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LCD character pattern

 
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Guard



Joined: 20 Jan 2005
Posts: 43

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LCD character pattern
PostPosted: Thu Mar 17, 2005 8:07 am     Reply with quote
Hi,

Do you know code for write character pattern on lcd?
Thanks
ljbeng



Joined: 10 Feb 2004
Posts: 205

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PostPosted: Thu Mar 17, 2005 8:30 am     Reply with quote
A character is sent to the lcd with RS line held high.

Commands are send the same way with RS held low.

To do custom characters, you need to define the bit pattern with 8 byte values:

Code:
BYTE const lcd_custom[8] = {
     0x1f,0x11,0x0a,4,0x0a,0x11,0x1f,0,   //;picture of hour glass
     };


First, initialize the lcd like normal.

Next you need to send 8 bytes to the lcd with RS held low. Be sure to send 8 bytes for each custom character. Each byte maps which squares are on or off for a single line of the 5 x 8 character block.
nibble



Joined: 20 Jul 2005
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PostPosted: Wed Jul 20, 2005 12:19 pm     Reply with quote
Hi
How can i read character pattern from CGram?
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Wed Jul 20, 2005 6:03 pm     Reply with quote
Read that RAM address.
treitmey



Joined: 23 Jan 2004
Posts: 1094
Location: Appleton,WI USA

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PostPosted: Thu Jul 21, 2005 7:56 am     Reply with quote
For custom characters on a graphic LCD I use fontgen.
http://www.ccsinfo.com/forum/viewtopic.php?t=23640&highlight=lcd+font
I am nibble
Guest
PostPosted: Thu Jul 21, 2005 11:50 am     Reply with quote
I am using alphanumeric LCD.
I put rs to 0 and write to 0x40 for CGRAM address
then I put rs to 1 and write the chr pattern. ( 8 byte)

How read the ddram?
Thank
I am nibble
Guest
PostPosted: Thu Jul 21, 2005 12:08 pm     Reply with quote
I don't use R/W pin
Mark



Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA

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PostPosted: Thu Jul 21, 2005 2:26 pm     Reply with quote
R/W
R = Read
W = Write

See if you can figure it out
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