Posts by AndyCaron

  • [CLOSED] J-Link connection problem - STM32

    Hello,


    I am an engineering student and I’m working on STM32F407ZG.

    I use IAR and J-Link Lite STM32.

    The basic examples (without RTOS) worked fine until I try other examples (with
    FreeRTOS).

    Now I can’t download files on the board and an error message “Failed to get CPU
    status after 4 retries” is displayed on the screen. The basic examples don’t
    work too.

    I tried to use another board and JLink recognized the Cortex-M4 processor
    whereas the other was unrecognized. ("No device found at all")

    I tried to activate the bootloader (pulling BOOTMODE0 low and applying a reset)
    but it didn’t work.

    After that I tried to use J-Link unlock STM32 but I got another error message.

    Thanks for your help,

    Best regards,

    Andy


    SEGGER J-Link Unlock tool for STM32 devices
    Compiled Jul 10 2015 18:29:09
    (c) 2009-2015 SEGGER Microcontroller GmbH & Co. KG, http://www.segger.com
    Solutions for real time microcontroller applications
    Options:
    [0] Exit
    [1] STM32F0xxxx
    [2] STM32F1xxxx
    [3] STM32F2xxxx
    [4] STM32F3xxxx
    [5] STM32F4xxxx
    [6] STM32L1xxxx
    Please select the correct device family: 5
    Connecting to J-Link via USB...O.K.
    Using SWD as target interface.
    Target interface speed: 1000 kHz.
    VTarget = 3.274V
    Reset target...O.K.
    Reset option bytes (may take app. 20 seconds)...Resetting option bytes failed.
    Press any key to exit.