LESENSE - Low Energy Sensor

Description

Low Energy Sensor (LESENSE) Peripheral API.

This module contains functions to control the LESENSE peripheral of Silicon Labs 32-bit MCUs and SoCs. LESENSE is a low-energy sensor interface capable of autonomously collecting and processing data from multiple sensors even when in EM2.

Data Structures

struct  LESENSE_CoreCtrlDesc_TypeDef
 Core control (LESENSE_CTRL/CFG) descriptor structure.
 
struct  LESENSE_TimeCtrlDesc_TypeDef
 LESENSE timing control descriptor structure.
 
struct  LESENSE_PerCtrlDesc_TypeDef
 LESENSE peripheral control descriptor structure.
 
struct  LESENSE_DecCtrlDesc_TypeDef
 LESENSE decoder control descriptor structure.
 
struct  LESENSE_Init_TypeDef
 LESENSE module initialization structure.
 
struct  LESENSE_ChDesc_TypeDef
 Channel descriptor structure.
 
struct  LESENSE_ChAll_TypeDef
 Configuration structure for all the scan channels.
 
struct  LESENSE_AltExDesc_TypeDef
 Alternate excitation descriptor structure.
 
struct  LESENSE_ConfAltEx_TypeDef
 Configuration structure for the alternate excitation.
 
struct  LESENSE_DecStCond_TypeDef
 Decoder state condition descriptor structure.
 
struct  LESENSE_DecStDesc_TypeDef
 Decoder state x configuration structure.
 
struct  LESENSE_DecStAll_TypeDef
 Configuration structure for decoder.
 

Functions

void LESENSE_Init (const LESENSE_Init_TypeDef *init, bool reqReset)
 Initialize the LESENSE module.
 
uint32_t LESENSE_ScanFreqSet (uint32_t refFreq, uint32_t scanFreq)
 Set the scan frequency for periodic scanning.
 
void LESENSE_ScanModeSet (LESENSE_ScanMode_TypeDef scanMode, bool start)
 Set scan mode of the LESENSE channels.
 
void LESENSE_StartDelaySet (uint8_t startDelay)
 Set the start delay of the sensor interaction on each channel.
 
void LESENSE_ClkDivSet (LESENSE_ChClk_TypeDef clk, LESENSE_ClkPresc_TypeDef clkDiv)
 Set the clock division for LESENSE timers.
 
void LESENSE_ChannelAllConfig (const LESENSE_ChAll_TypeDef *confChAll)
 Configure all (16) LESENSE sensor channels.
 
void LESENSE_ChannelConfig (const LESENSE_ChDesc_TypeDef *confCh, uint32_t chIdx)
 Configure a single LESENSE sensor channel.
 
void LESENSE_AltExConfig (const LESENSE_ConfAltEx_TypeDef *confAltEx)
 Configure the LESENSE alternate excitation modes.
 
void LESENSE_ChannelEnable (uint8_t chIdx, bool enaScanCh, bool enaPin)
 Enable/disable LESENSE scan channel and the pin assigned to it.
 
void LESENSE_ChannelEnableMask (uint16_t chMask, uint16_t pinMask)
 Enable/disable LESENSE scan channel and the pin assigned to it.
 
void LESENSE_ChannelTimingSet (uint8_t chIdx, uint8_t exTime, uint8_t sampleDelay, uint16_t measDelay)
 Set LESENSE channel timing parameters.
 
void LESENSE_ChannelThresSet (uint8_t chIdx, uint16_t acmpThres, uint16_t cntThres)
 Set LESENSE channel threshold parameters.
 
void LESENSE_ChannelSlidingWindow (uint8_t chIdx, uint32_t windowSize, uint32_t initValue)
 Configure a Sliding Window evaluation mode for a specific channel.
 
void LESENSE_ChannelStepDetection (uint8_t chIdx, uint32_t stepSize, uint32_t initValue)
 Configure the step detection evaluation mode for a specific channel.
 
void LESENSE_WindowSizeSet (uint32_t windowSize)
 Set the window size for all LESENSE channels.
 
void LESENSE_StepSizeSet (uint32_t stepSize)
 Set the step size for all LESENSE channels.
 
void LESENSE_DecoderStateAllConfig (const LESENSE_DecStAll_TypeDef *confDecStAll)
 Configure all LESENSE decoder states.
 
void LESENSE_DecoderStateConfig (const LESENSE_DecStDesc_TypeDef *confDecSt, uint32_t decSt)
 Configure a single LESENSE decoder state.
 
void LESENSE_DecoderStateSet (uint32_t decSt)
 Set the LESENSE decoder state.
 
uint32_t LESENSE_DecoderStateGet (void)
 Get the current state of the LESENSE decoder.
 
void LESENSE_DecoderPrsOut (bool enable, uint32_t decMask, uint32_t decVal)
 Enable or disable the PRS output from the LESENSE decoder.
 
void LESENSE_ScanStart (void)
 Start scanning sensors.
 
void LESENSE_ScanStop (void)
 Stop scanning sensors.
 
void LESENSE_DecoderStart (void)
 Start the LESENSE decoder.
 
void LESENSE_ResultBufferClear (void)
 Clear the result buffer.
 
void LESENSE_Reset (void)
 Reset the LESENSE module.
 
void LESENSE_DecoderStop (void)
 Stop LESENSE decoder.
 
uint32_t LESENSE_StatusGet (void)
 Get the current status of LESENSE.
 
void LESENSE_StatusWait (uint32_t flag)
 Wait until status of LESENSE is equal to what was requested.
 
uint32_t LESENSE_ChannelActiveGet (void)
 Get the currently active channel index.
 
uint32_t LESENSE_ScanResultGet (void)
 Get the latest scan comparison result (1 bit / channel).
 
uint32_t LESENSE_ScanResultDataGet (void)
 Get the oldest unread data from the result buffer.
 
uint32_t LESENSE_ScanResultDataBufferGet (uint32_t idx)
 Get data from the result data buffer.
 
uint32_t LESENSE_SensorStateGet (void)
 Get the current state of the LESENSE sensor.
 
void LESENSE_IntClear (uint32_t flags)
 Clear one or more pending LESENSE interrupts.
 
void LESENSE_IntEnable (uint32_t flags)
 Enable one or more LESENSE interrupts.
 
void LESENSE_IntDisable (uint32_t flags)
 Disable one or more LESENSE interrupts.
 
void LESENSE_IntSet (uint32_t flags)
 Set one or more pending LESENSE interrupts from SW.
 
uint32_t LESENSE_IntGet (void)
 Get pending LESENSE interrupt flags.
 
uint32_t LESENSE_IntGetEnabled (void)
 Get enabled and pending LESENSE interrupt flags.
 

