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Electronics => Projects, Designs, and Technical Stuff => Topic started by: luigi on February 20, 2019, 04:50:17 pm

Title: How to convert HDMI to MIPI DSI (1920x1080)
Post by: luigi on February 20, 2019, 04:50:17 pm

I am trying to drive a FullHD LCD display from HDMI signal.
The display requires MIPI DSI signal and for that I will need to perform this conversion. The de facto standard IC for this job is the TC358779XBG/TC358870XBG for UHD. (The datasheet is attached)
However in the datasheet available to download from Toshiba it is not specified how to configure the chip's internal registers by the I2C interface.
Without that information the chip is useless. And I guess that this lack of information is due to something related to the HDMI license or whatever other commercial reason.
I must integrate the chip into my own board so I can't use the cheap chinese boards already available.
I believe that this kind of conversion is possible using FPGA but that is out of my current skill set.
I am aware of the project from hackaday.io using Spartan6 but probably will require me to customize the code to fit my particular LCD.

Anyone has any suggestion regarding these comments?

Title: Re: How to convert HDMI to MIPI DSI (1920x1080)
Post by: Andrey_irk on February 21, 2019, 12:59:16 am

Yeah DS for the chip doesn't seem to be available. I've only found a thread on NXP's website where a guy was trying to create a driver for it.
https://community.nxp.com/thread/481534
There is his mail. Try to contact him, maybe he'll help.
Did you consider using microcontrollers to do that? I know that it'll be more labour-intensive (even if you find one supporting both interfaces), but it may be better than paying $$$ for a datasheet.
In the thread the other guy mentions I.MX 8M evaluation kit that is exactly what you're trying to build.

Title: Re: How to convert HDMI to MIPI DSI (1920x1080)
Post by: Andrey_irk on February 21, 2019, 01:05:49 am

https://datasheet.octopart.com/TC358870XBG(EL,H4)-Toshiba-datasheet-33023052.pdf
Similar thing, but with all the necessary information.

Title: Re: How to convert HDMI to MIPI DSI (1920x1080)
Post by: ebclr on February 21, 2019, 03:53:16 am

https://item.taobao.com/item.htm?spm=a230r.1.14.67.34ea5e89LOPd86&id=545962298653&ns=1&abbucket=20#detail

Title: Re: How to convert HDMI to MIPI DSI (1920x1080)
Post by: luigi on February 23, 2019, 03:58:25 am

Quote from: Andrey_irk on February 21, 2019, 01:05:49 am

https://datasheet.octopart.com/TC358870XBG(EL,H4)-Toshiba-datasheet-33023052.pdf
Similar thing, but with all the necessary information.

I think you just saved me $10K.
Somehow I did not look on Octopart, because I assumed that all PDFs available online were equal than the first 5 results on Google...
Thanks!