Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem


problem with mutex

Posted by Prince Chauhan on November 21, 2012
My question is related to semaphores. I am working on STM32VL_DISCOVERY Board, using the ATOLLIC TRUE STUDIO with FRE RTOS. I looked up the mutex semaphore in the API reference, and used them in my program, and compiled it. Got an error complaining about an "undefined reference to xQueueCreateMutex". If I drop in a binary semaphore is compiles just fine. Again, I'm sure I'm just missing something simple. Any ideas?

RE: problem with mutex

Posted by Richard on November 21, 2012
Set configUSE_MUTEXES to 1 in FreeRTOSConfig.h.


[ Back to the top ]    [ About FreeRTOS ]    [ Privacy ]    [ Sitemap ]    [ ]

Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 of the FreeRTOS kernel is available for immediate download. MIT licensed.

View a recording of the "OTA Update Security and Reliability" webinar, presented by TI and AWS.


FreeRTOS and other embedded software careers at AWS.

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Espressif ESP32

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers


STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS

Xilinx Microblaze and Zynq partner