[GSOC] GPIO status and I2C start

[Alan Cudmore]

On Mon, Jul 7, 2014 at 9:42 AM, Gedare Bloom <gedare at rtems.org> wrote:

> On Mon, Jul 7, 2014 at 9:37 AM, Alan Cudmore <alan.cudmore at gmail.com>
> wrote:
> > Hi André,
> > I updated my Pi setup to add the second LED and switch, and your example
> > works for me. I did notice that when I power off the Rapberry Pi, then
> power
> > it back on, the second LED will remain lit and cause interrupts in the
> RTEMS
> > program. If I leave the Pi powered off for a little while, it works as
> > intended. I don't think this is an RTEMS problem. The good news is that
> the
> > RTEMS app continues to run and handle the interrupts, so it is stable.
> >
> > I will experiment with different button and LED combinations in the next
> few
> > days.
> >
> > When you have an I2C driver to try, I have a number of I2C devices to
> > interface. I will have to find an SPI device to try out. Something like
> > this:
> > https://www.adafruit.com/product/1897
> > Or
> > https://www.adafruit.com/product/1900
> >
> > A question about the examples ( maybe not for Andre ):
> > Can we keep Board/BSP specific tests in the testsuites/samples directory?
> >
> We do not currently have a good location for BSP-specific tests in the
> RTEMS tree. However, we now have a way to specify in a BSP which tests
> it does not work for (test config file), so we could use that
> filtering mechanism to enforce BSP-specific tests. The question then
> is where to put those tests/examples so it is obvious to a user
> whether the code should work for them or not.
>
> -Gedare
>
>
We probably don't want to keep the examples in the RTEMS tree, since they
are so specific to the Raspberry Pi and the peripherals that we connect to
it. I think it will be good enough for the project to end up with a github
repository that has the code to exercise the various I/O interfaces.

Alan



> > Alan
> >
> >
> > On Sat, Jul 5, 2014 at 6:58 PM, Andre Marques
> > <andre.lousa.marques at gmail.com> wrote:
> >>
> >> Hello,
> >>
> >> The Raspberry Pi GPIO interrupts are already working, and a test case is
> >> available to test that [1]. A function is also provided to debounce a
> switch
> >> if needed. The test case requires two switches and two LEDS using the
> same
> >> setup described at [2] by only changing the pin numbers.
> >>
> >> The test works by setting interrupts on both edges of the switches,
> which
> >> handlers will turn on or off the corresponding LED. One of the LEDs
> also has
> >> a level interrupt which prints a message on the screen when the LED is
> on
> >> (high level).
> >>
> >> While I wait for some feedback on that, I will be looking at the next
> >> step: the I2C interface. To test both the I2C and the SPI interfaces I
> have
> >> here a simple display [3]. The idea is to create a low level driver for
> I2C
> >> to provide the needed directives for the libi2c API, so the driver for
> the
> >> display will actually use the libi2c API. Any thoughts here are welcome
> too!
> >>
> >> Thanks,
> >> André Marques.
> >>
> >> [1] -
> >>
> https://github.com/asuol/rtems/blob/GPIO_API/testsuites/samples/LIBGPIO_TEST_IQR/init.c
> >> [2] -
> http://asuolgsoc2014.wordpress.com/2014/06/22/testing-the-gpio-api/
> >> [3] - http://www.newhavendisplay.com/nhd0216k3zflgbwv3-p-5738.html
> >
> >
> >
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>
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