Nokia lcd include , small footprint to suit pic16's

[richard]

I had no display until changing TRISA from %10010000 to all outputs

correct I failed to make the LCD_RST pin an output , all the "LCD" pins need to be digital outputs.
my code did not work after a power cycle , the disp was keeping its config from previous code so resets never happened
it all looked good while the power was still applied.

When I add LCD_LIGHT = 1 in the mix I have no text displayed.

LCD_LIGHT = 1 is backlight off. LCD_LIGHT = 0 is backlight on
if it does anything else then check your wiring , or it may be a power problem

[richard]

found a problem , the init subroutine needs to pause a bit after the rst pulse otherwise display may not initialise properly

lcd_init:
    @ GLetAddress _font7x5,_glcdFont
    bigtxt = 0
    inverted =0
    #ifdef use_mssp 
    SSP1CON1=$21  ;$22,21,20 all work @32mhz  20 is fastest 
    SSP1STAT=$40
    #endif
    LCD_CE=1 
    pause 30 
    Lcd_RST = 0         ' Reset LCD (HW reset)
    pause 1
    Lcd_RST = 1         ' Release Reset
    pause 1     ;add this pause
'    lcd_dc=0
    LCDCMD   $21        ' LCD EXTENDED COMMANDS
    LCDCMD   $c8        ' SET LCD Vop (CONTRAST) initial value $C8 = 200.
    LCDCMD   $06        ' SET TEMP COEFFICIENT
    LCDCMD   $13        ' LCD BIAS MODE
    LCDCMD   $20        ' LCD STANDARD COMMANDS
    LCDCMD   $08        ' LCD blank
    LCDCMD   $0c        ' LCD IN NORMAL MODE
return

[richard]

turns out that testing the bit vars "inverted" and "bigtext" was not always working after the asm section in gcga subroutine .this only shows up when some vars are pushed out of bank 0 .I can not establish the failure mechanism ,seems i'm just guessing what "CHK?RP" AND "RST?RP" macros actually do . I can't find their definitions anywhere . making the vars into bytes and manually setting correct bank fix the issue.
here is a more complex demo and an amended nokia include file to test and overcome this issue

[wjsmarine]

Hi Richard,

I have compile errors with your new code, NB I've renamed them to NOKIA_DEMO#6 to avoid confusion with previous versions:
[ERROR] nokia_demo#6.pbp (184) : Syntax error
[ERROR] nokia_demo#6.pbp (195) : Syntax error
[ERROR] nokia_demo#6.pbp (195) : Redefiniton of LABEL RJUSTBUFF

which is:

    RJUSTBUFF  buff,4        ;http://support.melabs.com/forum/picbasic-pro-compiler-3-0-and-later/usercommand/983-strtok-usercmd
    RJUSTBUFF  buff,2   ;http://support.melabs.com/forum/picbasic-pro-compiler-3-0-and-later/usercommand/983-strtok-usercmd

What have I missed?

Regards,
Bill

[richard]

What have I missed?

you can't use my RJUSTBUFF user command unless you include the file that defines it .

it can be found at the link in the comment ,its included with the strtok code


http://support.melabs.com/forum/picb...strtok-usercmd

[wjsmarine]

Hi Richard,

Excellent work, thank you. I found my problem - the "strtok.pbpmod" Inc file I used was the older version, somehow I missed the update further down the page on that link.

All works well, now I need to get my head around how you've performed the magic and modify the code to suit my layout and various pages of information shown on the Nokia display.

Once again many thanks for the help, you are indeed an asset to the forum.

Cheers,
Bill

[richard]

somehow I missed the update further down the page on that link.

because I forgot to post it