{"id":2236,"date":"2022-05-11T18:44:30","date_gmt":"2022-05-11T18:44:30","guid":{"rendered":"https:\/\/picockpit.com\/raspberry-pi\/?p=2236"},"modified":"2023-09-18T13:53:06","modified_gmt":"2023-09-18T13:53:06","slug":"i2c-the-inter-integrated-circuit-bus","status":"publish","type":"post","link":"https:\/\/picockpit.com\/raspberry-pi\/it\/i2c-il-bus-a-circuito-intergrato\/","title":{"rendered":"I2C - Il bus del circuito integrato"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image-1024x576.png\" alt=\"Tutto su I2C Titolo immagine\" class=\"wp-image-5346\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image-1024x576.png 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image-300x169.png 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image-768x432.png 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image-18x10.png 18w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/i2c-title-image.png 1200w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Il bus I2C \u00e8 molto usato nel regno embedded. Spieghiamo come funziona e come impostarlo sul Raspberry Pi con un esempio.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Caratteristiche I2C<\/h2>\n\n\n\n<p>L'Inter-Integrated Circuit Bus \u00e8 un bus di comunicazione seriale sincrono. Philips Semiconductors fu responsabile dell'invenzione nel 1982, ma l'interfaccia guadagn\u00f2 rapidamente popolarit\u00e0.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-1024x275.jpg\" alt=\"Caratteristiche I2C\" class=\"wp-image-2247\" style=\"width:662px;height:177px\" width=\"662\" height=\"177\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-1024x275.jpg 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-300x81.jpg 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-768x207.jpg 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-1536x413.jpg 1536w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-2048x551.jpg 2048w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Characteristics-18x5.jpg 18w\" sizes=\"auto, (max-width: 662px) 100vw, 662px\" \/><figcaption class=\"wp-element-caption\">Caratteristiche I2C<\/figcaption><\/figure>\n<\/div>\n\n\n<p>I sinonimi comunemente usati sono I<sup>2<\/sup>C, I2C o IIC. L'interfaccia utilizza un'architettura Controller-Target e permette al controller di comunicare con fino a 112 dispositivi con solo due fili.<\/p>\n\n\n\n<p>Il controllore pu\u00f2 adattare la velocit\u00e0 di trasmissione alle esigenze specifiche del target. Per questo motivo I2C \u00e8 compatibile con molti dispositivi come sensori, dispositivi EEPROM, orologi, driver per motori e altro ancora.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Cablaggio<\/h2>\n\n\n\n<p>Il cablaggio del bus I2C non potrebbe essere pi\u00f9 semplice, poich\u00e9 sono necessari solo due fili. Collegare il pin di clock seriale (SCL) del controllore ai pin di clock seriale dei target e collegare anche i loro pin di dati seriali (SDA). Il software I2C far\u00e0 il resto.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-1024x414.jpg\" alt=\"Cablaggio I2C\" class=\"wp-image-2249\" style=\"width:524px;height:211px\" width=\"524\" height=\"211\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-1024x414.jpg 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-300x121.jpg 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-768x311.jpg 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-1536x622.jpg 1536w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-2048x829.jpg 2048w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Wiring-18x7.jpg 18w\" sizes=\"auto, (max-width: 524px) 100vw, 524px\" \/><figcaption class=\"wp-element-caption\">Cablaggio<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Se hai bisogno di fornire alimentazione al tuo dispositivo I2C puoi usare i pin 3V3, 5V e GROUND del tuo Raspberry Pi.<\/p>\n\n\n\n<p>Alcuni dispositivi come il nostro <a href=\"https:\/\/buyzero.de\/en\/products\/luftqualitatssensor-bosch-bme688-breakout-board?_pos=6&amp;_sid=0066ef795&amp;_ss=r\">Scheda di breakout BME688<\/a> hanno un'intestazione I2C in modo che non sia necessario alcun cavo per collegarli.