ADC trouble with PIC16F88

[inventosrl]

Hello all,

I'm newbie, the goal of my project it's to use only RA0 in ADC mode and
the rest of TRISA in a digital input but, in this setting don't work.

Any help will be appreciated.

Thanks a lot and regards

giorgio

The Code :

'************************************************* ***************
'* Name : CONTROLLER.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2008 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 26/11/2008 *
'* Version : 1.0 *
'* Notes : *
'* Chip : PIC16F88 *
'************************************************* ***************
INCLUDE "MODEDEFS.BAS"
define OSC 4
adval VAR BYTE
i var BYTE
RPM VAR BYTE




ADCON0.7 = 1 ' right justify result
ANSEL = %00000001 ' set AN0 analog, rest digital
CMCON = 7 ' analog comparators off

TRISA = %00001111 'RA.0:3 Input
TRISB = %00000000 'all PORTB output

Output PORTB.4 ' set RB0 as output
Output PORTB.5 ' set RB1 as output

loop:
ADCIN 0,adval
IF adval < 90 THEN
HIGH PORTB.4
endif

IF adval > 100 THEN
LOW PORTB.4
endif

COUNT PORTA.2,250,RPM
for i = 1 to rpm
toggle PORTB.5
PAUSE 25
NEXT i
LOW PORTB.5
GOTO loop 'repeat

[mikendee]

Hi and welcome,

The code appears to be okay to me ( another newbie).
You don't need these lines as you already set TRISB = 0
Output PORTB.4 ' set RB0 as output
Output PORTB.5 ' set RB1 as output

I just wondered if you have a resister on RA0 to limit the current into the pin.
If you don't you may damage the PIC.
Hope this may help.

Mike

[mackrackit]

Howdy,

This

 
ADCON0.7 = 1 ' right justify result

should be

ADCON1.7 = 1 ' right justify result

This may help also
http://rentron.com/PIC12C67XAD.htm
Different PIC, same type of ADC.

[inventosrl]

Hi and welcome,

The code appears to be okay to me ( another newbie).
You don't need these lines as you already set TRISB = 0
Output PORTB.4 ' set RB0 as output
Output PORTB.5 ' set RB1 as output

I just wondered if you have a resister on RA0 to limit the current into the pin.
If you don't you may damage the PIC.
Hope this may help.

Mike

Thanks , it was a mistake

[inventosrl]

Howdy,

This

 
ADCON0.7 = 1 ' right justify result

should be

ADCON1.7 = 1 ' right justify result

This may help also
http://rentron.com/PIC12C67XAD.htm
Different PIC, same type of ADC.

Hello Dave, thanks a lot, but the very big problem it's the IC-PROG and JDM Programmer, that apparently don't give any error but the PIC is not programmed.
Tomorrow try to unreverse the serial communications signal in the JDM section.

TNX
giorgio

[mackrackit]

Save your headaches and look to getting a PICKIT2 from MicroChip.

[inventosrl]

Save your headaches and look to getting a PICKIT2 from MicroChip.

Hello Dave,
pickit buyed and running, I've too mounted a 18 pin in a board connected with the ICSP signal.
It's all ok with pic 16f628, but with 18f88 have this alarm message


The code :
'************************************************* ***************
'* Name : CONTROLLER.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2008 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 26/11/2008 *
'* Version : 1.0 *
'* Notes : *
'* Chip : PIC16F88 *
'************************************************* ***************
INCLUDE "MODEDEFS.BAS"
TRISA = %11111111 'RA.0:3 Input
TRISB = %00000000 'all PORTB output

ANSEL=%00000001'only porta.0 is analogue
ADCON1=%00000010'right justify the result(top bits are read as zero)
CMCON = 7 'Turn off comparators

adval VAR BYTE
i var BYTE
RPM VAR BYTE

' Define ADCIN parameters
Define ADC_BITS 8 ' Set number of bits in result
Define ADC_CLOCK 3 ' Set clock source (3=rc)
Define ADC_SAMPLEUS 50 ' Set sampling time in uS
PAUSE 500

loop:
ADCIN 0,adval

serout PORTB.6,n2400, [$FE, 1]
serout PORTB.6,n2400, [$FE, 2, "pressione ", #adval]
serout PORTB.6,n2400, [$FE, $C0, "giri", #rpm]

IF adval < 90 THEN
HIGH PORTB.4
endif

IF adval > 120 THEN
LOW PORTB.4
endif

COUNT PORTA.2,250,RPM
for i = 1 to rpm
toggle PORTB.5
PAUSE 25
NEXT i
LOW PORTB.5
GOTO loop 'repeat

Any help will be apreciated,
Thanks a lot

giorgio

[mackrackit]

Can you post you inc file with the config settings?

[inventosrl]

Hi Dave , I'm at home now, but have the original one from MPASM 8.10 ans pbc Pro 2.50. MicoCode Studio Plus last release.

Tomorrow (now it's 23,20 pm) I'll post the file.

tnx

[inventosrl]

Hi Dave , I've posted the files in a PicBasicPro forum:


http://www.picbasic.co.uk/forum/showthread.php?t=10207