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christophe239955_stm1
christophe239955_stm1
Associate II
October 17, 2008
Question

Serial Wire Debug with 2 Controllers

  • October 17, 2008
  • 2 replies
  • 737 views
Posted on October 17, 2008 at 11:47

Serial Wire Debug with 2 Controllers

    This topic has been closed for replies.

    2 replies

    christophe239955_stm1
    christophe239955_stm1Author
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 12:48

    We are designing a board with two STM32 controllers on it.

    We would like to use Serial Wire Debug (SWD) interface for debugging.

    Is it possible to connect both controlles with one J-Link adapter (at the same time)? ->Connect SWCLK and SWDIO of both controllers together on one connector.

    Haven't found help on that issue in documentation.

    Thanks for any help.

    jj_it
    jj_it
    Associate II
    May 17, 2011
    Posted on May 17, 2011 at 12:48

    I've not seen any mention of SWD cascade in the literature. Fear the common connection of SWDIO, SWCLK seems ok. Perhaps a similar request to IAR will shed light.

    Should the answer be no - believe it simplest/lowest cost to implement a SWDIO spdt switch - using a small shunt. This yields the case in which - temporarily - only one STM32 is programmed - should there be any data interconnects this may be problematic.

    Probably safest if you power down prior to moving the shunt from STM32 #1 to #2.

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