{"id":7948,"date":"2022-03-01T04:15:14","date_gmt":"2022-03-01T04:15:14","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=7948"},"modified":"2023-10-12T10:25:02","modified_gmt":"2023-10-12T04:55:02","slug":"fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/","title":{"rendered":"FSM Lecture 55- QHSM_INIT() and QHSM_DISPATCH() APIs"},"content":{"rendered":"
\n
\n
\n
\n

 <\/p>\n<\/div>\n

\n

QHSM_INIT() and QHSM_DISPATCH() APIs<\/strong><\/span><\/h1>\n
\n
\n

 <\/p>\n

<\/div>\n

 <\/p>\n<\/div>\n<\/div>\n

In this article, let’s explore the QHSM_INIT() and QHSM_DISPATCH() APIs.<\/span><\/p>\n

\"Figure
Figure 1. QHSM_INIT API reference<\/span><\/figcaption><\/figure>\n

Polymorphically executes the top-most initial transition in the state machine. You have initialized the state variable with the initial state handler in the previous step, and now you have to execute the top-most initial transition in the SM. You have to call the QHSM_INIT function with a ‘me’ pointer. You can see the example in Figure 1. That is the pointer to the Superclass. This must be called once after the SM “constructor.”<\/span><\/p>\n

#include<\/span> <Arduino.h>\r\n#include<\/span> \"qpn.h\"\r\n#include<\/span> \"QHSM_Test.h\"\r\nQ_DEFINE_THIS_FILE;<\/span>\r\n\r\nvoid<\/span> setup() {\r\n  \/\/ put your setup code here, to run once:<\/span>\r\n  QHsmTst_ctor();<\/span>\r\n  QHSM_INIT(super_QHsmTst);<\/span>\r\n}<\/pre>\n
QHSM_INIT function<\/span><\/p>\n
After the QHsmTst_ctor(), write <\/span>QHSM_INIT<\/b>. You already have a QHsmTst pointer to the superclass. Just use that <\/span>super_QHsmTst<\/b>. <\/span><\/span><\/p>\n
You have to define QHSM_INIT(super_QHsmTst)  macro. So, Q_DEFINE_THIS_FILE. Use this macro in the main.cpp, which defines the Q_this_module_variable. Which nothing but it’s an array that stores the file’s name (a module name); it stores the module name.<\/span><\/p>\n
 <\/p>\n
Now, we have to collect the events and dispatch it using QHSM_DISPATCH.<\/span><\/p>\n
\"FSM
Figure 2. QHSM_DISPATCH API reference<\/span><\/figcaption><\/figure>\n
QHSM_DISPATCH dispatches the event to the dispatcher of the framework, and the framework then calls the appropriate state handler, and that’s how event execution happens. <\/span><\/p>\n
It processes one event at a time in Run-to-Completion fashion(RTC fashion). Just provide the ‘me’ pointer, which is the QHSM superclass’s pointer.<\/span><\/p>\n
void<\/span> loop() {\r\n  \/\/ put your main code here, to run repeatedly:<\/span>\r\n  char<\/span> ue;\r\n  if<\/span>(Serial.available() > 0){\r\n    ue = Serial.read();\r\n    if<\/span>(ue == 'a' || ue == 'A'){\r\n       Q_SIG(super_QHsmTst) = (QSignal)A_SIG;\r\n    }\r\n    else if<\/span> (ue == 'b' || ue == 'B') Q_SIG(super_QHsmTst) = (QSignal)B_SIG;\r\n    else if<\/span> (ue == 'c' || ue == 'C') Q_SIG(super_QHsmTst) = (QSignal)C_SIG;\r\n    else if<\/span> (ue == 'd' || ue == 'D') Q_SIG(super_QHsmTst) = (QSignal)D_SIG;\r\n    else if<\/span> (ue == 'e' || ue == 'E') Q_SIG(super_QHsmTst) = (QSignal)E_SIG;\r\n    else if<\/span> (ue == 'f' || ue == 'F') Q_SIG(super_QHsmTst) = (QSignal)F_SIG;\r\n    else if<\/span> (ue == 'g' || ue == 'G') Q_SIG(super_QHsmTst) = (QSignal)G_SIG;\r\n    else if<\/span> (ue == 'h' || ue == 'H') Q_SIG(super_QHsmTst) = (QSignal)H_SIG;\r\n    else if<\/span> (ue == 'i' || ue == 'I') Q_SIG(super_QHsmTst) = (QSignal)I_SIG;\r\n    else if<\/span> (ue == 'x' || ue == 'X') Q_SIG(super_QHsmTst) = (QSignal)TERMINATE_SIG;\r\n    else<\/span> Q_SIG(super_QHsmTst) = IGNORE_SIG;\r\n  }<\/pre>\n
Q_SIG function<\/span><\/p>\n
Here, let’s take the events. Let me take the events from the serial port. The events are from ‘A’ to ‘I.’ <\/span><\/p>\n
Let’s take one variable, <\/span>char<\/b> ue<\/b>. [ue\u2192 user event].<\/span><\/span><\/p>\n
Let me just write this code  <\/span>Serial.available()<\/b>. If the data is available at the Serial Port,  <\/span>Serial.available>0<\/b>.<\/span><\/span><\/p>\n