Macros

#define LESENSE_NUM_DECODER_STATES   (_LESENSE_DECSTATE_DECSTATE_MASK + 1)
 Number of decoder states supported by current device.
 
#define LESENSE_NUM_CHANNELS   16
 Number of LESENSE channels.
 
#define LESENSE_CORECTRL_DESC_DEFAULT
 Default configuration for LESENSE_CtrlDesc_TypeDef structure.
 
#define LESENSE_TIMECTRL_DESC_DEFAULT
 Default configuration for LESENSE_TimeCtrlDesc_TypeDef structure.
 
#define LESENSE_PERCTRL_DESC_DEFAULT
 Default configuration for LESENSE_PerCtrl_TypeDef structure.
 
#define LESENSE_DECCTRL_DESC_DEFAULT
 Default configuration for LESENSE_PerCtrl_TypeDef structure.
 
#define LESENSE_INIT_DEFAULT
 Default configuration for LESENSE_Init_TypeDef structure.
 
#define LESENSE_CH_CONF_DEFAULT
 Default configuration for the scan channel.
 
#define LESENSE_SCAN_CONF_DEFAULT
 Default configuration for all the sensor channels.
 
#define LESENSE_ALTEX_CH_CONF_DEFAULT
 Default configuration for the alternate excitation channel.
 
#define LESENSE_ALTEX_CONF_DEFAULT
 Default configuration for all the alternate excitation channels.
 
#define LESENSE_ST_CONF_DEFAULT
 Default configuration for the decoder state condition.
 
#define LESENSE_DECODER_CONF_DEFAULT
 Default configuration for all decoder states.
 

Enumerations

enum  LESENSE_ClkPresc_TypeDef {
  lesenseClkDiv_1 = 0,
  lesenseClkDiv_2 = 1,
  lesenseClkDiv_4 = 2,
  lesenseClkDiv_8 = 3,
  lesenseClkDiv_16 = 4,
  lesenseClkDiv_32 = 5,
  lesenseClkDiv_64 = 6,
  lesenseClkDiv_128 = 7
}
 Clock divisors for controlling the prescaling factor of the period counter.
 
enum  LESENSE_ScanMode_TypeDef {
  lesenseScanStartPeriodic = LESENSE_CTRL_SCANMODE_PERIODIC,
  lesenseScanStartOneShot = LESENSE_CTRL_SCANMODE_ONESHOT,
  lesenseScanStartPRS = LESENSE_CTRL_SCANMODE_PRS
}
 Scan modes.
 
enum  LESENSE_PRSSel_TypeDef {
  lesensePRSCh0 = 0,
  lesensePRSCh1 = 1,
  lesensePRSCh2 = 2,
  lesensePRSCh3 = 3,
  lesensePRSCh4 = 4,
  lesensePRSCh5 = 5,
  lesensePRSCh6 = 6,
  lesensePRSCh7 = 7,
  lesensePRSCh8 = 8,
  lesensePRSCh9 = 9,
  lesensePRSCh10 = 10,
  lesensePRSCh11 = 11
}
 PRS sources.
 
enum  LESENSE_AltExMap_TypeDef {
  lesenseAltExMapALTEX = _LESENSE_CTRL_ALTEXMAP_ALTEX,
  lesenseAltExMapCH = _LESENSE_CTRL_ALTEXMAP_CH
}
 Locations of the alternate excitation function.
 
enum  LESENSE_BufTrigLevel_TypeDef {
  lesenseBufTrigHalf = LESENSE_CTRL_BUFIDL_HALFFULL,
  lesenseBufTrigFull = LESENSE_CTRL_BUFIDL_FULL
}
 Result buffer interrupt and DMA trigger levels.
 
enum  LESENSE_DMAWakeUp_TypeDef {
  lesenseDMAWakeUpDisable = LESENSE_CTRL_DMAWU_DISABLE,
  lesenseDMAWakeUpBufValid = LESENSE_CTRL_DMAWU_BUFDATAV,
  lesenseDMAWakeUpBufLevel = LESENSE_CTRL_DMAWU_BUFLEVEL
}
 Modes of operation for DMA wakeup from EM2.
 
enum  LESENSE_BiasMode_TypeDef {
  lesenseBiasModeDutyCycle = LESENSE_BIASCTRL_BIASMODE_DUTYCYCLE,
  lesenseBiasModeHighAcc = LESENSE_BIASCTRL_BIASMODE_HIGHACC,
  lesenseBiasModeDontTouch = LESENSE_BIASCTRL_BIASMODE_DONTTOUCH
}
 Bias modes.
 
enum  LESENSE_ScanConfSel_TypeDef {
  lesenseScanConfDirMap = LESENSE_CTRL_SCANCONF_DIRMAP,
  lesenseScanConfInvMap = LESENSE_CTRL_SCANCONF_INVMAP,
  lesenseScanConfToggle = LESENSE_CTRL_SCANCONF_TOGGLE,
  lesenseScanConfDecDef = LESENSE_CTRL_SCANCONF_DECDEF
}
 Scan configuration.
 
enum  LESENSE_ControlDACData_TypeDef {
  lesenseDACIfData = _LESENSE_PERCTRL_DACCH0DATA_DACDATA,
  lesenseThres = _LESENSE_PERCTRL_DACCH0DATA_THRES
}
 DAC CHx data control configuration.
 
