Read: 5076 times
|#170861 - Nokia 3310 (PCD8544) problem|
I have built a program for driving the Nokia 3310 LCD. I bought 2 of these LCDs recently, while I had another older one with me(without the plastic frame). Now I am facing a problem interfacing these new LCDs that the display is garbled on both. The older one displays correctly (as in Proteus):
What I am getting on both new LCDs is:
The older LCD:
see also the difference in graphics display for older & newer:
The newer LCDs are not displaying the top 2 rows of the image & the last 11 rows of the LCD are always filled with random(?) dots. I also think the LCD is writing some data off-screen as some characters are not visible at all. I am using 5V for all the LCDs (according to some websites) & here's the (standard) initialization:
lcdcmd(0x21); // Activate Chip and H=1. lcdcmd(0x80 + 90); // contrast value (0 to 127): 60 enough for old LCD & 90 for new lcdcmd(0x13); // Adjust voltage bias. lcdcmd(0x20); // Horizontal addressing and H=0. lcdcmd(0x09); // Activate all segments. clrdisp(); // Erase all pixel on the DDRAM. lcdcmd(0x08); // Blank the Display. lcdcmd(0x0C); // Display Normal. pixelXY(0,0); // Cursor Home.
The commands for setting contrast work (but different values for old & new, as you can see above)
So finally here are my queries:
1) I suspect it is some different controller than PCD8544 (http://www.edaboard.com/ftopic324477.html). Is anyone aware of a different controller than this in Nokia 3310 LCD?
2) Is 5V safe for this LCD/controller? datasheet says 7 V is absolute max.
3) I saw some people talking about setting an offset. What is it & how to use it? Cant find anything in the datasheet...
|Nokia 3310 (PCD8544) problem||MUNISH KUMAR||11/16/09 05:02|
|Look here?||Andy Neil||11/16/09 07:13|
|already seen...||MUNISH KUMAR||11/16/09 13:37|
|Some observations & pwned !!!||MUNISH KUMAR||11/17/09 00:13|
|where'd u get the LCD?||Siddharth Das||11/17/09 20:19|
|Thanks!!!||MUNISH KUMAR||11/18/09 06:08|