Quality RTOS & Embedded Software

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




Loading

Difference between variables in FreeRtOS

Posted by Willem on November 16, 2008
In the demo code's that i've read, (PIC32) it contains variables only defined by:

portBASE_TYPE
portSHORT
portLONG
etc.

What is the benefit of using those assignments instead of short / long / int etc.?

Does it save the variable to static when the task gets killed?

RE: Difference between variables in FreeRtOS

Posted by Richard on November 16, 2008
FreeRTOS.org runs on 8, 16 and 32bit devices, so these definitions are just for portability. Each port defines portSHORT to be a 16 bit type, portLONG to be a 32bit type and portBASE_TYPE to be the most efficient type for the architecture (normally 8bits for 8bit architectures, 16bits for 16bit architectures and 32bits for 32bit architectures).

The demo code also follows this convention because it is run on all the supported processors. Your application code can do whatever, it does not need to use the same definitions and can use short, char, etc. directly if preferable.

Regards.

RE: Difference between variables in FreeRtOS

Posted by Dmitriy on November 24, 2008
Richard!
Is there some port/compiller there short int (portSHORT) is not 16 bit wide?
Is there some port/compiller there long int (portLONG) is not 32 bit wide?


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




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

Latest News

FreeRTOS kernel V10 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