/***************************************************************************//**
* @brief
* Reset LETIMER to the same state that it was in after a hardware reset.
*
* @note
* The ROUTE register is NOT reset by this function to allow for
* a centralized setup of this feature.
*
* @param[in] letimer
* A pointer to the LETIMER peripheral register block.
******************************************************************************/
void LETIMER_Reset(LETIMER_TypeDef *letimer)
{
#if defined(_LETIMER_FREEZE_MASK)
/* Freeze registers to avoid stalling for LF synchronization. */
LETIMER_FreezeEnable(letimer, true);
#endif
/* Make sure disabled first, before resetting other registers. */
letimer->CMD = LETIMER_CMD_STOP | LETIMER_CMD_CLEAR
| LETIMER_CMD_CTO0 | LETIMER_CMD_CTO1;
letimer->CTRL = _LETIMER_CTRL_RESETVALUE;
letimer->COMP0 = _LETIMER_COMP0_RESETVALUE;
letimer->COMP1 = _LETIMER_COMP1_RESETVALUE;
letimer->REP0 = _LETIMER_REP0_RESETVALUE;
letimer->REP1 = _LETIMER_REP1_RESETVALUE;
letimer->IEN = _LETIMER_IEN_RESETVALUE;
LETIMER_IntClear(letimer, _LETIMER_IF_MASK);
#if defined(_LETIMER_FREEZE_MASK)
/* Unfreeze registers and pass new settings to LETIMER. */
LETIMER_FreezeEnable(letimer, false);
#endif
#if defined(_LETIMER_SYNCBUSY_MASK)
while (LETIMER0->SYNCBUSY & _LETIMER_SYNCBUSY_MASK) {
}
#endif
#if defined (LETIMER_EN_EN)
letimer->EN_CLR = LETIMER_EN_EN;
#endif
}
/*
* Function Name: ADC_setup
* Description: Configures ADC0
*/
void LEUART_Setup(void)
{
/* Enabling the required clocks */
CMU_ClockEnable(cmuClock_LFB, true); //Enable the clock input to LETIMER
CMU_ClockSelectSet(cmuClock_LFB, cmuSelect_LFXO); //Selecting the ULFRCO as the source clock
CMU_ClockEnable(cmuClock_LEUART0, true); //Enable the clock input to LETIMER
/* Defining the LEUART1 initialization data */
LEUART_Init_TypeDef leuart0Init =
{
.enable = leuartEnable, // Activate data reception on LEUn_TX pin.
.refFreq = 0, // Inherit the clock frequency from the LEUART clock source
.baudrate = LEUART0_BAUD, // Baudrate = 9600 bps
.databits = LEUART0_Databits, // Each LEUART frame contains 8 databits
.parity = LEUART0_Parity, // No parity bits in use
.stopbits = LEUART0_Stopbits, // Setting the number of stop bits in a frame to 2 bitperiods
};
LEUART_Init(LEUART0, &leuart0Init);
// Route LEUART1 TX,RX pin to DMA location 0
LEUART0->ROUTE = LEUART_ROUTE_TXPEN | LEUART_ROUTE_RXPEN | LEUART_ROUTE_LOCATION_LOC0;
// Enable GPIO for LEUART1. TX is on D4
GPIO_PinModeSet(gpioPortD, 4, gpioModePushPull, 0);
// Enable GPIO for LEUART1. RX is on D5
GPIO_PinModeSet(gpioPortD, 5, gpioModeInputPull, 0);
// Pull PD15(CTS pin of BLE module) to GRND
GPIO_PinModeSet(gpioPortD, 15, gpioModePushPull, 0);
}
/*
*Function name: LETIMER0_IRQHandler
*Description : Interrupt Service Routine for LETIMER.
*/
void LETIMER0_IRQHandler(void)
{
LETIMER_IntClear(LETIMER0, LETIMER_IF_UF); //Clear LETIMER0 underflow (UF) and COMP1 flag.
DMA_ActivateBasic(DMA_CHANNEL_ADC, true, false, (void *)ADC_Buffer, (void *)&(ADC0->SINGLEDATA), ADC_SAMPLES - 1);
ADC_Setup();
// ADC start
ADC_Start(ADC0, adcStartSingle);
unblockSleepMode(EM2);
blockSleepMode(EM1);
trfComplete=false;
}
