{"id":720,"date":"2021-03-25T15:32:18","date_gmt":"2021-03-25T15:32:18","guid":{"rendered":"https:\/\/imperix.com\/doc\/?p=720"},"modified":"2025-05-07T08:40:46","modified_gmt":"2025-05-07T08:40:46","slug":"multi-rate-control-with-acg-sdk-on-simulink","status":"publish","type":"post","link":"https:\/\/imperix.com\/doc\/help\/multi-rate-control-with-acg-sdk-on-simulink","title":{"rendered":"Multi-rate control on Simulink with ACG SDK"},"content":{"rendered":"\n<p>This document provides instructions on how to implement Multi-rate control on Simulink with ACG SDK. It allows running part of the control at a slower rate, without impacting the real-time control running at the base rate. This is typically useful for implementing a finite state machine or running a tracking algorithm.<\/p>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-info\" role=\"alert\">An example of use is presented in\u00a0<a href=\"https:\/\/imperix.com\/doc\/implementation\/maximum-power-point-tracking-mppt-techniques\">Maximum Power Point Tracking (MPPT) (TN117)<\/a>.<\/div>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-info\" role=\"alert\">This feature has been integrated with <strong>ACG SDK version 3.5.0.0<\/strong>, which is available from <a href=\"https:\/\/imperix.com\/downloads\">https:\/\/imperix.com\/downloads<\/a>.<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Enable MultiTasking<\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Make sure the imperix CONFIG block mode is set as <em>code generation<\/em><\/li><li>Go in the <strong>Model Configuration Parameters<\/strong> -&gt; <strong>Solver<\/strong> -&gt; <strong>Solver details<\/strong><\/li><li>Check <strong>Treat each discrete rate as a separate task <\/strong>(for older MATLAB version: for the option <strong>Tasking mode for periodic sample times<\/strong> select <em>MultiTasking<\/em>)<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"879\" height=\"693\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-106.png\" alt=\"Enable multi-tasking in the model configuration parameters\" class=\"wp-image-724\" title=\"Product notes &gt; PN145: Multi-rate control with Simulink &gt; image-20200507-133252.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-106.png 879w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-106-300x237.png 300w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-106-768x605.png 768w\" sizes=\"auto, (max-width: 879px) 100vw, 879px\" \/><figcaption>Enable multi-tasking in the model configuration parameters<\/figcaption><\/figure><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Using MultiTasking<\/h2>\n\n\n\n<p>The base rate frequency is set using the CONFIG block and defines the interrupt frequency. The resulting sample time is available through the global variable <code>CTRLPERIOD<\/code>.<\/p>\n\n\n\n<div class=\"wp-block-simple-alerts-for-gutenberg-alert-boxes sab-alert sab-alert-info\" role=\"alert\">The CPU-FPGA communication is tightly coupled to the interrupt. As such, FPGA driver blocks (CLK, ADC, PWM, GPI, GPO,\u2026) can only be called at the base rate frequency.<\/div>\n\n\n\n<p>To enable colors to display sample time do <strong>Right-click on the model<\/strong> \u2192 <strong>Sample Time Display<\/strong> \u2192 <strong>Colors<\/strong><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"531\" height=\"573\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-108.png\" alt=\"Display sample times as colors\" class=\"wp-image-729\" title=\"Product notes &gt; PN145: Multi-rate control with Simulink &gt; image-20200507-133422.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-108.png 531w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-108-278x300.png 278w\" sizes=\"auto, (max-width: 531px) 100vw, 531px\" \/><figcaption>Display sample times as colors<\/figcaption><\/figure><\/div>\n\n\n\n<p>To interface logic running at a different rate, add <strong>Rate Transition<\/strong> blocks. In the block parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>set the <strong>output port sample time<\/strong> (for instance 0.1 for a 10 Hz frequency)<\/li><li>check <strong>Ensure data integrity during data transfer<\/strong> so the generated code will use an intermediate variable (and thus avoid data corruption)<\/li><\/ul>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-109.png\" alt=\"Rate transition block to define a slower task\" class=\"wp-image-731\" width=\"512\" height=\"303\" title=\"Product notes &gt; PN145: Multi-rate control with Simulink &gt; image-20200507-133906.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-109.png 638w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-109-300x178.png 300w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\" \/><figcaption>Rate transition block to define a slower task<\/figcaption><\/figure><\/div>\n\n\n\n<p>An example of use is presented in&nbsp;<a href=\"https:\/\/imperix.com\/doc\/implementation\/maximum-power-point-tracking-mppt-techniques\">Maximum Power Point Tracking (MPPT) (TN117)<\/a>. It shows how one part of the control (in red in the figure below) can be executed at a slower rate than the main control code.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"435\" src=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-111-1024x435.png\" alt=\"Multi-rate maximum power point tracking example\" class=\"wp-image-733\" title=\"Product notes &gt; PN145: Multi-rate control with Simulink &gt; image-20200514-135836.png\" srcset=\"https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-111-1024x435.png 1024w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-111-300x127.png 300w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-111-768x326.png 768w, https:\/\/imperix.com\/doc\/wp-content\/uploads\/2021\/03\/image-111.png 1428w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><figcaption>Multi-rate MPPT example<\/figcaption><\/figure><\/div>\n","protected":false},"excerpt":{"rendered":"<p>This document provides instructions on how to implement Multi-rate control on Simulink with ACG SDK. It allows running part of the control at a slower&#8230;<\/p>\n","protected":false},"author":4,"featured_media":3014,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[13,3],"tags":[],"software-environments":[103],"provided-results":[],"related-products":[50,31,32,92,166,110],"guidedreadings":[],"tutorials":[],"user-manuals":[135],"coauthors":[70],"class_list":["post-720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-going-further-acg-sdk","category-help","software-environments-matlab","related-products-acg-sdk","related-products-b-board-pro","related-products-b-box-rcp","related-products-b-box-micro","related-products-b-box-rcp-3-0","related-products-tpi","user-manuals-going-further-with-acg-sdk"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - 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