Quality RTOS & Embedded Software

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


take/give semaphore in vApplicationTickHook

Posted by Jeff Andle on May 29, 2012
I recently added code that needs to acquire a semaphore (I suppose I could ignore it for what I want to do...) on a tick hook timer. Since calling

xSemaphoreTake(xMutexMBREGS, usTime)

resets my dsPIC33, I am guessing that I need to use

xSemaphoreTakeFromISR( xSemaphore, pxHigherPriorityTaskWoken )

Is this true?
If so, and if pxHigherPriorityTaskWoken is true, do I really want to make the jump from the tick hook?

The end goal is to monitor data aging of MODBUS registers on the tick timer and to reset them to uninitialized if the app does not refresh them periodically.

RE: take/give semaphore in vApplicationTickHook

Posted by Jeff Andle on May 29, 2012
ah, search first, ask second...


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

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

Latest News

NXP tweet showing LPC5500 (ARMv8-M Cortex-M33) running FreeRTOS.

Meet Richard Barry and learn about running FreeRTOS on RISC-V at FOSDEM 2019

Version 10.1.1 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