RT1052 LCD 2bpp

[mark82]

Good morning.

I'm working on a project porting which required to drive a 4.3" LCD (480x272 resolution, RGB565) with 2bpp image. This was natively supported within LPC1788 MCU, whose LCD driver allows 2bpp framebuffer. 

Porting this project to RT1052, it seems that this is not possible. The most that I can achieve is 8bpp via LUT tables provided by the LCDIF peripheral of RT1052, thus wasting 6bits each byte of framebuffer. Basically I only need 4 colors to be displayed. Do you confirm this, or can I configure the LCDIF and framebuffer somehow to allow truly 2bpp? 

I read the AN12302 which at page 11 briefly deals with LUT showing an example of 3bpp palette mapped to an output of RGB565. Attached image of this table. In such a case, would 5bits (of each byte in framebuffer) be unused?

Regards,

Marco

[jeremyzhou · Accepted solution]

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) Can I configure the LCDIF and frame buffer somehow to allow truly 2bpp?
-- No.
2) In such a case, would 5bits (of each byte in frame buffer) be unused?
-- Yes.
Have a great day,
TIC

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