Usage Code

We can get the calendar value by:

calendar = ast_read_calendar_value(AST); 

Or we can get the counter value by:

ast_counter = ast_read_counter_value(AST); 

We can set the alarm interrupt by:

* ast_write_alarm0_value(AST, calendar.field + 1);
* ast_set_callback(AST, ast_interrupt_alarm, ast_alarm_callback,
*    AST_ALARM_IRQn, 1); 

And we can set the periodic interrupt by:

* ast_write_periodic0_value(AST, AST_PSEL_32KHZ_1HZ - 4);
* ast_set_callback(AST, ast_interrupt_per, ast_per_callback,
*    AST_PER_IRQn, 1);