Re: [Gumstix-users] I2C_IO_SetGPIO (andI2C throughtput)

[Chris S. <chr...@gm...>]

Dave

I don't think that i2cSetSlaveAddress() is really being used for
addressing.  It is calling the I2C_SLAVE ioctl() but then I2cTransfer
sets the slave address explicitly:

msg[ 0 ].addr  =3D gI2cAddr;

What happens if I set useCrc to false?

Chris

On 5/23/06, Chris Sears <chr...@gm...> wrote:
> > > 100kHz?  I thought we were using *fast* I2C at 400kHz.  In any case,
> > > I'm completely limited by my I2C bandwidth.
> >
> > Hmmm. Yeah - I'm just using the default. I see that pxa-regs.h doesn't
> > even have a definition for bit 15 (ICR_FM or Fast Mode) in the ICR
> > register.
>
> Ok, is it enough to set ICR_FM?  I'm talking to the 7998 chip over I2C
> and also to the Robostix.  Is there any change that needs to happen in
> the Robostix i2c server program?
>
> > My approach is to use high level commands, like set speed to X, with
> > accel A, and the robostix will adjust the speed  on it's own. I'm also
> > anticipating that most of the sensor filtering will take place on the
> > robostix, with the robostix only sending significant events up to the
> > gumstix.
>
> After toasting a Robostix earlier, I've been gunshy about doing
> anything with it.  So I've just been using the i2c server to set PWMs.
>  Looking backwards, making better use of the Robostix, using the
> Connex (it was out of stock), using SPI, all would have been better.
>
> Chris
>