Quality RTOS & Embedded Software

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


High tick freq., starving and overhead?

Posted by Albin Stigo on September 26, 2009

I'm working on a open source midi controller (keyboard). It has a keyboard, an LCD display and 8 rotary encoders. I would like the keyboard matrix (8x24 switches) to be scanned exactly every 1ms (there are to switches under each key for measuring velocity, because of this bouncing is not a big problem). The encoders and LCD is not time critical. I'm using an atmega128 running at 12MHz.

What Tick Frequency would be appropriate?? What is the overhead of the rtos kernel? Instructions / tick, instructions / context switch?

Atb, Albin

RE: High tick freq., starving and overhead?

Posted by MEdwards on September 26, 2009
Why not just use a tick frequency of 1KHz then use the tick hook to do the scanning?

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

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

Latest News

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