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Syntax Help

 
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Sophi



Joined: 14 Jun 2005
Posts: 64

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Syntax Help
PostPosted: Tue Jun 14, 2005 10:12 am     Reply with quote
Hi-
I want to send a 16-bit command to a D/A from a PIC. The D/A accepts data MSB first.
My line of code to do this looks like this:
output_bit (PIN_B1, shift_left (valve, 1,0)
- the 1 and 0 are borrowed from another code and I don't know what it means.
Any info on what this syntax means and/or suggestions for coding this?
Thanks-
Sophi
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Jun 14, 2005 11:02 am     Reply with quote
Go here and get the current compiler manual.
http://www.ccsinfo.com/download.shtml

Or look for the CCS Help file in this folder:
c:\Program Files\Picc
You will find CCSC.HLP and CCSC.CHM.
bfemmel



Joined: 18 Jul 2004
Posts: 40
Location: San Carlos, CA.

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PostPosted: Tue Jun 14, 2005 1:48 pm     Reply with quote
Sophi,

You can also use the SPI to write the data out to the DAC. I do that with a 12 bit DAC sending the high byte first and then the low byte. Here is my subroutine to do that.
Code:

void SetDacVoltage(unsigned int16 voltage) {
   output_low (DAC_LD);             // Pulling this bit low allows new numbers to be accepted
   spi_write(MAKE8(voltage,1));     // Write out high byte first
   spi_write(MAKE8(voltage,0));     // Write out low byte next
   output_high(DAC_LD);             // Pull bit back high to latch data into device
}

I use an 18F6520 and this code has worked fine with the 12bit DAC, it should work just fine with the 16 bit DAC.

- Bruce
Sophi



Joined: 14 Jun 2005
Posts: 64

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PostPosted: Tue Jun 14, 2005 5:25 pm     Reply with quote
Thanks to PCM programmer for the link to the manual. All is well.
Thanks also to Bruce for the suggestion and the code.
Sophi
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