{"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":"fragmentos-de-codigo-arduino-i2c-habilitar-transmision-recepcion-2","status":"publish","type":"post","link":"https:\/\/nerdiy.de\/es\/fragmentos-de-codigo-arduino-i2c-habilitar-transmision-recepcion-2\/","title":{"rendered":"Fragmento de c\u00f3digo: Arduino: habilite la recepci\u00f3n de transmisi\u00f3n I2C"},"content":{"rendered":"

I2C es el protocolo o tecnolog\u00eda de bus a trav\u00e9s del cual un microcontrolador puede comunicarse con muchos sensores o actuadores. Gracias al software adecuado, tambi\u00e9n es posible conectar diferentes microcontroladores entre s\u00ed y comunicarse. Por lo general, solo hay un maestro por bus I2C que puede solicitar o enviar datos a un esclavo a trav\u00e9s de la direcci\u00f3n correspondiente.<\/p>\n

En uno de mis proyectos quer\u00eda o quiero conectar varios microcontroladores entre s\u00ed. Para ello son adecuadas varias tecnolog\u00edas de autobuses. Sin embargo, I2C es casi el \u00fanico que es compatible directamente con casi todos los microcontroladores modernos sin requisitos de hardware adicionales. As\u00ed que la elecci\u00f3n se centr\u00f3 r\u00e1pidamente en I2C.<\/p>\n

Mediante I2C se conectaron o se conectan varios microcontroladores entre s\u00ed. El maestro puede enviar f\u00e1cilmente un comando a cada esclavo individual. Para hacer esto, simplemente env\u00ede la direcci\u00f3n del esclavo y el comando deseado a trav\u00e9s del bus. Todos los esclavos escuchan lo que sucede en el bus, pero s\u00f3lo el esclavo con la direcci\u00f3n correspondiente responde al comando enviado. Hasta ahora, todo bien.<\/p>\n

Pero \u00bfqu\u00e9 pasa si el amo quiere enviar una orden a todos los esclavos? \u00bfPor ejemplo, iniciar un comando de forma sincr\u00f3nica en todos los esclavos? Si hay dos o tres esclavos, a\u00fan puedes informar a cada esclavo individualmente. La velocidad de procesamiento suele ser tan r\u00e1pida que no se nota una gran diferencia de tiempo entre las ejecuciones de los esclavos individuales. Sin embargo, si utiliza este procedimiento con 100 esclavos, notar\u00e1 r\u00e1pidamente que el \u00faltimo esclavo notificado comienza significativamente m\u00e1s tarde que el primer esclavo.<\/p>\n

La soluci\u00f3n a este problema es la direcci\u00f3n de transmisi\u00f3n I2C. Esta es una direcci\u00f3n que escuchan todos los esclavos del autob\u00fas. Para activar esto s\u00f3lo tienes que configurar un bit de control. Al menos as\u00ed funciona con Arduinos basados en procesadores Atmel. \ud83d\ude42<\/p>\n

En el siguiente art\u00edculo se describe c\u00f3mo configurar este bit.<\/p>\n

\n

Habilite la transmisi\u00f3n I2C para esclavos I2C<\/h2>\n

Damit alle Teilnehmer auf dem I2C-Bus pauschal benachrichtigt werden k\u00f6nnen, gibt es die Broadcast-Adresse „0“. Die Null ist also fest definiert als die Adresse f\u00fcr Broadcast-Nachrichten und sollte auch von keinem anderen Slave genutzt werden.<\/p>\n

Standardm\u00e4\u00dfig reagiert ein Mikrocontroller aber nicht auf diese Adresse. Dies muss erst aktiviert werden indem Ihr das entsprechende Kontroll-Bit setzt. Dazu m\u00fcsst Ihr lediglich folgende Zeile in die „setup()“ Funktion Eures Programmcodes einf\u00fcgen.<\/p>\n

