{"id":926,"date":"2014-12-01T21:05:56","date_gmt":"2014-12-01T19:05:56","guid":{"rendered":"https:\/\/tinusaur.org\/?p=926"},"modified":"2022-01-01T23:03:26","modified_gmt":"2022-01-01T21:03:26","slug":"owowod-one-wire-one-way-output-for-debugging-the-tinusaur-part-1","status":"publish","type":"post","link":"https:\/\/tinusaur.org\/2014\/12\/01\/owowod-one-wire-one-way-output-for-debugging-the-tinusaur-part-1\/","title":{"rendered":"OWOWOD &#8211; One Wire \/ One Way Output for Debugging the Tinusaur (Part 1)"},"content":{"rendered":"<p>I always wanted to be able to write something like this in my code<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\"> debugging_print(&amp;quot;working, x=%i&amp;quot;, x); <\/pre>\n<p>&#8230; have that running on the <a title=\"Microcontroller -  small computer on a single integrated circuit\" href=\"http:\/\/en.wikipedia.org\/wiki\/Microcontroller\" target=\"_blank\" rel=\"noopener\">micro-controller<\/a> and see the <strong>debugging output<\/strong> on my computer.<\/p>\n<h1>The Problem<\/h1>\n<p>Unfortunately that is not easy &#8211; in fact not possible with the standard tools used to\u00a0work\u00a0with the <a title=\"ATtiny85 - high-performance, low-power Atmel 8-bit AVR RISC-based microcontroller\" href=\"http:\/\/www.atmel.com\/devices\/ATTINY85.aspx\" target=\"_blank\" rel=\"noopener\">ATtiny85<\/a>. The problem is this: (1) those micro-controllers have\u00a0<strong>too few I\/O ports<\/strong>; and (2) most of the programmers\u00a0(the one I&#8217;m using is <a title=\"USBasp - USB programmer for Atmel AVR controllers\" href=\"http:\/\/www.fischl.de\/usbasp\/\" target=\"_blank\" rel=\"noopener\">USBasp<\/a>) do not offer that kind of communication between the micro-controller and the computer, i.e. there is <strong>no 2-way communication<\/strong>.<\/p>\n<p>There are many solutions to that problem and while looking on Internet I found this article <a title=\"Serial communication with the Tiny's\" href=\"http:\/\/www.ernstc.dk\/arduino\/tinycom.html\" target=\"_blank\" rel=\"noopener\">http:\/\/www.ernstc.dk\/arduino\/tinycom.html<\/a>\u00a0that points to some of them:<\/p>\n<ul>\n<li>TinyDebugSerial:\u00a0<a title=\"arduino-tiny source browse cores TinyDebugSerial\" href=\"https:\/\/code.google.com\/p\/arduino-tiny\/source\/browse\/cores\/tiny\/\" target=\"_blank\" rel=\"noopener\">https:\/\/code.google.com\/p\/arduino-tiny\/source\/browse\/cores\/tiny\/<\/a><\/li>\n<li>Lightweight Serial Output:\u00a0<a title=\"Writing AVR assembler code with the Arduino IDE\" href=\"http:\/\/nerdralph.blogspot.ca\/2013\/12\/writing-avr-assembler-code-with-arduino.html\" target=\"_blank\" rel=\"noopener\">http:\/\/nerdralph.blogspot.ca\/2013\/12\/writing-avr-assembler-code-with-arduino.html<\/a><\/li>\n<li>TinySoftwareUSART:\u00a0<a title=\"How establish communication between Attiny and Arduino One\" href=\"http:\/\/forum.arduino.cc\/index.php?topic=255250.0\" target=\"_blank\" rel=\"noopener\">http:\/\/forum.arduino.cc\/index.php?topic=255250.0<\/a><\/li>\n<\/ul>\n<p>Since the purpose of <a title=\"About\" href=\"\/about\/\">The Tinusaur Project<\/a> is <strong>learning<\/strong> I decided to write my own.<\/p>\n<figure id=\"attachment_938\" aria-describedby=\"caption-attachment-938\" style=\"width: 290px\" class=\"wp-caption alignright\"><a href=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_usb2serttl_15_cs600x460fx2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-938\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_usb2serttl_15_cs600x460fx2.jpg?w=300\" alt=\"USB to Serial TTL\" width=\"300\" height=\"230\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_usb2serttl_15_cs600x460fx2.jpg 600w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_usb2serttl_15_cs600x460fx2-300x230.jpg 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_usb2serttl_15_cs600x460fx2-250x192.jpg 250w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><figcaption id=\"caption-attachment-938\" class=\"wp-caption-text\">USB to Serial TTL Converter<\/figcaption><\/figure>\n<p>To do that I needed:<\/p>\n<ul>\n<li><a title=\"Tinusaur Board\" href=\"\/products\/tinusaur-board\/\">Tinusaur Board<\/a>.