ue = Serial.read();<\/b> \u2192 user event, let’s read the serial port 1 byte. <\/span><\/span><\/p>\n
And <\/span>if(ue == ‘a’ || ue == ‘A’)<\/b>, then we have to dispatch the event. The event name is <\/span>A_SIG<\/b>. <\/span><\/span><\/p>\n
super_QHsmTst-> evt.sig = (QSignal)A_SIG; \u2192 <\/b>Here take the <\/span>super_QHsmTst<\/b> pointer and dereference that, <\/span>evt.sig = A_SIG<\/b>, its type is <\/span>QSignal<\/b> just typecast that. Like that. Super_QHsmTst pointer itself holds the signal. <\/span><\/span><\/p>\n
 <\/p>\n
Instead of writing <\/span>super_QHsmTst-> evt.sig = (QSignal)A_SIG<\/b>, you can just do something like this <\/span>Q_SIG(super_QHsmTst) = (QSignal)A_SIG;<\/b>  You can just use the macro Q_SIG of the HSM pointer super_QHsmTst. That you can find in ‘qepn.h’. <\/span><\/span><\/p>\n
else if (ue == \u2018b\u2019 || ue == \u2018B\u2019)Q_SIG(super_QHsmTst) = (QSignal)B_SIG; <\/b> Like that you have to write up to I. ‘A’ to ‘I’. Like this, you have to add different events, as per the user event to the superclass pointer.<\/span><\/span><\/p>\n
And if the user entered character is other than these values, you can invent one an event called IGNORE_SIG.<\/span> <\/span><\/p>\n
You can add that IGNORE_SIG, as shown in Figure 3.<\/span><\/p>\n
\"FSM
Figure 3. Adding IGNORE_SIG<\/span><\/figcaption><\/figure>\n
 <\/p>\n
After that, in the end, you use the function <\/span>QHSM_DISPATCH<\/b>. And you just use <\/span>super_QHsmTst<\/b> pointer. After that, print the new line character here to push the next message to the new line, as shown below. And add it to the setup function as well. <\/span><\/span><\/p>\n
   QHSM_DISPATCH(super_QHsmTst);\r\n   Serial.print('\\n');\r\n}<\/pre>\n
QHSM_DISPATCH function<\/span><\/p>\n
 <\/p>\n
Get the Full course on Embedded System Design using UML State Machines<\/strong> Here<\/a><\/span><\/span><\/p>\n
FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n
Click here:<\/span> <\/span><\/span>https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n
 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
  QHSM_INIT() and QHSM_DISPATCH() APIs     In this article, let’s explore the QHSM_INIT() and QHSM_DISPATCH() APIs. Polymorphically executes the top-most initial transition in the state machine. You have initialized the state variable with the initial state handler in the previous step, and now you have to execute the top-most initial transition in the SM. […]<\/p>\n","protected":false},"author":1,"featured_media":7951,"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-7948","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-finite-state-machine","entry","has-media"],"yoast_head":"\nFSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs<\/title>\n<meta name=\"description\" content=\"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs\" \/>\n<meta property=\"og:description\" content=\"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/\" \/>\n<meta property=\"og:site_name\" content=\"FastBit EBA\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/fastbiteba\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-03-01T04:15:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-12T04:55:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1741\" \/>\n\t<meta property=\"og:image:height\" content=\"983\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"FastBitLab\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@fastbiteba\" \/>\n<meta name=\"twitter:site\" content=\"@fastbiteba\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"FastBitLab\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/\"},\"author\":{\"name\":\"FastBitLab\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#\\\/schema\\\/person\\\/e32b38e733a0d76ffa7e6bc998652e5d\"},\"headline\":\"FSM Lecture 55- QHSM_INIT() and