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Thread: XMC1400: Cannot enter in debug mode via SWD

  1. #1
    New Member New Member Zanuttini is on a distinguished road
    Join Date
    Oct 2017

    XMC1400: Cannot enter in debug mode via SWD


    I'm working on the programming algorithm for the XMC1402-0064 device. Unfortunately I cannot communicate with the device via SWD.
    The connection sequence used is the same for the Cortex device ( STM32, NXP etc) and also described in the "XMC1400 AA-Step XMC1000 Family Reference Manual with 50 clock cycles data = 1s. However, I'm not able to read the SW_DP IDCODE.
    When I tried with J-Link, I got this:

    Click image for larger version

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    After that, I tried again with my tool and it works successfully, even after POR. I can read the IDCODE and perform all the SWD commands.
    It seems that the J-Link sends a special sequence to enable the SWD protocol.

    Is there a special command (maybe via SPD) to send before starting the connection sequence?

    Thanks in advance

    Best regards,


  2. #2
    Advanced Advanced aurixuser is on a distinguished road
    Join Date
    Jan 2017
    Is it a new XMC1400 chip?

    If yes, then you should modify the BMI before you could use the SWD interface. New XMC1x devices are configured as ASC interface, bizzarelly.

  3. #3

    Infineon Employee
    Infineon Employee
    jferreira will become famous soon enough
    Join Date
    Oct 2012

    Once you have connected with JLink commander, get the BMI value by typing:
    Current BMI mode: 2.

    where the mode represents:
    0 ASC Bootstrap Load Mode (ASC_BSL)
    1 User Mode (Productive)
    2 User Mode (Debug) SWD0
    3 User Mode (Debug) SWD1
    4 User Mode (Debug) SPD0
    5 User Mode (Debug) SPD1
    6 User Mode (HAR) SWD0
    7 User Mode (HAR) SWD1
    8 User Mode (HAR) SPD0
    9 User Mode (HAR) SPD1

    Which mode do yout get?
    If you want to set the BMI mode to SWD0 (P0.14/P0.15), just use JLink command, SetBMI 2

    The views expressed here are my personal opinions, have not been reviewed or authorized by Infineon and do not necessarily represent the views of Infineon.

  4. #4
    New Member New Member Zanuttini is on a distinguished road
    Join Date
    Oct 2017
    Thank you so much for your replies.

    I tried to connect via ASC_BSL and it works! After sending "0x00 0x6C" it answers 0x5D.

    Again, thank you for your support!

    Now, if I want to change the BMI via UART, I have to download the flash loader and then send the "execute ‘Change BMI’ routine" command. Am I right?
    Is it correct the syntax command described in the AP32277 - ASC Bootstrap loader for XMC1000 document p.18?

    Click image for larger version

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