I have written some routines for the SP 5-GFX1 from Lascar Electronics 
www.lascarelectronics.com, it also uses the Sunplus SPLC501C.  It uses 
the serial interface but the startup routine might help.  Look at 
function gfx1_start_up() in the file gfc1_ser_dr.c.  Also note that 
things like column addresses may not be where you expect them because it 
depends on the physical COG connections..
http://www.geocities.com/g13685/sub_index.html

Regards

Ian

Mauricio Jancic wrote:
> Hello,
> 	I've been dealing with this for a week now and haven't yet found a
> solution, perhaps someone here had a similar experience.
>
> 	I'm using a NewHaven graphic lcd (128x64 part no.
> NHD-LGC12864CZ-FSW-GBW). It's a COG LCD with a SPLC501C controller chip.
>
> 	I bought some LCD routines from embedded-code.com and I'm trying to
> make everything work.
>
> 	The main problem is the initialization routine of the LCD. Since the
> LCD routines are licence protected I can post the code, but I'll post some
> bits of information:
>
> First, the initialization routine, as described on the datasheet is:
>
> 	lcd_set_reset_pin(0);
> 	lcd_delay_ms(2);
> 	lcd_set_reset_pin(1);
> 	lcd_delay_ms(20);
>
>
> 	//----- DO THE CONFIGURATION COMMAND SEQUENCE -----
> 	wrt_cmd(0xa2);
> 	wrt_cmd(0xa0);
> 	wrt_cmd(0xc8);
> 	wrt_cmd(0x25);
> 	wrt_cmd(0x81);
> 	wrt_cmd(0x10);
> 	wrt_cmd(0x2F);
> 	wrt_cmd(0xAF);
> 	wrt_cmd(0xA5);
> 	
> 	while(1);
>
> This should initialize the LCD and show a screen with all the dots ON
> (command 0xA5).
>
> The wrt_cmd() routine is the following:
>
>
> 	LCD_DATA_BUS = data;
>
> 	//Setup control pins
> 	LCD_CS1 = 0;
> 	LCD_RW = 1;
> 	LCD_RD = 1;
> 	LCD_DC = 0;						//DC low for
> a command
>
> 	ACCESS_DELAY;
> 	//Latch in the byte
> 	LCD_RW = 0;
> 	ACCESS_DELAY;						//Pause
>
> 	LCD_RW = 1;
>
> 	LCD_CS1 = 1;
>
> My control pins C86 and PS in the LCD are set to LOW and HIGH respectively.
>
> The main problem I found is that the built in inverter is not working,
> because I don't see the expected voltages on pins V1 to V5, all of them have
> 3.25 v (that's the LCD voltage).
>
> I'm attaching the schematic, should it clarify more.
>
> Any help you can provide will be appreciated.
>
> Regards,
>
> Mauricio
>   
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