/**
* Initialize the AST as event generator.
*/
static void init_ast(void)
{
struct ast_config ast_conf;
/* Enable osc32 oscillator */
if (!osc_is_ready(OSC_ID_OSC32)) {
osc_enable(OSC_ID_OSC32);
osc_wait_ready(OSC_ID_OSC32);
}
/* Enable the AST */
ast_enable(AST);
/* Configure the AST with counter mode and set counter to 0 */
ast_conf.mode = AST_COUNTER_MODE;
ast_conf.osc_type = AST_OSC_32KHZ;
ast_conf.psel = AST_PSEL_32KHZ_1HZ;
ast_conf.counter = 0;
ast_set_config(AST, &ast_conf);
/* Enable period enent of AST */
ast_write_periodic0_value(AST, AST_PSEL_32KHZ_1HZ);
ast_enable_event(AST, AST_EVENT_PER);
}
int main(void)
{
enum sleepmgr_mode current_sleep_mode = SLEEPMGR_ACTIVE;
uint32_t ast_counter = 0;
/*
* Initialize the synchronous clock system to the default configuration
* set in conf_clock.h.
* \note All non-essential peripheral clocks are initially disabled.
*/
sysclk_init();
/*
* Initialize the resources used by this example to the default
* configuration set in conf_board.h
*/
board_init();
/*
* Turn the activity status LED on to inform the user that the device
* is active.
*/
ioport_set_pin_level(LED_ACTIVITY_STATUS_PIN, LED_STATUS_ON);
osc_priv_enable_osc32();
/* Enable the AST clock. */
ast_enable(AST);
/* Initialize the AST in Counter mode. */
struct ast_config ast_conf;
ast_conf.mode = AST_COUNTER_MODE;
ast_conf.osc_type = AST_OSC_1KHZ;
ast_conf.psel = AST_PSEL_32KHZ_1HZ - 6;
ast_conf.counter = ast_counter;
ast_set_config(AST, &ast_conf);
/*
* Configure the AST to wake up the CPU when the counter reaches the
* selected periodic0 value.
*/
ast_write_periodic0_value(AST, AST_PSEL_32KHZ_1HZ - 3);
ast_enable_wakeup(AST, AST_WAKEUP_PER);
ast_enable_event(AST, AST_EVENT_PER);
ast_clear_interrupt_flag(AST, AST_INTERRUPT_PER);
ast_set_callback(AST, AST_INTERRUPT_PER, ast_per_interrupt_callback,
AST_PER_IRQn, 0);
/* AST can wakeup the device */
bpm_enable_wakeup_source(BPM, (1 << BPM_BKUPWEN_AST));
/* Initialize the sleep manager, lock initial mode.*/
sleepmgr_init();
sleepmgr_lock_mode(current_sleep_mode);
while (1) {
/*
* Turn the activity status LED off to inform the user that the
* device is in a sleep mode.
*/
ioport_set_pin_level(LED_ACTIVITY_STATUS_PIN, LED_STATUS_OFF);
/*
* Go to sleep in the deepest allowed sleep mode (i.e. no
* deeper than the currently locked sleep mode).
*/
sleepmgr_enter_sleep();
/*
* Turn the activity status LED on to inform the user that the
* device is active.
*/
ioport_set_pin_level(LED_ACTIVITY_STATUS_PIN, LED_STATUS_ON);
/* Unlock the current sleep mode. */
sleepmgr_unlock_mode(current_sleep_mode);
/* Add a 3s delay. */
delay_s(3);
/* Lock the next sleep mode. */
++current_sleep_mode;
if ((current_sleep_mode >= SLEEPMGR_NR_OF_MODES)) {
current_sleep_mode = SLEEPMGR_ACTIVE;
}
sleepmgr_lock_mode(current_sleep_mode);
}
}
