will use these macros and hopefully it all works!! Smile (I was sure I saw this code of yours somewhere else on the forum but i couldnt remember how i found it witht the 'search' function).
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