2011/1/17 Sridev Nair <sksridevn...@gmail.com>: >>>Are you sure it is a control request, not a simple bulk transfer? > I tried it as bulk/interrupt transfer however there was no response from the > device. The vendor doc doesn't mention anything about the type of request. > This command happens to be the first command run by the demo application. >>>You need to know if you want to send hexadecimal data as ASCII characters >>> or bytes: > I checked from the USB monitor that the demo application sends it as > "020200013803" > I would like to summarize the whole situation again as there are some more > observations/developments and I might be able to rephrase it better now that > I have some light on USB spec & usb-serial port communication, > When I run the initial code (detailed in the first post) I am able to make > the device (a controller) execute the command since I see the response to > the command in the window of demo application provided by the vendor and, > further, the LED on the device glows indicating that it received the > command. However, I am not able to capture the same response on my program > through dev.read() command. > Secondly, perhaps more significantly, when I close the port through the demo > application (or close the demo app itself) neither the dev.write() nor > dev.read() works. > Now, earlier we believed that there might be some specific vendor command > which might be opening & setting the config such as baudrate, etc. However, > I have reliably learnt from vendor docs & vendor tech support that there > isn't any such specific config commands and that any read/write on port > should either respond with proper info/data or error code from the device. > I understand that managed_open() opens the port implicitly and passes the > I got a bit confused now, are you using PyUSB 0.4 or 1.0? (or 0.4 API emulation over 1.0)
-- Best Regards, Wander Lairson Costa LCoN - Laboratório de Computação Natural - Natural Computing Laboratory (http://www.mackenzie.com.br/lcon.html) Programa de Pós-Graduação em Engenharia Elétrica (PPGEE) Faculdade de Computação e Informática (FCI) Universidade Presbiteriana Mackenzie - SP - Brazil ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ pyusb-users mailing list pyusb-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pyusb-users
