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HW SPI

 
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jmaudley



Joined: 01 Feb 2011
Posts: 32
Location: 53

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HW SPI
PostPosted: Wed Sep 14, 2011 10:05 am     Reply with quote
Hi, - I'm new to the CCS compiler and programming in C, but not new to programming PICs.

I'm trying to drive an HCMS-2963 display using the SPI interface.

I'm using a 16f876a chip and pins are configured correctly for hardware SPI implementation.

I've read the manual and #use spi seems to be quite simple (unless I'm missing the point).

My understanding is that once I have set the following line:
Code:

#use spi (FORCE_HW, BITS=8, STREAM=SPI_STREAM)

All i need to do is:
Code:

spi_xfer(data);

To send out my data.

Am I correct in saying that #use spi handles all of the configuration or do I need set the appropriate registers.

If anybody could point me in the direction of some code examples that would be really helpful.

Any assistance would be appreciated. Thx








PCM programmer



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PostPosted: Wed Sep 14, 2011 12:16 pm     Reply with quote
Whether or not #use spi() works, or also, what specific parameters are
required, is highly dependent upon your compiler version. Please post
your version.
jmaudley



Joined: 01 Feb 2011
Posts: 32
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PostPosted: Thu Sep 15, 2011 1:20 am     Reply with quote
I'm using the PCWH compiler

IDE 4.107
PCB 4.107
PCM 4.107
PCH 4.107
PCM programmer



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PostPosted: Thu Sep 15, 2011 3:07 pm     Reply with quote
I think it would be much easier to use the setup_spi() method of
configuring the hardware SPI module. Example:
Code:

#define SPI_MODE_0  (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1  (SPI_L_TO_H)
#define SPI_MODE_2  (SPI_H_TO_L)
#define SPI_MODE_3  (SPI_H_TO_L | SPI_XMIT_L_TO_H)

//========================
void main()
{
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_16);
.
.
.


Then, to write an 8-bit value to the slave, you can use:
Code:

spi_write(data);


Here are some examples of spi driver code:
http://www.ccsinfo.com/forum/viewtopic.php?t=44786&start=1
http://www.ccsinfo.com/forum/viewtopic.php?t=37687&start=11
http://www.ccsinfo.com/forum/viewtopic.php?t=45258&start=3
http://www.ccsinfo.com/forum/viewtopic.php?t=41008&start=5
http://www.ccsinfo.com/forum/viewtopic.php?t=40443&start=1
jmaudley



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Posts: 32
Location: 53

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PostPosted: Fri Sep 16, 2011 1:38 am     Reply with quote
Thanks for the advice.

I'll give that a try.
jmaudley



Joined: 01 Feb 2011
Posts: 32
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PostPosted: Fri Sep 16, 2011 7:57 am     Reply with quote
Very Happy

Got it working (my first C project).

Good to know I'm not on my own.

PCM programmer - thx for taking the time to help.
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