static void button_handler(int id, int irq)
{
uint8_t newset = board_buttons();
lowsyslog("IRQ:%d Button %d:%s SET:%02x:\n",
irq, id, g_buttoninfo[BUTTON_INDEX(id)].name, newset);
show_buttons(g_oldset, newset);
g_oldset = newset;
}
static void show_buttons(uint8_t oldset, uint8_t newset)
{
uint8_t chgset = oldset ^ newset;
int i;
/* Update the count of button presses shown */
#ifdef CONFIG_NSH_BUILTIN_APPS
if ((chgset & newset) != 0)
{
g_nbuttons++;
}
#endif
/* Show each button state change */
for (i = MIN_BUTTON; i <= MAX_BUTTON; i++)
{
uint8_t mask = (1 << i);
if ((chgset & mask) != 0)
{
FAR const char *state;
/* Get the button state */
if ((newset & mask) != 0)
{
state = "depressed";
}
else
{
state = "released";
}
/* Use lowsyslog() because we make be executing from an
* interrupt handler.
*/
lowsyslog(LOG_INFO, " %s %s\n",
g_buttoninfo[BUTTON_INDEX(i)].name, state);
}
}
}
void up_pmbuttons(void)
{
/* Initialize the button GPIOs */
board_button_initialize();
#ifdef CONFIG_ARCH_IRQBUTTONS
int i;
for (i = CONFIG_PM_IRQBUTTONS_MIN; i <= CONFIG_PM_IRQBUTTONS_MAX; i++)
{
xcpt_t oldhandler = board_button_irq(i, g_buttonhandlers[BUTTON_INDEX(i)]);
if (oldhandler != NULL)
{
lowsyslog(LOG_WARNING, "WARNING: oldhandler:%p is not NULL! "
"Button events may be lost or aliased!\n",
oldhandler);
}
}
#endif
}
int buttons_main(int argc, char *argv[])
{
uint8_t newset;
irqstate_t flags;
int i;
/* If this example is configured as an NX add-on, then limit the number of
* samples that we collect before returning. Otherwise, we never return
*/
#ifdef CONFIG_NSH_BUILTIN_APPS
long maxbuttons = 1;
g_nbuttons = 0;
if (argc > 1)
{
maxbuttons = strtol(argv[1], NULL, 10);
}
lowsyslog("maxbuttons: %d\n", maxbuttons);
#endif
/* Initialize the button GPIOs */
board_button_initialize();
/* Register to recieve button interrupts */
#ifdef CONFIG_ARCH_IRQBUTTONS
for (i = CONFIG_EXAMPLES_IRQBUTTONS_MIN; i <= CONFIG_EXAMPLES_IRQBUTTONS_MAX; i++)
{
xcpt_t oldhandler = board_button_irq(i, g_buttoninfo[BUTTON_INDEX(i)].handler);
/* Use lowsyslog() for compatibility with interrrupt handler output. */
lowsyslog("Attached handler at %p to button %d [%s], oldhandler:%p\n",
g_buttoninfo[BUTTON_INDEX(i)].handler, i,
g_buttoninfo[BUTTON_INDEX(i)].name, oldhandler);
/* Some hardware multiplexes different GPIO button sources to the same
* physical interrupt. If we register multiple such multiplexed button
* interrupts, then the second registration will overwrite the first. In
* this case, the first button interrupts may be aliased to the second
* interrupt handler (or worse, could be lost).
*/
if (oldhandler != NULL)
{
lowsyslog("WARNING: oldhandler:%p is not NULL! "
"Button events may be lost or aliased!\n",
oldhandler);
}
}
#endif
/* Poll button state */
g_oldset = board_buttons();
#ifdef CONFIG_NSH_BUILTIN_APPS
while (g_nbuttons < maxbuttons)
#else
for (;;)
#endif
{
/* Get the set of pressed and release buttons. */
newset = board_buttons();
/* Any changes from the last sample? */
if (newset != g_oldset)
{
/* Disable interrupts so that output here will not collide with
* output from an interrupt handler.
*/
flags = irqsave();
/* Use lowsyslog() for compatibility with interrrupt handler
* output.
*/
lowsyslog("POLL SET:%02x:\n", newset);
show_buttons(g_oldset, newset);
g_oldset = newset;
irqrestore(flags);
}
/* Sleep a little... but not long. This will determine how fast we
* poll for button changes.
*/
usleep(150000); /* 150 Milliseconds */
}
/* Un-register button handlers */
#if defined(CONFIG_ARCH_IRQBUTTONS) && defined(CONFIG_NSH_BUILTIN_APPS)
for (i = CONFIG_EXAMPLES_IRQBUTTONS_MIN; i <= CONFIG_EXAMPLES_IRQBUTTONS_MAX; i++)
{
(void)board_button_irq(i, NULL);
}
#endif
return 0;
}
