Quality RTOS & Embedded Software

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


Loading

How to make a task block on a specific notification?

Posted by bencohavi on January 16, 2018

Hello,

Is there a way to make a task block on a specific notification?

In other words, I want to block the task until a certain notification arrives. In case other notifications have arrived during that time, I don't want my task to resume action.

Thanks,

Ben


How to make a task block on a specific notification?

Posted by richard_damon on January 16, 2018

In general, when a task blocks in FreeRTOS it is blocking for a specific event. If it gets from a Queue (and no data is available), the task blocks on that Queue. If it takes a Semaphore or a Mutex, it waits for that Semaphore or Mutex.

If you are waiting on a direct to task notification, the task will only unblock on a direct to task notification, but I don't think you can choose to only be unblocked on certain bits. I think you could use an EventGroup to do something like that.

The more common question is how to make a task unblock on multiple sources, which is where the QueueSets and EventGroups came from, to provide solutions to that.


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




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

Latest News

Meet us at Embedded World. Hall 3A-525.

Hear from Richard Barry at Embedded World. Feb 28, 16:00, Hall 4-428.

Video: Watch James Gosling & Richard Barry at re:Invent, Las Vegas 2017.

FreeRTOS kernel V10.0.1 is available for immediate download. Now MIT licensed.


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

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