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




Loading

LPC1768 xTaskCreate() only possible in main()-function?

Posted by lagavulin21 on October 27, 2013

Hi,

have the xTaskCreate()-function always be started out of the main()-function? I cant start both tasks by using my DCLTASK()-function in similar way to the code snippet below.

I assume there is a problem with my DCLTASK()-function because if I will use the xTaskCreate()-function out from the main()-function, everything works fine

Can someone give me a hint?

# header file
struct rtosTask
{
    pdTASK_CODE pvTaskCode;
    signed portCHAR pcName;
    unsigned portSHORT usStackDepth;
    void *pvParameters;
    unsigned portBASE_TYPE uxPriority;
    xTaskHandle *pxCreatedTask;
};

typedef struct rtosTask RTOSTASK;

void DCLTASK(RTOSTASK task);
# function DCLTASK
void DCLTASK(RTOSTASK task)
{
xTaskCreate(task.pvTaskCode, task.pcName, task.usStackDepth, task.pvParameters, task.uxPriority, task.pxCreatedTask);
}
# main()-function
RTOSTASK task1, task2;
// Task 1
xTaskHandle xHandle1;
task1.pcName = "Task1";
task1.pvTaskCode = vTask1;
task1.uxPriority = 1;
task1.pxCreatedTask = NULL;
task1.usStackDepth = 1000;
task1.pvParameters = NULL;

// Task 2
xTaskHandle xHandle2;
task2.pcName = "Task2";
task2.pvTaskCode = vTask2;
task2.uxPriority = 2;
task2.pxCreatedTask = NULL;
task2.usStackDepth = 1000;
task2.pvParameters = NULL;

// dont work!
// DCLTASK(task1);
// DCLTASK(task2);

// works! but I dont understand the difference to DCLTASK()
xTaskCreate(task1.pvTaskCode, task1.pcName, task1.usStackDepth, task1.pvParameters, task1.uxPriority, task1.pxCreatedTask);
xTaskCreate(task2.pvTaskCode, task2.pcName, task2.usStackDepth, task2.pvParameters, task2.uxPriority, task2.pxCreatedTask);

LPC1768 xTaskCreate() only possible in main()-function?

Posted by richard_damon on October 27, 2013

Are you sure the tasks are being created? One big thing to note is that your DCLTASK will get the RTOSTASK structure BY VALUE (i.e. a copy), so that the anything set by it in xTaskCreate will be thrown away.


LPC1768 xTaskCreate() only possible in main()-function?

Posted by lagavulin21 on October 27, 2013

You are right! Maybe it's not the most efficient way to program MCUs but if I create only one task (by using DCLTASK) then it works. Same procedure with two tasks, no chance ...


[ 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