void rtc_init(void)
{
/* enable clocks */
CMU_ClockEnable(cmuClock_CORELE, true);
CMU_ClockEnable(cmuClock_RTCC, true);
/* reset and initialize peripheral */
EFM32_CREATE_INIT(init, RTCC_Init_TypeDef, RTCC_INIT_DEFAULT,
.conf.enable = false,
.conf.presc = rtccCntPresc_32768,
.conf.cntMode = rtccCntModeCalendar
);
RTCC_Reset();
RTCC_Init(&init.conf);
/* initialize alarm channel */
RTCC_CCChConf_TypeDef init_channel = RTCC_CH_INIT_COMPARE_DEFAULT;
RTCC_ChannelInit(0, &init_channel);
/* enable interrupt */
NVIC_ClearPendingIRQ(RTCC_IRQn);
NVIC_EnableIRQ(RTCC_IRQn);
/* enable peripheral */
RTCC_Enable(true);
}
/**************************************************************************//**
* @brief Enables LFECLK and selects clock source for RTCC
* Sets up the RTCC to generate an interrupt every second.
*****************************************************************************/
static void rtccSetup(unsigned int frequency)
{
RTCC_Init_TypeDef rtccInit = RTCC_INIT_DEFAULT;
rtccInit.presc = rtccCntPresc_1;
palClockSetup(cmuClock_LFE);
/* Enable RTCC clock */
CMU_ClockEnable(cmuClock_RTCC, true);
/* Initialize RTC */
rtccInit.enable = false; /* Do not start RTC after initialization is complete. */
rtccInit.debugRun = false; /* Halt RTC when debugging. */
rtccInit.cntWrapOnCCV1 = true; /* Wrap around on CCV1 match. */
RTCC_Init(&rtccInit);
/* Interrupt at given frequency. */
RTCC_CCChConf_TypeDef ccchConf = RTCC_CH_INIT_COMPARE_DEFAULT;
ccchConf.compMatchOutAction = rtccCompMatchOutActionToggle;
RTCC_ChannelInit(1, &ccchConf);
RTCC_ChannelCCVSet(1, (CMU_ClockFreqGet(cmuClock_RTCC) / frequency) - 1);
#ifndef INCLUDE_PAL_GPIO_PIN_AUTO_TOGGLE_HW_ONLY
/* Enable interrupt */
NVIC_EnableIRQ(RTCC_IRQn);
RTCC_IntEnable(RTCC_IEN_CC1);
#endif
RTCC->CNT = _RTCC_CNT_RESETVALUE;
/* Start Counter */
RTCC_Enable(true);
}
void vPortSetupTimerInterrupt( void )
{
/* Configure the RTCC to generate the RTOS tick interrupt. */
/* The maximum number of ticks that can be suppressed depends on the clock
frequency. */
xMaximumPossibleSuppressedTicks = ULONG_MAX / ulReloadValueForOneTick;
/* Ensure LE modules are accessible. */
CMU_ClockEnable( cmuClock_CORELE, true );
/* Use LFXO. */
CMU_ClockSelectSet( cmuClock_LFE, cmuSelect_LFXO );
/* Enable clock to the RTC module. */
CMU_ClockEnable( cmuClock_RTCC, true );
/* Use channel 1 to generate the RTOS tick interrupt. */
RTCC_ChannelCCVSet( lpRTCC_CHANNEL, ulReloadValueForOneTick );
RTCC_Init( &xRTCInitStruct );
RTCC_ChannelInit( lpRTCC_CHANNEL, &xRTCCChannel1InitStruct );
RTCC_EM4WakeupEnable( true );
/* Disable RTCC interrupt. */
RTCC_IntDisable( _RTCC_IF_MASK );
RTCC_IntClear( _RTCC_IF_MASK );
RTCC->CNT = _RTCC_CNT_RESETVALUE;
/* The tick interrupt must be set to the lowest priority possible. */
NVIC_SetPriority( RTCC_IRQn, configLIBRARY_LOWEST_INTERRUPT_PRIORITY );
NVIC_ClearPendingIRQ( RTCC_IRQn );
NVIC_EnableIRQ( RTCC_IRQn );
RTCC_IntEnable( RTCC_IEN_CC1 );
RTCC_Enable( true );
#if( lpUSE_TEST_TIMER == 1 )
{
void prvSetupTestTimer( void );
/* A second timer is used to test the path where the MCU is brought out
of a low power state by a timer other than the tick timer. */
prvSetupTestTimer();
}
#endif
}
void lp_ticker_set_interrupt(timestamp_t timestamp)
{
uint64_t timestamp_ticks;
uint64_t current_ticks = RTCC_CounterGet();
