How make a tracing campaign with OpenOCD?

Development Boards MicroMod
1

Hi folks,

i need to make some tracing campaign of my program execution on the stm32f4discovery board.

Is this possible with OpenOCD? Where i can find some documentation about?

Thanks :smiley:

2

Hello trelaron,

Warning: this may be completely wrong.

Real time trace:

  • - For real time tracing I believe you need hardware such as J-Trace.
  • - I don't think OpenOCD has any support for this.
  • - pins PE2 - PE6 are used on the STM32F407VGT6.
  • - On the F4Dsicovery pin E2 is connected to MEMS chip - I don't know if that would interfere with trace.

    • printf** via jtag:

  • - OpenOCD does provide a debug message system (using the Core Debug Data Register).
  • - Spencer Oliver has provided an example and readme file in contrib/libdcc
  • - You would have to add debug_write_str() or similar statements to your code at each [subroutine entry]
  • - I have not tried this and don't know how performance compares to a high speed serial port.

    • **I said printf but there is no formatting - it support raw words, halfwords, chars, and strings.

    3

    Thanks for the reply hsutherl !! :slight_smile: