Quality RTOS & Embedded Software

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


AT91SAM7S256 modes in FreeRTOS

Posted by Adam Turowski on February 26, 2009
Hi all!!!
I've got two questions:

1) Could you please tell me, which ARM processor modes are used during execution of which parts of FreeRTOS. I mean which mode is used during for example scheduler execution, semaphore take etc.

2)Could you also please tell me what are the minimal stack sizes for these modes and if stacks for all processor modes has to be allocated and/or initialized?

RE: AT91SAM7S256 modes in FreeRTOS

Posted by Dave on February 26, 2009
For stack sizes check the demo apps.

Main is called from Supervisor mode. Supervisor mode and IRQ mode are both used for context switching. Tasks run in System mode.

RE: AT91SAM7S256 modes in FreeRTOS

Posted by Adam Turowski on February 26, 2009
Thank you for information.

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

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

Latest News

Version 10.1.0 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