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


Resuming a delaying task

Posted by boraozgen on June 20, 2017

Hello everybody,

I have a task that executes periodically using vTaskDelay(). I would like to suspend and resume this task using an external interrupt, e.g. a switch button. This can be achieved using vTaskSuspend() and vTaskResumeFromISR(), however I want my task to complete its delay period before running again, even if it has been resumed using vTaskResume() before the delay period is over. As I read on the book, the vTaskResume() call puts the task into ready state immediately, ignoring the previous delay call. Is there a way to implement this functionality? Which mechanisms would you use?

Resuming a delaying task

Posted by rtel on June 20, 2017

You will have to do this manually in the implementation of the task. Look at the example code on this page: http://www.freertos.org/xTaskCheckForTimeOut.html You can use vTaskSetTimeoutState() before delaying, then xTaskCheckForTimeout() after it has delayed to see if it delayed for the entire delay period. If it didn't then the parameter in xTaskCheckForTimeout() will tell you how long there is left to block and you can call the delay function again with that time.

[ 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