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PIC16LF1705 and DAC output

 
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starfire151



Joined: 01 Apr 2007
Posts: 195

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PIC16LF1705 and DAC output
PostPosted: Sun Jun 19, 2016 10:22 am     Reply with quote
I'm using PCWHD V5.044 on a Windows 10 machine.

I'm trying to get the DAC output for a PIC16LF1705 chip working in a test configuration.

I have the statement setup_dac(DAC_VDD | DAC_OUTPUT) in my startup code. I am attempting to write to the DAC output with a command dac_write(dacVal), where dacVal is an unsigned 8-bit value to be written to the DAC output.

I get a compiler error stating setup_dac and dac_write are undefined identifiers. I looked in the 16LF1705.h file and saw nothing about DAC setup.

According to the chip datasheet, there should be a DAC output available on pin A0.

Has anyone gotten this chip to work with the DAC output?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sun Jun 19, 2016 11:12 am     Reply with quote
Your old version doesn't support it. You will have to write your own
routines. Something like this:
Code:
#include <16LF1705.h>
#fuses INTRC_IO, NOWDT
#use delay(clock=4M)

// Constants used in setup_dac() are:
#define DAC_OFF  0
#define DAC_VSS_VDD   0x80
#define DAC_VREF_VDD  0x81
#define DAC_VSS_VREF  0x84
#define DAC_VREF_VREF 0x85
#define DAC_VSS_FVR   0x88
#define DAC_VREF_FVR  0x89
// The following may be OR'ed in with the above using |
#define DAC_OUTPUT2   0x10 
#define DAC_OUTPUT    0x20

#byte DAC1CON0 = 0x118
#byte DAC1CON1 = 0x119

void setup_dac(int8 value)
{
DAC1CON0 = value;
}

void dac_write(int8 data)
{
DAC1CON1 = data;
}

//==========================
void main()     
{
setup_dac(DAC_VSS_VDD | DAC_OUTPUT);
dac_write(128);

while(TRUE);   
}
starfire151



Joined: 01 Apr 2007
Posts: 195

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PostPosted: Sun Jun 19, 2016 11:43 am     Reply with quote
Thanks very much!
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