BBB GPIO api interrupt handler problem

[Gedare Bloom]

is printk safe to use in the interrupt context? does it blow the stack?

On Mon, Nov 9, 2015 at 1:11 PM, Federico Garcia Cruz <
federico.garciacruz at tallertechnologies.com> wrote:

> Hi everyone,
> I'm using the GPIO api for the BBB but I'm having problems with the
> interrupt handling.
> I'm blinking two leds in the main thread and I have a GPIO input with an
> interrupt attached that uses printk to print a message. The problem is that
> the interrupt handler prints the message but never returns (main thread
> leds stop blinking after that).
> Any suggestion?
> Here's my code:
>
> rtems_gpio_irq_state gpio_handler(void* /*arg*/)
> {
>     printk("interrupt handler\n");
>     return IRQ_HANDLED;
> }
>
>
> void* POSIX_Init(void*)
> {
>     rtems_mode previous_mode_set;
>     rtems_task_mode(RTEMS_TIMESLICE | RTEMS_PREEMPT, RTEMS_TIMESLICE_MASK
> | RTEMS_PREEMPT_MASK, &previous_mode_set);
>     rtems_status_code sc = rtems_gpio_initialize();
>     printk("%d\n", sc);
>
>     sc = rtems_gpio_request_pin(BBB_LED_USR0, DIGITAL_OUTPUT, true, false,
> NULL);
>     printk("DIGITAL_OUTPUT: %d\n", sc);
>     sc = rtems_gpio_request_pin(BBB_LED_USR3, DIGITAL_OUTPUT, true, false,
> NULL);
>     printk("DIGITAL_OUTPUT: %d\n", sc);
>
>     sc = rtems_gpio_request_pin(BBB_P8_7, DIGITAL_INPUT, false, false,
> NULL);
>     printk("DIGITAL_INPUT: %d\n", sc);
>
>     sc = rtems_gpio_enable_interrupt(BBB_P8_7, FALLING_EDGE,
> UNIQUE_HANDLER, false, gpio_handler, NULL);
>     printk("interrupt install: %d\n", sc);
>
>     while(1)
>     {
>         sleep(1);
>         rtems_gpio_clear(BBB_LED_USR3);
>         rtems_gpio_set(BBB_LED_USR0);
>         sleep(1);
>         rtems_gpio_set(BBB_LED_USR3);
>         rtems_gpio_clear(BBB_LED_USR0);
>     }
>     return NULL;
> }
>
> Thanks in advance!
> --
>
> <http://www.tallertechnologies.com>
>
>
> Federico Garcia Cruz
>
> Software Engineer
>
>
> San Lorenzo 47, 3rd Floor, Office 5
>
> Córdoba, Argentina
>
>
> Phone: +54 351 4217888 / +54 351 4218211
>
>
> <http://www.linkedin.com/company/taller-technologies>
> <https://www.facebook.com/tallertechnologies>
>
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