{"id":42,"date":"2009-03-02T18:17:26","date_gmt":"2009-03-02T07:17:26","guid":{"rendered":"http:\/\/blog.peter-johnson.com.au\/?p=42"},"modified":"2022-03-19T23:03:58","modified_gmt":"2022-03-19T12:03:58","slug":"tomtom-one-v3-buzzer-output","status":"publish","type":"post","link":"https:\/\/blog.peter-johnson.com.au\/index.php\/2009\/03\/02\/tomtom-one-v3-buzzer-output\/","title":{"rendered":"TomTom One V3 buzzer output"},"content":{"rendered":"<p>I was just attempting to use the \/dev\/buz device on a TomTom One V3 for debugging purposes but the test code below failed on the attempt to open the device driver despite trying a few combinations of open flags. The device seemed to be installed OK but I noticed in the Barcelona kernel source it is written for exclusive access so presumably the main ttn application opens it. I need the navigator application open while debugging my app so tomorrow will take a look at getting something out of a serial port.<\/p>\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\nint fd = open(&quot;\/dev\/buz&quot;, O_RDONLY | O_NONBLOCK | O_NOCTTY); \ncout &lt;&lt; &quot;fd: &quot; &lt;&lt; fd &lt;&lt; endl; \nint result = ioctl(_IO(&#039;U&#039;, 3), 0); \ncout &lt;&lt; &quot;result: &quot; &lt;&lt; result &lt;&lt; endl; \nsleep(10); \nclose(fd); \nexit(0);\n<\/pre><\/div>","protected":false},"excerpt":{"rendered":"<p>I was just attempting to use the \/dev\/buz device on a TomTom One V3 for debugging purposes but the test code below failed on the attempt to open the device driver despite trying a few combinations of open flags. The device seemed to be installed OK but I noticed in the Barcelona kernel source it [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,5],"tags":[],"class_list":["post-42","post","type-post","status-publish","format-standard","hentry","category-gps","category-linux"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\r\n<title>TomTom One V3 buzzer output - Peter Johnson&#039;s Blog<\/title>\r\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\r\n<link rel=\"canonical\" href=\"https:\/\/blog.peter-johnson.com.au\/index.php\/2009\/03\/02\/tomtom-one-v3-buzzer-output\/\" \/>\r\n<meta property=\"og:locale\" content=\"en_US\" \/>\r\n<meta property=\"og:type\" content=\"article\" \/>\r\n<meta property=\"og:title\" content=\"TomTom One V3 buzzer output - Peter Johnson&#039;s Blog\" \/>\r\n<meta property=\"og:description\" content=\"I was just attempting to use the \/dev\/buz device on a TomTom One V3 for debugging purposes but the test code below failed on the attempt to open the device driver despite trying a few combinations of open flags. 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