void capElectrodeWakeableSleep(int electrodeIdx)
{
Electrode* wakeElectrode = electrodeList + electrodeIdx;
TSI0_GENCS &= ~TSI_GENCS_TSIEN_MASK;
isSleeping = 1;
TSI0_TSHD = TSI_TSHD_THRESL(wakeElectrode->baseline / 2) | TSI_TSHD_THRESH(wakeElectrode->baseline + 5);
TSI0_DATA = TSI_DATA_TSICH(wakeElectrode->channel);
TSI0_GENCS = // Fields to clear
TSI_GENCS_OUTRGF_MASK | TSI_GENCS_EOSF_MASK
|
// Fields to set: 16uA ref charge, 8uA ext charge, 0.43V DVolt, 1 scans, enable interrupt & module, enable in low power, hardware trigger
TSI_GENCS_REFCHRG(5) | TSI_GENCS_DVOLT(2) | TSI_GENCS_EXTCHRG(4) | TSI_GENCS_STPE_MASK |
TSI_GENCS_PS(1) | TSI_GENCS_NSCN(0) | TSI_GENCS_TSIEN_MASK | TSI_GENCS_TSIIEN_MASK | TSI_GENCS_STM_MASK;
}
void capElectrodeInit()
{
#if defined(CAPELECTRODE_TIMESTAMPS)
tpmEnableTimer(TPM_TIMER);
tpmStartTimer(TPM_TIMER, TPM_CLOCKS_PER_MILLISECOND, 0);
#endif
SIM_SCGC5 |= SIM_SCGC5_TSI_MASK;
TSI0_GENCS = // Fields to clear
TSI_GENCS_OUTRGF_MASK | TSI_GENCS_EOSF_MASK
|
// Fields to set: int on end scan, 16uA ref charge, 8uA ext charge, 0.43V DVolt, X scans, enable interrupt & module, enable in low power
TSI_GENCS_ESOR_MASK | TSI_GENCS_REFCHRG(5) | TSI_GENCS_DVOLT(2) | TSI_GENCS_EXTCHRG(4) | TSI_GENCS_STPE_MASK |
TSI_GENCS_PS(4) | TSI_GENCS_NSCN(TSI_SCAN_COUNT - 1) | TSI_GENCS_TSIEN_MASK | TSI_GENCS_TSIIEN_MASK;
}
// Initialize touch input
void touch_init(uint32_t channel_mask)
{
// Turn on clock gating for TSI and configure touch input
SIM_SCGC5 |= SIM_SCGC5_TSI_MASK;
TSI0_GENCS |= (TSI_GENCS_ESOR_MASK // Enable end of scan interrupt
| TSI_GENCS_MODE(0) // Capactive sensing
| TSI_GENCS_REFCHRG(4) // Reference charge 4 uA
| TSI_GENCS_DVOLT(0) // Voltage rails
| TSI_GENCS_EXTCHRG(7) // External osc charge
| TSI_GENCS_PS(4) // Prescalar divide by 4
| TSI_GENCS_NSCN(11) // Scans per electrode
| TSI_GENCS_TSIIEN_MASK // Input interrupt enable
| TSI_GENCS_STPE_MASK // Enable in STOP mode
);
TSI0_GENCS |= TSI_GENCS_TSIEN_MASK;
// Enable touch I/O pins for Freedom board, and configure
// the scan sequence
PORTB_PCR16 = PORT_PCR_MUX(0); // PTB16 as touch channel 9
PORTB_PCR17 = PORT_PCR_MUX(0); // PTB17 as touch channel 10
// Read initial (baseline) values for each enabled channel
int i, first_channel = 0;
enable_mask = channel_mask;
for(i=15; i>=0; i--) {
if((1 << i) & enable_mask) {
scan_start(i);
while(!(TSI0_GENCS & TSI_GENCS_EOSF_MASK)) // Wait until done
;
base_counts[i] = scan_data();
first_channel = i;
}
}
// Enable TSI interrupts and start the first scan
enable_irq(INT_TSI0);
scan_start(first_channel);
}
void TSISensor::TSISensor_reset(void) {
SIM->SCGC5 |= SIM_SCGC5_PORTB_MASK;
SIM->SCGC5 |= SIM_SCGC5_TSI_MASK;
TSI0->GENCS |= (TSI_GENCS_ESOR_MASK
| TSI_GENCS_MODE(0)
| TSI_GENCS_REFCHRG(4)
| TSI_GENCS_DVOLT(0)
| TSI_GENCS_EXTCHRG(7)
| TSI_GENCS_PS(4)
| TSI_GENCS_NSCN(11)
| TSI_GENCS_TSIIEN_MASK
| TSI_GENCS_STPE_MASK
);
TSI0->GENCS |= TSI_GENCS_TSIEN_MASK;
//NVIC_SetVector(TSI0_IRQn, (uint32_t)&tsi_irq);
//NVIC_EnableIRQ(TSI0_IRQn);
selfCalibration();
}
/*******************************************************************
* TSI module initialization.
*/
void TSI_Init (void)
{
SIM_SCGC5 |= SIM_SCGC5_TSI_MASK; // Enable clock gating for TSI
/* Enable proper GPIO as TSI channels */
PORTA_PCR13 = PORT_PCR_MUX(0); // PTB16 as TSI channel 9
PORTB_PCR12 = PORT_PCR_MUX(0); // PTB17 as TSI channel 8
enable_irq(INT_TSI0-16);
TSI0_GENCS |= (TSI_GENCS_ESOR_MASK
| TSI_GENCS_MODE(0)
| TSI_GENCS_REFCHRG(4)
| TSI_GENCS_DVOLT(0)
| TSI_GENCS_EXTCHRG(7)
| TSI_GENCS_PS(4)
| TSI_GENCS_NSCN(11)
| TSI_GENCS_TSIIEN_MASK
| TSI_GENCS_STPE_MASK
//| TSI_GENCS_STM_MASK //Trigger for the module 0=Sofware
);
TSI0_GENCS |= TSI_GENCS_TSIEN_MASK; //Enable TSI module.
TSI_SelfCalibration();
}