QHSM_DISPATCH() APIs\",\"datePublished\":\"2022-03-01T04:15:14+00:00\",\"dateModified\":\"2023-10-12T04:55:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/\"},\"wordCount\":610,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/02\\\/figure-1-3.png\",\"keywords\":[\"Finite state Machine(FSM)\"],\"articleSection\":[\"Blog\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/\",\"url\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/\",\"name\":\"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/02\\\/figure-1-3.png\",\"datePublished\":\"2022-03-01T04:15:14+00:00\",\"dateModified\":\"2023-10-12T04:55:02+00:00\",\"description\":\"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#primaryimage\",\"url\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/02\\\/figure-1-3.png\",\"contentUrl\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2022\\\/02\\\/figure-1-3.png\",\"width\":1741,\"height\":983,\"caption\":\"Figure 1.QHSM_INIT API reference\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"FSM Lecture 55- QHSM_INIT() and QHSM_DISPATCH() APIs\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/\",\"name\":\"FastBit EBA\",\"description\":\"Your Online Academy of Embedded Systems\",\"publisher\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#organization\",\"name\":\"FastBit EBA\",\"url\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/logo-EzNrEnyr.png\",\"contentUrl\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/logo-EzNrEnyr.png\",\"width\":640,\"height\":640,\"caption\":\"FastBit EBA\"},\"image\":{\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/fastbiteba\\\/\",\"https:\\\/\\\/x.com\\\/fastbiteba\",\"https:\\\/\\\/www.linkedin.com\\\/in\\\/fastbit-embedded-brain-academy-b3167b124\\\/\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UCa1REBV9hyrzGp2mjJCagBg\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/fastbitlab.com\\\/blog\\\/#\\\/schema\\\/person\\\/e32b38e733a0d76ffa7e6bc998652e5d\",\"name\":\"FastBitLab\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g\",\"caption\":\"FastBitLab\"},\"description\":\"The FastBit Embedded Brain Academy uses the power of internet to bring the online courses related to the field of embedded system programming, Real time operating system, Embedded Linux systems, etc at your finger tip with very low cost. Backed with strong experience of industry, we have produced lots of courses with the customer enrolment over 3000+ across 100+ countries.\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs","description":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/","og_locale":"en_US","og_type":"article","og_title":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs","og_description":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()","og_url":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/","og_site_name":"FastBit EBA","article_publisher":"https:\/\/www.facebook.com\/fastbiteba\/","article_published_time":"2022-03-01T04:15:14+00:00","article_modified_time":"2023-10-12T04:55:02+00:00","og_image":[{"width":1741,"height":983,"url":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png","type":"image\/png"}],"author":"FastBitLab","twitter_card":"summary_large_image","twitter_creator":"@fastbiteba","twitter_site":"@fastbiteba","twitter_misc":{"Written by":"FastBitLab","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#article","isPartOf":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/"},"author":{"name":"FastBitLab","@id":"https:\/\/fastbitlab.com\/blog\/#\/schema\/person\/e32b38e733a0d76ffa7e6bc998652e5d"},"headline":"FSM Lecture 55- QHSM_INIT() and QHSM_DISPATCH() APIs","datePublished":"2022-03-01T04:15:14+00:00","dateModified":"2023-10-12T04:55:02+00:00","mainEntityOfPage":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/"},"wordCount":610,"commentCount":0,"publisher":{"@id":"https:\/\/fastbitlab.com\/blog\/#organization"},"image":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#primaryimage"},"thumbnailUrl":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png","keywords":["Finite state Machine(FSM)"],"articleSection":["Blog"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/","url":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/","name":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs","isPartOf":{"@id":"https:\/\/fastbitlab.