enum  LESENSE_ControlACMP_TypeDef {
  lesenseACMPModeDisable = _LESENSE_PERCTRL_ACMP0MODE_DISABLE,
  lesenseACMPModeMux = _LESENSE_PERCTRL_ACMP0MODE_MUX,
  lesenseACMPModeMuxThres = _LESENSE_PERCTRL_ACMP0MODE_MUXTHRES
}
 ACMPx control configuration.
 
enum  LESENSE_WarmupMode_TypeDef {
  lesenseWarmupModeNormal = LESENSE_PERCTRL_WARMUPMODE_NORMAL,
  lesenseWarmupModeACMP = LESENSE_PERCTRL_WARMUPMODE_KEEPACMPWARM,
  lesenseWarmupModeDAC = LESENSE_PERCTRL_WARMUPMODE_KEEPDACWARM,
  lesenseWarmupModeKeepWarm = LESENSE_PERCTRL_WARMUPMODE_KEEPACMPDACWARM
}
 Warm up modes.
 
enum  LESENSE_DecInput_TypeDef {
  lesenseDecInputSensorSt = LESENSE_DECCTRL_INPUT_SENSORSTATE,
  lesenseDecInputPRS = LESENSE_DECCTRL_INPUT_PRS
}
 Decoder input source configuration.
 
enum  LESENSE_ChSampleMode_TypeDef {
  lesenseSampleModeCounter = 0x0 << _LESENSE_CH_INTERACT_SAMPLE_SHIFT,
  lesenseSampleModeACMP = LESENSE_CH_INTERACT_SAMPLE_ACMP,
  lesenseSampleModeADC = LESENSE_CH_INTERACT_SAMPLE_ADC,
  lesenseSampleModeADCDiff = LESENSE_CH_INTERACT_SAMPLE_ADCDIFF
}
 Compare source selection for sensor sampling.
 
enum  LESENSE_ChIntMode_TypeDef {
  lesenseSetIntNone = LESENSE_CH_INTERACT_SETIF_NONE,
  lesenseSetIntLevel = LESENSE_CH_INTERACT_SETIF_LEVEL,
  lesenseSetIntPosEdge = LESENSE_CH_INTERACT_SETIF_POSEDGE,
  lesenseSetIntNegEdge = LESENSE_CH_INTERACT_SETIF_NEGEDGE,
  lesenseSetIntBothEdges = LESENSE_CH_INTERACT_SETIF_BOTHEDGES
}
 Interrupt generation setup for CHx interrupt flag.
 
enum  LESENSE_ChPinExMode_TypeDef {
  lesenseChPinExDis = LESENSE_CH_INTERACT_EXMODE_DISABLE,
  lesenseChPinExHigh = LESENSE_CH_INTERACT_EXMODE_HIGH,
  lesenseChPinExLow = LESENSE_CH_INTERACT_EXMODE_LOW,
  lesenseChPinExDACOut = LESENSE_CH_INTERACT_EXMODE_DACOUT
}
 Channel pin mode for the excitation phase of the scan sequence.
 
enum  LESENSE_ChPinIdleMode_TypeDef {
  lesenseChPinIdleDis = _LESENSE_IDLECONF_CH0_DISABLE,
  lesenseChPinIdleHigh = _LESENSE_IDLECONF_CH0_HIGH,
  lesenseChPinIdleLow = _LESENSE_IDLECONF_CH0_LOW,
  lesenseChPinIdleDACC = _LESENSE_IDLECONF_CH0_DAC
}
 Channel pin mode for the idle phase of scan sequence.
 
enum  LESENSE_ChClk_TypeDef {
  lesenseClkLF = _LESENSE_CH_INTERACT_EXCLK_LFACLK,
  lesenseClkHF = _LESENSE_CH_INTERACT_EXCLK_AUXHFRCO
}
 Clock used for excitation and sample delay timing.
 
enum  LESENSE_ChCompMode_TypeDef {
  lesenseCompModeLess = LESENSE_CH_EVAL_COMP_LESS,
  lesenseCompModeGreaterOrEq = LESENSE_CH_EVAL_COMP_GE
}
 Compare modes for counter comparison.
 
enum  LESENSE_ChEvalMode_TypeDef {
  lesenseEvalModeThreshold = _LESENSE_CH_EVAL_MODE_THRES,
  lesenseEvalModeSlidingWindow = _LESENSE_CH_EVAL_MODE_SLIDINGWIN,
  lesenseEvalModeStepDetection = _LESENSE_CH_EVAL_MODE_STEPDET
}
 Sensor evaluation modes.
 
enum  LESENSE_AltExPinIdle_TypeDef {
  lesenseAltExPinIdleDis = _LESENSE_ALTEXCONF_IDLECONF0_DISABLE,
  lesenseAltExPinIdleHigh = _LESENSE_ALTEXCONF_IDLECONF0_HIGH,
  lesenseAltExPinIdleLow = _LESENSE_ALTEXCONF_IDLECONF0_LOW
}
 Idle phase configuration of the alternate excitation channels.
 
enum  LESENSE_StTransAct_TypeDef {
  lesenseTransActNone = LESENSE_ST_TCONFA_PRSACT_NONE,
  lesenseTransActPRS0 = LESENSE_ST_TCONFA_PRSACT_PRS0,
  lesenseTransActPRS1 = LESENSE_ST_TCONFA_PRSACT_PRS1,
  lesenseTransActPRS01 = LESENSE_ST_TCONFA_PRSACT_PRS01,
  lesenseTransActPRS2 = LESENSE_ST_TCONFA_PRSACT_PRS2,
  lesenseTransActPRS02 = LESENSE_ST_TCONFA_PRSACT_PRS02,
  lesenseTransActPRS12 = LESENSE_ST_TCONFA_PRSACT_PRS12,
  lesenseTransActPRS012 = LESENSE_ST_TCONFA_PRSACT_PRS012,
  lesenseTransActUp = LESENSE_ST_TCONFA_PRSACT_UP,
  lesenseTransActDown = LESENSE_ST_TCONFA_PRSACT_DOWN,
  lesenseTransActUpAndPRS2 = LESENSE_ST_TCONFA_PRSACT_UPANDPRS2,
  lesenseTransActDownAndPRS2 = LESENSE_ST_TCONFA_PRSACT_DOWNANDPRS2
}
 Transition action modes.
 

