{"id":716,"date":"2018-11-19T10:12:53","date_gmt":"2018-11-19T09:12:53","guid":{"rendered":"http:\/\/www.embedded-communication.com\/?p=716"},"modified":"2018-11-19T13:19:49","modified_gmt":"2018-11-19T12:19:49","slug":"debug-printf","status":"publish","type":"post","link":"http:\/\/www.embedded-communication.com\/en\/misc\/debug-printf\/","title":{"rendered":"debug printf"},"content":{"rendered":"<p><\/p>\n<h2 class=\"western\" lang=\"zxx\">Debug printf<\/h2>\n<p lang=\"zxx\">Typical the Debug printf() delivered with gcc is used<br \/>\nin this way on e2Studio an Synergy.<!--more--><\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-723\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_22eba9849fb36bcb.png\" alt=\"\" width=\"667\" height=\"309\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_22eba9849fb36bcb.png 667w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_22eba9849fb36bcb-300x139.png 300w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p lang=\"zxx\">&#8211;specs=rdimon.specs<\/p>\n<p lang=\"zxx\">create an environment, where a breakpoint is called,<br \/>\nthe program stop and the gdb read the buffered messaged to print it<br \/>\nin a console.<\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-727\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_b301b9d5af1bc6d0.png\" alt=\"\" width=\"357\" height=\"204\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_b301b9d5af1bc6d0.png 357w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_b301b9d5af1bc6d0-300x171.png 300w\" sizes=\"auto, (max-width: 357px) 85vw, 357px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>This debug environment is easy to create in your application. You have<br \/>\nonly to initialize the stdio handles:<\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-726 aligncenter\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_54a7192c89eee070.png\" alt=\"\" width=\"480\" height=\"129\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_54a7192c89eee070.png 480w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_54a7192c89eee070-300x81.png 300w\" sizes=\"auto, (max-width: 480px) 85vw, 480px\" \/><\/p>\n<pre lang=\"zxx\">extern void initialise_monitor_handles(void);\r\n\r\ninitialise_monitor_handles();<\/pre>\n<p lang=\"zxx\">That&#8217;s all and works with many debug interfaces.<\/p>\n<p lang=\"zxx\">But the problem is, that the program breaks and interrupts and timing is corrupted.<\/p>\n<h2 lang=\"zxx\">printf() using ITM<\/h2>\n<p lang=\"zxx\">We use the S7G2 SK starterkit. This board uses an onboard\u00a0 JLink interface.<\/p>\n<p lang=\"zxx\">This interface support the simple Trace mechanismn over\u00a0 the SWD interface. Channel 0 is used for ASCII output and supported by the NVIC directly.<\/p>\n<p lang=\"zxx\">Add to your program the low level _write function to<br \/>\noutput the characters to the ITM port.<\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-725 aligncenter\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_44f68e615a1b94ec.png\" alt=\"\" width=\"348\" height=\"153\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_44f68e615a1b94ec.png 348w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_44f68e615a1b94ec-300x132.png 300w\" sizes=\"auto, (max-width: 348px) 85vw, 348px\" \/><br \/>\n<br clear=\"left\" \/><\/p>\n<pre lang=\"zxx\" style=\"border: 1px solid #000000; padding: 0.05cm; page-break-inside: avoid; page-break-before: auto;\">\/* printf without syscall *\/\r\nint _write(int file, char *ptr, int len)\r\n{\r\n    int DataIdx;\r\n    for (DataIdx = 0; DataIdx &lt; len; DataIdx++)\r\n    {\r\n        ITM_SendChar(*ptr++);\r\n    }\r\n    return len;\r\n}<\/pre>\n<p lang=\"zxx\">The output is only generated, it the trace port is open. Without them this output is ignored. You can get a problem (program stop at this point), if you switch the Trace port of the debugger during a session.\u00a0 If you want to see the output you need a Trace console. The Eclipse edition used with the default Synergy installation do not have it as a normal console. You have to use the Live Trace Console.<\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-large wp-image-730\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_f3d053a254ac0dee-1024x507.png\" alt=\"\" width=\"840\" height=\"416\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_f3d053a254ac0dee-1024x507.png 1024w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_f3d053a254ac0dee-300x148.png 300w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_f3d053a254ac0dee-768x380.png 768w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_f3d053a254ac0dee.png 1035w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><br \/>\n<br clear=\"left\" \/><\/p>\n<p lang=\"zxx\">At the first you have to configure the SWO clock, that<br \/>\nis used for the Serieal Wire View (SWV). The maximum is cpu clock\/2. Reduce it in case of trace problems.<\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-729 aligncenter\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_e4050df0ee8d4c45.png\" alt=\"\" width=\"416\" height=\"293\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_e4050df0ee8d4c45.png 416w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_e4050df0ee8d4c45-300x211.png 300w\" sizes=\"auto, (max-width: 416px) 85vw, 416px\" \/><\/p>\n<p lang=\"zxx\">You need to configure the Trace port 0.<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-728 alignright\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_d5c4d59c498431f2.png\" alt=\"\" width=\"142\" height=\"49\" \/><br \/>\n<br clear=\"left\" \/><\/p>\n<p lang=\"zxx\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-724\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_41e905364647a508.png\" alt=\"\" width=\"883\" height=\"376\" srcset=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_41e905364647a508.png 883w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_41e905364647a508-300x128.png 300w, http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_41e905364647a508-768x327.png 768w\" sizes=\"auto, (max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 1362px) 62vw, 840px\" \/><br \/>\n<br clear=\"left\" \/><\/p>\n<p lang=\"zxx\">Now you can activate it and see the output in the console.<img loading=\"lazy\" decoding=\"async\" class=\"wp-image-722 size-full alignright\" src=\"http:\/\/www.embedded-communication.com\/wp-content\/uploads\/2018\/11\/printf_using_itm_html_7e4a85848bb5c9c2.png\" alt=\"\" width=\"194\" height=\"117\" \/><\/p>\n<p lang=\"zxx\">If you configured a wrong CPU clock in the Debugger you loose characters.<\/p>\n<p lang=\"zxx\">Also with this setting you activate the general trace mechanism. This create capture data, too.\u00a0 The printf() using the ITM port works almost without interaction to the application.<\/p>\n<p lang=\"zxx\">Note: The Debugger seems not activate the ITM port automatically, if active. In this case you need to Deactivate\/Activate it on the Live Trace console.<\/p>\n<p lang=\"zxx\">We often include these debug prints into our <a href=\"https:\/\/www.can-cia.org\">CANopen<\/a> example projects to signal some events, such as SDO read access, received <a href=\"http:\/\/www.embedded-communication.com\/canopen\/canopen-emergency-nachrichten\/\">Emergency<\/a> messages or new NMT states or other information.<\/p>\n<p lang=\"zxx\">\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Debug printf Typical the Debug printf() delivered with gcc is used in this way on e2Studio an Synergy.<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[39,38,42,41,37,43],"class_list":["post-716","post","type-post","status-publish","format-standard","hentry","category-misc","tag-debug","tag-debugging","tag-e2studio","tag-itm","tag-printf","tag-swd"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.0 - 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