Re: [libopenstm32-devel] gpio_toggle and examples question

[Краљевић М. <kra...@gm...>]

On Sun, Jan 30, 2011 at 4:13 PM, Uwe Hermann <uw...@he...> wrote:
> Nice! I also have one of those around now. How do you program them
> though? AFAIK it needs SWD and last time I check OpenOCD support for SWD
> was not ready yet. Do you use some tool which relies on the internal
> bootloader?
>

I've been programming through the builtin serial bootloader, there is
a little gpl'd C program for this here:
http://code.google.com/p/stm32flash/

You need a RS-232 <> 3.3V TTL level shifter hooked to USART1, so
either a MAX3232, or one of the FTDI deals. I usually just buy Nokia
CA-42 cables and cut the end off, they are something like $3 for
chinese knockoffs and use a PL2303 or ARK3116 (at least the ones I've
come across). There's a driver in linux for both of those ICs for
quite some time. Just plug it in and go.
No debug, of course.

> Sure, having a few examples for the STM32 discovery board would be nice.
>

I'll try and modify some of the examples to the discovery and submit
them some time in the near future.

>> void gpio_toggle(u32 gpioport, u16 gpios)
>> {
>>       GPIO_ODR(gpioport) = GPIO_IDR(gpioport) ^ gpios;
>> }
>
> This one is probably the best option.
>
>
>> I suppose it's the same deal either way, just not sure what is
>> preferred. I've made a little wig-wag blinker to demo it, if there is
>> any want for it.
>
> Sure.
>

Sounds good, I'm not sure the method of submitting it - Just send a
diff to the list?

>
>> What else...
>> Regarding the clock setup bits, eg.
>> rcc_clock_setup_in_hse_8mhz_out_72mhz() - Is there any thought of moving
>> this to a more universal function? say like:
>> rcc_clock_setup_hse(in_mhz, out_mhz) - or so? Do you think this is
>> worthwhile?
>
> Hm, good question. Not sure if it's worth the trouble, but it wouldn't
> hurt either, I guess.
>

I guess we would have to make it #warn if out isn't a multiple of in,
but shouldn't be hard to implement otherwise i don't think... I might
play with it and see how it goes.


> Various, an incomplete and outdated (and way too unspecific) status page
> is at:
>
> http://sourceforge.net/apps/mediawiki/libopenstm32/index.php?title=Status
>

Alright. Well I'll try and get some of the examples adapted to
discovery for now, as time allows, and go from there.