int touchRead(uint8_t pin)
{
uint32_t ch;
if (pin >= NUM_DIGITAL_PINS) return 0;
ch = pin2tsi[pin];
if (ch == 255) return 0;
*portConfigRegister(pin) = PORT_PCR_MUX(0);
SIM_SCGC5 |= SIM_SCGC5_TSI;
#if defined(HAS_KINETIS_TSI)
TSI0_GENCS = 0;
TSI0_PEN = (1 << ch);
TSI0_SCANC = TSI_SCANC_REFCHRG(3) | TSI_SCANC_EXTCHRG(CURRENT);
TSI0_GENCS = TSI_GENCS_NSCN(NSCAN) | TSI_GENCS_PS(PRESCALE) | TSI_GENCS_TSIEN | TSI_GENCS_SWTS;
delayMicroseconds(10);
while (TSI0_GENCS & TSI_GENCS_SCNIP) ; // wait
delayMicroseconds(1);
return *((volatile uint16_t *)(&TSI0_CNTR1) + ch);
#elif defined(HAS_KINETIS_TSI_LITE)
TSI0_GENCS = TSI_GENCS_REFCHRG(4) | TSI_GENCS_EXTCHRG(3) | TSI_GENCS_PS(PRESCALE)
| TSI_GENCS_NSCN(NSCAN) | TSI_GENCS_TSIEN | TSI_GENCS_EOSF;
TSI0_DATA = TSI_DATA_TSICH(ch) | TSI_DATA_SWTS;
delayMicroseconds(10);
while (TSI0_GENCS & TSI_GENCS_SCNIP) ; // wait
delayMicroseconds(1);
return TSI0_DATA & 0xFFFF;
#endif
}
boolean tsi_init(uint8_t pin, uint16_t threshold) {
boolean error = false;
if ( tsi_pins[pin] == 255) { error = true; return error; }
TSI0_THRESHOLD = threshold;
TSI0_GENCS |= TSI_GENCS_EOSF;
TSI0_GENCS |= ((TSI_GENCS_NSCN(9)) |
(TSI_GENCS_PS(2)) |
(TSI_GENCS_STPE) |
(TSI_GENCS_LPSCNITV(7)) |
(TSI_GENCS_TSIIE));
TSI0_SCANC |= ((TSI_SCANC_EXTCHRG(2)) |
(TSI_SCANC_REFCHRG(3)) |
(TSI_SCANC_AMPSC(1)) |
(TSI_SCANC_AMCLKS(0)));
TSI0_PEN |= TSI_PEN_LPSP(tsi_pins[pin]);
TSI0_GENCS |= TSI_GENCS_TSIEN; //Enables TSI
while(!(TSI0_GENCS&TSI_GENCS_EOSF)){}; //Wait for last scan to happen
TSI0_GENCS |= TSI_GENCS_OUTRGF; //Clear all pending flags
TSI0_GENCS |= TSI_GENCS_EOSF;
return false;
}
