xTaskCreate(TaskFunction_t pvTaskCode, Create a new task with a specified affinity.
This function is similar to xTaskCreate, but allows setting task affinity in SMP system.
- Return
pdPASS if the task was successfully created and added to a ready list, otherwise an error code defined in the file projdefs.h
- Parameters
pvTaskCode: Pointer to the task entry function. Tasks must be implemented to never return (i.e. continuous loop), or should be terminated using vTaskDelete function.pcName: A descriptive name for the task. This is mainly used to facilitate debugging. Max length defined by configMAX_TASK_NAME_LEN - default is 16.usStackDepth: The size of the task stack specified as the number of bytes. Note that this differs from vanilla FreeRTOS.pvParameters: Pointer that will be used as the parameter for the task being created.uxPriority: The priority at which the task should run. Systems that include MPU support can optionally create tasks in a privileged (system) mode by setting bit portPRIVILEGE_BIT of the priority parameter. For example, to create a privileged task at priority 2 the uxPriority parameter should be set to ( 2 | portPRIVILEGE_BIT ).pvCreatedTask: Used to pass back a handle by which the created task can be referenced.xCoreID: If the value is tskNO_AFFINITY, the created task is not pinned to any CPU, and the scheduler can run it on any core available. Values 0 or 1 indicate the index number of the CPU which the task should be pinned to. Specifying values larger than (portNUM_PROCESSORS - 1) will cause the function to fail.
TaskHandle_t Task1; TaskHandle_t Task2; TaskHandle_t Task3; const int led1 = 2;// input 1 const int led2 = 3;// input 2 const int led3 = 4;// input 3 void setup() { Serial.begin(115200); pinMode(led1, INPUT); pinMode(led2, INPUT); pinMode(led3, INPUT); xTaskCreate(led_1,"Task1",1000,NULL,1,&Task1,0); // task running in core 0 delay(300); xTaskCreate(led_2,"Task2",1000,NULL,1,&Task2,0); // task running in core 0 delay(300); xTaskCreate(led_3,"Task3",1000,NULL,1,&Task3,1); // task running in core 1 delay(300); } void led_1( void * parameter ){ Serial.print("Task1 is running on core "); Serial.println(xPortGetCoreID()); for(;;){ digitalWrite(led1, HIGH); delay(300); digitalWrite(led1, LOW); delay(300); } } void led_2( void * parameter ){ Serial.print("Task2 is running on core "); Serial.println(xPortGetCoreID()); for(;;){ digitalWrite(led2, HIGH); delay(300); digitalWrite(led2, LOW); delay(300); } } void led_3( void * parameter ){ Serial.print("Task3 is running on core "); Serial.println(xPortGetCoreID()); for(;;){ digitalWrite(led3, HIGH); delay(300); digitalWrite(led3, LOW); delay(300); } } void loop() { }
