How to read and write data through USB

Printable View

Nov 25th, 2010, 02:46 AM
kiranp

How to read and write data through USB

Hi all ,

I have a PCM 2707 USB to I2S converter module.... This is connected to the USB port of the PC... The other part i.e I2S part is given to the transmitter board...

So now i need to know , how i can send data to that IC through USB port???

And at the receiver end (its a wireless module) , i need to tap out the Data line and connect it to the USB port...

So at the receiver end how can i display the data collected , onto my PC through USB.....

Please do help me out...

Thank you
:wave:
Nov 25th, 2010, 04:49 AM
Doogle

Re: How to read and write data through USB

What does Windows recognise the USB device as ?
Nov 25th, 2010, 04:52 AM
kiranp

Re: How to read and write data through USB

Quote:

Originally Posted by Doogle

What does Windows recognise the USB device as ?

Hi ,
it recognizes itself as a Human interface device (HID)...
Nov 25th, 2010, 06:01 AM
Doogle

Re: How to read and write data through USB

What is the module configured to do ? All the examples I can find are to do with Audio Output (eg USB Headphones / Speakers)
Nov 26th, 2010, 12:34 PM
DickGrier

Re: How to read and write data through USB

Are you sure this is the correct model number? The PCM 2707 USB is an Audio DAC with USB interface (it sould act like a sound card). I don't see anything that indicates that it provides a I2C interface. Internally, it has a SPI serial interface -- this is similar to I2C, but not the same thing, and I don't think it is designed to be used by the user.

There are other devices (http://www.robotshop.com/devantech-u...m_campaign=jos) for example, that provide a USB to 12C interface. In the case of the one that I've mentioned, you would use MSComm to send and receive data, because it employs a device driver that emulates a serial adapter.

Dick
Nov 29th, 2010, 02:06 AM
kiranp

Re: How to read and write data through USB

Quote:

Originally Posted by Doogle

What is the module configured to do ? All the examples I can find are to do with Audio Output (eg USB Headphones / Speakers)

Module is configured as the factory out , takes USB input and lets out I2S.
Nov 29th, 2010, 04:17 AM
westconn1

Re: How to read and write data through USB

you need some SDK or similar from the manufacturer
Nov 29th, 2010, 12:46 PM
dilettante

Re: How to read and write data through USB

I think the O.P. means I²S, not I²C.

I agree, the manufacturer's drivers and docs from an SDK would be the way to go.
Nov 29th, 2010, 01:02 PM
DickGrier

Re: How to read and write data through USB

Yeah, he did say I2S -- though this is about the same as I2C, with slight differences in protocol detail. However, since this is a HID device (and HID, normally, consists of mouse/keyboard IO, not sound card IO), it would seem that a vendor API is the way to go. I've seen other HID devices offer non-HID API's, though the ones that I've seen don't generally work under Windows Vista or Windows 7.

I suppose that one more suggestion might be to look in Control Panel to see if the USB adapter not only appears as a HID device, but also as a sound device. If so, then standard sound APIs might be used, such as PlaySound in winmm.dll. I'm sure that I've seen a wrapper for this dll, though I don't have a quick link.

Dick