Hi,

I am a beginner in freertos. Please Help me

When I compile this small below program it has compiled but it is not make.i am getting Link Error.

Link Error: Undefined: "vApplicationStackOverflowHook" Referenced from "vTaskSwitchContext" in.

(and i am using Coldfire MCF52259 Microcontroller)

void mytask(void *pvParameters) { while(1) { MCFGPIODDRTC=0x0F; MCFGPIOSETTC=0x0F; vTaskDelay( 500 / portTICKRATEMS); MCFGPIOCLRTC=0x0F; } } int main(void) {

xTaskCreate(mytask,(signed char*) "mytask", configMINIMAL_STACK_SIZE, NULL, 1, NULL);
return 0;

}

This is FreeRTOSConfig.h file which i have used for this above program

/* Library includes. */

/----------------------------------------------------------- * Application specific definitions. * * These definitions should be adjusted for your particular hardware and * application requirements. * * THESE PARAMETERS ARE DESCRIBED WITHIN THE 'CONFIGURATION' SECTION OF THE * FreeRTOS API DOCUMENTATION AVAILABLE ON THE FreeRTOS.org WEB SITE. * * See http://www.freertos.org/a00110.html. *----------------------------------------------------------/

/* Set the following definitions to 1 to include the API function, or zero to exclude the API function. */

/* This demo makes use of one or more example stats formatting functions. These format the raw data provided by the uxTaskGetSystemState() function in to human readable ASCII form. See the notes in the implementation of vTaskList() within FreeRTOS/Source/tasks.c for limitations. */

void vApplicationSetupInterrupts( void );

/* Ethernet configuration. */

#error configFEC_BUFFER_SIZE must be a multiple of 16.

Hello, it is because you have asked to check for stack overflow in your FreeRTOSConfig.h: configCHECKFORSTACK_OVERFLOW Set it to 0 if you want Stack overflow disabled. Altough I recommend to have it enabled. Simply add something like this to your application:

void FRTOS1vApplicationStackOverflowHook(xTaskHandle pxTask, signed portCHAR pcTaskName) { / This will get called if a stack overflow is detected during the context switch. Set configCHECKFORSTACKOVERFLOWS to 2 to also check for stack problems within nested interrupts, but only do this for debug purposes as it will increase the context switch time. / (void)pxTask; (void)pcTaskName; taskDISABLE_INTERRUPTS(); / Write your code here ... */ for(;;) {} }

If you are using ColdFire V2 (MCF52259) with CodeWarrior, then you might have a look at my Processor Expert component for FreeRTOS: it supports many cores, including ColdFire: http://mcuoneclipse.com/2012/06/28/tutorial-freertos-on-demojm/ http://mcuoneclipse.com/tag/freertos/

I hope this helps.