<\/li>\n<li><a title=\"USBasp - USB programmer for Atmel AVR controllers\" href=\"http:\/\/www.fischl.de\/usbasp\/\" target=\"_blank\" rel=\"noopener\">USBasp programmer<\/a> &#8211; to load the program to the board.<\/li>\n<li><a title=\"USB to Serial TTL Converter on eBay\" href=\"http:\/\/www.ebay.com\/sch\/i.html?_nkw=USB+TTL\" target=\"_blank\" rel=\"noopener\">USB to\u00a0Serial TTL converter<\/a> &#8211; to transfer\u00a0the debugging output from the ATtiny micro-controller to the computer.<br \/>\n(mine&#8217;s based on\u00a0Prolific PL2303, not the best choice by the way)<\/li>\n<\/ul>\n<p>The USB-to-Serial TTL is a device that when connected to the USB port of the computer will look to the operating system like a <a title=\"Serial COM Port\" href=\"http:\/\/en.wikipedia.org\/wiki\/Serial_port\" target=\"_blank\" rel=\"noopener\">Serial COM Port<\/a>. Writing data to that COM port will result in transferring that data through the converter and out to the output pin\u00a0called TxD &#8211; in serial form.\u00a0It work similarly when receiving data from an external source of signal connected to the RxD pin.<\/p>\n<p>I connected the <strong>PB0<\/strong> of the ATtiny85 to the <strong>RxD<\/strong> of the USB-to-Serial TTL\u00a0and did some experiments.\u00a0Soon I realized that the timing of the signals was\u00a0critical for this to work and I needed better way to compose the serial data.<\/p>\n<h1>Reference Character Generator<\/h1>\n<p>First thing &#8211; a serial data character generator that I can use as reference &#8211; and what could be better than an original USB-to-Serial converter.<\/p>\n<p>I also needed a software that will <strong>generate sequence of test characters<\/strong> that I would use as a test signal. First I though of writing a simple Java program that will send the data to the COM port but then I found an application on Internet that does that already &#8211;\u00a0<a title=\"COM Stress Test\" href=\"http:\/\/www.aggsoft.com\/com-port-stress-test.htm\" target=\"_blank\" rel=\"noopener\">COMStressTest<\/a> from\u00a0<a title=\"AGG Software\" href=\"http:\/\/www.aggsoft.com\/\" target=\"_blank\" rel=\"noopener\">AGG Software<\/a> at\u00a0<a title=\"COM PORT STRESS TEST - ALLOWS TO TEST YOUR COM AND RS232 PORT PERFORMANCE AND STABILITY\" href=\"http:\/\/www.aggsoft.com\/com-port-stress-test.htm\" target=\"_blank\" rel=\"noopener\">http:\/\/www.aggsoft.com\/com-port-stress-test.htm<\/a>.<\/p>\n<p><a href=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_comstresstest_01.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-944 size-full\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_comstresstest_01.png\" alt=\"COM Stress Test\" width=\"556\" height=\"509\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_comstresstest_01.png 556w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_comstresstest_01-300x275.png 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_comstresstest_01-210x192.png 210w\" sizes=\"(max-width: 556px) 100vw, 556px\" \/><\/a><\/p>\n<p>I specified my testing data in the &#8220;Data source&#8221; tab as an external file.<\/p>\n<p>The best testing sequence\u00a0in this case would be\u00a0string of\u00a0<strong>&#8220;U&#8221; characters<\/strong>. This is because the generated signal will\u00a0consist of equal LOW and HI intervals known also as square wave signal.<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\"> ASCII &amp;quot;U&amp;quot; = 0x55 = 01010101 <\/pre>\n<p>To look more precisely at the signal form and parameters I used an <strong>oscilloscope<\/strong> &#8211; mine is <a title=\"DSO Quad wiki\" href=\"http:\/\/www.seeedstudio.com\/wiki\/DSO_Quad\" target=\"_blank\" rel=\"noopener\">DSO Quad<\/a> from <a title=\"Electronic modules for makers to DIY projects - Seeedstudio\" href=\"http:\/\/www.seeedstudio.com\/\" target=\"_blank\" rel=\"noopener\">Seeedstudio<\/a>\u00a0at\u00a0<a title=\"DSO Quad - 4 Channel Digital Storage Oscilloscope\" href=\"http:\/\/www.seeedstudio.com\/depot\/DSO-Quad-4-Channel-Digital-Storage-Oscilloscope-p-736.html\" target=\"_blank\" rel=\"noopener\">http:\/\/www.seeedstudio.com\/depot\/DSO-Quad-4-Channel-Digital-Storage-Oscilloscope-p-736.html<\/a>.