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PIC 18F6722 I/O SPI

 
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PCM programmer



Joined: 06 Sep 2003
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PostPosted: Tue Aug 15, 2006 11:30 am     Reply with quote
I found the code for the Kagan article. It's at this ftp site:
ftp://ftp.circuitcellar.com/pub/Circuit_Cellar/2002/145/
This is the full code for the "Driving the NKK SmartSwitch" pdf article.

This runs on a PSOC chip, which is not a PIC. It looks like he's
using hardware SPI. This is his first line in the MAIN.C file:
Code:

SPIM_1_Start(SPIM_MODE_2 | SPIM_LSB_FIRST);

He's using SPI master mode 2, and he's set it up to transmit the LSB
first. Of course, the PIC's SPI module transmits a byte "MSB first",
so a quick way of reversing the bit order within a byte by a software
algorithm must be used. Here are some threads with several methods:
http://www.ccsinfo.com/forum/viewtopic.php?t=23356
http://www.ccsinfo.com/forum/viewtopic.php?t=23364
http://forum.microchip.com/tm.aspx?m=50138

The timing should be checked with a logic analyzer. Here's a relatively
cheap one that runs on a PC (via a USB port), that we use:
http://www.pctestinstruments.com/
KamPutty
Guest
PostPosted: Tue Aug 15, 2006 3:53 pm     Reply with quote
pdswar wrote:
rwyoung, thank you very much for the info.

I was wondering if anyone here has any sample code that creates
firmware driven SPI port using general I/O pins in PIC 18F6722.

Thank you for your time.


Hi all,
I just pasted some of my spi code (pic18f4520 --> OLED) here:
http://forum.sparkfun.com/viewtopic.php?t=3808&start=15
It includes the bitbanging routines, 5x7 fonts, test code, etc...
Hope it helps...

~Kam (^8*
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