Raspberry Pi Forums

aBUGSworstnightmare

Just a note: remember the pull-ups!

aBUGSworstnightmare

Sounds like an ESD discharge into the Pi's HDMI. There is the risk that your Pi got damaged.
Have you tried a different monitor btw?

aBUGSworstnightmare

Tested some display stuff (my DPI to LVDS boards) with ubuntu mate. As far as I remember there should be a config.txt somewhere

On ubuntu I would look for /boot/firmware/usercfg.txt as I think thats the one you need to edit (but not sure as I've not used 19.10 yet)

aBUGSworstnightmare

Do us a favour and use edid-decode.

Make sure to install it by 'sudo apt install edid-decode' and then run it on your edid data

I learned that parse-edid will give incorrect output so I stopped using it and use edid-decode instead.

Code: Select all

 tvservice -d some-edid
edid-decode < some-edid

aBUGSworstnightmare

I did not check your OLED data sheet, but DPI is as the name says a parallel interface.

Look here for details https://www.raspberrypi.org/documentati ... /README.md

Look at the picture how mode 5 outputs 18bit data , and how GPIO is used dor output

aBUGSworstnightmare

Edid block of which device? Run edid-decode on it an post the output. Your TV seems to be UHD; have you enabled 4k@60Hz? Here is a how-to for debugging display problems https://www.raspberrypi.org/documentation/configuration/config-txt/video.md As your using several devices in the signal chain I wou...

aBUGSworstnightmare

One command is used incorrectly! It's edid-decode.

Make sure to install it by 'sudo apt install edid-decode' and then run it again.

I learned that parse-edid will give incorrect output so I stopped using it and use edid-decode instead.

aBUGSworstnightmare

Please post results of: tvservice -s tvservice -l tvservice -d 10in-edid edid-decode < 10in-edid As you're suffering from 'screen blinking' you should set the output format to VGA 60Hz (hdmi_group=1 and hdmi_mode=1; changed in config.txt) first and reboot your Raspberry Pi before doing this. As an o...

aBUGSworstnightmare

Okk so to summarize, the csi and dsi on the pi are differential lines, explaining why they do not provide pin muxing. I call this a good reason to say we cannot use them for another purpose. Exception with i2c interface of the hdmi which can be used for something else with the right config. correct...

aBUGSworstnightmare

To get it right: your intention is to connect the RPi 7in to your STM board, right? As STM offers an adapter they should offer a 'display driver' (speaking of software here) as well. If you only need to know the I2C communication I would recommend to connect a logic analyser and sniff the init seque...

aBUGSworstnightmare

Maybe the future will bring us a Raspberry 4 Compute Module which follows an industry standard in regards of form factor and interface (I/O pin assignment) ...

aBUGSworstnightmare

Is there some way to automatically deactivate touch screen on DSI and swith output on two hdmi monitors? (without disconnecting the cables, but eg with the possibility to switch off some wires from the dsi manually- ie hw touch display switch, disconect power on dsi cable...)??? 7in DSI display nee...

aBUGSworstnightmare

james2020 wrote: RPi 4B has DSI+HDMI0+HDMI1 three connect port
Why can only display DSI+HDMI0 or HDMI0+HDMI1

Have any solution to display DSI+HDMI0+HDMI1 on Raspbian?

you missed DPI and Composite output. So in therory the RPi can be connected to 5 displays ...

Only two outputs can be used at a time.

aBUGSworstnightmare

Make sure to use : - the HDMI connector next to the USB-C socket (as HDMI1 will only output 4k @ 30Hz) - use a HDMI2 input on your TV - add 'hdmi_enable_4kp60=1' to your config.txt to enable 4k@60Hz output If this still fails follow the commands I used in this thread and post your results. https://w...

aBUGSworstnightmare

The only 'kind of multiplexing' for MIPI which I'm aware of is lane swapping. But the interface is still MIPI compliant and will not allow for connecting anything else to it.

And, btw. I'm also not the 'average RPI user'

aBUGSworstnightmare

You can not repurpose DSI and CSI!

aBUGSworstnightmare

... And I recently found out that I can place live Raspberry camera preview windows on different displays concurrently (7" DPI and HDMI0 (HDMI2VGA TV) in below photo). Connecting 2nd HDMI monitor will allow for 3rd display with camera preview if needed. I have no experience with SDTV, but maybe eve...

aBUGSworstnightmare

GPIO pins are not intended for powering something! Your sensors have a data sheet, search the web for them and you know each sensors max requirement. Now design a suitable DC/DC (or buy annoff-the-shelf board) that is able to supply your sensors. Only the communication interfaces (i.e. SPi, UART, I2...

aBUGSworstnightmare

: Google Nexus 7 Gen1 display; IMG_1189.jpg (68.61 KiB) Viewed 1622 times

... and yes! It can drive the Nexus 7 Gen1 display too

aBUGSworstnightmare

I can only see two wires (black/red) on OP pictures

aBUGSworstnightmare

Sorry, but now I'm getting confused!
You plugged it in to a monitor? With the 7in disconnected ir connected?

And: use a power supply! Power banks are designed for charging mobile equipment, not for supplying high current continiously

aBUGSworstnightmare

Remove the jump wires and use two USB power supplies (one for your Pi, the other goes to the microUSB connector of your 7in.
If this fails as well do as adviced by Dougie

aBUGSworstnightmare

Have you checked your power supply? Whar are you using?

aBUGSworstnightmare

Show us how it is connected to your RPi and let us know which power supply you're using.

aBUGSworstnightmare

even a Pi Zero can drive two displays (DPI + HDMI) with latest OS.
Using the official 7in touch display + HDMi monitor is trivial on RPi4. On older models the GPU maximum supported resolution (with FKMS) is 2048x2048 pixels.

Search found 2013 matches

Re: Looking for 5" LCD goodness

Re: Spark on hdmi port while connecting monitor and pi -> No hdmi signal + booting failure

Re: RPi 4 with Ubuntu 19.10 not displaying on HDMI

Re: STICKY: HOWTO: Create Custom HDMI modes

Re: DPI Specifics

Re: STICKY: HOWTO: Create Custom HDMI modes

Re: STICKY: Setting up HDMI output when video output is wrong.

Re: STICKY: Setting up HDMI output when video output is wrong.

Re: Using DSI or CSI for another purpose?

Re: Compatibility to RPI 7" DSI Screen (P/N 8997466)

Re: Raspberry Compute Module & Jetson Nano SO-DIMM pins

Re: Pi4 + 7in touch + hdmi

Re: Touch Screen and two monitors

Re: P4b 4gb - poor graphics quality on a 4k monitor

Re: Using DSI or CSI for another purpose?

Re: Using DSI or CSI for another purpose?

Re: Is anyone really using dual 4k drivers on Rpi4?

Re: Which Power solution for a several sensors project?

Re: LVDS add-on for Raspberry models with 40pin GPIO

Re: Official touchscreen won’t display: vertical lines

Re: Raspberry Pi Foundation Display causing performance issues?

Re: Official touchscreen won’t display: vertical lines

Re: Raspberry Pi Foundation Display causing performance issues?

Re: Official touchscreen won’t display: vertical lines

Re: Pi 4B Simultaneous FFC and HDMI display