topic Re: 8-bit lcd parallel bus interface in i.MX Processors

8-bit lcd parallel bus interface

reuelhaavrahami — Wed, 29 Aug 2018 06:39:06 GMT

We have a 8-bit parallel bus LCD connected to EIM_A21 (DATA16) to EIM_D27(DATA23). The data to to be sent should be RGB565 but in a 8-bit in two clock clock cycles fashion. I know we should change the microcodes found in ipu_disp.c but I have no clue as of how to do this. We are using Linux 3.14.52.

I tried adding RGB565 to the same if statements for YUYV and added some changes to the _ipu_init_dc_mappings function. but it still does not give me two clock cycles per pixel.

Can someone please help.

Re: 8-bit lcd parallel bus interface

igorpadykov — Wed, 29 Aug 2018 10:49:14 GMT

Hi Reul

number of IPU clock cycles was available for programming in early IPU

versions, for example in i.MX31 IPU DI Display Access Cycles Count Register (DI_DISP_ACC_CC).

Below example of such microcodes programming

https://community.nxp.com/message/294603#294603

Usually such kind of support can be provided with

NXP Professional Services|NXP

Best regards
igor