LCD interface 16 bit RGB (split)

reuelhaavrahami — Thu, 06 Sep 2018 05:19:03 GMT

We have an LCD connected to Data0 (EIM_DA9) through to Data11 (EIM_EB0) and Data20 (EIM_D31) through to Data23 (EIM_D27). The pins EIM_A17 (Data12) through to EIM_A24(Data19) are connected to a camera interface.

We are sending data in RGB565 format. The ipu_disp.c we changed as follows (line867)

_ipu_dc_map_config(ipu, 3, 0, 4, 0xF8);
_ipu_dc_map_config(ipu, 3, 1, 10, 0xFC);
_ipu_dc_map_config(ipu, 3, 2, 23, 0xF0);

However we lose the lowest bit of the R-component as this has to be at a different offset than the high-bits of the R-component, since the camera interface splits up the R-component.

Is there a way (perhaps by _ipu_dc_map_link()) to gain this "lost" lower-R-component-bit?

We are using Linux kernel 3.14.52

Thanks

Re: LCD interface 16 bit RGB (split)

igorpadykov — Thu, 06 Sep 2018 23:20:26 GMT

Hi Reuel

for ipu mapping scheme one can look at

Figure 37-33. Example of Data Packing for Writing Data to the Display

i.MX6DQ Reference Manual, seems there is no way to configure it properly in splitting case

http://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

Best regards
igor
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topic LCD interface 16 bit RGB (split) in i.MX Processors

LCD interface 16 bit RGB (split)

Re: LCD interface 16 bit RGB (split)