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

coroutines scheduling

Posted by Kirby W. Cartwright on March 7, 2007
People,

I've been looking at either using multitasking or coroutines from the FreeRTOS package.

I developed a test package with a task to blink the LEDs, and also a coroutine to blink the LEDs.

Everything works, but as part of my comparison I wanted to remove everything to do with tasking, and just use the coroutines module and its scheduler. I was not able to totally remove the "tasks.c" file.

Has anyone managed to use the coroutines file and scheduler separately?

Other than that the package is sweet.

Kirby W. Cartwright
Sr. Firmware Design Engineer
Invensys Climate Controls
8115 US 42 N
Plain City, OH 43064
PH: (614)873-9476
FAX: (614)873-9290
mailto:kirby.cartwright@invensyscontrols.com

RE: coroutines scheduling

Posted by embeddedc on March 8, 2007
Coroutines run in the idle task so you need at least the parts of the task code to create the idle task. The tick interrupt will still try to save and restore the task context during the interrupt, this might be the only reason why.

I'm not vary familiar with the coroutine functionality, but I think it should be possible to alter the code a bit so the task code is not required. In particular the preemptive tick should not be used, the cooperative tick is just a normal interrupt and does nothing with the context.

You could just set the idle task stack size to be very large and not create any other tasks. Then the only disadvantage would be the build would include some code that was not required. Removing unused symbols would help.


[ 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