Hi again, there is a missunderstanding here. I'm NOT trying to read the analog port. I want to read the digital port. I mean RF0..RF7. I think you don't understand me, but may be i didn't understand you, if so please sorry.

        Mauricio Jancic

-----Mensaje original-----
De:     Quitt, Walter [SMTP:wquitt@MICROJOIN.COM]
Enviado el:     Lunes, 13 de Diciembre de 1999 03:20 p.m.
Para:   PICLIST@MITVMA.MIT.EDU
Asunto: Re: PIC17Cxxx Urgent HELP!!

The code reads AN0.  You need to change it to read ANx
(where x is the analog port number)  It does it
in NON real time.  It is straight code.  Just
execute it to read your analog port.

I STRONGLY suggest you read the data sheet (book)
for the 756.  There are MANY places to make mistakes.

The referenced code to several days to work out.
I don't remeber how it all works all the time.

Review the code and check it against the referenced
sections it the data sheet.

Good Luck,
Walt....

-----Original Message-----
From: Mauricio Jancic [mailto:mrjancic@SION.COM]
Sent: Monday, December 13, 1999 9:58 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: PIC17Cxxx Urgent HELP!!


Thanks Walter, but I think I don't explain myself very good. What I'm
trying to do is simply to read the PORTF contents. I have tryied to do
the basic thing I can do: I put all the port as input, read it and print
it on the LCD. Please if you can help me on this I'll apreciate it. For
a more detail explanation read again my message and try to undestand it,
cause english is no my first language as you can see...

        Thanks again,

        Mauricio Jancic

-----Mensaje original-----
De:     Quitt, Walter [SMTP:wquitt@MICROJOIN.COM]
Enviado el:     Lunes, 13 de Diciembre de 1999 02:31 p.m.
Para:   PICLIST@MITVMA.MIT.EDU
Asunto: Re: PIC17Cxxx Urgent HELP!!

Here is a code snipet of how I have done it:

;***************************************************************
;* Read_Configuration
;*
;*   Reads the configuration voltage to determine the number
;*   of FETs or FET boards to determine system power level.
;*   This uses Port G RG3:AN0 as an analog channel
;*
;*   It also messes with other ports so must be done early
;*   in/during init (pg 178)
;*
;*   GLOBAL Interrupts MUST be OFF!
;*   Since this is only called at init we can use software
;*   loop timeouts for waiting for ADC conversions.
;*
;***************************************************************
Read_Configuration
   ; ** First assume NO Configuration Fault ********************
   movlr  STATES
   movlw  FALSE
   movwf  CONFIG_FAULT_STATE

   ; ** SETUP for ADC conversions ******************************
   movlb  5           ;Bank 5 is ADCON bank

   ; ** pg179 1. Config anlaog pins/ V ref, and digital I/O **
   movlw  B'10101100' ;64T Clock select, output right justified,
                      ; AN9,8,1,0 are inputs, A/D ref is AVdd and AVss
   movfp  WREG,ADCON1 ;

   ; ** pg179 1. Select A/D input channel **
   movlw  B'00000001' ;AN0,NO Conversion running, Converter is ON
   movfp  WREG,ADCON0 ;  NOTE: AN0 is Port G bit 3

   ; ** pg 179 3. Wait the required acquisition time **
   ; Recall 1 instruction is 4Q cycles = 4*1/28MHZ = 4*35ns = 140ns
   ; So 255 * 140ns is 35,700ns = 35us which is good enough
   ; for a Tacq as shown on pg181
   movlr  0
   movlw  H'FF'
   movwf  TEMP_0
Read_Configuration_Wait_loop
   decfsz WREG,F
   goto   Read_Configuration_Wait_loop

   ; ** pg179 4. Start Conversion **
   bsf     ADCON0,GO

   ; ** pg179 5. Wait for A/D conversion to complete by polling GO/DONE
**
Read_Configuration_Wait
   btfsc   ADCON0,GO
   goto    Read_Configuration_Wait

   ; ** pg179 6. Read A/D result out of ADRESH and ADRESL in Bank 5 **


-----Original Message-----
From: Mauricio Jancic [mailto:mrjancic@SION.COM]
Sent: Monday, December 13, 1999 7:21 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: PIC17Cxxx Urgent HELP!!


Hi all, here I'm again having problems. This time I'm using a PIC17C756.
All I want to do is to read the portf. I've set this port as analog
inputs and configure the corresponding pins as inputs or otputs, like
this:


        movlb   5
        movlw   0x0E
        movpf   WREG, ADCON1
        clrf    PORTF, f
        movlw   0xF3
        movwf   DDRF


Then, I just go to this routine, wich reads the port data and send it to
a routine that print it on a LCD display
Important: I clear pins 2 and 3 because i conected on this port a matrix
keyboard, so when I press a key it "sends" the '0' present at one pin to
another pin of the PIC. All pins have a 10k pull-up. I also try putting
pins 0 and 1 to Vcc (by hard) but it didn't change the value read by the
pic.

Main
        movlb   5               ; Bank 5
        clrwdt
        bcf     Teclado, 2      ;
        bcf     Teclado, 3

tel     movfp   PORTF, WREG             ; Read PORTF
        andlw   0xF3                    ; Mask to evitate unwanted data
from unused pins (4 and 5)
        call    lcd_wrtlcd              ; print data to lcd
        movlb   5
        clrwdt

        call    delay                   ;wait
        call    delay
        call    delay
        call    delay

        movlb   0                       ; Send lcd cursor to home
        movlw   2
        movwf   DISPLAY

        movlb   1
        bcf     LCDCTRL,RS
                call    lcd_pulsoE
                call    delay
        goto    tel                     ; go  back and read PORTF again


Thank!!

 Mauricio Jancic