[SOLVED] STM32L072 reset when attaching to running program

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  • [SOLVED] STM32L072 reset when attaching to running program

    With STM32L0xx devices the "Attach to running program" procedure causes an unwanted reset of the device:

    Debug.SetConnectMode (CM_ATTACH);
    Exec.Connect();
    Device "STM32L072CZ" selected.
    Found SW-DP with ID 0x0BC11477
    Found SW-DP with ID 0x0BC11477
    Scanning AP map to find all available APs
    AP[1]: Stopped AP scan as end of AP map has been reached
    AP[0]: AHB-AP (IDR: 0x04770031)
    Iterating through AP map to find AHB-AP to use
    AP[0]: Core found
    AP[0]: AHB-AP ROM base: 0xF0000000
    CPUID register: 0x410CC601. Implementer code: 0x41 (ARM)
    Found Cortex-M0 r0p1, Little endian.
    FPUnit: 4 code (BP) slots and 0 literal slots
    CoreSight components:
    ROMTbl[0] @ F0000000
    ROMTbl[0][0]: E00FF000, CID: B105100D, PID: 000BB4C0 ROM Table
    ROMTbl[1] @ E00FF000
    ROMTbl[1][0]: E000E000, CID: B105E00D, PID: 000BB008 SCS
    ROMTbl[1][1]: E0001000, CID: B105E00D, PID: 000BB00A DWT
    ROMTbl[1][2]: E0002000, CID: B105E00D, PID: 000BB00B FPB
    Reset: Halt core after reset via DEMCR.VC_CORERESET.
    Reset: Reset device via AIRCR.SYSRESETREQ.

    With STM32F2xx devices the "Attach to running program" procedure works fine without any reset being generated.

    Of course, for the Murphy's law, I need to "Attach" to a STM32L0xx device and I am NOT interested in STM32F2xx devices ?(

    Any suggestion will be highly appreciated,
    PaoloC
  • Hello Paolo,

    Thank you for your inquiry.
    The reported issue was reproducible.
    We are currently working on a fixed J-Link software version.
    Until then you can use the following workaround:
    - Create a JLinkScript with function ConfigTargetSettings()
    - Execute exec command SetSkipInitECCRAMOnConnect and set it to 1
    - load JLinkScript in your Ozone project e.g. in hook function BeforeTargetConnect

    More information about JLinkScript and the Ozone project file can be found in the J-Link user guide and Ozone manual respectively.

    Best regards,
    Nino
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