IEEE1284/USB
in [Win32 Kernel]
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From: Giuseppe on 26 Oct 2009 05:23 I have a peripheral connected to a converter IEEE1284/USB (Prolific pl2305). To increase the speed of data transfer I need to change the setup of the pl2305 chip. I tried to send UsbBuildGetDescriptorRequest (.. USB_CONFIGURATION_DESCRIPTOR_TYPE, ...) but I do not know how to find the PDEVICE_OBJECT to send the request. Tanks.
From: Tim Roberts on 28 Oct 2009 03:14 "Giuseppe" <info(a)electrostudio.it> wrote: > >I have a peripheral connected to a converter IEEE1284/USB (Prolific pl2305). >To increase the speed of data transfer I need to change the setup of the >pl2305 chip. I tried to send UsbBuildGetDescriptorRequest (.. >USB_CONFIGURATION_DESCRIPTOR_TYPE, ...) but I do not know how to find the >PDEVICE_OBJECT to send the request. What is it that you hope to change? You can't change the descriptors in the device. It's a USB 1.1 device, which means it's inherently limited in its data rate. You could conceivably write a lower filter driver to tuck underneath their driver, and send URBs that way, but I'm dubious that you will be able to change anything. -- Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc.
From: Giuseppe on 29 Oct 2009 05:56 The converter uses the IEEE1284/USB Prolific pl2305 chip. From the data-sheet that has an interface with three alternative settings. I wanted to try to force Interface 0, Alternate Setting 2 (I0: A2) to see if the communication speed in reverse increases. The converter is operated by the driver usbprint.sys. I have not found information how to change the mode of communication through the standard driver. By defaul the mode of communication in reverse is nibble, my device supports BYTE and ECP. Otherwise I am forced to rewrite the driver to replace usbprint.sys, which is too expensive and long. Tanks. "Tim Roberts" <timr(a)probo.com> ha scritto nel messaggio news:egrfe59u9a4m3kp9nva8l6ip4he64a666u(a)4ax.com... > "Giuseppe" <info(a)electrostudio.it> wrote: >> >>I have a peripheral connected to a converter IEEE1284/USB (Prolific >>pl2305). >>To increase the speed of data transfer I need to change the setup of the >>pl2305 chip. I tried to send UsbBuildGetDescriptorRequest (.. >>USB_CONFIGURATION_DESCRIPTOR_TYPE, ...) but I do not know how to find the >>PDEVICE_OBJECT to send the request. > > What is it that you hope to change? You can't change the descriptors in > the device. It's a USB 1.1 device, which means it's inherently limited in > its data rate. > > You could conceivably write a lower filter driver to tuck underneath their > driver, and send URBs that way, but I'm dubious that you will be able to > change anything. > -- > Tim Roberts, timr(a)probo.com > Providenza & Boekelheide, Inc.
From: Tim Roberts on 30 Oct 2009 23:05
"Giuseppe" <info(a)electrostudio.it> wrote: > >The converter uses the IEEE1284/USB Prolific pl2305 chip. From the >data-sheet that has an interface with three alternative settings. I wanted >to try to force Interface 0, Alternate Setting 2 (I0: A2) to see if the >communication speed in reverse increases. Alterate setting 2 just adds an interrupt IN pipe. That's an extension to the USB Printer Class, so usbprint.sys will not know about it. >The converter is operated by the driver usbprint.sys. Your basic problem is that usbprint.sys does not support bidirectional modes. Back transfer is done through the control lines. End of story. >Otherwise I am forced to rewrite the driver to replace usbprint.sys, which >is too expensive and long. Maybe. USB Printer Class is a very simple specification. The whole spec is only 17 pages, including titles and tables of contents. You could drive this device with WinUSB without even breaking a sweat. -- Tim Roberts, timr(a)probo.com Providenza & Boekelheide, Inc. |