What hardware are you using?<div> Karl Wilbur <a href="mailto:karl@karlwilbur.net">karl@karlwilbur.net</a> <div class="gmail_quote">On Tue, Aug 31, 2010 at 3:35 PM, Martin McCormick <<a href="mailto:martin@x.it.okstate.edu">martin@x.it.okstate.edu</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"> I am writing some C code to manage the operation of a new scanner radio and it is mostly coming along well but I have run in to some odd behavior from a RS-232 port routine I stole from a Linux HowTo on serial communications. One calls the routine and it stores characters in to a buffer or transmits data from a buffer. Receiving 50 or 60 characters is a piece of cake. Everything works as expected but receiving a longer string such as 60 to 70 or more characters, the first read brings back some of the chars from the previous read even though the buffer was zero'd out. A second read gets all the character that should have been there in the first read. Needless to say, this is not good but I discovered I can put a 1-second sleep before the next read and then it always gives the correct data. When I get through, the radio will be totally accessible thanks to its serial control capabilities and to Linux, in this case, Vinux. Are there any Linux discussion groups that would be really good for this question? The receiver control program really creeps along with those forced 1-second pauses before every serial read. Interestingly enough, I wouldn't call it flaky because it does exactly the same wrong thing every time and it is always on a longer receive string. The buffer is set for 1024 characters and none of the reads have even come close to overflowing it so that's not the problem. Also, if the sleep is even slightly less than 1 full second, such as .75 seconds, I still get the bogus read. Again, any ideas as to where to take this question are appreciated. Martin _______________________________________________ Blinux-list mailing list <a href="mailto:Blinux-list@redhat.com">Blinux-list@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/blinux-list" target="_blank">https://www.redhat.com/mailman/listinfo/blinux-list</a> </blockquote></div> </div>