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printf_redirect example project

Tom Cooper

I've followed the steps here to copy the "printf_redirect" example project from the pack installer:
www.keil.com/.../_retarget__examples_er.html

I left everything as is within the example project. When I rebuild the "CM0 Simulator" target, it succeeds but with 1 warning:

C:\Keil_v5\ARM\PACK\Keil\ARM_Compiler\1.6.0\Source\EventRecorder.c(660): warning:  #1215-D: #warning directive: "Invalid Time Stamp Source selected in EventRecorderConf.h!"

When I start debug in the simulator, it runs the included debug.ini file as expected. But I only see values updating in the "My First Viewer" window, not the Event Recorder or Debug (printf) Viewer windows.

Does something need to be done for the compiler warning? Is there a step not listed at the URL above that I'm missing? I just expected this example project to work out of the box. My immediate goal is to simply run this example project and see output in the Debug (printf) Viewer, so that I may later adapt an existing project to similarly redirect I/O.

Keil uVision: version 5.23.0.0
Toolchain: MDK-ARM Standard Cortx-M only, version 5.23
Compiler/Assembler/etc: version 5.06 update 4 (build 422)

Thanks!

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  • 0 in reply to ChenTang

    From my link:
    "This simple application is already set to redirect printf output on an ARM Cortex-M0 to the Event Recorder."

    So that statement appears to be wrong, and modifying the project to use the non-default timestamp source is required? Then why does this project also include the debug.ini file with the simulated DWT Cycle Counter? Maybe it's just oversight, although the target is named "CM0 Simulator".

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  • 0 in reply to ChenTang

    From my link:
    "This simple application is already set to redirect printf output on an ARM Cortex-M0 to the Event Recorder."

    So that statement appears to be wrong, and modifying the project to use the non-default timestamp source is required? Then why does this project also include the debug.ini file with the simulated DWT Cycle Counter? Maybe it's just oversight, although the target is named "CM0 Simulator".

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