Re: [uCsimm] Epson LCD for the uCsimm

From: Edward Benavides (benasmith@earthlink.net)
Date: Wed Nov 01 2000 - 11:12:41 EST


So are these settings that you sent in the crt0.s file?

Tom Walsh wrote:

> Edward Benavides wrote:
> >
> >
> >
> > Hello:
> > I am trying to hook up the Epson LCD with the simm. I have found the
> > schematic and correctly hooked it up both to the LCD and the simm. I
> > can see the screen flicker when power is applied and when I initialize
> > the LCD by hitting envmm the whole screen turns black. So I at least
> > know that it is doing something. I have frame buffer support compiled
> > in the kernel.
> >
> > I dont know where to go from this point and any help would be great.
> >
> > TB
>
> These are the settings that I used for my display.
>
> /* this is for the EG9013 display. */
> movel #splash_bits, LSSA_ADDR /* LCD starting address. */
> moveb #0x28, LVPW_ADDR /* LCD Virtual Page Width Register. */
> movew #640, LXMAX_ADDR /* LCD Screen Width Register. */
> movew #480, LYMAX_ADDR /* LCD Screen Height Register. */
> moveb #0, LRRA_ADDR /* LCD refresh rate. */
> moveb #0, LPXCD_ADDR /* LCD Pixel Clock Divider Register. */
> moveb #0x08, LPICF_ADDR /* LCD Panel Interface Config Register. */
> moveb #0x01, LPOLCF_ADDR /* LCD Polarity Configuration Register. */
> moveb #0x81, LCKCON_ADDR /* LCD Clocking Control Register. */
> movew #0xff00, PCPDEN_ADDR /* LCD pins Port C Pull-Down enb. reg */
>
> You cannot eliminate the flicker, the problem is with the LFLM signal,
> the display requires the signal to be within 12.5 - 13.5 milliseconds,
> the EZ processor can only achive something like an 18 millisecond rate,
> so... you get flickering.
>
> TomW
>
> --
> Tom Walsh - WN3L - Embedded Systems Consultant
> 'www.openhardware.net', 'www.cyberiansoftware.com'
> "Windows? No thanks, I have work to do..."
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