Quality RTOS & Embedded Software

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


problem freertos demo & new file

Posted by Piotr on June 20, 2007
What should i do to add new project? When I try to add new file to existing demo files, the error occurs: "Error[Pe020]: identifier "pdTASK_CODE" is undefined D:\FreeRTOSV4.0.2\FreeRTOS\source\include\portable.h 157. On the freertos.org is written: "A preconfigured starting point for new applications - to ensure the correct development tool setup (compiler switches, debugger format, etc) it is recommended that new applications are created by modifying the existing demo projects." Can I change the name of the demo files?

RE: problem freertos demo & new file

Posted by embeddedc on June 20, 2007
Did you include FreeRTOS.h at the top of the new file?

RE: problem freertos demo & new file

Posted by Piotr on June 21, 2007
Yes, I did

RE: problem freertos demo & new file

Posted by Richard on June 21, 2007
There is not dependency on the file names. Provided FreeRTOS.h is included at the top of the file and BEFORE task.h, queue.h or semphr.h, then you should not get this error if modifying an existing project. I suspect there is some kind of header file dependency issue somewhere.

Try making the file almost empty, as:

---file start

#include "FreeRTOS.h"
#include "task.h"

void vDummyFunction( void )
vTaskDelay( 10 );

---file end

Does it compile then?

[note this file will not run unless vDummyFunction() is called from within an already created task, its just to test the compilation].


RE: problem freertos demo & new file

Posted by Piotr on June 21, 2007
Thanks! I had FreeRTOS.h included but not before task.h. I put it on the top of the file and it solved the problem.

[ 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