Function Documentation

◆ LESENSE_Init()

void LESENSE_Init ( const LESENSE_Init_TypeDef init,
bool  reqReset 
)

Initialize the LESENSE module.

This function configures the main parameters of the LESENSE interface. See the initialization parameter type definition (LESENSE_Init_TypeDef) for more details.

Note
LESENSE_Init() is designed to initialize LESENSE once in an operation cycle. Be aware of the effects of reconfiguration if using this function from multiple sources in your code. This function has not been designed to be re-entrant. Requesting reset by setting reqReset to true is required in each reset or power-on cycle to configure the default values of the RAM mapped LESENSE registers. Notice that GPIO pins used by the LESENSE module must be properly configured by the user explicitly for the LESENSE to work as intended. (When configuring pins, one should remember to consider the sequence of configuration to avoid unintended pulses/glitches on output pins.)
Parameters
[in]initThe LESENSE initialization structure.
[in]reqResetRequest to call LESENSE_Reset() first to initialize all LESENSE registers with default values.

◆ LESENSE_ScanFreqSet()

uint32_t LESENSE_ScanFreqSet ( uint32_t  refFreq,
uint32_t  scanFreq 
)

Set the scan frequency for periodic scanning.

This function only applies to LESENSE if a period counter is used as a trigger for scan start. The calculation is based on the following formula: Fscan = LFACLKles / ((1+PCTOP)*2^PCPRESC)

Note
Note that the calculation does not necessarily result in the requested scan frequency due to integer division. Check the return value for the resulted scan frequency.
Parameters
[in]refFreqSelect reference LFACLK clock frequency in Hz. If set to 0, the current clock frequency is being used as a reference.
[in]scanFreqSet the desired scan frequency in Hz.
Returns
Frequency in Hz calculated and set by this function. Users can use this to compare the requested and set values.

◆ LESENSE_ScanModeSet()

void LESENSE_ScanModeSet ( LESENSE_ScanMode_TypeDef  scanMode,
bool  start 
)

Set scan mode of the LESENSE channels.

This function configures how the scan start is triggered. It can be used for re-configuring the scan mode while running the application but it is also used by LESENSE_Init() for initialization.

Note
Users can configure the scan mode by LESENSE_Init() function, but only with a significant overhead. This simple function serves the purpose of controlling this parameter after the channel has been configured. Be aware of the effects of the non-atomic Read-Modify-Write cycle.
Parameters
[in]scanModeSelect the location to map LESENSE alternate excitation channels.
  • lesenseScanStartPeriodic - A new scan is started each time the period counter overflows.
  • lesenseScanStartOneShot - A single scan is performed when LESENSE_ScanStart() is called.
  • lesenseScanStartPRS - A new scan is triggered by pulse on the PRS channel.
[in]startIf true, LESENSE_ScanStart() is immediately issued after configuration.

◆ LESENSE_StartDelaySet()

void LESENSE_StartDelaySet ( uint8_t  startDelay)

Set the start delay of the sensor interaction on each channel.

This function sets the start delay of the sensor interaction on each channel. It can be used for adjusting the start delay while running the application but it is also used by LESENSE_Init() for initialization.

Note
Users can configure the start delay by LESENSE_Init() function, but only with a significant overhead. This simple function serves the purpose of controlling this parameter after the channel has been configured. Be aware of the effects of the non-atomic Read-Modify-Write cycle.
Parameters
[in]startDelayA number of LFACLK cycles to delay. A valid range: 0-3 (2 bit).

◆ LESENSE_ClkDivSet()

void LESENSE_ClkDivSet ( LESENSE_ChClk_TypeDef  clk,
LESENSE_ClkPresc_TypeDef  clkDiv 
)

Set the clock division for LESENSE timers.

Use this function to configure the clock division for the LESENSE timers used for excitation timing. The division setting is global but the clock source can be selected for each channel using LESENSE_ChannelConfig() function. See documentation for more details.

Note
If AUXHFRCO is used for excitation timing, LFACLK can't exceed 500 kHz. LFACLK can't exceed 50 kHz if the ACMP threshold level (ACMPTHRES) is not equal for all channels.
Parameters
[in]clkSelect the clock to prescale.
  • lesenseClkHF - set AUXHFRCO clock divisor for HF timer.
  • lesenseClkLF - set LFACLKles clock divisor for LF timer.
[in]clkDivThe clock divisor value. A valid range depends on the clk value.

◆ LESENSE_ChannelAllConfig()

void LESENSE_ChannelAllConfig ( const LESENSE_ChAll_TypeDef confChAll)

Configure all (16) LESENSE sensor channels.

This function configures all sensor channels of the LESENSE interface. See the configuration parameter type definition (LESENSE_ChAll_TypeDef) for more details.

Note
Channels can be configured individually using LESENSE_ChannelConfig() function. Notice that pins used by the LESENSE module must be properly configured by the user explicitly for LESENSE to work as intended. (When configuring pins, consider the sequence of the configuration to avoid unintended pulses/glitches on output pins.)
Parameters
[in]confChAllA configuration structure for all (16) LESENSE sensor channels.

◆ LESENSE_ChannelConfig()

void LESENSE_ChannelConfig ( const LESENSE_ChDesc_TypeDef confCh,
uint32_t  chIdx 
)

Configure a single LESENSE sensor channel.

This function configures a single sensor channel of the LESENSE interface. See the configuration parameter type definition (LESENSE_ChDesc_TypeDef) for more details.

Note
This function has been designed to minimize the effects of sensor channel reconfiguration while LESENSE is in operation. However, be aware of these effects and the right timing to call this function. Parameter useAltEx must be true in the channel configuration to use alternate excitation pins.
Parameters
[in]confChA configuration structure for a single LESENSE sensor channel.
[in]chIdxA channel index to configure (0-15).

◆ LESENSE_AltExConfig()

void LESENSE_AltExConfig ( const LESENSE_ConfAltEx_TypeDef confAltEx)

Configure the LESENSE alternate excitation modes.

This function configures the alternate excitation channels of the LESENSE interface. See the configuration parameter type definition (LESENSE_ConfAltEx_TypeDef) for more details.

