/***************************************************************************//**
* @brief
* Configure all (16) LESENSE sensor channels.
*
* @details
* This function configures all the sensor channels of LESENSE interface.
* Please refer to 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, in order for the LESENSE to work as intended.
* (When configuring pins, one should remember to consider the sequence of
* configuration, in order to avoid unintended pulses/glitches on output
* pins.)
*
* @param[in] confChAll
* Configuration structure for all (16) LESENSE sensor channels.
******************************************************************************/
void LESENSE_ChannelAllConfig(LESENSE_ChAll_TypeDef const *confChAll)
{
uint32_t i;
/* Iterate through all the 16 channels */
for (i = 0U; i < 16U; ++i)
{
/* Configure scan channels. */
LESENSE_ChannelConfig(&confChAll->Ch[i], i);
}
}
/**************************************************************************//**
* @brief Sets up the ACMP
*****************************************************************************/
void setupACMP(void)
{
/* Configuration structure for ACMP */
static const ACMP_Init_TypeDef acmpInit =
{
.fullBias = false,
.halfBias = false,
.biasProg = 0x6, /* Experiment with higher value if sensor doesn't work */
.interruptOnFallingEdge = false,
.interruptOnRisingEdge = false,
.warmTime = acmpWarmTime256, /* Warmuptime should be longer than 10 micro s */
.hysteresisLevel = acmpHysteresisLevel0,
.inactiveValue = false,
.lowPowerReferenceEnabled = false,
.vddLevel = 0x00, /* Controlled by LESENSE */
.enable = false
};
/* Initialize ACMP */
ACMP_Init(ACMP0, &acmpInit);
/* Disable ACMP0 out to a pin. */
ACMP_GPIOSetup(ACMP0, 0, false, false);
/* Set up ACMP negSel to VDD, posSel is controlled by LESENSE. */
ACMP_ChannelSet(ACMP0, acmpChannelVDD, acmpChannel0);
/* LESENSE controls ACMP thus ACMP_Enable(ACMP0) should NOT be called in order
* to ensure lower current consumption. */
}
/**************************************************************************//**
* @brief Sets up the LESENSE
*****************************************************************************/
void setupLESENSE(void)
{
/* LESENSE configuration structure */
static const LESENSE_Init_TypeDef initLesense =
{
.coreCtrl = LESENSE_CORECTRL_DESC_DEFAULT,
.timeCtrl = LESENSE_TIMECTRL_DESC_DEFAULT,
.perCtrl =
{
.dacCh0Data = lesenseDACIfData,
.dacCh0ConvMode = lesenseDACConvModeDisable,
.dacCh0OutMode = lesenseDACOutModeDisable,
.dacCh1Data = lesenseDACIfData,
.dacCh1ConvMode = lesenseDACConvModeDisable,
.dacCh1OutMode = lesenseDACOutModeDisable,
.dacPresc = 0,
.dacRef = lesenseDACRefBandGap,
.acmp0Mode = lesenseACMPModeMuxThres, /* LESENSE controls the threshold value (VDDLEVEL) of ACMP0 */
.acmp1Mode = lesenseACMPModeMuxThres, /* LESENSE controls the threshold value (VDDLEVEL) of ACMP1 */
.warmupMode = lesenseWarmupModeNormal /* The analog comparators are shut down when LESENSE is idle */
},
.decCtrl = LESENSE_DECCTRL_DESC_DEFAULT
};
/* Channel configuration */
static const LESENSE_ChDesc_TypeDef initLesenseCh =
{
.enaScanCh = true, /* Enable scan on this channel */
.enaPin = false,
.enaInt = false,
.chPinExMode = lesenseChPinExHigh, /* Pin is high when excitating */
.chPinIdleMode = lesenseChPinIdleDis, /* Pin idle when channel idle */
.useAltEx = true, /* Use alternative excitation pin */
.shiftRes = true, /* Result is shifted into the decoder register */
.invRes = false,
.storeCntRes = true,
.exClk = lesenseClkHF, /* Use HF clock for excitation timing */
.sampleClk = lesenseClkHF, /* Use HF clock for sample timing */
.exTime = 0x1F, /* Clk cycles to excite emitter and decoder */
.sampleDelay = 0x1F, /* Clc cycles to wait before sampling comparator */
.measDelay = 0x00,
.acmpThres = 0x0F, /* Initial comperator threshold */
.sampleMode = lesenseSampleModeACMP,
.intMode = lesenseSetIntNone,
.cntThres = 0x0000,
.compMode = lesenseCompModeLess
};
/* Alternate excitation channels configuration */
static const LESENSE_ConfAltEx_TypeDef initAltEx =
{
.altExMap = lesenseAltExMapALTEX,
.AltEx[0] =
{
.enablePin = true,
.idleConf = lesenseAltExPinIdleDis,
.alwaysEx = true /* Connected to IR sensor */
},
.AltEx[1] =
{
.enablePin = true,
.idleConf = lesenseAltExPinIdleDis,
.alwaysEx = false /* Connected to IR LED */
}
};
/* Initialize LESENSE interface _with_ RESET. */
LESENSE_Init(&initLesense, true);
/* Configure channels */
LESENSE_ChannelConfig(&initLesenseCh, 0);
LESENSE_ChannelConfig(&initLesenseCh, 1);
/* Configure alternate excitation channels */
LESENSE_AltExConfig(&initAltEx);
/* State machine proximity sensor setup */
LESENSE_DecStDesc_TypeDef decConf =
{
.chainDesc = false,
.confA =
{
.compVal = 0x1, /* Trigger transition when scan result = compVal */
.compMask = 0xC, /* Mask out the upper two bits */
.nextState = STATE_1,
.prsAct = lesenseTransActNone,
.setInt = true
},
.confB =
{
.compVal = 0x1,
.compMask = 0xC,
.nextState = STATE_1,
.prsAct = lesenseTransActNone,
.setInt = true
}
};
