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debugging LED badge on pl2303 interface

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https://bbs.archlinux.org – thanks for replay and links but i need serial, not usb communication.it turns out my port settings were wrong after all.when i run it under wine, and then run my program with removed port setting (leaving parameters as they are) it works fine.so, after wine program port setting are:$ stty -a -F /dev/ttyUSB0speed 1200 baud; rows 0; columns 0; line = 0;intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q;stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V; flush = ^O; min = 0; time = 0;-parenb -parodd cs8 -hupcl (HowTos)