{"id":1366,"date":"2015-11-06T14:43:00","date_gmt":"2015-11-06T12:43:00","guid":{"rendered":"http:\/\/tinusaur.org\/?p=1366"},"modified":"2022-01-01T23:03:26","modified_gmt":"2022-01-01T21:03:26","slug":"working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library","status":"publish","type":"post","link":"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/","title":{"rendered":"Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library"},"content":{"rendered":"<p>Working with the <a href=\"https:\/\/www.maximintegrated.com\/en\/products\/digital\/real-time-clocks\/DS1307.html\" target=\"_blank\" rel=\"noopener\">DS1307<\/a> Serial <a href=\"https:\/\/en.wikipedia.org\/wiki\/Real-time_clock\" target=\"_blank\" rel=\"noopener\">Real-Time Clock<\/a> using the <a href=\"\/projects\/usitwix\/\">USITWIX<\/a> library for I2C \/ TWI on Atmel <a href=\"http:\/\/www.atmel.com\/devices\/attiny85.aspx\" target=\"_blank\" rel=\"noopener\">ATtiny85<\/a> \/ Tinusaur.<\/p>\n<p>Let&#8217;s see how can we work with the <a href=\"https:\/\/www.maximintegrated.com\/en\/products\/digital\/real-time-clocks\/DS1307.html\" target=\"_blank\" rel=\"noopener\">DS1307<\/a> serial <a href=\"https:\/\/en.wikipedia.org\/wiki\/Real-time_clock\" target=\"_blank\" rel=\"noopener\">real-time clock<\/a> using the <a href=\"\/projects\/usitwix\/\">USITWIX<\/a> library for I2C \/ TWI on Atmel <a href=\"http:\/\/www.atmel.com\/devices\/attiny85.aspx\" target=\"_blank\" rel=\"noopener\">ATtiny85<\/a> \/ Tinusaur.<\/p>\n<p>Bellow is the testing setup.<\/p>\n<p>NOTE: We need the USB-to-Serial just for debugging \u2013 it isn\u2019t essential part of the setup.<\/p>\n<p><a href=\"https:\/\/tinusaur.files.wordpress.com\/2015\/11\/ds1307tiny_1_sch_c490x690fx.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1381 size-full\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307tiny_1_sch_c490x690fx-e1446812522992.png\" alt=\"DS1307 Serial Real-Time Clock USITWIX Tinusaur.\" width=\"690\" height=\"490\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307tiny_1_sch_c490x690fx-e1446812522992.png 690w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307tiny_1_sch_c490x690fx-e1446812522992-300x213.png 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307tiny_1_sch_c490x690fx-e1446812522992-270x192.png 270w\" sizes=\"(max-width: 690px) 100vw, 690px\" \/><\/a><\/p>\n<p>There is no library yet to do that but with in the testing code there are few functions that could do the job.<\/p>\n<p>Here is brief a description of\u00a0the functions:<\/p>\n<ul>\n<li>uint8_t <strong>ds1307_read_reg8<\/strong>(uint8_t reg_addr) &#8211;\u00a0reads one byte of data from the specified register.<\/li>\n<li>uint8_t <strong>ds1307_write_reg8<\/strong>(uint8_t reg_addr, uint8_t reg_data) &#8211; write one byte of data\u00a0to the specified register.<\/li>\n<li>uint8_t <strong>ds1307_init<\/strong>(void) &#8211; initializes the circuit by writing specific data into the registers.<\/li>\n<li>uint8_t <strong>ds1307_setdatetime<\/strong>(uint16_t year, uint8_t month, uint8_t date, uint8_t weekday, uint8_t hour, uint8_t min, uint8_t sec) &#8211; sets date and time.<\/li>\n<li>uint8_t <strong>ds1307_adjust<\/strong>(void) &#8211; this is helper function &#8211; it sets the date &amp; time to a specific value &#8211; let&#8217;s not forget that a brand new circuit does not have correct date and time set.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-1377 size-full\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307module_08805_a_csr236x242fx.jpg\" alt=\"DS1307 Serial Real-Time Clock Module\" width=\"236\" height=\"242\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307module_08805_a_csr236x242fx.jpg 236w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/ds1307module_08805_a_csr236x242fx-187x192.jpg 187w\" sizes=\"(max-width: 236px) 100vw, 236px\" \/>There are 2 additional functions that are used to convert data byte to and from <a href=\"https:\/\/en.wikipedia.org\/wiki\/Binary-coded_decimal\" target=\"_blank\" rel=\"noopener\">BCD<\/a> format.