{"id":13521,"date":"2023-01-07T09:34:20","date_gmt":"2023-01-07T04:04:20","guid":{"rendered":"https:\/\/fastbitlab.com\/?p=13521"},"modified":"2023-09-18T16:33:40","modified_gmt":"2023-09-18T11:03:40","slug":"microcontroller-embedded-c-programming-lecture-156-structure-and-bit-fields-contd","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/microcontroller-embedded-c-programming-lecture-156-structure-and-bit-fields-contd\/","title":{"rendered":"Microcontroller Embedded C Programming Lecture 156| Structure and bit fields contd."},"content":{"rendered":"
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Structure and bit fields<\/strong><\/span><\/h1>\n
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In this article, let’s discuss one more use case of bit fields in C. <\/span><\/p>\n

Here is the problem statement.<\/span><\/p>\n

\"Figure
Figure 1. Problem statement<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Create a structure named “CarDetails” which comprises the above information. The structure should include the car’s speed, weight, color, and price. And we also know the maximum values of this information.<\/span><\/p>\n

For example, a car’s speed maximum value could be 400, the weight maximum value could be 500 kilograms, the color is just an ASCII code, and the maximum price could be 100 million dollars. <\/span><\/p>\n

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Structure without bit fields<\/span><\/strong><\/span><\/p>\n

To create a structure of that information without bit fields you can create a structure as shown in figure 2.<\/span><\/p>\n

\"Figure
Figure 2. Structure without bit fields<\/span><\/figcaption><\/figure>\n

 <\/p>\n

You use uint16 for the speed, uint16 for the weight, and select uint32 for the price. Structure without bitfields would consume 12 bytes of memory. <\/span><\/p>\n

Since you already know the maximum values of the member elements you can also use a structure with bit fields. <\/span><\/p>\n

Here to store the value 400 you know the maximum you would need is around 7 bits, to store the value 5000 maximum you would need 13 bits. <\/span><\/p>\n

Structure with bit fields<\/span><\/strong><\/span><\/p>\n

S<\/span>o, if you know all this information, then you can go with writing a structure with bit fields where we can write something like this, as shown in Figure 3.<\/span><\/p>\n

\"Figure
Figure 3. Structure with bit fields<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Here, speed, weight, and color these three variables consume 27 bits. So, 27 bits of 32 bits. So, 5 are remaining. In the remaining 5 bits, you cannot accommodate the 28 bits of information. That’s why you can split the 28 bits of information into 23 and 5. So, price_l is a price lower bits, and price_h is a price higher bits. It would take 4 + 4 = 8 bytes. <\/span><\/p>\n

Or you can also rewrite those 2 statements(lines 25 and 26) in one single statement using uint8_t price. This will also lead to say memory consumption.<\/span><\/p>\n

In the following article let’s discuss unions.  <\/span><\/p>\n

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

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

 <\/h2>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

  Structure and bit fields   In this article, let’s discuss one more use case of bit fields in C. Here is the problem statement.   Create a structure named “CarDetails” which comprises the above information. The structure should include the car’s speed, weight, color, and price. And we also know the maximum values of […]<\/p>\n","protected":false},"author":1,"featured_media":13525,"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":"enable","ocean_disable_heading":"default","ocean_post_title":"Structure and bit fields","ocean_post_subheading":"","ocean_post_title_style":"solid-color","ocean_post_title_background_color":"#00c0d6","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":[16],"class_list":["post-13521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-microcontroller-embedded-c-programming","entry","has-media"],"yoast_head":"\nStructure and bit fields | Microcontroller Embedded C<\/title>\n<meta name=\"description\" content=\"Structure and bit fields. 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