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Software SPI

 
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Will Reeve



Joined: 30 Oct 2003
Posts: 209
Location: Norfolk, England

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Software SPI
PostPosted: Sat Jun 26, 2004 9:57 am     Reply with quote
I am surprised I can’t find a software SPI implantation in the collection of inbuilt functions. I am using a 16F871 and Microchip decided to delete the hardware SPI. Instead of plugging in the more expensive 16F877 device I was wondering if there is any software implantation issues? I will only be writing (to one of Microchips digital pot IC’s), it looks like I can bit bash it out, is it really that simple? If so can I add it to a “wish list” for the next compiler revision :=)

Will
languer



Joined: 09 Jan 2004
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Location: USA

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That should be ok
PostPosted: Sat Jun 26, 2004 12:00 pm     Reply with quote
Check this thread,

http://www.ccsinfo.com/forum/viewtopic.php?t=80&highlight=software+spi

The only issue (if you need it, and you probably don't) would be speed.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jun 26, 2004 12:09 pm     Reply with quote
Quote:
I will only be writing (to one of Microchips digital pot IC’s).

See the following example file and drivers, for examples of how
to use software SPI with digital pots:

EX_DPOT.C

and the following drivers:
AD8400.C
DS1868.C
Will Reeve



Joined: 30 Oct 2003
Posts: 209
Location: Norfolk, England

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PostPosted: Sun Jun 27, 2004 1:10 pm     Reply with quote
Top job, thanks. Saves me having to write that :-) Thanks again. I am trying to keep the costs down on this project as there are going to be a decent volume of them, hence the penny pinching. The PIC is going to be the most expensive part!

Keep well,

Will
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