Graphical Displays with PBP3

[richard]

how good is your power supply and your connections ?
reset wont help here if it starts up ok
if you want you can pm me to get my address to send a display to be evaluated

[rocket_troy]

Power supply going into the PIC was a PicKit2 and that doesn't appear to be the issue. I was doing all these tests on a 18F26K22 SOIC package. After you mentioned the power requirements issues, I tried it on the larger DIP package and that appears to have fixed the show-stopping issue of screen regeneration. FILLRECT still doesn't work correctly, but that's a peripheral issue for me. I can at least now use these displays for the apps I had in mind.

Thanks again for all the assistance Richard.

Troy

[richard]

on q43 chips i have to set the high slew rate settings on for really highspeed spi
the k22 has slew rate control SLRCON.2 for portc , can't hurt to try

[rocket_troy]

Worked! I can now run things on the smaller package.

Legend!

Troy

[rocket_troy]

Richard,
Curious Question:
I was feeding a 10bit rotary encoder into the PIC (RB0-RB5 & RA0-RA3) with the display connected and I was stumped to figure out why I wasn't getting any input signal into the PortA pins and also 1 of the PortB pins. After a while I realised they were acting as outputs not inputs even though I declared them as inputs before the display initialisation. After some head scratching, I tried setting their TRIS status *after* the display initialisation and that appeared to fix that. So, I think I can maybe see where the PortB pin may have been set (behind the scenes), but can't see where the PortA pins where set as outputs? Does that have anything to do with the LCDOUT command call in the initialisation instructions?

Troy

[rocket_troy]

Another Question:
In your graphics file for the FillRect code you have:

frect:

s_ystart=y0
s_yend=y0
while y1

s_xstart=x0
s_xend=x0+s_xend-1
gosub dLine
s_ystart=s_ystart+1
s_yend=s_ystart
y1=y1-1

wend

return

Shouldn't that line be s_xend=x1+s_xend-1 ?

Troy

[richard]

Does that have anything to do with the LCDOUT command call in the initialisation instructions?

if you mean the highlighted text below , then yes that an error and should be removed for serial i/f usage
and may impact portb

    ANSELB=0
    ANSELC=0
    ANSELA=0 
    Pause  500      ' LCD initialize time
    lcdout $FE,1
    gosub st7920_init    'graphic mode
    gosub grf_clr
    n=0
    setfont FONT5x7
    ARRAYWRITE BUFF,["- scroll test -"]
    DMDSTR 18,0, Buff,1
    ARRAYWRITE BUFF,["- some  text to    test -"]
    DMDSTR 6,8, Buff,1
    SETFONT bignum
    bgcolour=0
    direction=0
     gosub show
 main:   
    n= n+1

Shouldn't that line be s_xend=x1+s_xend-1 ?

my ver is , you are using an old version , the ver of grx.pbpmod in post 10 has vertical line fixed but fillrect got mangled
post 59 ver has both of those fixed , yet to discover what else may be broken

frect:
    s_ystart=y0
    s_yend=y0
    while y1
        s_xstart=x0
        s_xend=x0+x1-1
        gosub dLine
        s_ystart=s_ystart+1
        s_yend=s_ystart
        y1=y1-1
    wend
return