platform_result_t platform_rtc_exit_powersave( uint32_t requested_sleep_time, uint32_t *cpu_sleep_time )
{
uint32_t time_units_passed_since_powersave_enter; /* time unit is 1.25ms when we are sleeping */
#ifdef WICED_ENABLE_MCU_RTC
uint32_t seconds_contribution;
static int leftover=0;
#endif /* #ifdef WICED_ENABLE_MCU_RTC */
float temp;
/* Get current calendar register values and convert them to a number of 1.25ms that passed since power-save entry */
time_units_passed_since_powersave_enter = convert_rtc_calendar_values_to_units_passed();
#ifdef WICED_ENABLE_MCU_RTC
/* Make contribution of time-units to the current time, get the leftover that is less then a second */
leftover+= add_1p25ms_contribution( time_units_passed_since_powersave_enter, &seconds_contribution );
/* Subtract 1 second for every 1.25 * 800, because in reality we are running 799,2195Hz which wil give the tick value = 1.25122 */
if( leftover > NUM_1P25MS_IN_SEC )
{
compensate_time_error(1, WICED_FALSE);
leftover -= NUM_1P25MS_IN_SEC;
}
#endif /* #ifdef WICED_ENABLE_MCU_RTC */
//#ifdef RTC_ENABLED /* !!If we dont set the time after the clocks have been changed. */
/*get an error while trying to enter STM RTC initialisation mode */
/* update RTC time */
platform_rtc_set_time(&saved_rtc_time);
//#endif /* #ifdef RTC_ENABLED */
/* Change, rtc clock state and update rtc peripheral, even when RTC is not enabled */
/* reducing clock frequency is better for power consumption */
stm32f2_rtc_change_clock( ¤t_clock_state, CLOCKING_EVERY_SEC );
temp = (float)time_units_passed_since_powersave_enter * (float)1.25;
/* Round up to milliseconds, not a problem if the system will get less ticks as expected, it is not a time which is populated to a user */
if( requested_sleep_time > 1 )
{
*cpu_sleep_time = (uint32_t)temp;
}
else
{
/* When a delay was set to 1, we will get a wake up interrupt before RTC tick */
/* we will think that there were no rtc tick, and the cpu_sleep_time will be set to 0 */
/* operating system will miss a tick which in reality did happen */
*cpu_sleep_time = 1;
}
return PLATFORM_SUCCESS;
}
/**
* This function will set MCU RTC time to a new value. Time value must be given in the format of
* the structure wiced_rtc_time_t
*
* @return WICED_SUCCESS : on success.
* @return WICED_ERROR : if an error occurred with any step
*/
OSStatus platform_rtc_set_time( const mico_rtc_time_t* time )
{
#ifdef MICO_ENABLE_MCU_RTC
bool valid = false;
MICO_VERIFY_TIME(time, valid);
if( valid == false )
{
return kParamErr;
}
Chip_RTC_SetCount(LPC_RTC, convert_rtc_calendar_values_to_units_passed( time ));
return kNoErr;
#else /* #ifdef MICO_ENABLE_MCU_RTC */
UNUSED_PARAMETER(time);
return kUnsupportedErr;
#endif /* #ifdef MICO_ENABLE_MCU_RTC */
}