<\/p>\n<ul>\n<li>static uint8_t <strong>bcd2bin<\/strong> (uint8_t val)<\/li>\n<li>static uint8_t <strong>bin2bcd<\/strong> (uint8_t val)<\/li>\n<\/ul>\n<p>This is direct link to the source code of the testing program:<br \/>\n<a href=\"https:\/\/bitbucket.org\/tinusaur\/ds1307tiny\/src\/default\/ds1307tiny_test1\/main.c\" target=\"_blank\" rel=\"noopener\">https:\/\/bitbucket.org\/tinusaur\/ds1307tiny\/src\/default\/ds1307tiny_test1\/main.c<\/a><\/p>\n<p>Source code available at:\u00a0<a href=\"https:\/\/bitbucket.org\/tinusaur\/ds1307tiny\" target=\"_blank\" rel=\"noopener\">https:\/\/bitbucket.org\/tinusaur\/ds1307tiny<\/a><\/p>\n<p>More information about the library will be available at its own page:\u00a0<a href=\"\/projects\/ds1307tiny\/\">DS1307tiny<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Working with the DS1307 Serial Real-Time Clock using the USITWIX library for I2C \/ TWI on Atmel ATtiny85 \/ Tinusaur. Let&#8217;s see how can we work with the DS1307 serial real-time clock using the USITWIX library for I2C \/ TWI on Atmel ATtiny85 \/ Tinusaur. Bellow is the testing setup. NOTE: We need the USB-to-Serial &#8230; <a title=\"Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library\" class=\"read-more\" href=\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\" aria-label=\"Read more about Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library\">Read more<\/a><\/p>\n","protected":false},"author":54,"featured_media":1364,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[26,32,79,120,153,160,195,211],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library - The Tinusaur Project<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library - The Tinusaur Project\" \/>\n<meta property=\"og:description\" content=\"Working with the DS1307 Serial Real-Time Clock using the USITWIX library for I2C \/ TWI on Atmel ATtiny85 \/ Tinusaur. Let&#8217;s see how can we work with the DS1307 serial real-time clock using the USITWIX library for I2C \/ TWI on Atmel ATtiny85 \/ Tinusaur. Bellow is the testing setup. NOTE: We need the USB-to-Serial ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\" \/>\n<meta property=\"og:site_name\" content=\"The Tinusaur Project\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/tinusaur\/\" \/>\n<meta property=\"article:published_time\" content=\"2015-11-06T12:43:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2022-01-01T21:03:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/img_20150302_161400_cs1230x1230.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1230\" \/>\n\t<meta property=\"og:image:height\" content=\"1230\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Neven Boyanov\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@tinusaur\" \/>\n<meta name=\"twitter:site\" content=\"@tinusaur\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Neven Boyanov\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\"},\"author\":{\"name\":\"Neven Boyanov\",\"@id\":\"https:\/\/tinusaur.org\/#\/schema\/person\/709ec36d46e86bf5e23943565b9c7a83\"},\"headline\":\"Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library\",\"datePublished\":\"2015-11-06T12:43:00+00:00\",\"dateModified\":\"2022-01-01T21:03:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\"},\"wordCount\":314,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/tinusaur.org\/#organization\"},\"image\":{\"@id\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2015\/11\/img_20150302_161400_cs1230x1230.jpg\",\"keywords\":[\"atmel\",\"attiny85\",\"DS1307\",\"library\",\"project\",\"real-time clock\",\"tinusaur\",\"USITWIX\"],\"articleSection\":[\"Projects\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\",\"url\":\"https:\/\/tinusaur.org\/2015\/11\/06\/working-with-ds1307-real-time-clock-and-attiny85-using-usitwix-library\/\",\"name\":\"Working with DS1307 Real-time Clock and ATtiny85 using USITWIX Library - 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Let&#8217;s see how can we work with the DS1307 serial real-time clock using the USITWIX library for I2C \/ TWI on Atmel ATtiny85 \/ Tinusaur. Bellow is the testing setup. NOTE: We need the USB-to-Serial ... 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