{"id":6857,"date":"2022-01-27T01:00:49","date_gmt":"2022-01-27T01:00:49","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=6857"},"modified":"2023-04-21T15:36:48","modified_gmt":"2023-04-21T10:06:48","slug":"exercise-003-implementing-time_set-state","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/exercise-003-implementing-time_set-state\/","title":{"rendered":"FSM Lecture 16: Exercise-003 Implementing TIME_SET state"},"content":{"rendered":"
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Exercise-003 Implementing TIME_SET state<\/span><\/h1>\n
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 <\/p>\n<\/div>\n<\/div>\n<\/div>\n

In this article, let\u2019s process all the events for TIME_SET state. <\/span><\/p>\n

The application is in TIME_SET state, and the Increment time event is received. Increment time means you have to increment the time\u2014the c_time variable. <\/span><\/p>\n

\"Figure
Figure 1. INC_TIME event for TIME_SET state<\/span><\/figcaption><\/figure>\n

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Now the increment time should happen inside the TIME_SET state (Figure 1).<\/span><\/p>\n

This is a state which takes care of setting the time. That\u2019s why it cannot transition; it should take care inside of it.<\/span><\/p>\n

Hence, increment time and decrement time will be Internal Transition for this state. It cannot ask someone else to do increment time or decrement time. It\u2019s the TIME_SET state\u2019s responsibility.<\/span><\/p>\n

Select TIME_SET state and go to Internal; the trigger is <\/span>INC_TIME<\/b>. Action is the same as previous. And there is one more action: <\/span>mobj->c_time+=60<\/b>; it should show the incremented time on the display. <\/span><\/span><\/p>\n

So, disp_time (mobj->c_time). Whenever increment time is received, it just does + to c_time and then displays the modified time. That\u2019s it. <\/span><\/span><\/p>\n

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\"FSM-:
Figure 2.DEC_TIME Event for TIME_SET state<\/span><\/figcaption><\/figure>\n

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Let\u2019s process the decrement time. The decrement time is also an Internal Transition. Let me add one more Internal Transition <\/span>DEC_TIME<\/b>.<\/span><\/span><\/p>\n

Action is: You have to do \u2018-\u2019 here. <\/span>mobj->c_time-=60<\/b>; you modified the time, so display the time, mobj->c_time. That\u2019s it, as you can see in Figure 2.<\/span><\/span><\/p>\n

Guard is <\/span>mobj->c_time >=60<\/b>.The current time should be greater than or at least = 60. That\u2019s a Guard. This is a Boolean expression; a Boolean expression will be FALSE if c_time is less than 60. <\/span><\/span><\/p>\n

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Please note that you can only increment or decrement the minutes, not the seconds, using increment time and decrement time. So, this has no effects on the seconds.<\/span><\/p>\n<\/blockquote>\n

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\"FSM-
Figure 3. ABRT event<\/span><\/figcaption><\/figure>\n

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The next event is ABORT.<\/span><\/p>\n

When there is an ABORT event, it just comes back to the IDLE state. I mean, no guard, no action, nothing, just ABRT. <\/span><\/p>\n

When the ABORT event is received, it comes to the IDLE state, but the TIME_SET state has displayed something. That needs to be cleared. That\u2019s why you can give one Exit action. <\/span><\/p>\n

Exit action is a disp_clr(). And when it comes to the IDLE mode, it sets everything to 0, and displays 0 and sends the message \u201cSet time.\u201d<\/span><\/p>\n

 <\/p>\n

\"FSM
Figure 4. START_PAUSE event<\/span><\/figcaption><\/figure>\n

 <\/p>\n

The next event is START_PAUSE. <\/span><\/p>\n

Now you have done the time settings, so now the user presses the START\/PAUSE button, so the COUNTDOWN has to be started. And that happens in the COUNTDOWN state. That\u2019s why now there will be one transition from TIME_SET state to the COUNTDOWN state (Figure 4). The trigger is START_PAUSE.<\/span><\/p>\n

Guard is mobj->c_time>=60, the COUNTDOWN cannot begin if minutes is 0.That\u2019s why a Guard would be mobj->c_time should be greater than or = 60. That\u2019s a Guard for this transition to happen. If this condition is not TRUE, then this transition cannot happen. That\u2019s our START_PAUSE event. <\/span><\/p>\n

 <\/p>\n

The next event is the TIME_TICK event. <\/span><\/p>\n

When the application is in TIME_SET state, it doesn\u2019t process the TIME_TICK event. I mean, there is no action that is synchronous with the time. Because TIME_SET nearly does modification to the time variable as per the \u2018+\u2019 or \u2018\u2013\u2019 button pressed by the user. It has no time-based action defined. That\u2019s why let\u2019s ignore that event in this state.<\/span><\/p>\n

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

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

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

  Exercise-003 Implementing TIME_SET state     In this article, let\u2019s process all the events for TIME_SET state. The application is in TIME_SET state, and the Increment time event is received. Increment time means you have to increment the time\u2014the c_time variable.    Now the increment time should happen inside the TIME_SET state (Figure 1). […]<\/p>\n","protected":false},"author":1,"featured_media":6859,"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-6857","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-finite-state-machine","entry","has-media"],"yoast_head":"\nExercise: TIME_SET state Implementation | FSM<\/title>\n<meta name=\"description\" content=\"TIME_SET state. 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