Le 11/5/2007, "Jan Kiszka" <[EMAIL PROTECTED]> a écrit: >Maksym Veremeyenko wrote: >> CHABAL David Ð¿Ð¸ÑÐµÑ: >> >>> I met some trouble with the 16550A driver provided in Xenomai 2.3.1 >>> and my Moxa cards (PCI / 8 * RS232 / 168U ). >>> >>> It was a problem of baudrate computation before setting the LCR_DLAB >>> register. >>> >>> The formula implemented by the Xenomai driver is different from the one >>> provided by Moxa. So I copy/paste the formula from the mxser.c file >>> (present in the >>> kernel distro), and it seems to work fine. >>> >>> I think it's Moxa card dependant, may be caused by the high default baud >>> rate of this card. >> >> I have two Moxa boards with no problem, possible you need to specify >> 'baud_base' param. >> >> I my case : >> >> # 8 ports board: >> /sbin/modprobe xeno_16550A \ >> ioaddr=0x1000,0x1008,0x1010,0x1018,0x1020,0x1028,0x1030,0x1038 \ >> irq=9,9,9,9,9,9,9,9 \ >> baud_base=921600,921600,921600,921600,921600,921600,921600,921600 >> >> # 2 ports board + onboards: >> /sbin/modprobe xeno_16550A ioaddr=0x3f8,0x2f8,0xdf00,0xdf08 >> irq=4,3,11,11 baud_base=115200,115200,921600,921600 >> > >Interesting. That would leave us just with the generic fix to catch >baud_rate==0. Far more attractive. :) > >David, can you confirm this? Weren't you just aware of the baud_base >parameter?
I'm not totally convinced because if I compute by hand the DLAB register with the 19200 value (my config): With the moxa driver: baud_div = 912.600 / 19.200 = 47 With the Xeno driver: baud_div = (912.600 - 9600) / 19.200 = 47 Grrr, it's ok here because the rounded values are the same because the baud base is biggest than the speed requested, but I think a problem can occur with 115200 or more, example: moxa: 912.600/115.200 = 8 xeno: = 7 Maksym, what is the kind of yours connections ? (PC <-> PC with the same moxa cards inside the 2 boxes, or PC <-> other device ) ? (In the 1st the case the both clocks are configured with the same value.) I find the pb by seeing the signals with an oscilloscope David > >Jan > _______________________________________________ Xenomai-core mailing list Xenomaiemail@example.com https://mail.gna.org/listinfo/xenomai-core