{"id":5939,"date":"2021-03-26T10:40:36","date_gmt":"2021-03-26T10:40:36","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=5939"},"modified":"2023-01-19T17:03:54","modified_gmt":"2023-01-19T11:33:54","slug":"freertos-behind-the-scene-task-creation","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/freertos-behind-the-scene-task-creation\/","title":{"rendered":"FreeRTOS Lecture 24 – FreeRTOS behind the scene Task Creation"},"content":{"rendered":"
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FreeRTOS behind the scene Task Creation <\/span><\/h1>\n
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Now let\u2019s understand the FreeRTOS behind the scenes task management.<\/span><\/p>\n

What happens when you create a task?<\/span><\/p>\n

Let\u2019s say you have a microcontroller RAM memory, and let\u2019s say some amount of space, as shown in Figure 1, is reserved for the heap purpose. <\/span><\/p>\n

The configTOTAL_HEAP_SIZE determines the amount of RAM that must be utilized for heap space. The rest of the RAM space can be used for global arrays, data, static variables, etc.<\/span><\/p>\n

\"Figure
Figure 1. RAM memory space reserved for the heap purpose.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

When you create a task by using xTaskCreate, it dynamically allocates memory for the task control block, and also, memory is allocated for the stack for Task 1, as shown in Figure 2. <\/span><\/p>\n

When you create a task, you also mention the stack depth in terms of words. <\/span><\/p>\n

For example, if the stack depth value is 512 words, then 512 x 4 bytes will be allocated as a stack in the heap memory. When you create another task, again, the task control block and the stack space for task 2 will be allocated in the heap memory, as shown in Figure 3.<\/span><\/p>\n

\"Memory
Figure 2. Memory allocated for the control block and stack of the Task 1.<\/span><\/figcaption><\/figure>\n

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\"Memory
Figure 3. Memory allocated for the control block and stack of the Task 2.<\/span><\/figcaption><\/figure>\n

 <\/p>\n

After that, in the further course of the program, if you create a semaphore, then the semaphore control block will be created in a heap (Figure 4). <\/span><\/p>\n

If you use queues, the queue control block and the queue item list will be dynamically created in a heap, as shown in Figure 5.<\/span><\/p>\n

\"Creation
Figure 4. Creation of semaphore control block.<\/span><\/figcaption><\/figure>\n

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\"Creation
Figure 5. Creation of queue control block and queue item list.<\/span><\/figcaption><\/figure>\n

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That\u2019s how all these APIs will consume the heap whenever you create a task, semaphore, or queue. This is what happens behind the scenes when you create a task. All the items marked in Figure 6 are called dynamically created kernel objects.<\/span><\/p>\n

\"Dynamically
Figure 6. Dynamically created kernel objects.<\/span><\/figcaption><\/figure>\n

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FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n

Click here: https:\/\/fastbitlab.com\/course1<\/a><\/span><\/p>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

  FreeRTOS behind the scene Task Creation      Now let\u2019s understand the FreeRTOS behind the scenes task management. What happens when you create a task? Let\u2019s say you have a microcontroller RAM memory, and let\u2019s say some amount of space, as shown in Figure 1, is reserved for the heap purpose. The configTOTAL_HEAP_SIZE determines […]<\/p>\n","protected":false},"author":1,"featured_media":5941,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[19],"class_list":["post-5939","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-freertos-lectures","entry","has-media"],"yoast_head":"\nFreeRTOS Lecture 24 - FreeRTOS behind the scene Task Creation<\/title>\n<meta name=\"description\" content=\"FreeRTOS behind the scene Task Creation. 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