/**************************************************************************//**
* @brief Sets up the ACMP
*****************************************************************************/
static void LETOUCH_setupACMP( void )
{
/* Configuration structure for ACMP */
/* See application note document for description of the different settings. */
static const ACMP_CapsenseInit_TypeDef acmpInit =
{
.fullBias = true, //Configured according to application note
.halfBias = true, //Configured according to application note
.biasProg = 0x5, //Configured according to application note
.warmTime = acmpWarmTime512, //LESENSE uses a fixed warmup time
.hysteresisLevel = acmpHysteresisLevel5, //Configured according to application note
.resistor = acmpResistor0, //Configured according to application note
.lowPowerReferenceEnabled = false, //LP-reference can introduce glitches with captouch
.vddLevel = 0x30, //Configured according to application note
.enable = false //LESENSE enables the ACMP
};
/* Initialize ACMP in capsense mode*/
ACMP_CapsenseInit(ACMP0, &acmpInit);
ACMP_CapsenseInit(ACMP1, &acmpInit);
}
/**************************************************************************//**
* @brief Sets up the LESENSE
*****************************************************************************/
static void LETOUCH_setupLESENSE( void )
{
uint8_t i;
/* LESENSE configuration structure */
static const LESENSE_Init_TypeDef initLesense =
{
.coreCtrl =
{
.scanStart = lesenseScanStartPeriodic,
.prsSel = lesensePRSCh0,
.scanConfSel = lesenseScanConfDirMap,
.invACMP0 = false,
.invACMP1 = false,
.dualSample = false,
.storeScanRes = false,
.bufOverWr = true,
.bufTrigLevel = lesenseBufTrigHalf,
.wakeupOnDMA = lesenseDMAWakeUpDisable,
.biasMode = lesenseBiasModeDutyCycle,
.debugRun = false
},
.timeCtrl =
{
.startDelay = 0x0
},
.perCtrl =
/**************************************************************************//**
* @brief Initializes the capacative sense system.
* Capacative sensing uses two timers: TIMER0 and TIMER1 as well as ACMP.
* ACMP is set up in cap-sense (oscialltor mode).
* TIMER1 counts the number of pulses generated by ACMP_CAPSENSE.
* When TIMER0 expires it generates an interrupt.
* The number of pulses counted by TIMER1 is then stored in channelValues
*****************************************************************************/
void CAPSENSE_Init(void)
{
/* Use the default STK capacative sensing setup */
ACMP_CapsenseInit_TypeDef capsenseInit = ACMP_CAPSENSE_INIT_DEFAULT;
/* Enable TIMER0, TIMER1, ACMP_CAPSENSE and PRS clock */
CMU->HFPERCLKDIV |= CMU_HFPERCLKDIV_HFPERCLKEN;
CMU->HFPERCLKEN0 |= CMU_HFPERCLKEN0_TIMER0
| CMU_HFPERCLKEN0_TIMER1
| ACMP_CAPSENSE_CLKEN
| CMU_HFPERCLKEN0_PRS;
/* Initialize TIMER0 - Prescaler 2^9, top value 10, interrupt on overflow */
TIMER0->CTRL = TIMER_CTRL_PRESC_DIV512;
TIMER0->TOP = 10;
TIMER0->IEN = TIMER_IEN_OF;
TIMER0->CNT = 0;
/* Initialize TIMER1 - Prescaler 2^10, clock source CC1, top value 0xFFFF */
TIMER1->CTRL = TIMER_CTRL_PRESC_DIV1024 | TIMER_CTRL_CLKSEL_CC1;
TIMER1->TOP = 0xFFFF;
/*Set up TIMER1 CC1 to trigger on PRS channel 0 */
TIMER1->CC[1].CTRL = TIMER_CC_CTRL_MODE_INPUTCAPTURE /* Input capture */
| TIMER_CC_CTRL_PRSSEL_PRSCH0 /* PRS channel 0 */
| TIMER_CC_CTRL_INSEL_PRS /* PRS input selected */
| TIMER_CC_CTRL_ICEVCTRL_RISING /* PRS on rising edge */
| TIMER_CC_CTRL_ICEDGE_BOTH; /* PRS on rising edge */
/*Set up PRS channel 0 to trigger on ACMP1 output*/
PRS->CH[0].CTRL = PRS_CH_CTRL_EDSEL_POSEDGE /* Posedge triggers action */
| PRS_CH_CTRL_SOURCESEL_ACMP_CAPSENSE /* PRS source */
| PRS_CH_CTRL_SIGSEL_ACMPOUT_CAMPSENSE; /* PRS source */
/* Set up ACMP1 in capsense mode */
ACMP_CapsenseInit(ACMP_CAPSENSE, &capsenseInit);
/* Enable TIMER0 interrupt */
NVIC_EnableIRQ(TIMER0_IRQn);
}
/**************************************************************************//**
* @brief Setup the ACMP
*****************************************************************************/
void CAPLESENSE_setupACMP(void)
{
/* ACMP capsense configuration constant table. */
static const ACMP_CapsenseInit_TypeDef initACMP =
{
.fullBias = false,
.halfBias = false,
.biasProg = 0x7,
.warmTime = acmpWarmTime512,
.hysteresisLevel = acmpHysteresisLevel7,
.resistor = acmpResistor0,
.lowPowerReferenceEnabled = false,
.vddLevel = 0x3D,
.enable = false
};
/* Configure ACMP locations, ACMP output to pin disabled. */
ACMP_GPIOSetup(ACMP0, 0, false, false);
ACMP_GPIOSetup(ACMP1, 0, false, false);
/* Initialize ACMPs in capacitive sense mode. */
ACMP_CapsenseInit(ACMP0, &initACMP);
ACMP_CapsenseInit(ACMP1, &initACMP);
/* Don't enable ACMP, LESENSE controls it! */
}
/**************************************************************************//**
* @brief Setup the LESENSE for capavitive sensing
* @param sleep
* If true, go into sleep mode.
*****************************************************************************/
void CAPLESENSE_setupLESENSE(bool sleep)
{
uint8_t i;
static bool init = true;
/* Array for storing the calibration values. */
static uint16_t capsenseCalibrateVals[4];
/* LESENSE channel configuration constant table in sense mode. */
static const LESENSE_ChAll_TypeDef initChsSense = LESENSE_CAPSENSE_SCAN_CONF_SENSE;
/* LESENSE channel configuration constant table in sleep mode. */
static const LESENSE_ChAll_TypeDef initChsSleep = LESENSE_CAPSENSE_SCAN_CONF_SLEEP;
/* LESENSE central configuration constant table. */
static const LESENSE_Init_TypeDef initLESENSE =
{
.coreCtrl =
{
.scanStart = lesenseScanStartPeriodic,
.prsSel = lesensePRSCh0,
.scanConfSel = lesenseScanConfDirMap,
.invACMP0 = false,
.invACMP1 = false,
.dualSample = false,
.storeScanRes = false,
.bufOverWr = true,
.bufTrigLevel = lesenseBufTrigHalf,
.wakeupOnDMA = lesenseDMAWakeUpDisable,
.biasMode = lesenseBiasModeDutyCycle,
.debugRun = false
},
.timeCtrl =
{
.startDelay = 0U
},
.perCtrl =
