Dear Marek Vasut, In message <201311301642.36531.ma...@denx.de> you wrote: > Dear Vladimir Zapolskiy, > > > For LPC32XX high-speed UART it is required to send a carriage return > > symbol along with line feed. > > Why ?
Because we are actually emulating a classical type writer here, and to start printing at the beginning of a new line requires two separate actions: performing a line feed (i. e. scrolling the paper one line up) and a crriage return (i. e. repositioning the drum such that the next character will be printed in column 1. In the strict sense, the ASCII characters represent the line feed and '\r' the carriage return, respectively. To print the equivalent of the "new line" as it is interpreted by the C standard, we have to translate the single C character into a two-character sequence. You can trace this back to the very beginnings of Unix; you can see the same in Unix version 6 drivers, for example. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de A well-written program is its own heaven; a poorly-written program is its own hell. -- Geoffrey James, "The Tao of Programming" _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
