BS2SX and ASI-204B LCD
kkeennoo
Posts: 2
Have been trying all morning to get this parallel LCD to work with my stamp. Anyone using one successfully? Any special tricks required to make it work?
All Shore ASI-G-2048B-CYS, uses Samsung KS0066 Controller
Pin Function
1 Vss
2 Vdd
3 Vo
4 RS
5 R/W
6 E
7-14 DB0-DB7
15 BL Anode
16 BL Cathode
I have tried every demo program I can find on this forum, and none of them work. I rewired/recoded from 4-bit to 8-bit and back to 4-bit. Triple checked all the connections. I even checked the timing with an o-scope. Everything seems to be working good right up to the LCD, but I never get anything other than the backlight to display. Backlight LED is 4.2v (120mA), driven by BOE 5V regulator through a 6.8 ohm (1/4W) resistor. 10K contrast POT is connected to Vdd, Vo and Vss, and I have also tried just grounding Vo. I have a 9V DC wall transformer powering BOE.
My latest wiring follows this schematic:
http://forums.parallax.com/attachment.php?attachmentid=47199
The attached code (and many versions of tweaks) does not work for me:
At this point, I am ready to toss the LCD...unless someone can tell me of a test mode for it. I didnt buy it new, I salvaged it from a front panel that was on a server being tossed out, and I never actually saw the panel working.
Thanks...
All Shore ASI-G-2048B-CYS, uses Samsung KS0066 Controller
Pin Function
1 Vss
2 Vdd
3 Vo
4 RS
5 R/W
6 E
7-14 DB0-DB7
15 BL Anode
16 BL Cathode
I have tried every demo program I can find on this forum, and none of them work. I rewired/recoded from 4-bit to 8-bit and back to 4-bit. Triple checked all the connections. I even checked the timing with an o-scope. Everything seems to be working good right up to the LCD, but I never get anything other than the backlight to display. Backlight LED is 4.2v (120mA), driven by BOE 5V regulator through a 6.8 ohm (1/4W) resistor. 10K contrast POT is connected to Vdd, Vo and Vss, and I have also tried just grounding Vo. I have a 9V DC wall transformer powering BOE.
My latest wiring follows this schematic:
http://forums.parallax.com/attachment.php?attachmentid=47199
The attached code (and many versions of tweaks) does not work for me:
At this point, I am ready to toss the LCD...unless someone can tell me of a test mode for it. I didnt buy it new, I salvaged it from a front panel that was on a server being tossed out, and I never actually saw the panel working.
Thanks...
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