{"id":6030,"date":"2021-05-26T08:48:21","date_gmt":"2021-05-26T08:48:21","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=6030"},"modified":"2023-09-02T16:18:25","modified_gmt":"2023-09-02T10:48:25","slug":"freertos-lecture-29-exercise-creating-freertos-tasks-part-2","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/freertos-lecture-29-exercise-creating-freertos-tasks-part-2\/","title":{"rendered":"FreeRTOS Lecture 29 – Exercise: Creating FreeRTOS Tasks Part-2"},"content":{"rendered":"
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Exercise: Creating FreeRTOS Tasks Part-2<\/span><\/h1>\n
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After creating a task using xTaskCreate, you may observe lots of red lines, as shown below.<\/span><\/p>\n

This is because before using any FreeRTOS related header file, that means the header file related to different services like tasks, queues, semaphores, mutexes, etc. always include the main header file, i.e., FreeRTOS.h, which is there in the 3rd party FreeRTOS source include shown in Figure 1. <\/span><\/p>\n

This is a very important header file that must be included first.<\/span><\/p>\n

int<\/span> main(void<\/span>)\r\n{\r\n    \/\/1. Reset the RCC clock configuration to the default reset state.<\/span>\r\n    \/\/HSI ON, PLL OFF, HSE OFF, system clock = 16MHz, cpu_clock = 16MHz<\/span>\r\n    RCC_DeInit();\r\n\r\n    \/\/2. update the SystemCoreClock variable<\/span>\r\n    SystemCoreClockUpdate();\r\n\r\n    \/\/3. lets create 2 tasks , task-1 and task-2<\/span>\r\n    xTaskCreate( vTask1_handler,\"Task-1\", configMINIMAL_STACK_SIZE,NULL,2,&xTaskHandle1 );\r\n\r\n    for<\/span>(;;);\r\n}<\/pre>\n
Creation of task 1 by using xTaskCreate() API<\/span><\/p>\n
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Figure 1. Including the FreeRTOS header file into the project.<\/span><\/figcaption><\/figure>\n
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Once you include the header file, you can see that most of the errors will vanish. There are some other errors that we will address later. Now let\u2019s create another task. Before that, let\u2019s implement the vTask1_handler or task function. The prototype of the task function is as shown in Figure 2. Now let\u2019s implement the task function for Task1 as follows:<\/span><\/p>\n
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Figure 2. Prototype for task function.<\/span><\/figcaption><\/figure>\n
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