Note
The useAltEx parameter must be true in the channel configuration structure (LESENSE_ChDesc_TypeDef) to use alternate excitation pins on the channel.
Parameters
[in]confAltExA configuration structure for LESENSE alternate excitation pins.

◆ LESENSE_ChannelEnable()

void LESENSE_ChannelEnable ( uint8_t  chIdx,
bool  enaScanCh,
bool  enaPin 
)

Enable/disable LESENSE scan channel and the pin assigned to it.

Use this function to enable/disable a selected LESENSE scan channel and the pin assigned to it.

Note
Users can enable/disable scan channels and the channel pin with the LESENSE_ChannelConfig() function, but only with a significant overhead. This simple function controls these parameters after the channel has been configured.
Parameters
[in]chIdxAn identifier of the scan channel. A valid range: 0-15.
[in]enaScanChEnable/disable the selected scan channel by setting this parameter to true/false respectively.
[in]enaPinEnable/disable the pin assigned to the channel selected by chIdx.

◆ LESENSE_ChannelEnableMask()

void LESENSE_ChannelEnableMask ( uint16_t  chMask,
uint16_t  pinMask 
)

Enable/disable LESENSE scan channel and the pin assigned to it.

Use this function to enable/disable LESENSE scan channels and the pins assigned to them using a mask.

Note
Users can enable/disable scan channels and channel pins by using the LESENSE_ChannelAllConfig() function, but only with a significant overhead. This simple function controls these parameters after the channel has been configured.
Parameters
[in]chMaskSet the corresponding bit to 1 to enable, 0 to disable the selected scan channel.
[in]pinMaskSet the corresponding bit to 1 to enable, 0 to disable the pin on selected channel.

◆ LESENSE_ChannelTimingSet()

void LESENSE_ChannelTimingSet ( uint8_t  chIdx,
uint8_t  exTime,
uint8_t  sampleDelay,
uint16_t  measDelay 
)

Set LESENSE channel timing parameters.

Use this function to set timing parameters on a selected LESENSE channel.

Note
Users can configure the channel timing parameters with the LESENSE_ChannelConfig() function, but only with a significant overhead. This simple function controls these parameters after the channel has been configured.
Parameters
[in]chIdxAn identifier of the scan channel. A valid range is 0-15.
[in]exTimeAn excitation time on chIdx. The excitation will last exTime+1 excitation clock cycles. A valid range is 0-63 (6 bits).
[in]sampleDelaySample delay on chIdx. Sampling will occur after sampleDelay+1 sample clock cycles. A valid range is 0-127 (7 bits).
[in]measDelayA measure delay on chIdx. Sensor measuring is delayed for measDelay+1 excitation clock cycles. A valid range is 0-127 (7 bits).

◆ LESENSE_ChannelThresSet()

void LESENSE_ChannelThresSet ( uint8_t  chIdx,
uint16_t  acmpThres,
uint16_t  cntThres 
)

Set LESENSE channel threshold parameters.

Use this function to set threshold parameters on a selected LESENSE channel.

Note
Users can configure the channel threshold parameters with the LESENSE_ChannelConfig() function, but only with a significant overhead. This simple function serves controls these parameters after the channel has been configured.
Parameters
[in]chIdxAn identifier of the scan channel. A valid range is 0-15.
[in]acmpThresACMP threshold.
  • If perCtrl.dacCh0Data or perCtrl.dacCh1Data is set to lesenseDACIfData, acmpThres defines the 12-bit DAC data in the corresponding data register of the DAC interface (DACn_CH0DATA and DACn_CH1DATA). In this case, the valid range is 0-4095 (12 bits).
  • If perCtrl.dacCh0Data or perCtrl.dacCh1Data is set to lesenseACMPThres, acmpThres defines the 6-bit Vdd scaling factor of ACMP negative input (VDDLEVEL in ACMP_INPUTSEL register). In this case, the valid range is 0-63 (6 bits).
[in]cntThresA decision threshold for counter comparison. A valid range is 0-65535 (16 bits).

◆ LESENSE_ChannelSlidingWindow()

void LESENSE_ChannelSlidingWindow ( uint8_t  chIdx,
uint32_t  windowSize,
uint32_t  initValue 
)

Configure a Sliding Window evaluation mode for a specific channel.

This function will configure the evaluation mode, the initial sensor measurement (COMPTHRES), and the window size. For other channel-related configuration, see the LESENSE_ChannelConfig() function.

Warning
Note that the step size and window size configuration are global to all LESENSE channels and use the same register field in the hardware. This means that any windowSize configuration passed to this function will apply for all channels and override all other stepSize/windowSize configurations.
Parameters
[in]chIdxAn identifier of the scan channel. A valid range is 0-15.
[in]windowSizeA window size to be used on all channels.
[in]initValueThe initial sensor value for the channel.

◆ LESENSE_ChannelStepDetection()

void LESENSE_ChannelStepDetection ( uint8_t  chIdx,
uint32_t  stepSize,
uint32_t  initValue 
)

Configure the step detection evaluation mode for a specific channel.

This function will configure the evaluation mode, the initial sensor measurement (COMPTHRES) and the window size. For other channel-related configuration, see the LESENSE_ChannelConfig() function.

Warning
Note that the step size and window size configuration are global to all LESENSE channels and use the same register field in the hardware. This means that any stepSize configuration passed to this function will apply for all channels and override all other stepSize/windowSize configurations.
Parameters
[in]chIdxAn identifier of the scan channel. A valid range is 0-15.
[in]stepSizeA step size to be used on all channels.
[in]initValueThe initial sensor value for the channel.

◆ LESENSE_WindowSizeSet()

void LESENSE_WindowSizeSet ( uint32_t  windowSize)

Set the window size for all LESENSE channels.

The window size is used by all channels that are configured as lesenseEvalModeSlidingWindow.

Warning
The window size configuration is using the same register field as the step detection size. As a result, the window size configuration will have an effect on channels configured with the lesenseEvalModeStepDetection evaluation mode as well.
Parameters
[in]windowSizeThe window size to use for all channels.

