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accessing ADFM [solved]

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cerr

Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC

accessing ADFM [solved]

Posted: Wed Mar 23, 2011 4:34 pm

Hi There,

I would like to have my a/d value read right aligned and for that I need to set ADFM to 1.
I tried following:

Code:

#include <18F87K22.h>
#device HIGH_INTS=TRUE, adc=16, ICD=TRUE

#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HSM //Hi-Speed crystal oscillator
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOPLLEN //No PLL enabled
#FUSES BBSIZ1K //1K words Boot Block size
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)

#use delay(clock=10000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PC, ERRORS)
#bit ADFM = ADCON2.7

void main (void)
{
ADFM=1;
int16 adcval=0;

while (true) {
setup_adc(ADC_CLOCK_INTERNAL | ADC_TAD_MUL_0);
set_adc_channel(sAN0);
delay_us(10);
adcval=read_adc();
fprintf(PC,"0x%4LX\r\n", adcval);
}
}

But the compiler doesn't seem to know what ADCON2 is as it says:
*** Error 12 "analog.c" Line 16(1,3): Undefined identifier
How do I get access to the ADFM config bit in the ADCON2 register?
Thanks!

MCU: PIC 18F87K22
Compiler: 4.119

cerr

Joined: 10 Feb 2011
Posts: 241
Location: Vancouver, BC

Posted: Wed Mar 23, 2011 5:11 pm

GOT IT!
Probably not the best version but it works:

Code:

#include <18F87K22.h>
#device HIGH_INTS=TRUE, adc=16, ICD=TRUE

#FUSES NOWDT //No Watch Dog Timer
#FUSES WDT128 //Watch Dog Timer uses 1:128 Postscale
#FUSES HSM //Hi-Speed crystal oscillator
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOPLLEN //No PLL enabled
#FUSES BBSIZ1K //1K words Boot Block size
#FUSES NOXINST //Extended set extension and Indexed Addressing mode disabled (Legacy mode)

#use delay(clock=10000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,stream=PC, ERRORS)
//#bit ADFM = ADCON2.7
#byte ADCON2 = getenv("sfr:ADCON2")

void main (void)
{
//test=1;
int16 adcval=0;
setup_adc(ADC_CLOCK_INTERNAL);
ADCON2|= 0x80;

while (true) {
set_adc_channel(sAN0);
delay_us(10);
adcval=read_adc();
fprintf(PC,"0x%x 0x%4LX\r\n", ADCON2,adcval);
}
}

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