undefined reference to ‘_xQueueCreateMutex’
Posted by
ady001 on April 28, 2016
Dear Support,
I’ve been evaluating the RTOS on the PIC24 platform and have been impressed. I’ve got tasks with priorities, messages queues, critical sections etc.
I wanted to have a play with a Mutex but the linker does not seem to like xSemaphoreCreateMutex() even though it is happy with my later use of xSemaphoreGive() and xSemaphoreTake() in the same file. Maybe I’ve missed a header file or a defintion somewhere but I’m stuck.
/* My includes */
include “FreeRTOS.h”
include “task.h”
include “semphr.h”
include “queue.h”
/* My Mutex handle */
static SemaphoreHandle_t MutexHandle_AppTestLED = NULL;
/* My Mutex creation */
void vApplicationMutex(void)
{
MutexHandle_AppTestLED = xSemaphoreCreateMutex();
}
// Error thrown by the linker…
: In function _vApplicationMutex':
: undefined reference to
xQueueCreateMutex’
build/default/production/ext/1472/ApplicationTask.o(.text+0x12): In function _vApplicationMutex':
: undefined reference to
_xQueueCreateMutex’
The function xSemaphoreCreateMutex() is in blue in the project, showing it is recognize as a function and ‘Navigate to defintion’ opens the file semphr.h at the extract below ( where the section is active in the compilation ).
if( configSUPPORTDYNAMICALLOCATION == 1 )
define xSemaphoreCreateMutex() xQueueCreateMutex( queueQUEUETYPEMUTEX )
endif
Please can you help ?
Kind regards,
Ady
undefined reference to ‘_xQueueCreateMutex’
Posted by
davedoors on April 28, 2016
Is configUSE_MUTEXES set to 1 in FreeRTOSConfig.h?
undefined reference to ‘_xQueueCreateMutex’
Posted by
ady001 on April 28, 2016
Many thanks that has solved it.
In fact configUSE_MUTEXES was not in FreeRTOSConfig.h at all else I would have given it a try !
I’d expect all configurable options to be in this file ?
undefined reference to ‘_xQueueCreateMutex’
Posted by
rtel on April 28, 2016
That is quite an old demo, perhaps even created before there were
mutexes? http://www.freertos.org/a00110.html
undefined reference to ‘_xQueueCreateMutex’
Posted by
ady001 on April 28, 2016
OK fair enough. I used the demo to get up and running, I’ll look for the latest FreeRTOS source.