[ECOS] Re: Does i2c module work in RedBoot?

[Grant Edwards <grante@visi.com>]

On 2007-02-12, Bart Veer <bartv@ecoscentric.com> wrote:

>    Grant> Thanks. I've heard from a couple others who also use the
>    Grant> i2c module in RedBoot.
>
>    Grant> I glanced at the souce code and noticed calls to mutex
>    Grant> routines and wasn't sure if that would cause problems or
>    Grant> not.
>
> Those calls involve the driver API rather than the kernel API,
> allowing the generic I2C code to work correctly in both a
> multi-threaded kernel configuration and in a polled-only
> configuration like RedBoot. However note that it is not just
> the generic I2C support CYGPKG_IO_I2C you need to worry about.
> Typically there will also be a hardware-specific device driver
> and that needs to do the right thing as well. Usually that is
> not hard - in the tx and rx routines check whether or not
> interrupts are enabled and then either poll or wait for the
> interrupt - but some device drivers may not bother.
>
> If instead of a driver for some I2C bus master hardware you
> are using the bitbanging support in the generic package, that
> is usable in both interrupt-driven and polled environments.

Yes, I'm planning on using the bit-banging driver (I should
have mentioned that), so it sounds like there shouldn't be any
problems.

-- 
Grant Edwards                   grante             Yow!  Now my EMOTIONAL
                                  at               RESOURCES are heavily
                               visi.com            committed to 23


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