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    • GDB with no symbol table and OpenOCD fails libusb_open()

    Posted by rnunes on 2016-06-03 16:01

    I'm using a Nucleo F446RE board and I'm using System Workbench 1.9.0 to debug in it.

    I have CN4 jumpers ON (to enable on board MCU debug), PWR jumper on 2-3 (powered by SWD VBUS) and I connect to it using ST-Link Utility. I already upgraded ST-Link firmware and computer drivers.

    I have a C++ project (mixed with C) that uses two static libraries and everything is built and linked with success. When I try to debug it (right click on the project -> Debug as -> Ac6 STM C/C++) I get this from GDB:

    "No symbol table is loaded. Use the "file" command.
    Function "main" not defined."

    I have -O0 and -g3 flags for every C/C++ compiler flags and -g for assembler as well.

    Another problem is that OpenOCD can't open USB device:

    "adapter speed: 2000 kHz
    adapter_nsrst_delay: 100
    srst_only separate srst_nogate srst_open_drain connect_assert_srst
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz
    Info : Unable to match requested speed 2000 kHz, using 1800 kHz
    Info : clock speed 1800 kHz
    Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED
    Info : STLINK v2 JTAG v27 API v2 SWIM v15 VID 0x0483 PID 0x374B
    Info : using stlink api v2
    Info : Target voltage: 3.269266"

    First of all, this is supposed to be using SWD and ST-Link v2-1, and it looks like it's using V2 with JTAG (??). I've followed the .cfg files used for this project(nucleo_f446re.cfg)and everything looks fine.

    Are these problems related?

    Reads: 21605
    Posted by JimBob on 2016-06-03 17:30

    >Another problem is that OpenOCD can't open USB device:

    Assuming you are using Linux: Permission problem?

    To check you could start OOCD with root permissions, but then you should set an appropriate udev rule.

    >Are these problems related?

    Not in any way.

         Posted by rnunes on 2016-06-03 17:40

    JimBob, I'm using Windows 8.1 (which I read everywhere that it's basically a mess with LibUSB devices).

    I think I've already solved my second problem, I didn't have my startup folder (maybe I deleted it by accident). Right now I don't have the missing function error but then again, OpenOCD can't open the device.


         Posted by diabolo38 on 2016-06-09 23:27

    is stlink utility able to connect ? if yes disconect or close
    is it some usb 3.0 port ? if yes try to plug on different port preferably usb 2.0 ,


         Posted by rnunes on 2016-06-10 15:16

    It's a USB 3.0 port, but now it works fine. It still gives the same LIBUSB_ERORR but the OpenOCD provided by AC6 works great.

    I first tried to change drivers using a tool but it didn't worked (at least the application was constantly giving an error).