DS90UB941AS-Q1: DS90UB941AS-Q1 translation to DS90UB948 LVDS with SPWG format

Evan Williams

Part Number: DS90UB941AS-Q1
Other Parts Discussed in Thread: AM67

Tool/software:

I'm using TI SDK 10 with AM67 and am having difficulty displaying an image to a screen using the 941 -> 948 configuration.

Our LVDS displays use MEDIA_BUS_FMT_RGB888_1X7X4_SPWG, so it isn't clear to me how the DS90UB948 could do the translation to the proper format for our displays.

I see the MAPSEL pin needs to be set HIGH? Is this sufficient?

2 days ago

0 Ragav Subramanian 1 day ago

TI__Expert 3778 points

Hi Evan,

It seems like this may be a driver issue. You will have to find a driver that outputs the data as the 941as expects or convert the data from the driver to the output expected for 941as.

The MAPSEL will not fix this data formatting difference.

Thanks,

Ragav Subramanian

0 Evan Williams 1 day ago in reply to Ragav Subramanian

Intellectual 565 points

Hi Ragav,

I found on TI SDK 10 and AM67, the DSI0 peripheral hits an error when I use too wide of horizontal value? Perhaps >800.

There is a DSI0 register that hits HSYNC_ERR, so seems internal to the peripheral, something related to DRM or DSS.
I'm hoping to find a proper DSI0 driver which can output continuously at 1280x800. I found a driver which outputs as 800x1280, but this is the wrong resolution for us.

0 Ragav Subramanian 1 day ago in reply to Evan Williams

TI__Expert 3778 points

I found this page of linux drivers. I am not sure if ths is applicable for your application but sharing as a resource for drivers:

https://docs.kernel.org/userspace-api/media/v4l/subdev-formats.html

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DS90UB941AS-Q1: DS90UB941AS-Q1 translation to DS90UB948 LVDS with SPWG format