I am working on an embedded project at the moment that prints debug messages to a serial console. ?Interestingly, it seems that some of the prints are arriving out order from the actual flow of the software when they originate from the same thread.<\/p>\n
To debug the printing problem and to add another, better layer, of debugging to the project I added a time stamp to a preprocessor definition for the existing printf() macro.<\/p>\n
Here is the existing print macro:<\/p>\n
In your program you need to make sure sys\/timeb.h is added and then use the new print macro.<\/p>\n Enjoy!<\/p>\n","protected":false},"excerpt":{"rendered":" I am working on an embedded project at the moment that prints debug messages to a serial console. ?Interestingly, it seems that some of the prints are arriving out order from the actual flow of the software when they originate from the same thread.<\/p>\n To debug the printing problem and to add another, better layer, of debugging to the project I added a time stamp to a preprocessor definition for the existing printf() macro.<\/p>\n Here is the existing print macro:<\/p>\n #define debug_print(fmt, arg) printf (fmt, arg) To add a time stamp we need to use the timeb struct from sys\/timeb.h. Since a struct is used, we need to give it …<\/p>\n [Continue reading]<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[3,1],"tags":[],"_links":{"self":[{"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/posts\/86"}],"collection":[{"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/comments?post=86"}],"version-history":[{"count":6,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/posts\/86\/revisions"}],"predecessor-version":[{"id":146,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/posts\/86\/revisions\/146"}],"wp:attachment":[{"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/media?parent=86"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/categories?post=86"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/11h.net\/blog\/wp-json\/wp\/v2\/tags?post=86"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}#define debug_print(fmt, arg) printf (fmt, arg)<\/code>
\nTo add a time stamp we need to use the timeb struct from sys\/timeb.h. Since a struct is used, we need to give it a focus. Otherwise we?ll get compile errors. It will need to be put in a false do while loop.<\/p>\n#define debug_print(fmt, arg) \\
\ndo { \\
\nstruct timeb tp; \\
\nftime(&tp); \\
\nprintf(\"%ld.%d: \" fmt, tp.time, tp.millitm, arg); \\
\n} while (0)<\/code><\/p>\n#include <stdio.h>
\n#include <sys\/timeb.h>
\n#define debug_print(fmt, arg) \\
\ndo { \\
\nstruct timeb tp; \\
\nftime(&tp); \\
\nprintf(\"%ld.%d: \" fmt, tp.time, tp.millitm, arg); \\
\n} while (0)<\/code><\/p>\nint main() {
\nwhile(1) {
\ndebug_print(\"This is dbg print and a number: %d\\n\", 10);
\nusleep(10000);
\n}
\nreturn 0;
\n}<\/code><\/p>\n