Hi, I'm glad to see the pulseview GUI and sigrok are making steady progress, nice and useful software. For longer sampling times it would be nice to have a search/filterable tree/listview of the decoded packets/transactions, a field-value view for selected packet/transaction and also a hexview in addition to the horizontal time view.
I faced some reliability issues when using sigrok in combination with one of the popular Cypress FX2 based analysers, using the fx2lafw driver. Often it would not sample reliably above 1 MHz. - Detecting full-speed enumeration One source was a linux VIA PCIcard USB hostcontroller that exposed only its dual UHCI (USB 1.1) interfaces, the kernel ignored the EHCI (USB 2.0) device, thus enumerating all its USB devices at full-speed (12 mbps) instead of high-speed (480 mbps). The resulting 'slow' USB connection then cannot cope with the higher sampling frequencies - this is something which is not easy to spot in the GUI or OS. Libusb could tell me during device listing that it was enumerated at 12 mbps, but this information is not available anymore when actually opening the usb device. Maintaining this state in libsigrok is quite easy. Propagating of this debug clue could be done by sigrok and pulseview, all the way to the pulseview device connect dialog. - 24 MHz sampling reliability I found that the libusb callbacks are acknowledged with libsigrok hardware-specific api.c's libusb_handle_events_timeout(ctx, tv). When I changed this to libusb_handle_events_completed(ctx, 0) the sampling became more consistent and in line with the libusb documentation recommendation (preventing raceconditions) The latter is a libusb.org / libusbx.org / libusb.info library usage issue. I see the usb completion code is duplicated in a lot of places, perhaps this can be done using a libsigrok internal common api. Great work, thanks. Mark ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ sigrok-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/sigrok-devel