◆ LESENSE_StepSizeSet()

void LESENSE_StepSizeSet ( uint32_t  stepSize)

Set the step size for all LESENSE channels.

The step size is configured using the same register field as used to configure window size. Therefore, calling this function will overwrite any previously configured window size as done by the LESENSE_WindowSizeSet() function.

Parameters
[in]stepSizeThe step size to use for all channels.

◆ LESENSE_DecoderStateAllConfig()

void LESENSE_DecoderStateAllConfig ( const LESENSE_DecStAll_TypeDef confDecStAll)

Configure all LESENSE decoder states.

This function configures all the decoder states of the LESENSE interface. See the configuration parameter type definition (LESENSE_DecStAll_TypeDef) for more details.

Note
Decoder states can be configured individually using LESENSE_DecoderStateConfig() function.
Parameters
[in]confDecStAllA configuration structure for all (16 or 32) LESENSE decoder states.

◆ LESENSE_DecoderStateConfig()

void LESENSE_DecoderStateConfig ( const LESENSE_DecStDesc_TypeDef confDecSt,
uint32_t  decSt 
)

Configure a single LESENSE decoder state.

This function configures a single decoder state of the LESENSE interface. See the configuration parameter type definition (LESENSE_DecStDesc_TypeDef) for more details.

Parameters
[in]confDecStA configuration structure for a single LESENSE decoder state.
[in]decStA decoder state index to configure (0-15) or (0-31) depending on the device.

◆ LESENSE_DecoderStateSet()

void LESENSE_DecoderStateSet ( uint32_t  decSt)

Set the LESENSE decoder state.

This function can be used for setting the initial state of the LESENSE decoder.

Note
Make sure the LESENSE decoder state is initialized by this function before enabling the decoder!
Parameters
[in]decStA decoder state to set as the current state. A valid range is 0-15 or 0-31, depending on the device.

◆ LESENSE_DecoderStateGet()

uint32_t LESENSE_DecoderStateGet ( void  )

Get the current state of the LESENSE decoder.

Returns
This function returns the value of the LESENSE_DECSTATE register that represents the current state of the LESENSE decoder.

◆ LESENSE_DecoderPrsOut()

void LESENSE_DecoderPrsOut ( bool  enable,
uint32_t  decMask,
uint32_t  decVal 
)

Enable or disable the PRS output from the LESENSE decoder.

Parameters
[in]enableEnable/disable the PRS output from the LESENSE decoder. True to enable and false to disable.
[in]decMaskA decoder state compare value mask.
[in]decValA decoder state comparison value.

◆ LESENSE_ScanStart()

void LESENSE_ScanStart ( void  )

Start scanning sensors.

Note
This function will wait for any pending previous write operation to the CMD register to complete before accessing the CMD register. It will also wait for the write operation to the CMD register to complete before returning. Each write operation to the CMD register may take up to 3 LF clock cycles, so expect some delay. The user may implement a separate function to write multiple command bits in the CMD register in one single operation to optimize an application.

◆ LESENSE_ScanStop()

void LESENSE_ScanStop ( void  )

Stop scanning sensors.

Note
This function will wait for any pending previous write operation to the CMD register to complete before accessing the CMD register. It will also wait for the write operation to the CMD register to complete before returning. Each write operation to the CMD register may take up to 3 LF clock cycles, so the user should expect some delay. The user may implement a separate function to write multiple command bits in the CMD register in one single operation in order to optimize an application.
If issued during a scan, the command takes effect after scan completion.

◆ LESENSE_DecoderStart()

void LESENSE_DecoderStart ( void  )

Start the LESENSE decoder.

Note
This function will wait for any pending previous write operation to the CMD register to complete before accessing the CMD register. It will also wait for the write operation to the CMD register to complete before returning. Each write operation to the CMD register may take up to 3 LF clock cycles, so expect some delay. The user may implement a separate function to write multiple command bits in the CMD register in one single operation to optimize an application.

◆ LESENSE_ResultBufferClear()

void LESENSE_ResultBufferClear ( void  )

Clear the result buffer.

Note
This function will wait for any pending previous write operation to the CMD register to complete before accessing the CMD register. It will also wait for the write operation to the CMD register to complete before returning. Each write operation to the CMD register may take up to 3 LF clock cycles, so expect some delay. The user may implement a separate function to write multiple command bits in the CMD register in one single operation to optimize an application.

◆ LESENSE_Reset()

void LESENSE_Reset ( void  )

Reset the LESENSE module.

Use this function to reset LESENSE registers.

Note
Resetting LESENSE registers is required in each reset or power-on cycle to configure the default values of the RAM mapped LESENSE registers. LESENSE_Reset() can be called on initialization by setting the reqReset parameter to true in LESENSE_Init(). Starting from Series 2 Config 3 (xG23 and higher), this function leaves LESENSE in the disabled state.

◆ LESENSE_DecoderStop()

void LESENSE_DecoderStop ( void  )
inline

Stop LESENSE decoder.

Disables LESENSE decoder by setting the command to LESENSE_DECCTRL register.

◆ LESENSE_StatusGet()

uint32_t LESENSE_StatusGet ( void  )
inline

Get the current status of LESENSE.

Returns
Returns the value of the LESENSE_STATUS register that contains the OR combination of the following status bits for EFR series 0/1:
  • LESENSE_STATUS_BUFDATAV - Result data valid. Set when data is available in result buffer. Cleared when buffer is empty.
  • LESENSE_STATUS_BUFFULL - Result buffer full. Set when result buffer is full.
  • LESENSE_STATUS_BUFHALFFULL - Result buffer half full. Set when result buffer is half full.
  • LESENSE_STATUS_RUNNING - LESENSE is active.
  • LESENSE_STATUS_SCANACTIVE - LESENSE is currently interfacing sensors.
The OR combination of the following status bits for EFR series 2:
  • LESENSE_STATUS_RESFIFOV - Result Fifo valid. Set when data is available in result Fifo. Cleared when Fifo is empty.
  • LESENSE_STATUS_RESFIFOFULL - Result Fifo full. Set when result Fifo is full.
  • LESENSE_STATUS_RUNNING - LESENSE is active.
  • LESENSE_STATUS_SCANACTIVE - LESENSE is currently interfacing sensors.
  • LESENSE_STATUS_FLUSHING - Fifo flushing
  • LESENSE_STATUS_READBUSY - Fifo Read busy

◆ LESENSE_StatusWait()

void LESENSE_StatusWait ( uint32_t  flag)
inline

Wait until status of LESENSE is equal to what was requested.

