Hi Stuart, That error seems to originate from libftdi, suggesting that libusb_open failed ( http://developer.intra2net.com/git/?p=libftdi;a=blob;f=src/ftdi.c;hb=HEAD#l407). If so it cannot be fixed on sigrok's side since it relies on the underlying drivers to communicate with the devices. Can you list the output of: sudo lsusb -v -d0x0403 (or whatever your device id is)
Another test of the libftdi/libusb stack is to run e.g. the ftdi_eeprom utility (http://manpages.ubuntu.com/manpages/impish/man1/ftdi_eeprom.1.html), just to see if that driver stack can access the device. Best regards On Mon, May 31, 2021 at 4:49 PM stuart <stu...@xnet.com> wrote: > Hi, > > I know this is the dev mail list. If there is a user mail list please > let me know. (I've dropped in on the IRC twice and asked but I didn't > see any responses.) > > On an up to date Ubuntu box, if I can run: > > "minicom -D /dev/ttyUSB0 -b 9600" > > ... and get the voltage from my FLUKE 45 then why doesn't: > > "sigrok-cli --driver fluke-45:conn=/dev/ttyUSB0:serialcomm=9600/8n1 > --continuous" > > ... return anything at all? > > -thanks for any help. > > More info in case it is useful: > > > ./sigrok-cli --version > > sigrok-cli 0.8.0-git-dded02f > > > > Libraries and features: > > - libsigrok 0.6.0-git-955ab604/4:0:0 (rt: 0.6.0-git-955ab604/4:0:0). > > - Libs: > > - glib 2.64.6 (rt: 2.64.6/6406:6) > > - libzip 1.5.1 > > - libserialport 0.1.1/1:0:1 (rt: 0.1.1/1:0:1) > > - libusb-1.0 1.0.23.11397 API 0x01000107 > > - libftdi 1.4 > > - librevisa 0.0.20130812 > > - Host: x86_64-pc-linux-gnu, little-endian. > > - SCPI backends: TCP, RPC, serial, VISA, USBTMC. > > > > ./sigrok-cli --scan > > sr: ftdi-la: Failed to get the FTDI strings: -4 > > sr: serial-libsp: Attempt to open serial port with invalid parameters. > > sr: serial-libsp: Attempt to open serial port with invalid parameters. > > sr: serial-libsp: Attempt to open serial port with invalid parameters. > > sr: serial-libsp: Attempt to open serial port with invalid parameters. > > The following devices were found: > > demo - Demo device with 13 channels: D0 D1 D2 D3 D4 D5 D6 D7 A0 A1 A2 A3 > A4 > > > > minicom -D /dev/ttyUSB0 -b 9600 > > Welcome to minicom 2.7.1 > > > > OPTIONS: I18n > > Compiled on Dec 23 2019, 02:06:26. > > Port /dev/ttyUSB0, 09:45:07 > > > > Press CTRL-A Z for help on special keys > > > > VAL? > > -0.28E-3 > > => > > > > > _______________________________________________ > sigrok-devel mailing list > sigrok-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sigrok-devel >
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