topic Re: Issue with LCD display Interface on LPC54618J512BD208 in LPC Microcontrollers

Issue with LCD display Interface on LPC54618J512BD208

nithin3200 — Thu, 14 Dec 2023 07:34:41 GMT

Hello,

I am currently engaged in a project that involves the use of the LPC54618J512BD208 microcontroller. I am facing a challenge with the interface of the LCD display(G057VN01V2).

When I attempt to display text, it does not appear as expected. Interestingly, the color blue displays correctly, but other colors do not seem to work.

The SDRAM part number for reference is IS42S32160D-5BL.

For further clarity, I am attaching the configurations of both the LCD and SDRAM.

Any help or suggestions would be greatly appreciated.

Re: Issue with LCD display Interface on LPC54618J512BD208

frank_m — Thu, 14 Dec 2023 08:43:29 GMT

> When I attempt to display text, it does not appear as expected. Interestingly, the color blue displays correctly, but other colors do not seem to work.

I think the problem is in your code.
Check the color mode you are using, and alignment of the respective bitfields in one color RAM word.
Like, one of the common 16-bit color modes used in LCDs is 5-6-5 (RGB).

Re: Issue with LCD display Interface on LPC54618J512BD208

nithin3200 — Thu, 14 Dec 2023 10:21:21 GMT

Thank you for your response.

I am proceeding in the same manner as you suggested. If you could review my LCD and SDRAM configurations, you might understand the situation better. For further clarity, I am also attaching the clock configuration

Re: Issue with LCD display Interface on LPC54618J512BD208

Alex_Wang — Fri, 15 Dec 2023 06:18:56 GMT

Hello, @nithin3200

Hello, we recommend that you use GUI Guider software for design, after the generation of the code for a simple port, you can display the effect you want.

Best regards, Alex.

Re: Issue with LCD display Interface on LPC54618J512BD208

frank_m — Fri, 15 Dec 2023 07:06:13 GMT

I wouldn't think it is a clock issue if at least one color is displayed correctly.

As a side note, I am not an NXP employee or have any such board currently, so I have neither the time nor the hardware to get too deep into your issues. But I can share my experiences.

Having dealt with LCD display controllers in the past, the sparingly documented register interface can be a challenge and usually requires some experimentation. The applies to both geometry (sizes & orientation) and colors.
For the geometry settings, I used to draw a diagonal line onto the display (just increment x and y coordinated simultaneously.
For color, I used lines/blocks of one primary color (R, G or B), side by side. Intensity variations and gradients follow afterwards.

Re: Issue with LCD display Interface on LPC54618J512BD208

Alice_Yang — Thu, 21 Dec 2023 09:26:04 GMT

Hello @nithin3200

There is a demo and AN can refer to:

https://www.nxp.com/docs/en/nxp/application-notes/AN12027.zip

Alice