GDSTx library in teensy 4.1 (teensyduino 1.60-beta2) and NHD 5" FT813, Arduino IDE 1.8.19. Loaded from the SDIO reader using SdFat V2.2.3. The memory used is a 256Gb Canvas Go Plus microSD, formatted in exFat. The two png files appear normal

Hello,

Thank you for your question.

The BT81x series co-processor engine can encounter faults, and fault conditions can be read back from an area in RAM, please see section 5.7 of the BRT_AN_033 BT81X Series Programming Guide. A fault recovery procedure can also be found within this section of the programmers guide.

In the first instance I would verify if a co-processor fault has occurred, after this you can also verify that the REG_FRAMES register is still incrementing as this indicates how many frames have been rendered to out to the LCD, which will give you and indication if EVE is still outputting to the screen, if this is not the case you could perform a reset on the IC.


Best Regards,
BRT Community

Hello brt comminity,

i am working on project which is some kind of medical plasma high voltage generator. The spark produces a lot of EMI noise and diplay sometimes stucks. I need to investigate where is the problem and do proper EMC and SW hooks to solve it. My vision is to read some error or status registers and based on it do a proper action. Is there something like that? I am looking into datasheets and prog. guides but i cant find anythink like that. Can somebody suggest me something?

Best regards.

Hello,

Thanks a lot to take some time to test on an other platform.

I should have some side effect with this very file, but I don't see what's the problem yet. The co-processor send a 0xFFF result from the write command register when checking for some room after the first block transfer.
By the way, for working images,  the GetProps command returns the memory address where a PNG bitmap is expanded, but the end of the buffer, not the beginning. Is it normal ? it is not what i understand when reading the BT81X programming manual. The width and heigh are right, but I didn't expect to get this memory value. I was expecting the same value than the one given to the LOADIMAGE_CMD command.

Continue investigations...

Jerome.

Hello,

I’ve attached the example project and screenshot for your reference. Please review the project for better clarity.

Please review the Page1 and Page2 under Switch Page (as shown in the screenshot).

Please let us know if you have any questions on this.

I tested both 1 and 2 png files on ESE 4.10 and FT813 based platform. They are working well.

See the picture enclosed.

Hello,

I'm using this command to decode PNG bitmap from a MCU (PIC32) into a BT812.
I had some of them that failed the decoding.
With a PNG editor, I saw, for example, that embedded ICC profiles are refused by the BT812, which is fair. As soon as I removed this chunk, the bitmap was decoded normally.
All my bitmaps are ARGB8 ones and expected to be decoded as ARGB4. And, of course, all the transfers are always 4 bytes aligned.

Now, i have a small PNG image, with nothing special that is not decoded by the BT812 and I don't know why. I tried to read/write with some drawing utilities, but it's still failing.
Here I join two bitmaps. The "One.png" fails but the other one "Two.png" is read correctly. they have the same size and same internal structure.
What are the exact requirements for PNG decoding and what is wrong with this one ?

Thanks in advance,

J.Prévost

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