Problem with multiple format arguments when using SEGGER_RTT_printf

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    • Problem with multiple format arguments when using SEGGER_RTT_printf

      Hi

      I have the following:

      SEGGER_RTT_printf(0, "midnight_tick: last: %u, now: %u\r\n", last, now);
      SEGGER_RTT_printf(0, "midnight_tick: now: %u, last: %u\r\n", now, last);

      This prints:

      midnight_tick: last: 10957, now: 0
      midnight_tick: now: 10957, last: 0

      Note that the second argument is always printed as 0 but none of the args is 0. There is no concurrency involved, the arguments last and now dont change between the two calls.


      Sorry, if I am missing something trivial ...

      Kind regards
      Peter

    • Hi Peter,
      We are not aware of any such issue.

      I just gave it a quick try and it works without issues on my side, using an STM32F407VE:

      Source Code

      1. SEGGER_RTT_printf(0, "Some %u Test %u.\n", 123, 456);
      2. SEGGER_RTT_printf(0, "Some %u Test %u.\n", 456, 123);
      Resulted in the lines:
      Some 123 Test 456.
      Some 456 Test 123.

      Could you please provide a working sample showing the issue?
      Which MCU are you working with?
      Are you using the RTT source code from the latest release?
      segger.com/downloads/jlink#J-L…twareAndDocumentationPack

      Best regards,
      Fabian
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