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adcor
Joined: 21 Feb 2008
Posts: 31
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| Working driver for Sed1520 |
 Posted: Thu Feb 21, 2008 2:53 pm |
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Could anyone share a working driver for SED1520 LCD which works with a glcd.c from ccs library? The one posted a year or so ago does not seem to be working.
thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Feb 21, 2008 3:10 pm |
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It's not working because it was posted with HTML enabled, and the
code is all screwed up. Example:
| Quote: | | if (x<61>8)y-=((Data-184)*8); |
However, I think the correct code is posted on another website:
http://www.picmodules.com/acatalog/Free_Downloads.html
Look for the place where it says you can download this code:
| Quote: | CCS Example Code
SED1520 Graphical LCD Example |
Edited to add:
I will email Darren with instructions on how to disable HTML by
default for all users. There is an option to do it in the phpbb
"User and Forum basic settings" panel:
http://www.phpbb.com/support/documentation/2.0/#section3_2_2_4
Last edited by PCM programmer on Thu Feb 21, 2008 6:37 pm; edited 1 time in total |
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Douglas Kennedy
Joined: 07 Sep 2003
Posts: 755
Location: Florida
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| Posted: Thu Feb 21, 2008 3:20 pm |
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This is a very simple interface so you should not be having any issues.
Some graphic LCD's have dual SED1520's and there can be quirks as to column addressing left side controller right side controller etc. Provide more info as to the LCD you have and whether you have downloaded and read the SED1520 data sheet.
Below is the cmd and data calls to a dual SED1520 122x32 LCD
| Code: | write_cmd(int8 cmd,int8 sed_mode)
{
output_low(PIN_cmd_data); // A0=0 cmd
if (sed_mode==BOTH || sed_mode==LEFT) output_low(PIN_SED_clk1);
if (sed_mode==BOTH || sed_mode==RIGHT) output_low(PIN_SED_clk2);
write_port(cmd);
delay_us(2);
if (sed_mode==BOTH || sed_mode==LEFT) output_high(PIN_SED_clk1); // clkin data d0..d7
if (sed_mode==BOTH || sed_mode==RIGHT)output_high(PIN_SED_clk2);
delay_us(2);
if (sed_mode==BOTH || sed_mode==LEFT)output_low(PIN_SED_clk1);
if (sed_mode==BOTH || sed_mode==RIGHT)output_low(PIN_SED_clk2);
}
write_data(int8 page,int8 col,int8 data)
{
int8 seg,side;
// seg is basically the same as col
/// page is the 8 bit high line on screen line 0 1 2 3
side=LEFT;
seg=60-col;
if (col>60) {
side=RIGHT;
seg=121-col;
}
page=0b10111000+page; // page command now calculated
//// send the page address command
output_low(PIN_cmd_data); // A0=0 cmd
if (side==LEFT) output_low(PIN_SED_clk1);
if (side==RIGHT) output_low(PIN_SED_clk2);
write_port(page);
delay_us(2);
if (side==LEFT)output_high(PIN_SED_clk1); //clk in page
if (side==RIGHT)output_high(PIN_SED_clk2);
delay_us(2);
/// send the segment address command
if (side==LEFT) output_low(PIN_SED_clk1);
if (side==RIGHT) output_low(PIN_SED_clk2);
write_port(seg & 0x7F);
delay_us(2);
if (side==LEFT) output_high(PIN_SED_clk1); // clkin seg
if (side==RIGHT)output_high(PIN_SED_clk2);
delay_us(2);
if (side==LEFT)output_low(PIN_SED_clk1);
if (side==RIGHT)output_low(PIN_SED_clk2);
//// post the data to RAM address pg,seg
output_high(PIN_cmd_data); //A0=1 data
write_port(data);
delay_us(2);
if (side==LEFT) output_high(PIN_SED_clk1); // clkin seg
if (side==RIGHT)output_high(PIN_SED_clk2);
delay_us(2);
if (side==LEFT)output_low(PIN_SED_clk1);
if (side==RIGHT)output_low(PIN_SED_clk2);
}
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Synthex
Joined: 07 Oct 2009
Posts: 5
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| 122x32 (SED1520 or NJU6450A) GLCD Driver |
| Posted: Wed Oct 07, 2009 2:36 am |
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Hello,
Could anyone share a working driver for 122x32 SED1520 or NJU6450A GLCD ?
Thanks a lot ! |
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