[SOLVED] Debug Tickless FreeRTOS with WFI

This site uses cookies. By continuing to browse this site, you are agreeing to our Cookie Policy.

  • [SOLVED] Debug Tickless FreeRTOS with WFI

    Hi,

    I'm trying to debug FreeRTOS with the tickless feature enabled (i.e. uses WFI) on a iMX RT1050 CPU.
    If the CPU is executing the WFI instruction J-Link fails to connect with the following error:

    "ERROR: Could not find core in Coresight setup"
    "Could not connect to target"

    There is no problem outside of WFI. The full log follows below.

    My question is: how can I flash and debug a software that uses the WFI instruction?

    Thanks
    Petr

    Source Code

    1. Could not connect to target.
    2. SEGGER J-Link GDB Server V6.34b Command Line Version
    3. JLinkARM.dll V6.34b (DLL compiled Aug 13 2018 16:38:47)
    4. Command line: -nosilent -swoport 2332 -select USB=50121431 -telnetport
    5. 2333 -singlerun -endian little -ir -speed auto -port 2331 -vd -device
    6. MIMXRT1051xxxxB -if SWD -halt -reportuseraction
    7. -----GDB Server start settings-----
    8. GDBInit file: none
    9. GDB Server Listening port: 2331
    10. SWO raw output listening port: 2332
    11. Terminal I/O port: 2333
    12. Accept remote connection: yes
    13. Generate logfile: off
    14. Verify download: on
    15. Init regs on start: on
    16. Silent mode: off
    17. Single run mode: on
    18. Target connection timeout: 0 ms
    19. ------J-Link related settings------
    20. J-Link Host interface: USB
    21. J-Link script: none
    22. J-Link settings file: none
    23. ------Target related settings------
    24. Target device: MIMXRT1051xxxxB
    25. Target interface: SWD
    26. Target interface speed: auto
    27. Target endian: little
    28. Connecting to J-Link...
    29. J-Link is connected.
    30. Device "MIMXRT1051XXXXB" selected.
    31. Firmware: J-Link V10 compiled Jul 23 2018 09:53:14
    32. Hardware: V10.10
    33. S/N: 50121431
    34. Feature(s): GDB
    35. Checking target voltage...
    36. Target voltage: 3.24 V
    37. Listening on TCP/IP port 2331
    38. Connecting to target...Found SW-DP with ID 0x0BD11477
    39. Scanning AP map to find all available APs
    40. AP[1]: Stopped AP scan as end of AP map has been reached
    41. AP[0]: AHB-AP (IDR: 0x04770041)
    42. Iterating through AP map to find AHB-AP to use
    43. AP[0]: Skipped. Invalid implementer code read from CPUIDVal[31:24] = 0x00
    44. Found SW-DP with ID 0x0BD11477
    45. Scanning AP map to find all available APs
    46. AP[1]: Stopped AP scan as end of AP map has been reached
    47. AP[0]: AHB-AP (IDR: 0x04770041)
    48. Iterating through AP map to find AHB-AP to use
    49. AP[0]: Core found
    50. AP[0]: AHB-AP ROM base: 0xE00FD000
    51. CPUID register: 0x411FC271. Implementer code: 0x41 (ARM)
    52. Found Cortex-M7 r1p1, Little endian.
    53. FPUnit: 8 code (BP) slots and 0 literal slots
    54. CoreSight components:
    55. ROMTbl[0] @ E00FD000
    56. ROMTbl[0][0]: E00FE000, CID: B105100D, PID: 000BB4C8 ROM Table
    57. ROMTbl[1] @ E00FE000
    58. ROMTbl[1][0]: E00FF000, CID: B105100D, PID: 000BB4C7 ROM Table
    59. ROMTbl[2] @ E00FF000
    60. ROMTbl[2][0]: E000E000, CID: B105E00D, PID: 000BB00C SCS-M7
    61. ROMTbl[2][1]: E0001000, CID: B105E00D, PID: 000BB002 DWT
    62. ROMTbl[2][2]: E0002000, CID: B105E00D, PID: 000BB00E FPB-M7
    63. ROMTbl[2][3]: E0000000, CID: B105E00D, PID: 000BB001 ITM
    64. ROMTbl[1][1]: E0041000, CID: B105900D, PID: 001BB975 ETM-M7
    65. ROMTbl[1][2]: E0042000, CID: B105900D, PID: 004BB906 CTI
    66. ROMTbl[0][1]: E0040000, CID: B105900D, PID: 000BB9A9 TPIU-M7
    67. ROMTbl[0][2]: E0043000, CID: B105F00D, PID: 001BB101 TSG
    68. Cache: Separate I- and D-cache.
    69. I-Cache L1: 32 KB, 512 Sets, 32 Bytes/Line, 2-Way
    70. D-Cache L1: 32 KB, 256 Sets, 32 Bytes/Line, 4-Way
    71. ERROR: Could not find core in Coresight setup
    72. ERROR: Could not connect to target.
    73. Target connection failed. GDBServer will be closed...Restoring target state and closing J-Link connection...
    74. Shutting down...
    75. Could not connect to target.
    76. Please check power, connection and settings.
    Display All
  • Hello,

    Thank you for your inquiry.
    Generally the J-Link does not care if a CPU is in tickless mode or not.
    If it hits a WFI it depends on the target device how it will behave.
    Should the target device disable debug clocks and/or the debug interface J-Link can't connect to the device.
    For more information we recommend consulting the imxRT user guide or NXP support directly.

    Best regards,
    Nino
    Please read the forum rules before posting: Forum Rules

    Keep in mind, this is not a support forum. Its main purpose is user to user interaction.
    Our engineers will try to answer your questions between their projects if possible but this can be delayed by longer periods of time.
    Should you be entitled to support you can contact us via our support system: segger.com/ticket/

    Or you can contact us via e-mail.