Serial Lcd code Porting?

1Steveo · Oct 30, 2006

I need to use a 16f676 instead of a 16f630. The 676 has "AD" and the 630 dose not! So I need to turn of the AD converter (Ansel = 0 in basic) .
The code is in "asm". I'm Brain Dead when it comes to "ASM" programming!
Here is a link to the code that I wish to Port.
https://www.sparkfun.com/tutorial/TestHex/LCD/serlcd-v1.asm
Can I just remove the comments in the " boot_up " routine?
( ; //ANSEL = 0b.0000.0000; //Disable ADC on all pins - Only on the 16F676 )

Thanks for looking!
steve

csaba911 · Oct 30, 2006

Note: The ANSEL (9Fh) and CMCON (19h)
registers must be initialized to configure an
analog channel as a digital input. Pins
configured as analog inputs will read ‘0’.
The ANSEL register is defined for the
PIC16F676.

Code:

bcf STATUS,RP0 ;Bank 0
clrf PORTA ;Init PORTA
movlw 05h ;Set RA<2:0> to
movwf CMCON ;digital I/O
bsf STATUS,RP0 ;Bank 1
clrf ANSEL ;digital I/O
movlw 0Ch ;Set RA<3:2> as inputs
movwf TRISA ;and set RA<5:4,1:0>
;as outputs
bcf STATUS,RP0 ;Bank 0

Just put this code in the firs line of boot_up.
Check and adjust you in and out need's.
Read datasheet from page 1-132, or at least page 21.

Have fun.

1Steveo · Oct 30, 2006

Thanks casab911.
I have read the "data sheet" over and over!!!
IF I paste your code to the asm file , I see a duplicate " movwf CMCON " .
Should I remove part of the "boot_up" routine and paste your code there?
Also Do I need to include the "ANSEL" address to the top of the code?

Steve

csaba911 · Oct 30, 2006

nonono
if yuo look at the code posted at sparkfun...., you will see there is already a code to make the pins digital .

Code:

    ;    //Setup Ports
            ;    //ANSEL = 0b.0000.0000; //Disable ADC on all pins - Only on the 16F676
            ;    CMCON = 0b.0000.0111; //Turn off comparator on RA port 
    MOVLW .7
    MOVWF CMCON

It should work like that !
The 05 hex in Microchips example if equall of decimal 7 in spakfun's code.

csaba911

Serial Lcd code Porting?

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