Hi Peter, thanks for the quick reply. > The short answer is there is no portable method to setting non-standard > baud rates. Fair enough; I should've better described what I'm looking for. By "custom" I meant 10400bps, 62.5k, 5bps (very limited hardware support, but I have fallbacks in place), etc. Obviously I'd like to see as few #ifdefs as possible, and allow the largest variety of hardware to be used. I'm not looking for hard guarantees; I know how diverse UARTs can be. > That said, cfsetispeed/cfsetospeed is the generic method; you could > feature test for BXXXXXXXX macros on each platform at build time. In some cases I do use standard speeds, so I could do that. But 10400 is very important, and probably no system in existence has B10400 defined... I dream of an API that works the same on every "modern" kernel ( >=3 ?) that lets me try to set any speed (expressed as a number, not a macro!) on any serial port, and then read back the speed actually used. If it's X % off, perfect. If it's only the nearest standard or even a random number, no problem - as long as I have a way of knowing. > > 1- B38400 + ASYNC_SPD_CUST: > Don't use this method. Glad to hear that ! thanks. Can you think of any serial driver or platform that would only support that method and not #2 (BOTHER) ? I.e., any reason at all to keep the old implementation? > > - BOTHER isn't always/ever defined in <termios.h> ? > > - #include <asm/termios.h> may cause problems, > > and looks like a non-portable hack ? > > - There's a connection with "termios2" vs glibc which I'm unsure of. > BOTHER is for setting a completely custom rate (ie., not one of the > defined BXXXXXX rates). You may get varying results doing this > because there is no guarantee the uart clock can get within a > reasonable degree of error of the baud rate you want. As I mentioned that's not necessarily a problem, but I'd like to know more about the availability of BOTHER with respect to termios / termios2 / <asm/termios.h>... In particular, the fact that tty_ioctl.c needs to have "#ifdef BOTHER" , well... "bothers" me. Thanks! Chris -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
