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add_alarm_at() function
Add an alarm callback to be called at a specific time Generally the callback is called as soon as possible after the time specified from an IRQ handler on the core of the default alarm pool (generally core 0). If the callback is in the past or happens before the alarm setup could be completed, then this method will optionally call the callback itself and then return a return code to indicate that the target time has passed.
Syntax
static inline alarm_id_t add_alarm_at(absolute_time_t time,
alarm_callback_t callback,
void *user_data,
bool fire_if_past);
Return value
>0 the alarm id 0 if the alarm time passed before or during the call and fire_if_past was false <0 if there were no alarm slots available, or other error occurred
Notes
It is safe to call this method from an IRQ handler (including alarm callbacks), and from either core.