/** Initialize the low power ticker
*
*/
void lp_ticker_init(void)
{
lptmr_config_t lptmrConfig;
if (lp_ticker_inited) {
return;
}
lp_ticker_inited = true;
/* Setup low resolution clock - RTC */
if (!rtc_isenabled()) {
rtc_init();
RTC_DisableInterrupts(RTC, kRTC_AlarmInterruptEnable | kRTC_SecondsInterruptEnable);
RTC_StartTimer(RTC);
}
RTC->TAR = 0; /* Write clears the IRQ flag */
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_SetVector(RTC_IRQn, (uint32_t)rtc_isr);
NVIC_EnableIRQ(RTC_IRQn);
/* Setup high resolution clock - LPTMR */
LPTMR_GetDefaultConfig(&lptmrConfig);
/* Use 32kHz drive */
CLOCK_SetXtal32Freq(OSC32K_CLK_HZ);
lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_2;
LPTMR_Init(LPTMR0, &lptmrConfig);
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
NVIC_ClearPendingIRQ(LPTMR0_IRQn);
NVIC_SetVector(LPTMR0_IRQn, (uint32_t)lptmr_isr);
EnableIRQ(LPTMR0_IRQn);
}
/* Enable the trigger source of LPTimer */
static void LPTMR_InitTriggerSourceOfAdc(LPTMR_Type *base)
{
lptmr_config_t lptmrUserConfig;
/*
* lptmrUserConfig.timerMode = kLPTMR_TimerModeTimeCounter;
* lptmrUserConfig.pinSelect = kLPTMR_PinSelectInput_0;
* lptmrUserConfig.pinPolarity = kLPTMR_PinPolarityActiveHigh;
* lptmrUserConfig.enableFreeRunning = false;
* lptmrUserConfig.bypassPrescaler = true;
* lptmrUserConfig.prescalerClockSource = kLPTMR_PrescalerClock_1;
* lptmrUserConfig.value = kLPTMR_Prescale_Glitch_0;
*/
LPTMR_GetDefaultConfig(&lptmrUserConfig);
/* Init LPTimer driver */
LPTMR_Init(base, &lptmrUserConfig);
/* Set the LPTimer period */
LPTMR_SetTimerPeriod(base, LPTMR_COMPARE_VALUE);
/* Start the LPTimer */
LPTMR_StartTimer(base);
/* Configure SIM for ADC hw trigger source selection */
BOARD_ConfigTriggerSource();
}
/*!
* @brief Main function
*/
int main(void)
{
uint32_t currentCounter = 0U;
lptmr_config_t lptmrConfig;
LED_INIT();
/* Board pin, clock, debug console init */
BOARD_InitPins();
BOARD_BootClockRUN();
BOARD_InitDebugConsole();
/* Configure LPTMR */
/*
* lptmrConfig.timerMode = kLPTMR_TimerModeTimeCounter;
* lptmrConfig.pinSelect = kLPTMR_PinSelectInput_0;
* lptmrConfig.pinPolarity = kLPTMR_PinPolarityActiveHigh;
* lptmrConfig.enableFreeRunning = false;
* lptmrConfig.bypassPrescaler = true;
* lptmrConfig.prescalerClockSource = kLPTMR_PrescalerClock_1;
* lptmrConfig.value = kLPTMR_Prescale_Glitch_0;
*/
LPTMR_GetDefaultConfig(&lptmrConfig);
/* Initialize the LPTMR */
LPTMR_Init(LPTMR0, &lptmrConfig);
/* Set timer period */
LPTMR_SetTimerPeriod(LPTMR0, USEC_TO_COUNT(1000000U, LPTMR_SOURCE_CLOCK));
/* Enable timer interrupt */
LPTMR_EnableInterrupts(LPTMR0, kLPTMR_TimerInterruptEnable);
/* Enable at the NVIC */
EnableIRQ(LPTMR0_IRQn);
PRINTF("Low Power Timer Example\r\n");
/* Start counting */
LPTMR_StartTimer(LPTMR0);
while (1)
{
if (currentCounter != lptmrCounter)
{
currentCounter = lptmrCounter;
PRINTF("LPTMR interrupt No.%d \r\n", currentCounter);
}
}
}
