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NCO operation with PIC10LF322

 
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starfire151



Joined: 01 Apr 2007
Posts: 195

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NCO operation with PIC10LF322
PostPosted: Sat Jun 20, 2015 2:50 pm     Reply with quote
Hi All -

I'm trying a simple test to get the NCO module in a PIC10LF322 to output a square wave at ~250Hz when using the HFINTOSC selection (the internal 16MHz oscillator). My code is as follows:
Code:

#include <10LF322.h>
#device ADC=16
#define CLK_FREQ 16000000
#use delay(internal = CLK_FREQ)

// ---- NCO module registers ----
#byte NCO1ACCL = getenv("SFR:NCO1ACCL")
#byte NCO1ACCH = getenv("SFR:NCO1ACCH")
#byte NCO1ACCU = getenv("SFR:NCO1ACCU")
#byte NCO1INCL = getenv("SFR:NCO1INCL")
#byte NCO1INCH = getenv("SFR:NCO1INCH")
#byte NCO1CON = getenv("SFR:NCO1CON")
#byte NCO1CLK = getenv("SFR:NCO1CLK")
#bit N1EN = NCO1CON.7

// ---- reference clock register ----
#byte CLKRCON = getenv("SFR:CLKRCON")
#bit CLKROE = CLKRCON.6

#use fixed_io(a_outputs=PIN_A2)

void main()
{
   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);

   set_tris_a(0x0b); // only pin A2 is an output
   
   CLKROE = 0;       // disable reference clock when using NCO
   
   N1EN = 0;         // disable NCO while initializing values

   NCO1CON = 0x50;   // N1EN=0; N1OE=1; N1POL=1; N1PFM=0
   NCO1CLK = 0x00;   // N1CKS[1:0]=00 => HFINTOSC clk src (16MHz)
   
   NCO1ACCL = 0x00;  // clear accumulator
   NCO1ACCH = 0x00;
   NCO1ACCU = 0x00;
   
   NCO1INCL = 16;    // set increment value for ~250Hz output
   NCO1INCH = 0;
   
   N1EN = 1;         // enable NCO now
   
   while(TRUE)
   {

   }
}


I checked the note in the errata sheet stating to clear the CLKROE bit when using the NCO. I did this at the beginning of the program.

I tried several variations but nothing seems to work.

Is there something fundamental I'm overlooking?

Thanks for any help.
starfire151



Joined: 01 Apr 2007
Posts: 195

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PostPosted: Sat Jun 20, 2015 2:53 pm     Reply with quote
If forgot to mention my specifics:
Compiler: PCWHD V5.044
Computer: Win 7 32-bit
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Jun 20, 2015 6:32 pm     Reply with quote
What happens if you use the CCS example from the manual:
Code:

setup_nco(NCO_ENABLED|NCO_OUTPUT|NCO_FIXED_DUTY_MODE|NCO_CLOCK_FOSC, 8192);

It compiles to this with vs. 5.044:
Code:

001C:  BCF    NCO1CON.N1EN
001D:  MOVLW  FB
001E:  MOVWF  TRISA
001F:  MOVLW  20
0020:  MOVWF  NCO1INCH
0021:  CLRF   NCO1INCL
0022:  MOVLW  01
0023:  MOVWF  NCO1CLK
0024:  MOVLW  C0
0025:  MOVWF  NCO1CON


Also, asmboy has posted demo code for the 16F1509 NCO module here:
http://www.ccsinfo.com/forum/viewtopic.php?t=50121
starfire151



Joined: 01 Apr 2007
Posts: 195

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PostPosted: Sat Jun 20, 2015 8:18 pm     Reply with quote
That worked! Great!

Now I have something to compare to Very Happy

Thanks.
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