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spi_write()

 
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boulder



Joined: 15 Mar 2008
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spi_write()
PostPosted: Thu Dec 11, 2008 6:35 pm     Reply with quote
Hi,
Is it true that SPI slave cannot use spi_write(data) to send out data? Or only master can use spi_write(data) to send out data? On the CCS compiler manual, it says spi_write() can cause clock to be generated. So, I guess it's only used by master.

Thanks.
RLScott



Joined: 10 Jul 2007
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Re: spi_write()
PostPosted: Thu Dec 11, 2008 7:12 pm     Reply with quote
boulder wrote:
Hi,
Is it true that SPI slave cannot use spi_write(data) to send out data? Or only master can use spi_write(data) to send out data? On the CCS compiler manual, it says spi_write() can cause clock to be generated. So, I guess it's only used by master.
Thanks.

For an SPI slave, all you really want to do is put a byte into the SSPBUF register. So if you are worried about what else there may be in spi_write(), just bypass the CCS library and use:
Code:

#byte SSPBUF=0x13   (or whatever it is on your PIC)
  . . .
  SSPBUF = val;

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Robert Scott
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PCM programmer



Joined: 06 Sep 2003
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PostPosted: Thu Dec 11, 2008 7:36 pm     Reply with quote
See this post for detailed info:
http://www.ccsinfo.com/forum/viewtopic.php?t=35442&start=4
boulder



Joined: 15 Mar 2008
Posts: 53

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PostPosted: Thu Dec 11, 2008 9:47 pm     Reply with quote
Thanks for help.
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