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groston
Joined: 06 Mar 2007
Posts: 6
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| Bug in spi_read()? |
 Posted: Wed May 30, 2007 9:32 pm |
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I am using the CCS C compiler, version PCM 4.x. The system uses a PIC 16F886 as an SPI master and another device as the SPI slave. The PIC is being configured as:
setup_spi(SPI_MASTER | SPI_L_TO_H | SPI_CLK_DIV_16);
According to the documentation, page 51, "If you just want to clock in data then you can use spi_read() without a parameter."
This just isn't so. I have an oscope hooked up to my test system, and when spi_read() is called without a parameter, the clock is not generated.
Is there a fuse, or some other parameter, that needs to be set, or is this a bug?
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Gerald P. Roston |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed May 30, 2007 9:43 pm |
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The CCS manual says this in the SPI_READ() section:
| Quote: |
If there is no data to send just do a SPI_READ(0) to get the clock.
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To read from the slave, this is what the master should do:
| Code: |
int8 c;
c = spi_read(0);
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groston
Joined: 06 Mar 2007
Posts: 6
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| Posted: Wed May 30, 2007 10:17 pm |
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Ah - quality documentation. One page says 'X" another says "not X". Quality goes in before the names goes on...
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Gerald P. Roston |
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