Device Drivers

Work with internal GPS on HTC Kaiser without GPS Intermediate Driver
Hi all Im looking for a way to work with internal GPS receiver (Qualcomm) of HTC Kaiser device (AT&T Tilt). Normally, the GPS Intermediate Driver gets location from it when its GPS Hardware Port setting is set to 'No Port', so it is enough to connect to GPS ID Multiplexer COM port. But what I'm trying to ac... 30 May 2008 11:06

Why USB virtual COM driver IoCreateDevice 2 device objects ?
Hi I'am studying some USB Virtual COM driver source, I found AddDevice routine IoCreateDevice( ) 2 device object for driver use , DEVICEMAP export the first one and IoAttachDeviceToDeviceStack( ) the second one . What is the architecture that the driver use ? Can we create many device objects but only atta... 30 May 2008 09:32

Why can't the view of AMCap update ?
Hi I am making video capture driver for our PCI card. I am looking The strange behavior of AMCAP as below. A View of AMCAP is black only. But, when the other window ( like Explorer) was moved on AMCAP, the View of AMCAP updated. That is, the video data is transferred to AMCAP, however AMCAP did not update ... 3 Jun 2008 20:08

Spec design software ?
Hi Is there some good software to draw driver architecture, is VISO good enough? And do you know any great software can draw WDM or WDF IRP and ISR functions analysis of some project source ? Thank you. ... 31 May 2008 20:19

How to control device through MS provided drivers?
We have a USB CDCACM compilant mobile device and we want to reset the device programmically when there are some errors on the device. The device use usbser.sys provided by Microsoft as the device driver. I would like to know if there are any Device IO Control interfaces of usbser.sys which I can send ... 30 May 2008 09:32

USBD_STATUS_XACT_ERROR when plug/remove another device only on VISTA
I use bulk IN to transfer video data between cypress FX2LP 68013 and PC. Our solution works well itself. However, when I put/remove other device (e.g. a usb disk) suprisedly to/from the same host controller of the PC, an error may happen. Both in VISTA (with SP1) and XP (with SP2), we see a invalid bulk packet... 30 May 2008 09:32

Modifying DSF sample
Hi all, I am currently trying to simulate my USB device using DSF. As I am new to this framework I am trying to modify existing samples. I modified USBLOOPBACK sample but I am unable to generate DLL of it. My OS is XP and I just add my own code in sample loopback in src\Test\DSF\USB\SoftUSBLoopback. After this... 3 Jun 2008 20:08

Absolute Mouse Data Input
Does anyone know if there is documentation on how the Windows input subsystem interprets absolute mouse data? I am trying to make my HID touchpad send absolute cursor positioning data to the system. I have absolute X and Y reported in a mouse top-level collection. What I have found is that my coordinates do not g... 30 May 2008 22:52

ReadyDrive application pinning
Hi, does anybody know how ReadyDrive (sysmain) stores the information about applications to be pinned? I know MS provides tools to OEM to pin OEM applicationd in the ReadyDrive. I want to know if it is a registry entry and if yes where it is? Can I edit that registry entry to add my own applications? Thanks. ... 30 May 2008 15:49

UnPlug USB composite device problem in Windows 20000
Hi, I have a usb composite device and have developed several drivers for it. Our device and drivers work well in Windows XP. I can see loaded and unloaded modules in Kernel debugger command window correctly when I plug and unplug the device in windows XP/ Vista. But when I loaded the drivers in Windows 2000 system... 29 May 2008 16:25