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Comunicazione I2C<\/h2>\n\n\n\n<p>Il Bus a Circuito Intergrato pu\u00f2 collegare 128 dispositivi con solo due fili. Questo \u00e8 possibile grazie all'ingegnoso principio di comunicazione.<\/p>\n\n\n\n<p>I fili (SDA e SCL) non sono mai attivamente pilotati alti. Se un dispositivo vuole inviare un 1 logico, lascia il filo fluttuante. Per inviare uno zero logico, tira il filo a terra.<\/p>\n\n\n\n<p>Il controllore avvia la comunicazione. Qualsiasi dispositivo sulla rete pu\u00f2 agire come controllore e come bersaglio.<\/p>\n\n\n\n<p>Il grafico qui sotto mostra i bit indivduali.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-1024x447.jpg\" alt=\"Comunicazione I2C\" class=\"wp-image-2252\" style=\"width:549px;height:239px\" width=\"549\" height=\"239\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-1024x447.jpg 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-300x131.jpg 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-768x336.jpg 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-1536x671.jpg 1536w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-2048x895.jpg 2048w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Communication-18x8.jpg 18w\" sizes=\"auto, (max-width: 549px) 100vw, 549px\" \/><figcaption class=\"wp-element-caption\">Comunicazione I2C<\/figcaption><\/figure>\n<\/div>\n\n\n<p>Per avviare la comunicazione, il controllore invia un bit di avvio seguito dall'indirizzo I2C del target e dalla modalit\u00e0 operativa desiderata (R - Read o W - Write).<\/p>\n\n\n\n<p>Nella comunicazione I2C il target deve restituire un ACK-bit ogni 8 bit (dopo ogni byte). Poich\u00e9 lo spazio d'indirizzo \u00e8 di solito di 7 bit, ci sono 128 (da 0 a 127) indirizzi. 16 di essi sono riservati. Questo lascia 112 possibili indirizzi per i dispositivi.<\/p>\n\n\n\n<p>L'indirizzo del target e la modalit\u00e0 di funzionamento sono un byte, quindi il target deve restituire un ACK-bit. Poi il controllore invia l'indirizzo del registro (8 bit), che il target conferma di nuovo. Da l\u00ec in poi, la comunicazione di lettura e scrittura \u00e8 diversa.<\/p>\n\n\n\n<p>Per la scrittura il controllore invia semplicemente i dati in blocchi da 8 bit. Il target conferma ogni blocco. Una volta che il controllore ha finito di scrivere, invia il bit di stop.<\/p>\n\n\n\n<p>Per la lettura il controllore invia nuovamente lo Start-bit, seguito dall'indirizzo del target. Il target conferma e inizia a inviare i dati in blocchi da 8 bit. Questa volta il controllore deve confermare ogni byte. Per fermare la lettura il controllore invia il NACK-bit e infine lo Stop-bit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Vantaggi, svantaggi e applicazioni<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Vantaggi<\/h3>\n\n\n\n<p>I vantaggi del bus I2C sono abbastanza chiari. Si possono collegare 128 dispositivi con solo due fili e due pin ciascuno. Questo \u00e8 davvero potente. Inoltre si hanno velocit\u00e0 flessibili. L'impostazione dell'hardware potrebbe a malapena essere pi\u00f9 semplice. A differenza di SPI, il controller sa se il target ha ricevuto i dati correttamente.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages-1024x443.jpg\" alt=\"Vantaggi\" class=\"wp-image-2251\" style=\"width:340px;height:147px\" width=\"340\" height=\"147\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages-1024x443.jpg 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages-300x130.jpg 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages-768x333.jpg 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages-18x8.jpg 18w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Advantages.jpg 1104w\" sizes=\"auto, (max-width: 340px) 100vw, 340px\" \/><figcaption class=\"wp-element-caption\">Vantaggi<\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Svantaggi<\/h3>\n\n\n\n<p>Il bus del circuito interintegrato richiede pi\u00f9 spazio e potenza perch\u00e9 utilizza resistenze di pull-up. \u00c8 pi\u00f9 lento in confronto a SPI. Si pu\u00f2 incorrere in problemi se due dispositivi usano lo stesso indirizzo I2C. L'indirizzo \u00e8 memorizzato direttamente sul dispositivo. Alcuni dispositivi ti permettono di scegliere tra due indirizzi possibili saldando un ponticello in un punto specifico del dispositivo.