<\/p>\n<p>The signal should look like this &#8230;<\/p>\n<p><a href=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_oscilloscopeserialsignal_08_cs600x450fx.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-942 size-full\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_oscilloscopeserialsignal_08_cs600x450fx.jpg\" alt=\"Oscilloscope Serial Signal\" width=\"600\" height=\"450\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_oscilloscopeserialsignal_08_cs600x450fx.jpg 600w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_oscilloscopeserialsignal_08_cs600x450fx-300x225.jpg 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2014\/12\/20141201_oscilloscopeserialsignal_08_cs600x450fx-256x192.jpg 256w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>That&#8217;s all for now.<\/p>\n<p>The next step will be to write some code for the ATtiny that will generate the same sequence &#8211; all &#8220;U&#8221; character and try to make it exactly the same as the reference one.<\/p>\n<p style=\"padding-left:30px\"><span style=\"text-decoration:underline\"><strong>IMPORTANT<\/strong><\/span>: All the tests were done with the default settings for the serial COM port which are 9600 bps, 8 bits of data, no parity check and 1 stop bit. This is sometimes denoted as 9600 \/ 8-N-1 configuration.<\/p>\n<p style=\"padding-left:30px\"><span style=\"text-decoration:underline\"><strong>NEXT PART<\/strong><\/span>: <a title=\"OWOWOD \u2013 One Wire \/ One Way Output for Debugging the Tinusaur (Part 2)\" href=\"\/2014\/12\/06\/owowod-one-wire-one-way-output-for-debugging-the-tinusaur-part-2\/\">OWOWOD \u2013 One Wire \/ One Way Output for Debugging the Tinusaur (Part 2)<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>All the <a title=\"OWOWOD\" href=\"\/projects\/owowod\/\">OWOWOD<\/a>\u00a0<strong>source code<\/strong> is available at\u00a0<a title=\"OWOWOD - One Wire \/ One Way Output for Debugging - Source Code\" href=\"https:\/\/bitbucket.org\/tinusaur\/owowod\/src\" target=\"_blank\" rel=\"noopener\">https:\/\/bitbucket.org\/tinusaur\/owowod\/src<\/a>.<\/p>\n<p><span style=\"line-height:1.5\">\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>I always wanted to be able to write something like this in my code debugging_print(&amp;quot;working, x=%i&amp;quot;, x); &#8230; have that running on the micro-controller and see the debugging output on my computer. The Problem Unfortunately that is not easy &#8211; in fact not possible with the standard tools used to\u00a0work\u00a0with the ATtiny85. The problem is &#8230; <a title=\"OWOWOD &#8211; One Wire \/ One Way Output for Debugging the Tinusaur (Part 1)\" class=\"read-more\" href=\"https:\/\/tinusaur.org\/2014\/12\/01\/owowod-one-wire-one-way-output-for-debugging-the-tinusaur-part-1\/\" aria-label=\"Read more about OWOWOD &#8211; One Wire \/ One Way Output for Debugging the Tinusaur (Part 1)\">Read more<\/a><\/p>\n","protected":false},"author":54,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[32,69,70,129,138,141,153,170,195,200,209],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OWOWOD - One Wire \/ One Way Output for Debugging the Tinusaur (Part 1) - 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\/2014\/12\/01\/owowod-one-wire-one-way-output-for-debugging-the-tinusaur-part-1\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"OWOWOD - One Wire \/ One Way Output for Debugging the Tinusaur (Part 1) - The Tinusaur Project\" \/>\n<meta property=\"og:description\" content=\"I always wanted to be able to write something like this in my code debugging_print(&amp;quot;working, x=%i&amp;quot;, x); &#8230; have that running on the micro-controller and see the debugging output on my computer. The Problem Unfortunately that is not easy &#8211; in fact not possible with the standard tools used to\u00a0work\u00a0with the ATtiny85. The problem is ... 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The Problem Unfortunately that is not easy &#8211; in fact not possible with the standard tools used to\u00a0work\u00a0with the ATtiny85. The problem is ... 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