topic Re: Signature Unit in iMX8QM in i.MX Processors

Signature Unit in iMX8QM

MHassan1 — Wed, 08 Dec 2021 13:17:17 GMT

Hello,

I am working on Core m4 in Imx8qm , and I am supposed to configure Signature unit to calculate CRC over display rendering from m4.

But in oreder to do so , I need to provide this API

DPU_SetSignatureWindowRefCrc(DPU_BASE, DISPLAY_INDEX, 0, redCRC, greenCRC, blueCRC) With Reference redCRC, greenCRC, blueCRC in order to be checked against what calculated from Signature unit.

So My question is that, Is there a component or a mechanism describe how to calculate CRC the same way signature unit do, because other than that, Signature unit will always failed in that comparison.

And if not, So how Signature unit supposed to work in that way, As it is not logical to set the reference values with the same values that calculated from Signature Unit itself like what implemented in SDK example

boards/mekmimx8qm/driver_examples/dpu/signature/cm4_core1/dpu_signature.c

Thank you,

Re: Signature Unit in iMX8QM

Juan-Rodarte — Tue, 14 Dec 2021 02:51:59 GMT

Hi Mahmoud,

Which SDK are you using?

Re: Signature Unit in iMX8QM

MHassan1 — Wed, 15 Dec 2021 11:34:08 GMT

Hi Juan,

Thank you for your feedback.

I am using SDK_2_5_2_MIMX8QM6xxxFF as it is the latest SDK with Signature unit example.

Thank you,

Re: Signature Unit in iMX8QM

Juan-Rodarte — Mon, 07 Mar 2022 03:39:51 GMT

Hi,

I share a link for more information.
https://mcuxpresso.nxp.com/api_doc/dev/1694/a00014.html#ga77322b7b303eb2ed8d55ad4032ea10b1

Regards.

Re: Signature Unit in iMX8QM

fmonte — Fri, 29 Jul 2022 13:12:24 GMT

This does not answer the question. Your link (that is just a doxigen of fsl_dpu.h) does not specifie the CRC type.

Re: Signature Unit in iMX8QM

MHassan1 — Mon, 15 Aug 2022 08:20:48 GMT

Exactly, This actually has nothing to do with the CRC type for signature unit. And for me without knowing this point, Signature unit seems to be very useless for dynamic graphics.