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages-1024x444.jpg\" alt=\"Svantaggi\" class=\"wp-image-2250\" style=\"width:372px;height:161px\" width=\"372\" height=\"161\" srcset=\"https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages-1024x444.jpg 1024w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages-300x130.jpg 300w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages-768x333.jpg 768w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages-18x8.jpg 18w, https:\/\/picockpit.com\/raspberry-pi\/wp-content\/uploads\/2022\/05\/I2C-Disadvantages.jpg 1103w\" sizes=\"auto, (max-width: 372px) 100vw, 372px\" \/><figcaption class=\"wp-element-caption\">Svantaggi<\/figcaption><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Applicazioni<\/h3>\n\n\n\n<p>Se si cerca <a href=\"https:\/\/buyzero.de\/en\/search?type=product&amp;options%5Bprefix%5D=last&amp;options%5Bunavailable_products%5D=last&amp;q=sensor\">Sensore<\/a> nel nostro negozio noterete che quasi tutti i sensori che non sono analogici usano l'interfaccia I2C. \u00c8 molto comune nello spazio embedded. Ci sono cose come la memoria I2C. Spesso i microcontrollori usano il bus per la comunicazione. Oltre a questo, molti DAC (<strong>D<\/strong>igitale <strong>A<\/strong>nalog <strong>C<\/strong>onverter) e ADC (<strong>A<\/strong>nalog <strong>D<\/strong>igitale <strong>C<\/strong>onverter) sono compatibili con l'interfaccia.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">I2C su Raspberry Pi<\/h2>\n\n\n\n<p>Il nostro <a href=\"https:\/\/youtu.be\/GSmq8ZH01Sg\">video<\/a> mostra come impostare il bus del circuito integrato sul Raspberry Pi.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" hcb-fetch-image-from=\"https:\/\/www.youtube.com\/watch?v=GSmq8ZH01Sg\" title=\"I2C su Raspberry Pi - Come usare I2C con Python\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/GSmq8ZH01Sg?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<div class=\"shariff shariff-align-center shariff-widget-align-left shariff-buttonstretch\"><ul class=\"shariff-buttons theme-white orientation-horizontal buttonsize-medium\"><li class=\"shariff-button twitter shariff-nocustomcolor\" style=\"background-color:#595959\"><a href=\"https:\/\/twitter.com\/share?url=https%3A%2F%2Fpicockpit.com%2Fraspberry-pi%2Fit%2Fi2c-il-bus-a-circuito-intergrato%2F&text=I2C%20%E2%80%93%20The%20Inter-Integrated%20Circuit%20Bus\" title=\"Condividi su X\" aria-label=\"Condividi su X\" role=\"button\" rel=\"noopener nofollow\" class=\"shariff-link\" style=\"; 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Vi spieghiamo come funziona e come configurarlo sul Raspberry Pi con un esempio. Caratteristiche dell'I2C L'Inter-Integrated Circuit Bus \u00e8 un bus di comunicazione seriale sincrono. Philips Semiconductors \u00e8 stata responsabile dell'invenzione nel 1982, ma l'interfaccia ha rapidamente...<\/p>","protected":false},"author":3,"featured_media":5346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[196],"tags":[208,205,206,207,201,204,189,188,187],"class_list":["post-2236","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-interfaces","tag-bus","tag-i2c","tag-iic","tag-inter-integrated-circuit","tag-interface","tag-knowledge","tag-pi","tag-raspberry","tag-raspberry-pi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>I2C - The Inter-Integrated Circuit Bus | PiCockpit<\/title>\n<meta name=\"description\" content=\"The I2C bus is very commonly used in the embedded realm. We explain how it works and how to set it up on the Raspberry Pi with an example.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/picockpit.com\/raspberry-pi\/it\/i2c-il-bus-a-circuito-intergrato\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"I2C - The Inter-Integrated Circuit Bus | PiCockpit\" \/>\n<meta property=\"og:description\" content=\"The I2C bus is very commonly used in the embedded realm. 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