Just curious if anybody has thought of or thinks it would be possible to get the linux usb monitor drivers compiled into the kernel and attach a usb monitor since we have a free usb port.
I don't know how current this is, but a quick search brings up this as (at some point) home to the open source usb display drivers..
http://libdlo.freedesktop.org/wiki/
Though for all I know, current kernel sources may have this already all integrated and just need to be flipped on in the config for the kernel compilation. If anybody has a usb monitor I'd be curious to hear your results, if this works I might buy one and make my own "dock" from a usb hub for mouse/keyboard/display
I don't know enough about androids display technology, do you think even if the kernel recognized and supported the device that android could be coerced through configuration to display on it?
Related
I'd like to connect to android powered tablet several peripherals (through micro usb I guess) like: couple of rs-232 ports, keyboard and even one rj12 port.. as I guess it's possible to create usb-hub-device to all this functions, and develop drivers for it.. I just never dealt with stuff like this before. What of it is possible and mb android have built-in support of some interfaces and devices..? goal is to make cheapest solid touch tablet based complete device.
For this to work, your Phone needs special USB-OTG-capable hardware. I doubt it has. If you don't know what it is and why it is definitely needed, google for USB OTG (on-the-go).
Of course, a simple USB host connector would do as well, but no phone has one (but some tablets do).
No android phone out now has USB host support, nor the drivers to run any peripherals.
thx for answrs, looks like its possible but I need to port usbhost module to device kernel.. and perpherals drivers modules too.
hey guys came across an interesting discussion! i cant post in dev boards yet... however, this guy provides some answers, maybe some of the elders may want to take a look. EDIT: i cant even post an outside link read code box i guess...
Code:
Hi All,
I've spent some time today dithering on the Nexus S and host mode and I think the way to approach this is different from the Nexus 1 host driver hack.
The Nexus S uses a Fairchild USB switch (fsa8480) to detect device connections. I believe the point is to allow the device to handle multiple functions like charging, UART and USB access simultaneously.
The Switch will detect OTG connections. Plugging in a microB to A convertor with pin 4 grounded to 5 causes the fas9480 driver to wake up and report an OTG attachment. It also calls into the S3C_UDC_OTG driver to configure it up and create a vbus session. (start charging)
The problem is that in the Nexus S kernel, this driver is device mode only. There is no code to put it into Host mode and the chip can only be in Host or device mode. It can't do both at the same time. Also, the few people that have tried to use host drivers have found that they must disable the device code (including charging capability) to get the hubs to enumerate.
It appears that the OTG core in the samsung part is from DesignWare. There are synopsis reference drivers up here:
*************check edit reason for driver link*****************
The register map appears the same, and the code supports host and device mode as well as dynamic switching based on HNP negotiation.
It seems like the best way to approach this would be to integrate this code and use the fsa9480 discovery as the hook to force host mode (when OTG is detected) or device mode when other devices are detected.
The demo we were under the gun to support will probably just use Nexus one, however I thought the rest of you guys would want to see this. I think if done right, you could have host mode, gadget mode and charging all in the same kernel.
Steve
--
Steve Modica
CTO - Small Tree Communications
---not my words, or even me. just though people may want to know!
Sorry 4 the prev thread in wrong section .. then .. One S ( stock rom or another custom rom - with or without Sense ) supporta the usb-host mode ?
I am reasonably sure that out of the box, on stock ROM it does not support the ability to act as an USB host. Additionally, the microUSB on the phone is an USB slave socket, so it would need an adapter to connect a USB slave device to it anyways. (At least I have not yet seen a native USB-Host device with a microUSB socket.)
I am pretty certain it can be hacked into a custom ROM or application, however there are limitations to this. Commonly a device that is designed as USB slave (like the One S) will not be able to power devices through the USB port as regular USB hosts have to.
So IMO, in order to get it to work as an USB host you would need an adapter to connect the devices properly, a modified firmware or specialized app AND a way to externally power the USB slave you want to connect to the One S acting as USB host. The external power might a portable USB charger battery (like the Gumpack) or an Y-cable which is connected to a "real" USB-Host device just for the power (or a car/wall USB charger).
So, theoretically it would be possible, but not very practical. To the best of my knowledge it has not been done in the past because there was no need to. This however might actually change with the current trend towards non-expandable memory on newer phones... if demand rises I bet manufacturers would come up with solutions. Think small USB storage sticks with regular USB plug on one side for use on Notebook/Desktop and a microUSB plug on the other which contain a tiny battery (think Bluetooth headset size) to power the stick while attached to the phone and are charged while connected to a real USB Host port which is designed to deliver juice.
Further reading: http://en.wikipedia.org/wiki/Universal_Serial_Bus#Connector_types
04/11/2014 - 01:41AM - Central Time
USB OTG does work on the Motorola Atrix 2.
I post this because there are no defining topics listing all the requirements and caveats of making this work currently as of the date. Just alot of help topics to sift through. I got a little obsessive in my search to make this work so this is pretty much a knowledge dump.
Started from original help threads here on the forums (various many... lots), figured things out from there through conversations with Chainfire. Ultimitely fixed with lots of research and use of his USB Host Diagnostics App.
Requirements:
Motorola Atrix 2 Stock 4.0.4 - Rooted [stock kernel as well]
(what drove me insane on this was that in USB HOST Diagnostics App it showed kernel support, and API support up to Device detected)
USB OTG Y cable, usb 2.0 (I was concerned about this in the beginning however mine appears to be usb 2.0, got it off amazon.)
