{"id":3754,"date":"2020-05-25T08:35:00","date_gmt":"2020-05-25T06:35:00","guid":{"rendered":"https:\/\/www.nerdiy.de\/?p=3754"},"modified":"2020-05-25T08:46:36","modified_gmt":"2020-05-25T06:46:36","slug":"extraits-de-code-arduino-i2c-activer-la-reception-diffusion","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/fr\/extraits-de-code-arduino-i2c-activer-la-reception-diffusion\/","title":{"rendered":"Extrait de code\u00a0: Arduino - activer la r\u00e9ception de diffusion I2C"},"content":{"rendered":"<p>I2C est le protocole de bus ou la technologie via laquelle un microcontr\u00f4leur peut communiquer avec de nombreux capteurs ou actionneurs. Gr\u00e2ce au bon logiciel, vous pouvez \u00e9galement vous connecter et communiquer avec diff\u00e9rents microcontr\u00f4leurs. Il n&#039;y a g\u00e9n\u00e9ralement qu&#039;un seul ma\u00eetre par bus I2C qui peut demander des donn\u00e9es ou envoyer des donn\u00e9es \u00e0 un esclave via l&#039;adresse appropri\u00e9e.<\/p>\n<p>Dans l&#039;un de mes projets, je voulais ou je voulais connecter plusieurs microcontr\u00f4leurs entre eux. Plusieurs technologies de bus conviennent pour cela. Mais I2C est presque le seul \u00e0 \u00eatre directement pris en charge par \u00e0 peu pr\u00e8s tous les microcontr\u00f4leurs modernes sans exigences mat\u00e9rielles suppl\u00e9mentaires. Le choix s&#039;est donc rapidement port\u00e9 sur I2C.<\/p>\n<p>Plusieurs microcontr\u00f4leurs \u00e9taient ou sont maintenant connect\u00e9s les uns aux autres au moyen d&#039;I2C. Le ma\u00eetre peut facilement envoyer une commande \u00e0 chaque esclave individuel. Pour ce faire, l&#039;adresse de l&#039;esclave et la commande souhait\u00e9e sont simplement envoy\u00e9es via le bus. Tous les esclaves \u00e9coutent ce qui se passe sur le bus, mais seul l&#039;esclave avec l&#039;adresse correspondante r\u00e9agit \u00e9galement \u00e0 la commande envoy\u00e9e. Jusqu&#039;ici, tout va bien.<\/p>\n<p>Mais que se passe-t-il si le ma\u00eetre veut envoyer une commande \u00e0 tous les esclaves\u00a0? Par exemple pour lancer une commande de fa\u00e7on synchrone sur tous les esclaves ? Avec deux ou trois esclaves, chaque esclave peut \u00eatre inform\u00e9 individuellement. La vitesse de traitement est g\u00e9n\u00e9ralement si rapide que vous ne remarquez aucun \u00e9cart de temps majeur entre les ex\u00e9cutions sur les esclaves individuels. Cependant, si vous utilisez cette m\u00e9thode avec 100 esclaves, vous constaterez rapidement que le dernier esclave notifi\u00e9 d\u00e9marre bien plus tard que le premier esclave.<\/p>\n<p>La solution \u00e0 ce probl\u00e8me est l&#039;adresse de diffusion I2C. Il s&#039;agit d&#039;une adresse \u00e0 laquelle chaque esclave du bus \u00e9coute. Pour l&#039;activer, il vous suffit de d\u00e9finir un bit de contr\u00f4le. C&#039;est du moins ainsi que cela fonctionne avec les Arduinos bas\u00e9s sur les processeurs Atmel. \ud83d\ude42<\/p>\n<p>La fa\u00e7on dont vous pouvez d\u00e9finir ce bit est d\u00e9crite dans l&#039;article suivant.<\/p>\n<hr \/>\n<h2>Activer la diffusion I2C pour les esclaves I2C<\/h2>\n<p>L&#039;adresse de diffusion &quot;0&quot; est utilis\u00e9e pour que tous les participants sur le bus I2C puissent \u00eatre notifi\u00e9s en g\u00e9n\u00e9ral. Le z\u00e9ro est donc fermement d\u00e9fini comme l&#039;adresse pour les messages diffus\u00e9s et ne doit pas \u00eatre utilis\u00e9 par un autre esclave.<\/p>\n<p>Par d\u00e9faut, cependant, un microcontr\u00f4leur ne r\u00e9pond pas \u00e0 cette adresse. Celui-ci doit d&#039;abord \u00eatre activ\u00e9 en d\u00e9finissant le bit de commande correspondant. Tout ce que vous avez \u00e0 faire est d&#039;ajouter la ligne suivante \u00e0 la fonction &quot;setup()&quot; de votre code de programme.