TWAR = (direcci\u00f3n << 1) | 1; \/\/ habilitar la escucha en mensajes de difusi\u00f3n<\/pre>\n
Por ejemplo, en una funci\u00f3n de inicializaci\u00f3n I2C completa podr\u00eda verse as\u00ed<\/p>\n
void init_i2c() { Wire.begin(direcci\u00f3n); TWAR = (direcci\u00f3n << 1) | 1; \/\/ habilitar la escucha en mensajes de difusi\u00f3n Wire.onReceive(i2c_receive_event); Serial.print(F("I2C: esclavo I2C inicializado en la direcci\u00f3n: ")); Serial.println(direcci\u00f3n); }<\/pre>\n
\n
Informaci\u00f3n general sobre I2C e interrupciones<\/h2>\n
Ein Ereignis auf dem I2C-Bus ruft immer einen Interrupt auf, welcher den regul\u00e4ren Ablauf Eures Mikrocontrollers unterbricht. Die Programmausf\u00fchrung h\u00fcpft also kurz aus dem Ablauf des regul\u00e4ren Programms in die Interrupt-Routine. Den Aufenthalt darin solltet Ihr aber so kurz wie m\u00f6glich halten. Deswegen ist es „g\u00e4ngige Praxis“ innerhalb der Interrupt-Routine eine „Flag“ zu setzen. Diese „Flag“ ist eigentlich nur eine Boolsche Variable, welche dort auf „true“ gesetzt wird. Zur\u00fcck in dem Haupt-Programmablauf Eures Mikrocontrollers k\u00f6nnt Ihr nun regelm\u00e4\u00dfig pr\u00fcfen ob diese Variable gesetzt ist.<\/p>\n
Si es as\u00ed, ahora puede leer los datos o comandos recibidos y reaccionar en consecuencia.<\/p>\n
\u00dcbrigens: Ihr solltet innerhalb der Interrupt-Routinen auch keine „Serial.print…“ oder \u00e4hnliche Zeit-fressenden Befehle nutzen.<\/p>\n
\n
Informaci\u00f3n adicional<\/h2>\n
http:\/\/forum.arduino.cc\/index.php?topic=183699.0<\/strong><\/em><\/a><\/p>\n
http:\/\/www.gammon.com.au\/i2c<\/strong><\/em><\/a><\/p>\n
http:\/\/www.gammon.com.au\/forum\/?id=10896&reply=1#reply1<\/strong><\/em><\/a><\/p>\n
\n
Divi\u00e9rtete con el proyecto.<\/h2>\r\n
Espero que todo te haya funcionado como se describe. Si no es as\u00ed, o si tiene alguna pregunta o sugerencia, h\u00e1gamelo saber en los comentarios. Si es necesario, lo a\u00f1adir\u00e9 al art\u00edculo.
Las ideas para nuevos proyectos siempre son bienvenidas. \ud83d\ude42<\/p>\r\n
PS Muchos de estos proyectos, especialmente los proyectos de hardware, cuestan mucho tiempo y dinero. Por supuesto que hago esto porque lo disfruto, pero si crees que es genial que comparta la informaci\u00f3n contigo, me encantar\u00eda hacer una peque\u00f1a donaci\u00f3n al fondo del caf\u00e9. \ud83d\ude42<\/strong><\/p>\r\n
\"C\u00f3mprame<\/a>\u00a0 \u00a0 \u00a0 \u00a0   \"\"<\/p>","protected":false},"excerpt":{"rendered":"
I2C es el protocolo o tecnolog\u00eda de bus a trav\u00e9s del cual un microcontrolador puede comunicarse con muchos sensores o actuadores. Gracias al software adecuado, tambi\u00e9n puede conectar diferentes microcontroladores entre s\u00ed y [\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":"\nCodeschnipsel: Arduino - 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Voraussetzungen Zur Programmierung eurer\u2026","rel":"","context":"In "Abendprojekt(<2h)"","block_context":{"text":"Abendprojekt(<2h)","link":"https:\/\/nerdiy.de\/es\/categoria\/proyecto-vespertino2h\/"},"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\/es\/tasmota-ws2812-cadena-ligera-para-construir-usted-mismo\/","url_meta":{"origin":3754,"position":5},"title":"HowTo: Tasmota \u2013 Cadena ligera WS2812 para construir usted mismo","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 "3D-Druck"","block_context":{"text":"3D-Druck","link":"https:\/\/nerdiy.de\/es\/categoria\/impresion-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\/es\/wp-json\/wp\/v2\/posts\/3754","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/comments?post=3754"}],"version-history":[{"count":0,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/posts\/3754\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/media\/8502"}],"wp:attachment":[{"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/media?parent=3754"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/categories?post=3754"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nerdiy.de\/es\/wp-json\/wp\/v2\/tags?post=3754"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}