timestamp_t current_time = ((uint64_t)(current_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT));
/* Initialize RTC */
lp_ticker_init();
/* calculate offset value */
timestamp_t offset = timestamp - current_time;
if(offset > 0xEFFFFFFF) offset = 100;
/* map offset to RTC value */
// ticks = offset * RTC frequency div 1000000
timestamp_ticks = ((uint64_t)offset * (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) / 1000000;
// checking the rounding. If timeout is wanted between RTCC ticks, irq should be configured to
// trigger in the latter RTCC-tick. Otherwise ticker-api fails to send timer event to its client
if(((timestamp_ticks * 1000000) / (LOW_ENERGY_CLOCK_FREQUENCY / RTC_CLOCKDIV_INT)) < offset){
timestamp_ticks++;
}
timestamp_ticks += current_ticks;
/* RTCC has 32 bit resolution */
timestamp_ticks &= 0xFFFFFFFF;
/* check for RTCC limitation */
if((timestamp_ticks - RTCC_CounterGet()) >= 0x80000000) timestamp_ticks = RTCC_CounterGet() + 2;
/* init channel */
RTCC_CCChConf_TypeDef ccchConf = RTCC_CH_INIT_COMPARE_DEFAULT;
RTCC_ChannelInit(0,&ccchConf);
/* Set callback */
RTCC_ChannelCCVSet(0, (uint32_t)timestamp_ticks);
RTCC_IntEnable(RTCC_IF_CC0);
}
/***************************************************************************//**
* @brief
* Initialize RTCDRV driver.
*
* @details
* Will enable all necessary clocks. Initializes internal datastructures
* and configures the underlying hardware timer.
*
* @return
* @ref ECODE_EMDRV_RTCDRV_OK.
******************************************************************************/
Ecode_t RTCDRV_Init( void )
{
if ( rtcdrvIsInitialized == true ) {
return ECODE_EMDRV_RTCDRV_OK;
}
rtcdrvIsInitialized = true;
// Ensure LE modules are clocked.
CMU_ClockEnable( cmuClock_CORELE, true );
#if defined( CMU_LFECLKEN0_RTCC )
// Enable LFECLK in CMU (will also enable oscillator if not enabled).
CMU_ClockSelectSet( cmuClock_LFE, RTCDRV_OSC );
#else
// Enable LFACLK in CMU (will also enable oscillator if not enabled).
CMU_ClockSelectSet( cmuClock_LFA, RTCDRV_OSC );
#endif
#if defined( RTCDRV_USE_RTC )
// Set clock divider.
CMU_ClockDivSet( cmuClock_RTC, RTC_DIVIDER );
// Enable RTC module clock.
CMU_ClockEnable( cmuClock_RTC, true );
// Initialize RTC.
RTC_Init( &initRTC );
#elif defined( RTCDRV_USE_RTCC )
// Set clock divider.
initRTCC.presc = (RTCC_CntPresc_TypeDef)CMU_DivToLog2( RTC_DIVIDER );
// Enable RTCC module clock.
CMU_ClockEnable( cmuClock_RTCC, true );
// Initialize RTCC.
RTCC_Init( &initRTCC );
// Set up Compare channel.
RTCC_ChannelInit( 1, &initRTCCCompareChannel );
#endif
// Disable RTC/RTCC interrupt generation.
RTC_INTDISABLE( RTC_ALL_INTS );
RTC_INTCLEAR( RTC_ALL_INTS );
RTC_COUNTERRESET();
// Clear and then enable RTC interrupts in NVIC.
NVIC_CLEARPENDINGIRQ();
NVIC_ENABLEIRQ();
#if defined( EMDRV_RTCDRV_WALLCLOCK_CONFIG )
// Enable overflow interrupt for wallclock.
RTC_INTENABLE( RTC_OF_INT );
#endif
// Reset RTCDRV internal data structures/variables.
memset( timer, 0, sizeof( timer ) );
inTimerIRQ = false;
rtcRunning = false;
startTimerNestingLevel = 0;
#if defined( EMODE_DYNAMIC )
sleepBlocked = false;
#endif
#if defined( EMDRV_RTCDRV_WALLCLOCK_CONFIG )
wallClockOverflowCnt = 0;
wallClockTimeBase = 0;
#if defined( EMODE_NEVER_ALLOW_EM3EM4 )
// Always block EM3 and EM4 if wallclock is running.
SLEEP_SleepBlockBegin( sleepEM3 );
#endif
#endif
return ECODE_EMDRV_RTCDRV_OK;
}