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Trouble getting hardware SPI to work with #USE SPI

 
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picj1984



Joined: 01 Mar 2010
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Trouble getting hardware SPI to work with #USE SPI
PostPosted: Mon Mar 01, 2010 7:45 pm     Reply with quote
Hi,

I'm using a PIC16F1934 and compiler version 4.105.

I've gotten the #USE SPI pre-processor directive to work successfully via software, but I have not gotten it to work correctly via hardware.

When I try to use the option "force_hw" I always get this error in the build output.

For example, here's what I got set:

Code:
#use spi(MASTER, IDLE=1, SAMPLE_RISE, LSB_FIRST, SPI1, FORCE_HW, ENABLE=PIN_D0, STREAM=STREAM1)


*** Error 99 Option invalid "NOPLLEN" Not valid for H/W

Anybody know what this means?
Rohit de Sa



Joined: 09 Nov 2007
Posts: 282
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PostPosted: Mon Mar 01, 2010 8:35 pm     Reply with quote
Apparently, with #use spi you can't use the lsb_first option AND force_hw. To send data lsb-first you'd need to use software SPI.

Read PCM's post (more than halfway down) http://ccsinfo.com/forum/viewtopic.php?t=39698

Rohit
FvM



Joined: 27 Aug 2008
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PostPosted: Mon Mar 01, 2010 11:46 pm     Reply with quote
Quote:
Apparently, with #use spi you can't use the lsb_first option AND force_hw.

It should be no surprize, that hardware SPI is restricted to features that are present in the actual PIC hardware.
Rohit de Sa



Joined: 09 Nov 2007
Posts: 282
Location: India

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PostPosted: Tue Mar 02, 2010 3:19 am     Reply with quote
FvM wrote:
It should be no surprize, that hardware SPI is restricted to features that are present in the actual PIC hardware.
True.....and the datasheet is the bible! Very Happy I guess they could have implemented LSB-first transmission with a little modification, the SSP buffer is only a shift register after all! But I guess Microchip has its reasons.

Rohit
picj1984



Joined: 01 Mar 2010
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thx!
PostPosted: Tue Mar 02, 2010 2:51 pm     Reply with quote
Thanks a million. I just mirrored the data I need to send to get around the LSB thing. Working now.

I'm definitely a huge fan of this forum now, I sent this into support over a week ago and have not even gotten a response yet. I put it on here and I get help in no time at all!
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