Hi!
I was thinking of a similar project, since im going to go studying soon and wanted a laptop in the form factor of MS surface laptop studio, but the reviews are mediocre and ive had bad experience with surface devices in the past and i really want a framework laptop instead.
I was just about to ditch the idea since it might be too complicated electronically but after seeing this post and seeing how recent it is, I cant stop thinking of it!
I immediately signed up to the forum and I’d be down to ordering a framework laptop and the display panel just for this project to maybe help design a case for it in the style of the MS surface laptop studio (which, in my opinion, is more convinient to switch between laptop mode and tablet mode).
I’m going in another direction. trying to make a 17" 2in1 tablet/cyberdeck in a pelican 1490 case. I took the screen out of an inspirion 9700 4k 16:10 17". I just need to get the touchscreen working.
I know this Post hast quote an age, but as You still use the Trackpad I2C for Touchscreen I came to cross-read the Motherboard Interface spec and the i2c Interface table as configured in EC. Seems that the Touch Screen I2C is I2C0 - and it’s configured to connect a HID conformal Slave. So with the right config it should work…
Thank you for the suggestion. I looked at the schematics and the EC firmware for my AMD 7040 motherboard and i2c port 0 is configured to be a slave in the EC. Unfortunately the touchscreen pins seem to be connected to i2c port 0 only on the Intel boards, not the AMD board I have. On the AMD 7040 schematic they are labeled as TS_SDA and TS_SCL with no indication of where they connect. I also measured the pins with an oscilloscope and they are both at 0v when the computer is on, indicating that whatever i2c port they are connected to is completely inactive.
A firmware update on my Intel board even installed HID-I2C devices on BUS 0 on my windows device pool even though there are no devices connected. So I would suggest that with an Intel Board with the latest firmware update, an I2C touchscreen would start right out of the box. I will test it some time in the future… now that I have found a spare cable to measure stuff without breaking my hands soldering mini-wires to micro-connectors.
That measuring cable you have, that with the dangling wires in your first post, is that capable of connecting eDP4? Maybe for a short length? Because the original wires are shielded wires and I am thinking of a way to assemble a custom cable for this…
The cable I used in the first post is this I-PEX cable that I cut in half. Each wire is individually shielded and was quite hard to solder to. It can carry the eDP signal fine as I used a second intact one for my tests with the full display but it does need an adapter PCB in order to connect to the display and that PCB can break out the i2c connections easily.
Does the USB port on the ipex seem to be connected? According to the AMD schematic, it should be available on the MB side, not sure about the cable (but that can be replaced with a 1:1 cable).
One option would be to use some kind of USB-to-I2C hid bridge such as FT260. One can even get a breakout module for testing and it also seems to be available for JLCPCB assembly. Could also make it PNP without messing with ACPI tables.
I did break out the USB port but I have not tested it yet. Using a USB to I2C bridge is a good idea. When I get some time I will test the USB port and, if it works, buy that USB to I2C adapter and see if i can get that to work with the touch screen.
It also might be possible to use the webcam ALS sensor I2C pins for the touchscreen but I have not had time to give it a try ether.
Hello, I am an electronics enthusiast from Taiwan. I would like to use the IIC USB HID solution, but lack some technical support. Do you have any latest progress?
I’m curious if there has been any updates on this project since? I would love to see an implentation of a 2 in 1 touchscreen FW13 tbh, I’ve been thinking about prototyping one myself.