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Problem adding FreeRTOS Software Timers to MQTT Client example

Scott Godin75
Prodigy 250 points
Other Parts Discussed in Thread: CC3200, CC3200SDK

I am attempting to add a FreeRTOS Software Timer to send out a periodic message about system status in the MQTT Client example. 

To start, I update the configUSE_TIMERS define in FreeRTOSConfig.h to the value of 1. I then re-built my oslib project and verified that a timers.obj file was created. 

I preceded to add the required include and other components to main.c to introduce a timer into the project. 

#include "FreeRTOS.h"
#include "task.h"
#include "semphr.h"
#include "timers.h"
#include "portmacro.h"

TimerHandle_t Msg_Timer;

void MsgTimerCallback( TimerHandle_t pxTimer )
{

...

}

Msg_Timer = xTimerCreate("MsgTimer", (100 * 1000), pdTRUE, NULL, MsgTimerCallback);

xTimerStart(Msg_Timer, 0);

When building the project, the linker complains about unresolved symbols, xTimerCreate and xTimerGenericCommand. 

Has anyone else encountered this problem?

Thanks,

Scott

Details:

Code Composer Studio V6.1.0.00104

TI Compiler V5.2.5

SDK: CC3200 1.1.0

  • 0
    TI__Genius 16370 points
    Scott, Please allow me to check and get back.-/Praneet
  • 0 in reply to Helio Neves
    Prodigy 250 points
    Greetings Helio and Praneet,

    Per your suggestion Helio, I changed the include to "timers.c", and it does indeed resolve the xTimerCreate and xTimerGenericCommand define issue. However, it introduced an additional undefined function "vQueueWaitForMessageRestricted". I have added #include "queue.h" in an attempt to correct this issue, but that did not fix the problem.

    Interesting the FreeRTOS manual still calls out #include "timers.h" not the c file.
  • 0 in reply to Scott Godin75
    TI__Genius 16370 points
    Scott,

    Suggest you post these queries on a Free-RTOS forum.

    And, for your requirement of sending out a periodic message about system status, you could use CC3200's DriverLib APIs to start a periodic timer and take the required actions every time it expires - Please take references from the sample application @ 'cc3200-sdk\example\timer' for more details.

    -/Praneet
  • 0
    Intellectual 890 points

    Information on including software timers in a FreeRTOS application is provided on the following link:

    http://www.freertos.org/Configuring-a-real-time-RTOS-application-to-use-software-timers.html

    As you will see, you have to set configUSE_TIMERS to 1 in FreeRTOSConfig.h and add the FreeRTOS/Source/timers.c source file to your project - that is - build that source file with your project to make the API available.  Then to use a timer in a different source file you #include "FreeRTOS.h" followed by "#include "timers.h".

    > However, it introduced an additional undefined function "vQueueWaitForMessageRestricted"

    That sounds like a version number mismatch.  Each FreeRTOS source file includes a version number at the top - is the version number in your timers.c source file the same as the version number in your other FreeRTOS source files?  I suspect not.  From memory vQueueWaitForMessageRestricted() is a relatively new function that was added to improve our tickless low power support.  http://www.FreeRTOS.org/History.txt

  • 0 in reply to FreeRTOS.org
    Prodigy 250 points

    Good Day Richard,

    I reviewed each of the FreeRTOS file contained in TI CC3200 SDK  (..\CC3200SDK_1.1.0\cc3200-sdk\third_party\FreeRTOS). The heading comment in each of the .c & .h files contained the following: 

    "FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd."

    Therefore, all appears in alignment.

    However, I noted in History.txt that you had introduced a helper macro "pdMS_TO_TICKS" in V8.0.1. This macro does not appear to be present in the FreeRTOS code base provide in the CC3200 SDK provided by TI. 

    Thank you,

    Scott