xcpt_t board_button_irq(int id, xcpt_t irqhandler)
{
xcpt_t oldhandler = NULL;
if (id >=0 && id < NUM_BUTTONS)
{
irqstate_t flags;
/* Disable interrupts until we are done. This guarantees that the
* following operations are atomic.
*/
flags = enter_critical_section();
/* Get/set the old button handler
*
* REVISIT: Keeping copies of the hander in RAM seems wasteful
* since the OS already has this information internally.
*/
#if 0 /* REVISIT */
oldhandler = g_button_handlers[id];
g_button_handlers[id] = irqhandler;
#else
oldhandler = NULL;
#endif
/* Are we attaching or detaching? */
if (irqhandler != NULL)
{
/* Configure the interrupt */
efm32_gpioirq(g_button_configs[id]);
/* Attach and enable the interrupt */
(void)irq_attach(g_button_irqs[id], irqhandler);
efm32_gpioirqenable(g_button_irqs[id]);
}
else
{
/* Disable and detach the interrupt */
efm32_gpioirqdisable(g_button_irqs[id]);
(void)irq_detach(g_button_irqs[id]);
}
leave_critical_section(flags);
}
/* Return the old button handler (so that it can be restored) */
return oldhandler;
}
int board_button_irq(int id, xcpt_t irqhandler, FAR void *arg)
{
if (id >=0 && id < NUM_BUTTONS)
{
irqstate_t flags;
/* Disable interrupts until we are done. This guarantees that the
* following operations are atomic.
*/
flags = enter_critical_section();
/* Are we attaching or detaching? */
if (irqhandler != NULL)
{
/* Configure the interrupt */
efm32_gpioirq(g_button_configs[id]);
/* Attach and enable the interrupt */
(void)irq_attach(g_button_irqs[id], irqhandler, arg);
efm32_gpioirqenable(g_button_irqs[id]);
}
else
{
/* Disable and detach the interrupt */
efm32_gpioirqdisable(g_button_irqs[id]);
(void)irq_detach(g_button_irqs[id]);
}
leave_critical_section(flags);
}
/* Return the old button handler (so that it can be restored) */
return OK;
}