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">TWAR = (adresse &lt;&lt; 1) | 1; \/\/ active l&#039;\u00e9coute des messages diffus\u00e9s<\/pre>\n<p>Par exemple, dans une fonction d&#039;initialisation I2C compl\u00e8te, cela pourrait ressembler \u00e0 ceci<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">void init_i2c() { Wire.begin(adresse); TWAR = (adresse &lt;&lt; 1) | 1; \/\/ active l&#039;\u00e9coute des messages diffus\u00e9s Wire.onReceive(i2c_receive_event); Serial.print(F(&quot;I2C : esclave I2C initialis\u00e9 \u00e0 l&#039;adresse : &quot;)); Serial.println(adresse); }<\/pre>\n<hr \/>\n<h2>Informations g\u00e9n\u00e9rales sur I2C et les interruptions<\/h2>\n<p>Un \u00e9v\u00e9nement sur le bus I2C appelle toujours une interruption, qui interrompt le processus normal de votre microcontr\u00f4leur. L&#039;ex\u00e9cution du programme passe ainsi bri\u00e8vement du d\u00e9roulement du programme normal \u00e0 la routine d&#039;interruption. Cependant, vous devriez garder votre s\u00e9jour l\u00e0-bas aussi court que possible. Par cons\u00e9quent, il est &quot;de pratique courante&quot; de d\u00e9finir un &quot;drapeau&quot; dans la routine d&#039;interruption. Ce &quot;drapeau&quot; n&#039;est en fait qu&#039;une variable bool\u00e9enne, qui y est d\u00e9finie sur &quot;true&quot;. De retour dans le flux de programme principal de votre microcontr\u00f4leur, vous pouvez maintenant v\u00e9rifier r\u00e9guli\u00e8rement si cette variable est d\u00e9finie.<\/p>\n<p>Si c&#039;est le cas, vous pouvez maintenant lire les donn\u00e9es ou les commandes re\u00e7ues et r\u00e9agir en cons\u00e9quence.<\/p>\n<p>Au fait : vous ne devez pas utiliser de commandes &quot;Serial.print...&quot; ou similaires qui prennent du temps dans les routines d&#039;interruption.<\/p>\n<hr \/>\n<h2>Informations Compl\u00e9mentaires<\/h2>\n<p><a href=\"http:\/\/forum.arduino.cc\/index.php?topic=183699.0\"><em><strong>http:\/\/forum.arduino.cc\/index.php?topic=183699.0<\/strong><\/em><\/a><\/p>\n<p><a href=\"http:\/\/www.gammon.com.au\/i2c\"><em><strong>http:\/\/www.gammon.com.au\/i2c<\/strong><\/em><\/a><\/p>\n<p><a href=\"http:\/\/www.gammon.com.au\/forum\/?id=10896&amp;reply=1#reply1\"><em><strong>http:\/\/www.gammon.com.au\/forum\/?id=10896&amp;reply=1#reply1<\/strong><\/em><\/a><\/p>\n<hr \/>\n<h2>Amusez-vous avec le projet<\/h2>\r\n<p>J'esp\u00e8re que tout a fonctionn\u00e9 comme d\u00e9crit. Si ce n'est pas le cas ou si vous avez des questions ou des suggestions, faites-le moi savoir dans les commentaires. Je les ajouterai \u00e0 l'article si n\u00e9cessaire.<br \/>Les id\u00e9es de nouveaux projets sont toujours les bienvenues. \ud83d\ude42<\/p>\r\n<p><strong>PS Beaucoup de ces projets - en particulier les projets mat\u00e9riels - co\u00fbtent beaucoup de temps et d&#039;argent. Bien s\u00fbr, je le fais parce que j&#039;aime \u00e7a, mais si vous pensez que c&#039;est cool que je partage l&#039;information avec vous, je serais heureux d&#039;un petit don au fonds du caf\u00e9. \ud83d\ude42<\/strong><\/p>\r\n<p><a href=\"https:\/\/ko-fi.com\/nerdiy\" target=\"_blank\" rel=\"noopener\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" style=\"border: 0px; height: 36px;\" src=\"https:\/\/i0.wp.com\/cdn.ko-fi.com\/cdn\/kofi4.png?resize=143%2C36&#038;ssl=1\" alt=\"Achetez-moi un caf\u00e9 sur ko-fi.com\" width=\"143\" height=\"36\" border=\"0\" \/><\/a>\u00a0 \u00a0 \u00a0 \u00a0<input name=\"cmd\" type=\"hidden\" value=\"_s-xclick\" \/> <input name=\"hosted_button_id\" type=\"hidden\" value=\"UAZE9RMHJY7VJ\" \/> <input title=\"PayPal - Le moyen le plus s\u00fbr et le plus facile de payer en ligne !