[Gnuk-users] porting GNUK to other MCUs

[Aurel]

Thanks a lot.
I already started trying to make the example-led work, I'm not quick, but
that's a good learning exercise :)

On Mon, Jun 22, 2015 at 10:18 PM, NIIBE Yutaka <gniibe at fsij.org> wrote:

> On 06/22/2015 10:33 AM, NIIBE Yutaka wrote:
> > Yes, I think so.   Basically, we need three things.
> >
> >  (1) Porting board specific things: clock, LED, etc.
> >      This part would be easy, when you have a specification.
> >
> >  (2) Porting Chopstx (the thread library) to Cortex-M4.
> >      This part would not be that hard, as you describe.
> >
> >  (3) Porting MCU specific things: USB controller and ADC converter
> >      drivers.
> >      This part takes time to understand the MCU.
>
> Kaz Kojima kindly (re-)introduced the port for STM32 Primer2.  I think
> that this is a good opportunity to explain the porting effort.
>
> I think that the steps would be:
>
> (1) The first target is chopstx/example-led, which blinks LED
>     periodically.
>
>     (1-1) You need a board definition under chopstx/board/,
>           copying from similar one.
>
>           Basically, there are three variants, currently:
>           STM32F0, smaller STM32F103 (with flash ROM size 1024)
>           and medium STM32F103 (with flash ROM size 2048 and more GPIO)
>
>     (1-2) You might need to modify chopstx/clk_gpio_init.c.
>
>           This is an implementation of clock setting and GPIO
>           initialization.
>
>     (1-3) You might need to modify chopstx/entry.c.
>
>           If exception/interrupt model is different, you need to
>           modify this, too.
>
>     (1-4) Then, try chopstx/example-led/.
>
>           chopstx/example-led/sys.c include system service routines
>           for LED, flash ROM access, and USB initialization.
>
>           You can just ignore things for flash ROM access and USB
>           initialization and just implement the set_led function
>           with corresponding board definition.
>
>     (1-5) If it works, great.  If not, you need to port
>           chopstx/chopstx.c, the thread implementation.
>
> (2) Next is porting chopstx/example-cdc/usb_stm32f103.c, the
>     USB driver.
>
> (3) Then, try NeuG standalone device by porting
>     neug/src/adc_stm32f103.c (the ADC driver).
>
> (4) When (1)..(3) is going well, Gnuk is mostly ready for you.
>     I think that it's only modifying the help message in
>     gnuk/src/configure and possibly the Makefile.
> --
>
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