From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Fri, 11 May 2007 14:11:45 +0200
From: Jan Kiszka <jan.kiszka@domain.hid>
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Subject: Re: [Xenomai-core] 16550A driver and Moxa card / solved
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To: Maksym Veremeyenko <verem@domain.hid>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

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Maksym Veremeyenko wrote:
> Jan Kiszka =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
>>> moxa: 912.600/115.200 =3D 8
>>> xeno: =3D 7
>>
>> Yeah, hard arguments. This really cries for a moxa tweak. (The
>> alternative would be to pass an artificially increased baud_base - but=

>> that would be _really_ ugly and we could also ask the user for the
>> divider directly...)
>=20
> As i correctly understand mxser use formula:
>       +-
>       | base/baud, baud <> 134
> div =3D |
>       | 2*base/(2*base + 1), baud =3D=3D 134
>       +-
>=20
> Jan's driver use:
>=20
> div =3D (base + baud/2)/baud
>=20
> What is actual
>=20
> div =3D base/baud + 0.5
>=20
> That seems more correct for rounding....
>=20
>=20
> In additional:
> 1. You should use 921600 value instead of 912.600.

(921600 + (115200 div 2)) div 115200 =3D 8

So back to square #1: misconfiguration? David, please check with the
correct baud base again if you still see relevant divider variations.

> 2. Interface is asynchronous and (IMHO) data could be transfered in a
> range of frequencies (BAUD +/- RANGE%)
>=20

Jan


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