{"id":7186,"date":"2022-02-07T08:52:30","date_gmt":"2022-02-07T08:52:30","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=7186"},"modified":"2023-08-08T16:12:54","modified_gmt":"2023-08-08T10:42:54","slug":"exercise-003-dispatching-time-tick-event","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/exercise-003-dispatching-time-tick-event\/","title":{"rendered":"FSM Lecture 28- Exercise-003 Dispatching time tick event"},"content":{"rendered":"
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Exercise-003 Dispatching time tick event<\/strong><\/span><\/h1>\n
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In the previous article<\/a>, we implemented the code to dispatch the user event. <\/span><\/span><\/p>\n

Let\u2019s write a small code to dispatch the time tick event. For that, we will use the <\/span>millis()<\/b> function provided by the Arduino framework.<\/span><\/span><\/p>\n

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millis()<\/b><\/span><\/p>\n

It returns the number of milliseconds passed since the Arduino board began running the current program. This number will overflow(go back to 0), after approximately 50 days. Because its datatype is unsigned long, the width is 4 bytes. <\/span><\/p>\n

Syntax<\/span><\/span>: <\/span>time=millis()<\/span><\/span><\/p>\n

\"Figure
Figure 1. Example code<\/span><\/figcaption><\/figure>\n

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Here, they have used <\/span>millis()<\/b>. And in this code statement: <\/span>myTime = millis()<\/b>, they are storing the current time into the <\/span>myTime<\/b> variable. The current time is not the clock time; it is the number of milliseconds passed since the Arduino board began running the program. That means a number of milliseconds passed before executing this statement. So, that value is stored in <\/span>myTime<\/b>, and we will use millis() function. <\/span><\/span><\/p>\n

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In our project, the fourth task is, ‘Dispatch the time tick event for every 100 milliseconds’. Because that\u2019s what we decided to do, our state machine receives the time tick event for every 100 milliseconds.<\/span><\/p>\n

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Figure 2. Loop function<\/span><\/figcaption><\/figure>\n

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I will create one local static variable in the loop function. <\/span>current_time \u2013<\/b> this is to store the current time; This returns the saved current time. Its data type is uint32_t, and initially, I will store the current time using the <\/span>millis()<\/b> functions.  Since it is a static variable, the first time when the control reaches this loop, only one time this variable will be initialized to the current_time. That is, in terms of the number of milliseconds. <\/span><\/span><\/p>\n

\/\/4. dispatch the time tick event for every 100ms<\/span>\r\nif<\/span>(millis() - current_time >= 100){\r\n  \/\/100ms has passed<\/span>\r\n  current_time = millis();\r\n  te.super.sig = TIME_TICK;\r\n  if<\/span>(++te.ss > 10) te.ss = 1;\r\n  protimer_event_dispatcher(&protimer,&te.super);\r\n}<\/pre>\n
Dispatch the Time tick event function code<\/span><\/p>\n
After that, I will write one small logic. if(millis() – current_time >= 100). This <\/span>millis()<\/b> function is the actual running current_time, minus the saved current_time. If this difference is equal to or grows bigger than 100 milliseconds, that means 100 milliseconds has passed.<\/span><\/span><\/p>\n
In that case, what should we do? We should first reset this current_time because, for the next event generation, we have to reset this with millis(). I\u2019m just resetting this variable with the current time. Because, current_time = millis() code in loop function will not execute for every loop, so because it\u2019s a static variable. That\u2019s why I am again initializing it. <\/span><\/p>\n
\"Exercise-003
Figure 2. Loop function<\/span><\/figcaption><\/figure>\n
 <\/p>\n
Let\u2019s create one variable. Protimer_tick_event t te = {.ss = 0}; The \u2018ss\u2019 field, that is = 0. Because we have to use the sub-second field. <\/span><\/p>\n
Then, we have to make an event te.super.sig = TIME_TICK; ++te.ss; Whenever 100 milliseconds have passed, we have to increment this. Its value varies from 1 to 10. That’s why, if te.ss grows bigger than 10, then we have to reset te.ss to 1. Or you can do if(++te.ss > 10) te.ss = 1). That means ‘te’ has to be the static variable because it can’t be a local variable. Otherwise, for every loop, this will be initialized to 0. When it becomes 11, it resets to 1.  After that, we have to call the event_dipatcher te.super. That\u2019s about dispatching the time tick event to the state machine.<\/span><\/p>\n
And you can also do this using a timer interrupt for every 100 milliseconds, you can generate a timer interrupt, and you can also do that.<\/span><\/p>\n
In the upcoming article, let\u2019s understand the button bouncing<\/a><\/span>, and we will try to implement this. <\/span><\/p>\n
 <\/p>\n
FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n
Click here: <\/span>https:\/\/fastbitlab.com\/course1 <\/span><\/a><\/span><\/p>\n
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  Exercise-003 Dispatching time tick event     In the previous article, we implemented the code to dispatch the user event. Let\u2019s write a small code to dispatch the time tick event. For that, we will use the millis() function provided by the Arduino framework.   millis() It returns the number of milliseconds passed since […]<\/p>\n","protected":false},"author":1,"featured_media":7189,"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":[17],"class_list":["post-7186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-finite-state-machine","entry","has-media"],"yoast_head":"\nFSM Lecture 28- Exercise-003 Dispatching time tick event<\/title>\n<meta name=\"description\" content=\"Exercise-003 Dispatching time tick event. 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