Quality RTOS & Embedded Software

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


Privilege mode

Posted by jmmifsud on September 2, 2014


I'm running FreeRtos on a Texas-Instruments RM48 (Cortex R4 core). When I try using the xTimer function, it is only working when the xTimer functions are called from main() before the vTaskStartScheduler(); or from callback routine. On this device the MPU is used to protect a portion of Flash and RAM for kernel usage.

All user task are running in user mode(non privilege mode) and so cannot use the xTimer API.

Can someone clarify or I'm doing something completly wrong.

Thanks in advance.


Privilege mode

Posted by rtel on September 2, 2014

We don't provide an MPU version of the Cortex-R port, so really it is a question for whoever supplied you the code - but if it is modeled on the Cortex-M MPU code then this is a known issue and is on the 'known issues' list. You can add the timer functions to the list of privileged functions relatively easily - if you search hard enough in this forum (you may be better off using the archive on the FreeRTOS.org webiste) you may find other discussions on this topic.


[ 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.

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