Poking around in bsp.h I figured out that the LED pins are 72 - 79 on this board, so I #DEFINEd them all as LED_BLINK_PIN_x so I could blink them all round-robin, just as an exercise.
I then changed int g_led_pin to int g_led_pins[8];
but initializing them all via
int x = 0;
while(x++ < 8){
hal_gpio_init_out(g_led_pins[x], 1);
}
results in: main.c:58:26: error: iteration 7u invokes undefined behavior
[-Werror=aggressive-loop-optimizations]
hal_gpio_init_out(g_led_pins[x], 1);
which indicates that it is caused by aggressive optimization of the loop itself
(apparently for(int x = 0; x < 8; x++) loop structure isn’t accepted).
Interestingly, when I just now changed it to:
int x;
for(x = 0; x < 8; x++){
hal_gpio_init_out(g_led_pins[x], 1);
}
It all worked fine. I now have blinky running a colorwheel. :-)
Lots to learn, I guess.
Thanks!
dg
> On May 23, 2016, at 12:32 PM, Sterling Hughes <[email protected]> wrote:
>
> Standard C stuff should be acceptable. What's not working -- note: we do
> compile with -Wall -Werror as the default setting.
>
> Sterling
>
> On 5/23/16 9:27 AM, David G. Simmons wrote:
>>
>> Another N00B question …
>>
>> Is there a language reference for mynewt? I’m seeing that standard C
>> stuff is not acceptable, so I’m wondering if there is a language
>> reference for how to do stuff in mynewt. specifically things like
>> arrays, initializing arrays, for lops, etc.
>>
>> I’m playing around with the blinky app on my new STM32F Discovery board
>> and finding some things just don’t work as I’d expect.
>>
>> TIA,
>> dg
>> --
>> David G. Simmons
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