Date: Sat, 09 Dec 2006 10:56:34 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: ticso@cicely.de, ticso@cicely12.cicely.de Cc: freebsd-arm@freebsd.org Subject: Re: questions about current RM9200 state Message-ID: <20061209.105634.1690385738.imp@bsdimp.com> In-Reply-To: <20061209114124.GB54209@cicely12.cicely.de> References: <20061208114906.GJ54209@cicely12.cicely.de> <20061208.223200.-1303464500.imp@bsdimp.com> <20061209114124.GB54209@cicely12.cicely.de>
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In message: <20061209114124.GB54209@cicely12.cicely.de>
Bernd Walter <ticso@cicely12.cicely.de> writes:
: On Fri, Dec 08, 2006 at 10:32:00PM -0700, M. Warner Losh wrote:
: > In message: <20061208114906.GJ54209@cicely12.cicely.de>
: > Bernd Walter <ticso@cicely12.cicely.de> writes:
: > : On Fri, Dec 08, 2006 at 11:42:28AM +0100, Bernd Walter wrote:
: > : > On Thu, Dec 07, 2006 at 08:50:08PM -0700, M. Warner Losh wrote:
: > : > > In message: <20061208015032.GF54209@cicely12.cicely.de>
: > : > > Bernd Walter <ticso@cicely12.cicely.de> writes:
: > : > > : But I can't probe the bus from userland:
: > : > > : [56]arm9# ./iic_probe /dev/iic0
: > : > > : - and nothing listed.
: > : > >
: > : > > twi doesn't support START/STOP ioctls that you use. Hmmm, that's in
: > : > > p4 that I've removed them because I never got that working. I also
: > : > > think the version in -head isn't the latest, working one. I think you
: > : > > do the same thing with a 0 byte transfer. Except we don't detect
: > : > > NOACK quite right yet, I'm afraid. I'd expect an error each time you
: > : > > tried.
: > : >
: > : > Ah - Ok, will switch to 0 Byte transfers and retest.
: > :
: > : iic.c:
: > : case I2CWRITE:
: > : if (s->count <= 0) {
: > : error = EINVAL;
: > : break;
: > : }
: > :
: > : Well - it wouldn't work without NOACK detection anyway.
: >
: > I think a zero-byte transfer would do it.
:
: Unfortunately the TWI controller can't do zero transfers at all :(
: I thought the RM9200 has different one, but it is the same ^$%@ as in
: the AT91SAM7 series, which I already had some hard time with.
: The TWI controller in the AVR series is much better IMHO.
: I'll send you a diff later today to fix some small bugs that I've found
: in the driver - those points aren't documented very well in the
: handbook.
BTW, I have a AVR32 eval board...
Warner
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