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spi_write()

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boulder

Joined: 15 Mar 2008
Posts: 53

spi_write()
Posted: Thu Dec 11, 2008 6:35 pm

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
Posts: 465

Re: spi_write()

Posted: 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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Embedded Systems Consulting

PCM programmer

Joined: 06 Sep 2003
Posts: 21708


Posted: Thu Dec 11, 2008 7:36 pm

See this post for detailed info: http://www.ccsinfo.com/forum/viewtopic.php?t=35442&start=4

boulder

Joined: 15 Mar 2008
Posts: 53


Posted: Thu Dec 11, 2008 9:47 pm

Thanks for help.

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