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#primaryimage"},"image":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#primaryimage"},"thumbnailUrl":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png","datePublished":"2022-03-01T04:15:14+00:00","dateModified":"2023-10-12T04:55:02+00:00","description":"FSM Event Handling: QHSM_INIT() and QHSM_DISPATCH() APIs. Unlock the power of event-driven programming using QHSM_INIT() and QHSM_DISPATCH()","breadcrumb":{"@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#primaryimage","url":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png","contentUrl":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2022\/02\/figure-1-3.png","width":1741,"height":983,"caption":"Figure 1.QHSM_INIT API reference"},{"@type":"BreadcrumbList","@id":"https:\/\/fastbitlab.com\/blog\/fsm-event-handling-qhsm_init-and-qhsm_dispatch-apis\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/fastbitlab.com\/blog\/"},{"@type":"ListItem","position":2,"name":"FSM Lecture 55- QHSM_INIT() and QHSM_DISPATCH() APIs"}]},{"@type":"WebSite","@id":"https:\/\/fastbitlab.com\/blog\/#website","url":"https:\/\/fastbitlab.com\/blog\/","name":"FastBit EBA","description":"Your Online Academy of Embedded Systems","publisher":{"@id":"https:\/\/fastbitlab.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/fastbitlab.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/fastbitlab.com\/blog\/#organization","name":"FastBit EBA","url":"https:\/\/fastbitlab.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/fastbitlab.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2026\/04\/logo-EzNrEnyr.png","contentUrl":"https:\/\/fastbitlab.com\/blog\/wp-content\/uploads\/2026\/04\/logo-EzNrEnyr.png","width":640,"height":640,"caption":"FastBit EBA"},"image":{"@id":"https:\/\/fastbitlab.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/fastbiteba\/","https:\/\/x.com\/fastbiteba","https:\/\/www.linkedin.com\/in\/fastbit-embedded-brain-academy-b3167b124\/","https:\/\/www.youtube.com\/channel\/UCa1REBV9hyrzGp2mjJCagBg"]},{"@type":"Person","@id":"https:\/\/fastbitlab.com\/blog\/#\/schema\/person\/e32b38e733a0d76ffa7e6bc998652e5d","name":"FastBitLab","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/9230d0f9bdef28b63a01e7ca274ee7b2e8ed9abe932ee564af8809caaf52a0c8?s=96&d=mm&r=g","caption":"FastBitLab"},"description":"The FastBit Embedded Brain Academy uses the power of internet to bring the online courses related to the field of embedded system programming, Real time operating system, Embedded Linux systems, etc at your finger tip with very low cost. Backed with strong experience of industry, we have produced lots of courses with the customer enrolment over 3000+ across 100+ countries."}]}},"_links":{"self":[{"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/posts\/7948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/comments?post=7948"}],"version-history":[{"count":5,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/posts\/7948\/revisions"}],"predecessor-version":[{"id":16117,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/posts\/7948\/revisions\/16117"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/media\/7951"}],"wp:attachment":[{"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/media?parent=7948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/categories?post=7948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fastbitlab.com\/blog\/wp-json\/wp\/v2\/tags?post=7948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}