I have a GSM LTE evaluation board which contains a USB slave device port and a evaluation board for microcontroller which also contains USB slave device.
I want to send commands to GSM module using the controller boards through USB.
After browsing couple of hours on internet i didn't find anything helpful.
My question is that is there any possible way to communicate two USB slave device??
Any help is appreciated...
Thank you in advance
Two USB devices cannot communicate directly one to another. Unless they support OTG. In most cases it is needed USB host controller between those two USB devices to provide some kind of link between them.
Related
this is a more HW question. I was wondering, is someone aware of a device which enables to connect a USB device to a PC over WiFi?
The idea is to plug USB device into a transmitter and have a receiver at the PC side. The data would be transferred wirelessy.
I have learned that the key word for this type of devices is WUSB. However, I am failing to find a successfully stories behind using some of these, as well as a good device.
Does someone have an experience?
Thank you in advance.
I haven't seen any USB hubs that can transmit over Wi-Fi. But there are several Wireless Hubs available. Like these
http://www.ebay.com/itm/like/131933064085?lpid=82&chn=ps&ul_noapp=true
https://jet.com/product/detail/49089829a0c7458d9d30c1ec308febef?jcmp=pla:ggl:gen_electronics_a1:networking_bridges_routers_wireless_access_points_a1_other:na:PLA_348772140_24231289500_pla-177033586620:na:na:na:2&code=PLA15&ds_c=gen_electronics_a1&ds_cid=&ds_ag=networking_bridges_routers_wireless_access_points_a1_other&product_id=49089829a0c7458d9d30c1ec308febef&product_partition_id=177033586620&gclid=CJTyuaXNjM8CFYQkgQodOLAIkA&gclsrc=aw.ds
They have an adapter you plug into the PC and the hub works just like it would if it were wired.
Why do you need it to transmit over Wi-Fi specifically?
Hopefully I will have more luck today. I have no prior USB integration and about 8 months of learning embedded systems on Atmel devices. I am trying to use an Atmel SAM L series to connect over USB to a computer. The use case is for data transfer. Specifically, the MCU will be gathering data from it's sensors and packaging it for USB transfer.
I have searched through and read up on all of Atmel's included USB examples. I have also started reading through usb.org's class specifications for CDC.
I have running now something that lets me send data along one com port, into the target usb and then out the debugger usb to another com port. However, I don't think this is real USB.
My problem is two fold.
1.) I do not fully understand what differentiates USB from serial communication on a com port.
2.) Even if I were doing it correctly, I'm not sure how to test and verify that I have indeed created a legitimate USB device that can be accepted by a host computer.
Links to documentation(Atmel or generic) or example code would be appreciated.
1) USB is defined in the USB specifications from http://www.usb.org. Serial ports were an older and simpler interface that involved sending data back and forth asynchonously on pins with names like TX and RX. The USB CDC class and its ACM subclass allow you to make a USB device that emulates a serial port. If you make your device be a USB CDC ACM device, then you don't need to supply any drivers for Windows 10, Linux, or Mac OS X.
2) You can read the USB specification and the CDC ACM specification. You can run the USB command verifier. You can test your device with a variety of different USB hosts to make sure it works.
Just as the question states, the goal is to reverse engineer the protocol used by a device.
Let's say you have a webcam, an Arduino and an Arduino USB Host shield. You want to talk to that webcam, from which you don't know the protocol. Can it be done by monitoring USB data packets and by analyzing the driver installed for that device?
It would be a really interesting project.
Thanks in advance.
I often use a serial spy program to look at the conversation between two devices. In windows you can pay for it...
http://www.sinnovations.com/htdocs/serial-port-monitor.htm
In Linux it's free...
http://www.cyberciti.biz/faq/howto-monitor-data-on-a-serial-port-in-linux/
I'm looking to control a bunch of LEDs from my computer, with a TI MSP430 or similar.
My computer is a Macbook Air, and so it looks like the only port I can communicate with is USB. The MSP430 has a USB port, but I can't find any information about using the USB port for anything besides programming the chip. Is there a way around this, to use USB to communicate with the board?
Thanks!
If you are using one of the processors with built in USB hardware then you should look at this Texas Instruments Page which describes the capabilities of the MSP USB. It includes links to the USB software stack that you will need to implement an HID class device.
I see two more options here. You can also use:
a) USB <-> LPT adapter to control the LEDs directly — in this case the schematics are extremely simple. See how it's done;
b) USB <-> COM or USB <-> RS232 adapter to communicate with the controller via RS232 — in this case you'll have to implement some simple protocol for communication with the controller, but the whole solution would still be much simpler than the one with USB.
The MSP430 Series 5 and Series 6 micro controllers (i.e. MSP430x6xx and MSP430x5xx) have built in USB modules that allow communication from PC and could be used to control the MSP430 via USB. Download the MSP430 USB Developers package here: http://www.ti.com/tool/msp430usbdevpack and use the USB CDC or HID API stacks to develop an application as per your requirements. In case you are using CDC(COM port) you may use a Terminal program to send the commands to control LEDs or if you use the HID stack, you may use the hidDemo PC software included in the Developers package to send/receive commands.
my problem is to connect two identical devices with OTG-capable USB interfaces. Is this a simple giveaway or do I have to start and stop host- and device-mode manually with an arbitrary timing pattern so that eventually one is hit in device mode when the other one is an OTG host? From skimming over the APIs of several USB-stack producers it is unclear to me if symmetrical connections are possible at all.
regards,
slarti
PS: the device is an AVR32
The official cable has a "jumper" in the A end that tells the device it is plugged into to be the host. The OTG Supplement also includes a Host Negotiation Protocol which allows the two dual-role devices to interchange roles.