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


Increasing configTICK_RATE_HZ beyond 1000?

Posted by Ron Blancarte on April 8, 2010
Is the maximum tick granularity 1000 Hz? I tried setting that higher than 1000, but that caused issues with anything that used portTICK_RATE_MS (bunch of divide by ZEROs). Or am I overthinking this and needing to change the application of portTICK_RATE_MS? Let me know.

RE: Increasing configTICK_RATE_HZ beyond 1000?

Posted by Richard on April 9, 2010
No you can make the tick faster than 1000Hz, but consider carefully if you really want to do this as 1000Hz is already fast, and the faster you make it the higher the kernel overhead will be.

You are indeed correct that going faster than 1000Hz will prevent portTICK_RATE_MS from working as the period will be sub 1ms. portTICK_RATE_MS is used for convenience in the demo applications, it is not used anywhere in the kernel code itself. Therefore, while setting the tick rate faster than 1000Hz would prevent the demo application tasks from working (without modification) it will not break the kernel itself.


[ 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