my requirement is to develope a USB CDC/ACM Virtual com port driver.
this driver will act as a translator i,e it receives the serial port requests from
above and sends down the URB’s below,the drivers below are all USB drivers.
now to be specific i want to connect my mobile phone throgh the USB cable to the host
and communicate from host to my mobile using virtual com port.(communication is throgh ATD commands)
but i am not sure what will be the role of usbser.sys(provided by microsoft)
and the driver which i will have to write will communicate with each other and the device.
Please if anybody can explain?
umer haris wrote:
but i am not sure what will be the role of usbser.sys(provided by
microsoft) and the driver which i will have to write will communicate
with each other and the device.
If your device implements CDC ACM, you don’t need to write a driver at all. Just write an INF that references usbser.sys and your device’s VID and PID and that’s all you’ll need.
can anybody please tell me whats the difference between serial over usb and CDC/ACM virtual com port driver?
-----Original Message-----
From: xxxxx@lists.osr.com [mailto:xxxxx@lists.osr.com] On Behalf Of xxxxx@gmail.com
Sent: Friday, November 02, 2012 6:53 PM
To: Windows System Software Devs Interest List
Subject: RE:[ntdev] USB CDC/ACM Virtual com port driver
umer haris wrote:
but i am not sure what will be the role of usbser.sys(provided by
microsoft) and the driver which i will have to write will communicate
with each other and the device.
If your device implements CDC ACM, you don’t need to write a driver at all. Just write an INF that references usbser.sys and your device’s VID and PID and that’s all you’ll need.
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Umer Haris Shaikh wrote:
can anybody please tell me whats the difference between serial over usb and CDC/ACM virtual com port driver?
Terminology. “Serial over USB” is a generic term that doesn’t really
mean anything. You can’t go find a spec for “serial over USB”.
“USB CDC ACM” is the name of the specification that describes how do to
serial port and modem emulation in a USB device – Communication Device
Class, Abstract Control Model.
I recall reading on this list that the standard Microsoft usbser.sys
driver is not sufficient for building USB serial port devices, but I
have no direct experience with that. FTDI supplies their own drivers
for their USB RS-232 devices, and there is a commercial product that
will do it (http://www.thesycon.de/eng/usb_cdcacm.shtml).
–
Tim Roberts, xxxxx@probo.com
Providenza & Boekelheide, Inc.