topic iMX6 DualLite: IPU Test Generator Mode in i.MX Processors

iMX6 DualLite: IPU Test Generator Mode

markusforrer — Thu, 21 Jun 2018 13:23:54 GMT

I'm working on a bare-metal display driver. Actually a test pattern will be displayed: red -> green -> blue -> black -> white -> chess -> gray

I have not activated any test mode. Maybe this pattern will indicate an error (e.g. wrong frame buffer content)?

Thank you for any hints.

Kind regards

Markus

Re: iMX6 DualLite: IPU Test Generator Mode

igorpadykov — Fri, 22 Jun 2018 00:18:50 GMT

Hi Markus

for IPU test mode one can look at sect.19.3 Configuring the CSI Unit in Test Mode

i.MX53 System Development User’s Guide

https://www.nxp.com/docs/en/user-guide/MX53UG.pdf

https://community.nxp.com/message/813460

Best regards
igor
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Re: iMX6 DualLite: IPU Test Generator Mode

markusforrer — Fri, 22 Jun 2018 14:09:12 GMT

Hello Igor

Thank you for you answer.

The thing is, the test mode runs without any activation. The registers to start the test mode are disabled. So I think the test mode (automatic activated) will inform about a mistake in the ipu configuration!?

Best regards

Re: iMX6 DualLite: IPU Test Generator Mode

markwilliams — Fri, 22 Jun 2018 14:59:49 GMT

We have seen similar patterns during development. The LCD source driver ICs on the panel itself have built-in self-test patterns similar to what you describe. Some LCDs have test pins on their interface cables that need to be terminated to prevent entering test mode. It might be worth checking this.

Mark

Re: iMX6 DualLite: IPU Test Generator Mode

markusforrer — Fri, 22 Jun 2018 15:05:56 GMT

Hello Mark

Thank you for your answer.

The hardware should be ok because Linux works fine. It must be a problem with the ipu configuration (bare-metal project).

Did you develop bare-metal too?

Regards

Markus