\" alt=\"Donate with PayPal button\" name=\"submit\" src=\"https:\/\/www.paypalobjects.com\/de_DE\/DE\/i\/btn\/btn_donateCC_LG.gif\" type=\"image\" \/> <img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.paypal.com\/de_DE\/i\/scr\/pixel.gif?resize=1%2C1&#038;ssl=1\" alt=\"\" width=\"1\" height=\"1\" border=\"0\" \/><\/p>","protected":false},"excerpt":{"rendered":"<p>I2C est le protocole de bus ou la technologie via laquelle un microcontr\u00f4leur peut communiquer avec de nombreux capteurs ou actionneurs. Gr\u00e2ce au bon logiciel, vous pouvez \u00e9galement connecter diff\u00e9rents microcontr\u00f4leurs entre eux et [\u2026]<\/p>","protected":false},"author":1,"featured_media":8502,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"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":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[56,66,86],"tags":[29,73,60,156],"class_list":["post-3754","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-codeschnipsel","category-elektronik","tag-arduino","tag-arduino-nano","tag-codeschnipsel","tag-i2c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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Ihr k\u00f6nnt damit also bis zu 12 Elektroden\u2026","rel":"","context":"In &quot;Abendprojekt(&lt;2h)&quot;","block_context":{"text":"Abendprojekt(&lt;2h)","link":"https:\/\/nerdiy.de\/fr\/categorie\/projet-de-soiree2h\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2020\/12\/www.nerdiy.de-howto-elektronik-mpr121-an-raspberrypi-esp32-esp8266-und-co-anschliessen-fritzing-tnihiv4t95-1.jpg?fit=962%2C752&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":617,"url":"https:\/\/nerdiy.de\/fr\/programmation-dhorloge-fibonacci\/","url_meta":{"origin":3754,"position":4},"title":"HowTo\u00a0: Horloge de Fibonacci - Programmation","author":"Fab","date":"29. May 2018","format":false,"excerpt":"In den beiden Beitr\u00e4gen FibonacciUhr - Ein ungew\u00f6hnlicher Zeitanzeiger und FibonacciUhr - Zusammenbau wurde die FibonacciUhr vorgestellt und beschrieben wie ihr eine eigene FibonacciUhr zusammenbauen k\u00f6nnt. Nachdem ihr den Zusammenbau abgeschlossen habt steht nun noch die Programmierung der Uhr an. Dies ist im folgendem Artikel beschrieben. Voraussetzungen Zur Programmierung eurer\u2026","rel":"","context":"In &quot;Abendprojekt(&lt;2h)&quot;","block_context":{"text":"Abendprojekt(&lt;2h)","link":"https:\/\/nerdiy.de\/fr\/categorie\/projet-de-soiree2h\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/05\/InkedScreenshot-152_LI.jpg?fit=1048%2C590&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":1697,"url":"https:\/\/nerdiy.de\/fr\/tasmota-ws2812-guirlande-lumineuse-a-construire-soi-meme\/","url_meta":{"origin":3754,"position":5},"title":"HowTo : Tasmota \u2013 Cha\u00eene l\u00e9g\u00e8re WS2812 \u00e0 monter soi-m\u00eame","author":"Fab","date":"27. February 2019","format":false,"excerpt":"Von dem Bau der WeltkartenLampe hatte ich noch ein paar Kunststoff-Lampengeh\u00e4use \u00fcber. Diese lagen lange einsam im Regal rum, bis ich auf die Idee kam daraus eine kleine RGB-Lichterkette mit WS2812 LED's zu bauen. Das tolle bei den WS2812B-LED's ist, dass man die Farbe und Helligkeit jeder einzelnen LED steuern\u2026","rel":"","context":"In &quot;3D-Druck&quot;","block_context":{"text":"3D-Druck","link":"https:\/\/nerdiy.de\/fr\/categorie\/impression-en-3d\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/nerdiy.de\/wp-content\/uploads\/2018\/10\/www.nerdiy.de-tasmota-ws2812-lichterkette-zum-selber-bauen-20181002-183208.jpg?fit=1200%2C900&ssl=1&resize=1050%2C600 3x"},"classes":[]}],"_links":{"self":[{"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/posts\/3754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/comments?post=3754"}],"version-history":[{"count":0,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/posts\/3754\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/media\/8502"}],"wp:attachment":[{"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/media?parent=3754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/categories?post=3754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nerdiy.de\/fr\/wp-json\/wp\/v2\/tags?post=3754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}