Polls LESENSE_STATUS register and waits until requested combination of flags are set.

Parameters
[in]flagThe OR combination of the following status bits for EFR series 0/1:
  • LESENSE_STATUS_BUFDATAV - Result data valid. Set when data is available in result buffer. Cleared when buffer is empty.
  • LESENSE_STATUS_BUFHALFFULL - Result buffer half full. Set when result buffer is half full.
  • LESENSE_STATUS_BUFFULL - Result buffer full. Set when result buffer is full.
  • LESENSE_STATUS_RUNNING - LESENSE is active.
  • LESENSE_STATUS_SCANACTIVE - LESENSE is currently interfacing sensors.
  • LESENSE_STATUS_DACACTIVE - The DAC interface is currently active.
The OR combination of the following status bits for EFR series 2:
  • LESENSE_STATUS_RESFIFOV - Result FIFO valid. Set when data is available in result FIFO. Cleared when FIFO is empty.
  • LESENSE_STATUS_RESFIFOFULL - Result FIFO full. Set when result FIFO is full.
  • LESENSE_STATUS_RUNNING - LESENSE is active.
  • LESENSE_STATUS_SCANACTIVE - LESENSE is currently interfacing sensors.
  • LESENSE_STATUS_FLUSHING - FIFO flushing
  • LESENSE_STATUS_READBUSY - FIFO Read busy

◆ LESENSE_ChannelActiveGet()

uint32_t LESENSE_ChannelActiveGet ( void  )
inline

Get the currently active channel index.

Returns
Returns the value of the LESENSE_CHINDEX register that contains the index of currently active channel (0-15).

◆ LESENSE_ScanResultGet()

uint32_t LESENSE_ScanResultGet ( void  )
inline

Get the latest scan comparison result (1 bit / channel).

Returns
Returns the value of the LESENSE_SCANRES register that contains the comparison result of last scan on all channels. Bit x is set if a comparison triggered on channel x, which means that LESENSE counter met the comparison criteria set in LESENSE_CHx_EVAL by COMPMODE and CNTTHRES.

◆ LESENSE_ScanResultDataGet()

uint32_t LESENSE_ScanResultDataGet ( void  )
inline

Get the oldest unread data from the result buffer.

Note
Make sure that the STORERES bit is set in LESENSE_CHx_EVAL, or the STRSCANRES bit is set in LESENSE_CTRL; otherwise, returns the undefined value.
Returns
Returns the value of LESENSE_RESDATA register that contains the oldest unread counter result from result buffer.

◆ LESENSE_ScanResultDataBufferGet()

uint32_t LESENSE_ScanResultDataBufferGet ( uint32_t  idx)
inline

Get data from the result data buffer.

Note
Make sure that the STORERES bit is set in LESENSE_CHx_EVAL, or the STRSCANRES bit is set in LESENSE_CTRL; otherwise, returns the undefined value.
Parameters
[in]idxResult data buffer index. Valid range: 0-15.
Returns
Returns the selected word from the result data buffer.

◆ LESENSE_SensorStateGet()

uint32_t LESENSE_SensorStateGet ( void  )
inline

Get the current state of the LESENSE sensor.

Returns
Returns the value of LESENSE_SENSORSTATE register that represents the current state of the LESENSE sensor.

◆ LESENSE_IntClear()

void LESENSE_IntClear ( uint32_t  flags)
inline

Clear one or more pending LESENSE interrupts.

Parameters
[in]flagsPending LESENSE interrupt sources to clear. Use a set of interrupt flags OR-ed together to clear multiple interrupt sources of LESENSE module (LESENSE_IF_nnn).

◆ LESENSE_IntEnable()

void LESENSE_IntEnable ( uint32_t  flags)
inline

Enable one or more LESENSE interrupts.

Parameters
[in]flagsLESENSE interrupt sources to enable. Use a set of interrupt flags OR-ed together to enable multiple interrupt sources of LESENSE module (LESENSE_IF_nnn).

◆ LESENSE_IntDisable()

void LESENSE_IntDisable ( uint32_t  flags)
inline

Disable one or more LESENSE interrupts.

Parameters
[in]flagsLESENSE interrupt sources to disable. Use a set of interrupt flags OR-ed together to disable multiple interrupt sources of LESENSE module (LESENSE_IF_nnn).

◆ LESENSE_IntSet()

void LESENSE_IntSet ( uint32_t  flags)
inline

Set one or more pending LESENSE interrupts from SW.

Parameters
[in]flagsLESENSE interrupt sources to set to pending. Use a set of interrupt flags OR-ed together to set multiple interrupt sources of LESENSE module (LESENSE_IFS_nnn).

◆ LESENSE_IntGet()

uint32_t LESENSE_IntGet ( void  )
inline

Get pending LESENSE interrupt flags.

Note
Event bits are not cleared by the use of this function.
Returns
Pending LESENSE interrupt sources. The OR combination of valid interrupt flags of the LESENSE module (LESENSE_IF_nnn).

◆ LESENSE_IntGetEnabled()

uint32_t LESENSE_IntGetEnabled ( void  )
inline

Get enabled and pending LESENSE interrupt flags.

Useful for handling more interrupt sources in the same interrupt handler.

Note
Event bits are not cleared by the use of this function.
Returns
Pending and enabled LESENSE interrupt sources. Return value is the bitwise AND combination of
  • the OR combination of enabled interrupt sources in LESENSE_IEN_nnn register (LESENSE_IEN_nnn) and
  • the OR combination of valid interrupt flags of LESENSE module (LESENSE_IF_nnn).

Macro Definition Documentation

◆ LESENSE_NUM_DECODER_STATES

#define LESENSE_NUM_DECODER_STATES   (_LESENSE_DECSTATE_DECSTATE_MASK + 1)

Number of decoder states supported by current device.

