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Help with spi_write()...

 
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Help with spi_write()...
PostPosted: Tue Dec 05, 2006 9:31 pm     Reply with quote
I am trying to interface with a digital compass (HM55B), and am trying to send it the initializing signals via spi. However, the compass is expecting the signals to be four bits long. Is there any way to use spi_write(), and only send four bits???

Thanks in advance
Ttelmah
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PostPosted: Wed Dec 06, 2006 3:52 am     Reply with quote
No.
The hardware only supports 8 bit operation.
It is very easy to 'bit bang' though. Look at the example file 'PNI11096.c', which bit bangs out, and 8 bit command, followed by a 16 bit reply read back. Instead of 'axis', send your command. Amend th number of bits to 4, and your are 95% of the way there.

Best Wishes
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