{"id":1154,"date":"2012-01-30T00:15:40","date_gmt":"2012-01-30T04:15:40","guid":{"rendered":"http:\/\/protofusion.org\/wordpress\/?p=1154"},"modified":"2013-04-16T16:21:01","modified_gmt":"2013-04-16T20:21:01","slug":"arduino-leonardo-interrupts","status":"publish","type":"post","link":"http:\/\/protofusion.org\/wordpress\/2012\/01\/arduino-leonardo-interrupts\/","title":{"rendered":"Arduino Leonardo &#8211; Interrupts"},"content":{"rendered":"<p><a href=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2012\/01\/m32u4.jpg\" data-rel=\"lightbox-image-0\" data-rl_title=\"\" data-rl_caption=\"\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-1158\" title=\"\" alt=\"\" src=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2012\/01\/m32u4-500x346.jpg\" width=\"500\" height=\"346\" srcset=\"http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2012\/01\/m32u4-500x346.jpg 500w, http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2012\/01\/m32u4-300x207.jpg 300w, http:\/\/protofusion.org\/wordpress\/wp-content\/uploads\/2012\/01\/m32u4.jpg 1000w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>As of Arduino 1.0, interrupts are not supported on the Arduino Leonardo. I&#8217;m working on a project using the atmega32u4 with the Arduino IDE which needs interrupt support for both software serial and frequency counting, so I investigated ways to add interrupt support for this device. I began by checking out the Leonardo pins definition file to see what was missing for interrupt support. Long story short, I ended up copying the macros for interrupt bitmasks\/registers from the Teensyduino project, which has a mega32u4 target board. In addition to modifying the pin definition header file, I also needed to modify WInterrupts.c&#8212;swapping out the default AttachInterrupt() and DetachInterrupt() funcitons with those from the\u00a0Teensyduino project.<\/p>\n<p><!--more--><\/p>\n<p>I have included links below to the pin definition header file and interrupt functions in my project repository. Place these files in the hardware\/arduino\/core and hardware\/arduino\/variants\/leonardo folders. Note that my current revision of these files <strong>only<\/strong> support the m32u4, interrupt support for other devices is broken. You can throw some #ifdefs in there and include the existing code to support devices other than the m32u4, I will hopefully get around to adding this in the coming weeks.<\/p>\n<p>I also want to get SoftwareSerial up and running on the m32u4; I&#8217;ll be looking into the Teensyduino variant of NewSoftSerial this week, check back for more updates in the coming days.<\/p>\n<p><strong>Update: The Arduino team has <a href=\"http:\/\/code.google.com\/p\/arduino\/issues\/detail?id=714\" target=\"_blank\">successfully implemented interrupts<\/a>.<\/strong><\/p>\n<h3>Downloads<\/h3>\n<ul>\n<li><a href=\"http:\/\/protofusion.org\/hg\/supermileage\/raw-file\/53311f25d424\/Arduino\/Mods\/WInterrupts.c\" target=\"_blank\">WInterrupts.c<\/a><\/li>\n<li><a href=\"http:\/\/protofusion.org\/hg\/supermileage\/raw-file\/53311f25d424\/Arduino\/Mods\/pins_arduino.h\" target=\"_blank\">pins_arduino.h<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>As of Arduino 1.0, interrupts are not supported on the Arduino Leonardo. I&#8217;m working on a project using the atmega32u4 with the Arduino IDE which needs interrupt support for both software serial and frequency counting, so I investigated ways to<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"http:\/\/protofusion.org\/wordpress\/2012\/01\/arduino-leonardo-interrupts\/\">Read more &#8250;<\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_kadence_starter_templates_imported_post":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[36,35],"tags":[253,120,121],"class_list":["post-1154","post","type-post","status-publish","format-standard","hentry","category-arduino","category-projects","tag-arduino","tag-atmega32u4","tag-leonardo"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pNjAs-iC","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/1154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/comments?post=1154"}],"version-history":[{"count":10,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/1154\/revisions"}],"predecessor-version":[{"id":1647,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/posts\/1154\/revisions\/1647"}],"wp:attachment":[{"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/media?parent=1154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/categories?post=1154"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/protofusion.org\/wordpress\/wp-json\/wp\/v2\/tags?post=1154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}