B4A Library Usb Host library

agraham · Sep 4, 2011

Here's an example that displays all the details of the first USB device it finds connected.

There is presently a bug in UsbDeviceConnection.getRawDescriptors so the Reflection library is used in USBdetails.DeviceDetails(device) instead.

It's quite interesting connecting various USB devices to see what they support.

Erel · Sep 12, 2011

V0.92 uploaded to the first post. This version adds a method named BulkTransfer which supports synchronous requests.

Erel · Sep 18, 2011

V0.93 uploaded to the first post. This version adds support for Android Accessory USB devices.
A big thank you for agraham for this implementation :icon_clap:

msemih2011 · Sep 24, 2011

Why get the following error when compiling program USBDetails

Compiling code. Error
Error parsing program.
Error description: The index was outside the bounds of the array.

agraham · Sep 24, 2011

I've just downloaded it to check and it compiles and runs fine for me.

msemih2011 · Sep 24, 2011

No change in the project using the Android version is 3.1 which gives the same result, but did not do it if you tell me that you are using them, I use libs

agraham · Sep 24, 2011

Sorry, but I don't understand your post.

msemih2011 · Sep 24, 2011

gives the same error when I try to compile the project. I used an android version 3.1. What does such an error?

agraham · Sep 24, 2011

I'm afraid that I have no idea. I am compiling using the android.jar for android-13 (Android 3.2).

Erel · Sep 24, 2011

This is probably related to the same error discussed here: http://www.b4x.com/forum/basic4android-updates-questions/11549-listview-eror-2.html#post64571

lgbdt · Aug 28, 2012

I'm just getting started with B4A and I've attempted both the USBDetails example and the USB example on my Coby MID8042 and have not had any luck with either application returning a USB device from manager.GetDevices. No matter what USB device I attach, devices[] is empty.

My Coby 8042 has Android 4.0.3 and it appears that USB devices are supported because I can plug in a USB mouse or USB keyboard via the USB Host dongle (provided by Coby) and they seem to work fine in various applications on the tablet. They just don't show up in the example apps...

I found a couple of topics via Google that suggested some tablets support USB devices and USB Host but don't support the USB Host API. Those topics went on to mention that a possible cause is the absence of an 'android.hardware.usb.host.xml file in the /system/etc/permissions folder. And, the absence of '<feature name="android.hardware.usb.host">' in either the handheld_core_hardware.xml or tablet_core_hardware.xml file. In looking in my 8042's /etc/permissions folder, these items do appear to be absent, as suggested.

Have you or any other users encountered this type of problem with the USB Host API on some devices?

Do you think those missing items mentioned could be the problem? If not, do you have other suggestions?

Thanks!

Erel · Aug 28, 2012

If your device is rooted then it is worth trying to add these missing items.

lgbdt · Aug 28, 2012

No. It's not rooted. I'm just getting started with android devices and I have not rooted anything yet. So, I'll do some more research on doing that and give it a try.

Thanks!

Deleted member 103 · Aug 30, 2012

Hi Erel,

I have 3 different USB-converter but not recognized by my device, I get the message "No device attached".

I try just using the example "USBdetail" and "USBpl203".
All USB converter have the chipset "Prolific PL-2303".

My device is an HTC-one-s ICS 4.0.3.

Ciao,
Filippo

Erel · Aug 31, 2012

The USB library is a simple wrapper over the native USB api. If it doesn't find the USB device then it means that your phone doesn't recognize it.

Deleted member 103 · Aug 31, 2012

That is but even if it would work with my phone not sure it would work with other mobile also.

It would be a better Seriel-Bluetooth adapter or what do you think?

Erel · Sep 2, 2012

If you do not target a specific device that you know for sure that it works with then a Bluetooth solution will be better.

NeoTechni · Mar 19, 2013

How would you get other data types?

Like INTs from a PS3 controller? Or even a mouse?

I've combined the USB and USB details examples into a single project and altered it to connect to a PS3 controller, but I can't get any data (other than all zeroes) from it

The relevant code is PrintRaf

Erel · Mar 19, 2013

Are you familiar with the PS3 controller protocol? The example code is specific to ADB protocol.

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