(Through research it concerned me that a usb 3.0 would not work. Have not tested this)
USB Drive, usb 2.0
- Tested with a Sandisk Cruzer Micro 1gb
(I assume others will work although there have been some help topics mentioning problems with certain usb drives)
[NOTE]
Must be formatted fat32 - I have noticed a few threads I researched mentioning exfat is not supported for certain devices
(have not confirmed as of post date if exfat is supported for Atrix 2 Stock)
[NEEDED] For USB Host AutoMount
Usb 2.0 Hub (I have an old one i cut apart originally. Dont remember the make, and I lost the housing for it, but hey it works)
---------------
USB Host Diagnostics App by Chainfire
(v1.3 as of post date)
Get it at Play Store [link]
Click to expand...
Click to collapse
Instructions (i.e. my exact process)
I came from testing a multitude of custom roms. None of them worked. I have a help thread on it here. Unconfirmed if any of them work at all I had no success. If you are wondering the post thread is here.
- Flash to stock ICS 4.0.4 (if you are not already)
- Root the Atrix 2
Not sure if the relevant (but this is the exact process I took)
-Install BMM
-Installed Busybox (1.22.1)
-Installed USB Host Diagnostics App
(get your host cable and usb drive ready)
-Ran the app
(Follow the instructions it will ask you at the end if you wish to attempt to fix the issue)
- Say yes to try to fix it.
- Follow instructions (go for a reboot)
- Open up usb diagnostics app.
- Run again to confirm
Congrats!
Click to expand...
Click to collapse
This will not make it automount.
- You do not need a separate program to do this.
Grab your USB hub, plug the USB Drive into the hub and plug it in. To my surprise it automounted.
Chainfire had mentioned checking out a certain file when I was trying to find custom roms that would work. The file was there but they did not work. I gather that file was added by his program and made it work on stock ICS 4.0.4.
There are alot of other threads for other devices. Samsung requires shorting the last 2 pins on the USB connection. This is not needed for Motorola, but keep this in mind if you are randomly searching for USB OTG answers.
---------------
Thanks: Chainfire
Couldn't have figured this out without his help. I highly recommend his apps, he definitely has a deep knowledge of the android system.
Hopefully that should clear things up a bit for anyone searching for the Atrix 2 USB OTG help. I'm moving on to hopefully port from ICS USB OTG host features to a custom rom like Cyanogen. Ill update a link if I come up with anything.
Hello, maybe someone can guide me for final results and find solution. My plans was watch Tv on lapdock 500pro, after i find dvb-t reciever for android. the model was ]CSL - mini DVB-T Stick (from amazon)
requriments of device informs that phone needs android 4.0 or high, dual core cpu (neon support) and usb otg
i have atrix2 mb865 with stock 4.0.4 +root and text inside /proc/cpuinfo returns - "Features: swp half thumb fatmult vfp edsp neon vfpv3"
last one what i need must be usb otg support, so after i get device i connect it direct to microusb and run installed Air Dtv app, it returns "Device not found" then i find this topic and install Busybox and USB Host Diagnostics and run app. I rush to make it quickly so when start diagnostics app asks me connect usb device but i have no any usb device and otg cable also. so i just plug charge cable in lapdock`s usb and connect it to phone, app little think then ask me to Fix usb otg support and after ask to reboot system. After reboot i try again connect directly that device but app again returns "Device not found" - then i check topic again and start to build otg cable.
After cable was complete i check it by connecting to external power (wall adaptor) then i have results.I run USB Host Diagnostics, start test connect device by otg cable, and app returns me (see pic)
Also, when i connect device by otg cable now system popup "By which programm you want use device" and give choice to Air Dtv or Idtv Mobile, 2 apps. But Air Dtv returns me "Device initialisation failed, unplug device and connect after few seconds" another app cant find device also. (see pic)
Also i install Usb Device info app, and able to see connected device info, system shows me that stick is connected to phone. (see pic)
Also i able to mount usb stick to phone by otg cable with external power, and can view files in it. Means i suggest that otg cable and otg in system works
My final point was view Tv on lapdock but at this step i cant run it on phone, Air Dtv also returns me "device not found" when i try to connect it to lapdock by microusb female - usb male extension (included in package of Tv stick)
Also that device works on pc, i install windows software and check it. Mean stick works and shows tv channels. can be for sure that device works
Hope for your help and support!
That solves my problem sort of, I'm going to try to install NUMA and see what results I get. Ill update my post once I'm done
Hello.
I have a machine with a USB host and a USB accessory port.
I have successfully got an Android tablet to talk to the machine, using an OTG cable which puts the tablet into Host Mode (using the machine accessory port).
This has a couple of problems, one of which is charging while in host mode.
I am now trying to keep the tablet in accessory mode, and connect to the host port on the machine.
My research suggests that Android has no support for running as the accessory.
The ADK sample code clearly seems to intended to run on a host (as it enumerates accessories).
I know the tablet supports an accessory mode because when I plug it into a PC, it mounts as camera or storage.
I can understand why they would not expect a keyboard or hub to be running Android, but there do seem to be some legitimate use cases.
Can anyone confirm my understanding, that there is no way to run Android as the accessory ?
Thanks.
I have since found the Android Open Accessory Protocol. Using information from ver 1 and 2 of the protocol, I found enough info to switch the android device into the special android-accessory mode. Note that on Linux, you may need to change the adb program so it is owned by root if you want to run the debugger over the new connection.