SSD1306 start display problem

[harryweb]

Hi,
I'm trying to use an adafruit 0.96" 128x64 OLED. using SPI
I want to draw some graphics (BIG numbers in this case 30x48 pixels each)
I don't want to draw the entire display (1024 bytes) to place my number at the center (by example) of the screen.
I would like to just send 180 bytes of my little graphic
So I try this code: (part)

zero:

low dc : PAUSEUS 10            'mode command
val = $20                      'set mem addr mode
gosub send
val = 1                        'mode vertical  (with $20 above)
gosub send
val = $22                      'setup page start & end addr
gosub send
val = 1                        'start page 1 (page 0 not used) High caract = 6 bytes ... 8 possible
gosub send
val = 6                        'end page 6 (page 7 not used)
gosub send

val = $21                      'set colonne start & end
gosub send
val = 49                       'would like to place at the center so at row 49  (start)
gosub send
val = 78                       ' end
gosub send

high dc : PAUSEUS 10           'mode display


for tab = 0 to 179
lookup tab,[$00,$00,$FF,$FF,$00,$00,$00,$F8,$FF,$FF,$0F,$00,$00,$FF,$FF,$FF,$7F,$00,_
$C0,$FF,$FF,$FF,$FF,$01,$E0,$FF,$FF,$FF,$FF,$03,$F0,$FF,$FF,$FF,$FF,$07,_
$F8,$FF,$FF,$FF,$FF,$0F,$FC,$FF,$FF,$FF,$FF,$1F,$FE,$FF,$FF,$FF,$FF,$3F,_
$FE,$7F,$00,$00,$FE,$3F,$FE,$07,$00,$00,$F0,$3F,$FF,$01,$00,$00,$C0,$7F,_
$FF,$01,$00,$00,$C0,$7F,$FF,$00,$00,$00,$80,$7F,$FF,$00,$00,$00,$80,$7F,_
$FF,$00,$00,$00,$80,$7F,$FF,$00,$00,$00,$80,$7F,$FF,$01,$00,$00,$C0,$7F,_
$FF,$01,$00,$00,$C0,$7F,$FE,$07,$00,$00,$F0,$3F,$FE,$3F,$00,$00,$FF,$3F,_
$FE,$FF,$FF,$FF,$FF,$3F,$FC,$FF,$FF,$FF,$FF,$1F,$F8,$FF,$FF,$FF,$FF,$0F,_
$F0,$FF,$FF,$FF,$FF,$07,$E0,$FF,$FF,$FF,$FF,$03,$C0,$FF,$FF,$FF,$FF,$01,_
$00,$FF,$FF,$FF,$7F,$00,$00,$F8,$FF,$FF,$0F,$00,$00,$00,$FF,$7F,$00,$00],val  ' Code for char 0

gosub send                  ' send data
    
pause 10                    ' to see it slowly
next tab
return

but it doesn't start at row 49... Always at ROW 0 !



I tried to see code from others (arduino too but they use libraries so... just crazy) but I can't see what's wrong.
Any help ?
Regards

[harryweb]

OK... I know what's wrong. This is not my code ! It's because of the bad simulation of the SSD1306 with proteus software :-( I took a real 0.96" OLED display and it works fine without any change of my code.