assembly in Pic

[lerameur]

Ok , he is doing in the program the following:
sending
0 0 1 1 1 0 0 0 to portA
then
0 0 0 0 1 0 0 0 to portA
then
0 0 0 0 0 1 1 0 to portA
then
0 0 0 1 0 1 0 0 to portA

how do we know which one is which (DISPLAY OFF,
ENTRY MODE SET etc...)

k

[skimask]

Ok , he is doing in the program the following:
sending
0 0 1 1 1 0 0 0 to portA
then
0 0 0 0 1 0 0 0 to portA
then
0 0 0 0 0 1 1 0 to portA
then
0 0 0 1 0 1 0 0 to portA

how do we know which one is which (DISPLAY OFF,
ENTRY MODE SET etc...)

k

Get a datasheet for nearly any parallel input LCD (Hitachi 44780 controller chip) and match the bit positions on PortA in the program with the bit positions in the LCD's datasheet. They will match up as long as you have a decent datasheet.

[mister_e]

There's some datasheet with initialisation chart example (http://inst.eecs.berkeley.edu/~cs150...heckpoint3.PDF) . You may try to find some PicBasic LCD routine (not PBP of course)

now it's just a matter of finding the values in the datasheet.

a while back i did something for a 4 bit mode, the initialisation sequence looked like..

    '           ---------------------------------------------
    '           LCD Initialisation for HD44780 and compatible
    '                           4 BIT MODE
    '           ---------------------------------------------
    asm
    ;   LCD_OUT   Mode, Data, DelayUS
        LCD_OUT   ONCE,  30h,  5000     ; I want to use 4 bit mode !
        LCD_OUT   ONCE,  30h,  500      ;   Did you hear me?
        LCD_OUT   ONCE,  30h,  500      ;   Last chance or... too bad!
        LCD_OUT   ONCE,  20h,  500      ; Official 4 bit mode start
       
        LCD_OUT   SPLIT, 28h,  0        ; Function set [4bit, 2lines,5x7]
        LCD_OUT   SPLIT, 0Ch,  0        ; turn on the display
        LCD_OUT   SPLIT, 01h,  0        ; clear it
        LCD_OUT   SPLIT, 06h,  0        ; entry mode
    endasm

if you need the source code, i can post it.

[lerameur]

HI, I found the tutorial from Bigonoff for the pic16F84, I read it and it was very good. He also has a tutorial for the pic16F877 (in french also) does anyone has it. Unfortunaetly he removed it from his web site. Have a look
http://www.abcelectronique.com/bigonoff/
I would appreciate if somebody who had this 500 page pdf to sent it to me
thanks

ken

[mister_e]

i knew he was an a s s h o l e but at that point

anyways, i think i may have a PDF copy of a OLD previous lessons of him.

I think i also have a copy of CEGEP du vieux Montreal lesson somewhere... I'll let you know if i find it.

[Acetronics2]

Hi, Ken

The site is only TEPORARILLY Shut Down ...

The fact is Bigo. didn't appreciate to get a TRUE "State Leader" ( Whether he is Socialist or Capitalist !!! ).

May be he could apply His shiny democracy lessons to himself ...

We just have to wait a moment for him to get out of Childhood ...

Alain

He's not the only " who knows" ( we've got TRENT here ...)

have a look here, in between :

http://www.hobbyprojects.com/microco...tutorials.html

P.S : I DO Have the 5+ Zip files on my HDD ... if really necessary.

[mister_e]

and while we're at it, MikroElektronika also do some kind of tutorial as well
http://www.mikroe.com/en/books/picbook/picbook.htm

untill Mr Bigonoff break his own stupid buble, the above is for sure a nice start point... but as Mr Bigonoff.. it's outdated. Bah, ASM is ASM.

[Ruben Pena]

Dear Julio:
Are you J.A.Sanchez from the Video stamp project in April 08 Circuit Cellar ?. If so..
I have several questions about the project:
I made a small PCB to mount the components, but I added a 4k7 resistor at the Mclr pin,
because I can not find where do you define the use of the internal reset.
It works since the first time,but I found comm errors in the transmited data... I will add
a 8MHZ resonator and will try again...(Note if I cut the Mclr resistor it stops working).
Also... when I programmed the original hex file with the USB Melabs Progremmer,the osc
fuse is configured as extrc. Any comments...?
My congratulations for this outstanding proyect.
PBP 2.5 MPLAB 8.02 PIC18F2520
Greetings...
Ruben de la Pena V.