topic Display configuration in MPC5xxx

Display configuration

tech_mofu — Wed, 14 Jul 2021 16:22:26 GMT

Hi Nxp team,

We are working on xpc560s EVB (176 pin module) for developing low-cost instrument cluster.

We used New Heaven display ( NHD-4.3-800480CF-ASXP-CTP) with lab0 code for this exercise.

We first tried to test the interface between DCU and the TFT LCD panel by using color bar mode.

We could mode two observations from this,

1. When the Invert Horizontal & Vertical Synchronize signals (from SYN_POL Register) is active low we can see the pattern but the color is not matching(attached the image below-colour_bar_H_V_Inv.jpg) as per the COL_BAR1..8 Register.

2.When the Invert Horizontal & Vertical Synchronize signals (from SYN_POL Register) is active high we can see some pattern as per the COL_BAR1..8 Register(Image-colour_bar_H_V.jpg) but some are missing in the sequence.

DCU is configured as per the New Heaven display ( NHD-4.3-800480CF-ASXP-CTP).

RASTER_EN bit was also enabled in this exercise.

Kindly verify which observation is correct and guide us to proceed further.

Thanks

Vivishekh

Re: Display configuration

davidtosenovjan — Fri, 16 Jul 2021 08:28:43 GMT

Hi, do you have correctly connected RGB signals according panel manufacturer's datasheet?

Have you checked AN4187?

https://www.nxp.com/docs/en/application-note/AN4187.pdf

Re: Display configuration

tech_mofu — Mon, 19 Jul 2021 10:23:28 GMT

Thanks David for the inputs.

We did not configure the DE (Display enable) port correctly. Once we configured appropriately at the DCU side it worked.

We tested the Bar graphs and Freescale bitmap display and it worked.

Regards

Raghu