{"id":6821,"date":"2022-01-25T09:44:15","date_gmt":"2022-01-25T09:44:15","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=6821"},"modified":"2023-04-21T15:27:11","modified_gmt":"2023-04-21T09:57:11","slug":"fsm-lecture-15-exercise-003-drawing-state-transitions","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/fsm-lecture-15-exercise-003-drawing-state-transitions\/","title":{"rendered":"FSM Lecture 15: Exercise-003 Drawing state transitions"},"content":{"rendered":"
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Exercise-003 Drawing state transitions<\/strong><\/span><\/h1>\n
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In the previous article, we wrote some Entry and Exit actions for various states.<\/span><\/p>\n

Transitions:<\/span><\/span><\/strong><\/span><\/p>\n

The number of Transitions we draw per state depends on the number of events the state respects or processes. <\/span><\/p>\n

\"Drawing
Figure 1. Various Events<\/span><\/figcaption><\/figure>\n

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I have already shown this table(Figure 1) to you. <\/span><\/p>\n

We have got 5 Events; at maximum there could be 5 Transitions from each state because there are five events. <\/span><\/p>\n

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First, let\u2019s start with the IDLE state, and you have to check whether that state processes a particular event or not. If it doesn\u2019t process or if it doesn\u2019t respect that event, then you can ignore it. You need not define it. <\/span><\/p>\n

INC_TIME:<\/span> <\/strong><\/span>Let\u2019s start with Increment Time (INC_TIME) in the case of IDLE state. The application is in an IDLE state, whenever the increment time event is received, it should go to the TIME_SET state because the user wants to set the time. That\u2019s why the user has pressed the \u2018+\u2019 or \u2018-\u2019 button.<\/span><\/p>\n

\"Drawing
Figure 2. Transition<\/span><\/figcaption><\/figure>\n

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We will take one Transition. <\/span><\/p>\n

Go to the panel, select the Transition, and draw from wherever you want; figure 2 shows the Transition. <\/span><\/p>\n

And the trigger is the event name. i.e., INC_TIME. Currently, I don’t give any Guard for this. Whenever the ‘+’ button is pressed, it should take a transition. <\/span><\/p>\n

The Action is the user has pressed the ‘+’ button, we have to increment the time details. That’s why Action could be mobj->c_time += 60; current time has to be increased. 60 seconds I have to add to the current time variable. Because the minutes should increase whenever the ‘+’ button is pressed, that’s why I’m adding 60 to that variable. That’s the associated Action.  <\/span><\/p>\n

DEC_TIME:<\/span><\/strong><\/span> Now let\u2019s process the next event, decrement time (DEC_TIME). When the c_time=0, the decrement time has no meaning. The user cannot press the negative button when the time is 0 because we don\u2019t use negative time in this application. That\u2019s why IDLE state ignores, doesn\u2019t respect the decrement time event. You forget it.  <\/span><\/p>\n

ABORT:<\/span> <\/strong><\/span>The next event is ABORT. There is nothing to Abort because the operation has not at started. When do you use Abort? When something has started. Nothing has started in the IDLE state. That\u2019s why it doesn\u2019t respect the ABORT event also. <\/span><\/p>\n

START and PAUSE:<\/span><\/strong><\/span>  There is nothing to PAUSE, and the START doesn’t happen from here. To START something, the time has to be set first. That’s why START can only happen in other states, not in the IDLE state. That\u2019s why the IDLE state doesn\u2019t respect the START and PAUSE event. Just look at IDLE state only, don\u2019t worry about other states. I\u2019m just talking with respect to IDLE state only. <\/span><\/span><\/p>\n

TIME_TICK Event: <\/span><\/span><\/strong>We have one project requirement. The requirement says the application must beep 20 times when it returns to the IDLE mode.<\/span><\/span><\/p>\n

For every 500 milliseconds, the application has to beep. Beep for 10 milliseconds. A short beep. It has to do 20 times, and then it should go to the silent mode, I mean no more beeping. These things can be easily implemented in an Arduino framework.<\/span><\/p>\n

We will implement this as an Internal Transition in the IDLE state.<\/span><\/p>\n

\"Drawing
Figure 3.TIME_TICK Event for IDLE state<\/span><\/figcaption><\/figure>\n

 <\/p>\n

Select the IDLE mode, and go to the Internal, Trigger(set the trigger); you click on Add, the trigger is \u2018TIME_TICK.\u2019 That\u2019s a trigger. And this event has a parameter. The parameter you write inside the parenthesis. \u2018SS,\u2019 that\u2019s a trigger. <\/span><\/p>\n

Guard is e->SS==5 (for every 500 milliseconds).If SS==5 means 500 milliseconds, \u2018e\u2019 means event received. That\u2019s a TIME_TICK and its parameter SS(sub-second).<\/span><\/p>\n

Action is do_beep(); a helper function. That\u2019s an Internal Transition.<\/span><\/p>\n

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

 C<\/b>lick here: <\/span>https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n

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

  Exercise-003 Drawing state transitions     In the previous article, we wrote some Entry and Exit actions for various states. Transitions: The number of Transitions we draw per state depends on the number of events the state respects or processes.    I have already shown this table(Figure 1) to you.  We have got 5 […]<\/p>\n","protected":false},"author":1,"featured_media":6824,"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-6821","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-finite-state-machine","entry","has-media"],"yoast_head":"\nHow to draw state transitions? | FSM Exercise<\/title>\n<meta name=\"description\" content=\"Drawing state transitions. 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