◆ LESENSE_NUM_CHANNELS

#define LESENSE_NUM_CHANNELS   16

Number of LESENSE channels.

◆ LESENSE_CORECTRL_DESC_DEFAULT

#define LESENSE_CORECTRL_DESC_DEFAULT
Value:
{ \
lesenseScanStartPeriodic,/* Start new scan each time the period counter overflows. */ \
lesensePRSCh0, /* Default PRS channel is selected. */ \
lesenseScanConfDirMap, /* Direct mapping SCANCONF register usage strategy. */ \
false, /* Do not invert ACMP0 output. */ \
false, /* Do not invert ACMP1 output. */ \
false, /* Disable dual sampling. */ \
true, /* Store scan result after each scan. */ \
true, /* Overwrite result buffer register even if it is full. */ \
lesenseBufTrigHalf, /* Trigger interrupt and DMA request if result buffer is half full. */ \
lesenseDMAWakeUpDisable, /* Do not wake up on DMA from EM2. */ \
lesenseBiasModeDontTouch,/* Do not touch bias configuration. */ \
true /* Keep LESENSE running in debug mode. */ \
}

Default configuration for LESENSE_CtrlDesc_TypeDef structure.

◆ LESENSE_TIMECTRL_DESC_DEFAULT

#define LESENSE_TIMECTRL_DESC_DEFAULT
Value:
{ \
0U, /* No sensor interaction delay. */ \
false /* Do not delay the AUXHFRCO startup. */ \
}

Default configuration for LESENSE_TimeCtrlDesc_TypeDef structure.

◆ LESENSE_PERCTRL_DESC_DEFAULT

#define LESENSE_PERCTRL_DESC_DEFAULT
Value:
{ \
lesenseDACIfData, /* DAC channel 0 data is defined by DAC_CH0DATA register. */ \
lesenseDACIfData, /* DAC channel 1 data is defined by DAC_CH1DATA register. */ \
lesenseACMPModeMuxThres, /* LESENSE controls input mux and threshold value of ACMP0. */ \
lesenseACMPModeMuxThres, /* LESENSE controls input mux and threshold value of ACMP1. */ \
lesenseWarmupModeKeepWarm,/* Keep both ACMPs and DAC powered up when LESENSE is idle. */ \
false, /* DAC is enabled for before every channel measurement. */ \
false, /* DAC is enabled a full clock cycle before sensor interaction */ \
false, /* LESENSE does not control DAC channel 0. */ \
false /* LESENSE does not control DAC channel 1. */ \
}

Default configuration for LESENSE_PerCtrl_TypeDef structure.

◆ LESENSE_DECCTRL_DESC_DEFAULT

#define LESENSE_DECCTRL_DESC_DEFAULT
Value:
{ \
lesenseDecInputSensorSt, /* SENSORSTATE register is used as input to decoder. */ \
0U, /* State 0 is the initial state of decoder. */ \
false, /* Disable check of current state. */ \
true, /* Enable channel x % 16 interrupt on state x change. */ \
true, /* Enable decoder hysteresis on PRS0 output. */ \
true, /* Enable decoder hysteresis on PRS1 output. */ \
true, /* Enable decoder hysteresis on PRS2 output. */ \
true, /* Enable decoder hysteresis on PRS3 output. */ \
false, /* Disable count mode on decoder PRS channels 0 and 1*/ \
lesensePRSCh0, /* PRS Channel 0 as input for bit 0 of LESENSE decoder. */ \
lesensePRSCh1, /* PRS Channel 1 as input for bit 1 of LESENSE decoder. */ \
lesensePRSCh2, /* PRS Channel 2 as input for bit 2 of LESENSE decoder. */ \
lesensePRSCh3, /* PRS Channel 3 as input for bit 3 of LESENSE decoder. */ \
}

Default configuration for LESENSE_PerCtrl_TypeDef structure.

◆ LESENSE_INIT_DEFAULT

#define LESENSE_INIT_DEFAULT
Value:
{ \
.coreCtrl = LESENSE_CORECTRL_DESC_DEFAULT, /* Default core control parameters. */ \
.timeCtrl = LESENSE_TIMECTRL_DESC_DEFAULT, /* Default time control parameters. */ \
.perCtrl = LESENSE_PERCTRL_DESC_DEFAULT, /* Default peripheral control parameters. */ \
.decCtrl = LESENSE_DECCTRL_DESC_DEFAULT /* Default decoder control parameters. */ \
}

Default configuration for LESENSE_Init_TypeDef structure.

◆ LESENSE_CH_CONF_DEFAULT

#define LESENSE_CH_CONF_DEFAULT
Value:
{ \
false, /* Disable scan channel. */ \
false, /* Disable assigned pin on scan channel. */ \
false, /* Disable interrupts on channel. */ \
lesenseChPinExDis, /* Channel pin is disabled during excitation period. */ \
lesenseChPinIdleDis, /* Channel pin is disabled during idle period. */ \
false, /* Do not use alternate excitation pins for excitation. */ \
false, /* Disabled to shift results from this channel to decoder register. */ \
false, /* Disabled to invert scan result bit. */ \
false, /* Disabled to store counter value in result buffer. */ \
lesenseClkLF, /* Use LF clock for excitation timing. */ \
lesenseClkLF, /* Use LF clock for sample timing. */ \
0x00U, /* Excitation time is set to 0(+1) excitation clock cycles. */ \
0x00U, /* Sample delay is set to 0(+1) sample clock cycles. */ \
0x00U, /* Measure delay is set to 0 excitation clock cycles.*/ \
0x00U, /* ACMP threshold has been set to 0. */ \
lesenseSampleModeACMP, /* ACMP output will be used in comparison. */ \
lesenseSetIntNone, /* No interrupt is generated by the channel. */ \
0x00U, /* Counter threshold has bee set to 0x00. */ \
lesenseCompModeLess, /* Compare mode has been set to trigger interrupt on "less". */ \
lesenseEvalModeThreshold /* Evaluation mode has been set to trigger interrupt on threshold. */ \
}