Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Real time embedded FreeRTOS mailing list 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT Training




Loading

avr-gcc naked define for task functions: cave

Posted by Martin Bock on January 9, 2013
Hi everyone,

after a long and intense search for a strange behaviour of a little program which uses RTOS 7.3.0 on an ATMega644 I want to share this little caveat with all of you and maybe the Real Time Engineers staff may put a little warning onto their FAQ.

In the FAQ (http://www.freertos.org/FAQMem.html) is stated you can use the naked attribute to ommit prologue and epilogue of an never returning function like the main and the task function.
But beware that also the frame pointer will not be set up. Therefore if your "naked function" uses too many local variables than could be hold in the internal registers they can not be correctly swapped out using the frame pointer.

Beside this I would like to say that FeeRTOS is a really cool piece of software, thanks for that.

HTH, kind regards Martin Bock

RE: avr-gcc naked define for task functions: cave

Posted by Richard on January 13, 2013
Thanks - the offending comment has been removed. It is rather old and is no longer valid. In fact, I noticed a few things on that page that needed modification. Some of the old documentation needs a bit of a purge.

Regards.


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




Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.


Free TCP/IP and file system demos for the RTOS


Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

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

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

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

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists