Comments on: Arduino USB Host – USB Descriptors.

By: Patrick Delges

Patrick Delges — Wed, 26 Jan 2011 10:35:24 +0000

Thanks for your answer. You’re right about the hub!
Here is the device descriptor of Apple’s belgian kb without numeric keypad (well, of its hub):

Device descriptor:
Descriptor Length: 12
Descriptor type: 01
USB version: 0200
Device class: 09
Device Subclass: 00
Device Protocol: 00
Max.packet size: 40
Vendor ID: 05AC
Product ID: 1005
Revision ID: 9615
Mfg.string index: 01
Prod.string index: 02
Serial number index: 03
Number of conf.: 01

The keybard with numeric keypad has the same descriptor, but with a product ID of 1006.

Using Apple’s System Profiler, those are the descriptors of the keyboards plugged to their hubs:

with numeric keypad:

Product ID: 0×0221
Vendor ID: 0x05ac (Apple Inc.)
Version: 0.69
Speed: Up to 1.5 Mb/sec
Manufacturer: Apple, Inc
Location ID: 0xfd132000
Current Available (mA): 100
Current Required (mA): 20

Without numeric keypad:

Product ID: 0x021e
Vendor ID: 0x05ac (Apple Inc.)
Version: 0.70
Speed: Up to 1.5 Mb/sec
Manufacturer: Apple Inc.
Location ID: 0xfd131200
Current Available (mA): 100
Current Required (mA): 20

Best,

By: oleg

oleg — Fri, 21 Jan 2011 19:26:29 +0000

An Apple keyboard most likely has a hub in it so keyboard sketch won’t work with it. I’m working on the code with hub support, hoping to release it in a couple months. Post your device descriptor output here – I’ll take a look why config descriptor is not showing.

By: Patrick Delges

Patrick Delges — Fri, 21 Jan 2011 15:08:00 +0000

Hi Oleg,

just received your shield this morning but I have some small problems:

I plugged an Apple keyboard.

Your getdevdescr( 1 ) code runs fine (the first one on this page).
But the 3rd example – getconfdescr( 1, 0 ) – doesn’t display nothing besides “Start”. So I tried the conf_descr_dump.pde example, but then the arduino reboots continuously after getconfdescr() is called.

So I tried the keyboard polling example, which returns
Error attempting to configure boot protocol. Return code :5

Is there anything obvious I should check?

Thanks,

By: Jeremy

Jeremy — Thu, 23 Sep 2010 07:22:38 +0000

Hey Mike,

Unfortunately, I can’t help much with your question as I have a similar one. I am using a HUAWEI E160 with Oleg’s USB Host shield. I’ve had success communicating with the modem (sending/receiving SMS) via a python script when attached to my computer via USB, but getting the arduino talking to the modem via AT Commands has proved difficult so far (though I’m completely new to this technology so that doesn’t mean much).

Let me know if you have any success looking into feasibility and I will do the same.

Cheers,
Jeremy

By: oleg

oleg — Mon, 20 Sep 2010 19:18:28 +0000

Hi Mike,

From what I learned so far, GPRS is not that difficult to implement. The biggest issue would be getting programming documentation for your module or reverse engineer control commands if unable to get docs.

I have USB GPRS code on my todo list also, don’t know when I’ll be able to start, though.

Good luck with your project!

Regards,
Oleg.

By: Mike

Mike — Mon, 20 Sep 2010 18:19:18 +0000

Hi Oleg,

I’ve built an arduino project that uses a GPRS shield to send SMS’s. I now need to make a dozen similar modules and am trying to save money. Each GPRS shield costs about $100 or more, but I can get a USB GPRS dongle for less than $10. I’d like to use a arduino USB host shield to connect the arduino straight to the dongle. Before I invest too much time and energy into this, can you give me some idea if what I’m trying to is feasable, and if so how difficult would it be? The USB GPRS dongle I’m using is a HUAWEI E1750, I only need very basic functionality, just enough to send SMS’s only.

Thanks for your help

Mike