LPC4357 TFT Display 4Bit each colour without external RAM

[lpcware]

Content originally posted in LPCWare by Georg on Mon Dec 01 01:04:57 MST 2014
Hi,

i use a LPC4357 with a small TFT (320x240) display. This display is connected over 16Bit HW-Interface
and work fine. But for this funktion i need a external ram for the framebuffer.

I need a solution to run this TFT without external RAM. I would use it with 4bit each colour.
But i don't understand how to initialise the colourpalette for this mode.

Can someone give me some examples or help to initialise the tft.
Cursor works fine in 4Bit mode.

thx.

Georg.

[lpcware]

Content originally posted in LPCWare by Georg on Mon Dec 15 03:56:18 MST 2014
Hi,

i need only to know how to config the LCD-Controller from LPC and the
Color Palette registers to run my display with 4 Bit and so save memory.
Ich will only use internal memory of LPC µC.

Thx.

Regards,

Georg.

[lpcware]

Content originally posted in LPCWare by Georg on Tue Dec 02 03:47:15 MST 2014
Hi,

i Use a Onation OT035AQDDDT display with a HX8238 controller onbaord.
I drive this display wit the 16-bit HW-Interface and i use the lcd-controller from lpc.
For framebuffer i use the external RAM. But i need a solution without ext. RAM.
4Bit colourdepth is enough for my application.

I can configure the lpc lcd-controller to work with 4Bit. But i can not display some
colours. Only the cursor for my touch works and is displayed on lcd.

Thx.

Regard,
Georg.

[magdiel3]

How did you manage to do so?

[lpcware]

Content originally posted in LPCWare by Martin84 on Tue Dec 02 02:53:08 MST 2014
Which TFT is it? May be a Sainsmart-TFT? I think your TFT has an internal LCD Controller (i.e. SSD1289) which you drive with the 16-bit HW-Interface. These LCD Controllers have a internal RAM as Framebuffer which you can use. But I don't know if you can use this TFT-Framebuffer with the LPC LCD-Controller.

If there's such a LCD-Controller like the SSD1289 you can drive the TFT with the LPC EMC or with GPIO-Lines.

Regards,

Martin