18F26K22 A/D example Please

[PCM programmer]

This program should work with vs. 4.110:

[bdrmachine]

Thanks for the reply I'll test it out. In the mean time I have the program working using manual setting of registers and testing / toggling the GO/DONE bit.

#byte ANSELA = 0xf38
#byte ANSELB = 0xf39
#byte ANSELC = 0xf3a
#byte ANSELD = 0xf3b
#byte ANSELE = 0xf3c
#byte ADCON0 = 0xfc2
#byte ADCON1 = 0xfc1
#byte ADCON2 = 0xfc0

#byte CM1CON0 = 0xf78
#byte CM2CON0 = 0xf77



//setup_adc(ADC_CLOCK_INTERNAL);
//setup_adc_ports(sAN0|VSS_VDD);
ANSELA = 1;
ANSELB = 0;
ANSELC = 0;
ANSELD = 0;
ANSELE = 0;

ADCON0 = 1; //AN0 (only) selected and a/d enabled
ADCON1 = 0; //Vss & Vdd are reference
ADCON2 = 0x81; //Rigth justify,

CM1CON0 = 0;
CM2CON0 = 0;


Thanks Again
Brian

[bdrmachine]

PCM programmer

I tested the code with my hardware and I get the same results as before (ANSELA remains at POR value).

The manual register select code work as expected.

Thanks
Brian

[PCM programmer]

The POR (power-on-reset) value of ANSEL is "all 1's" for the analog bits.
This means they are all configured as analog pins on power-up. I looked
at the .LST file for vs. 4.110 and it doesn't write to ANSELA (0xF38).
It leaves it in the power-on-reset state.

[bdrmachine]

I thought [setup_adc_ports(sAN0|VSS_VDD);] would have set ANSEL to 0x01 but it doesn't. Armed with this knowledge all I should have to do is make sure I manually set ANSEL.

Thanks
Brian

[gpsmikey]

Glad you got it working. Some of those "features" can drive you nuts !

mikey
_________________
mikey
-- you can't have too many gadgets or too much disk space !
old engineering saying: 1+1 = 3 for sufficiently large values of 1 or small values of 3

[bdrmachine]

Only with all of your help!

Thanks
Brian