void hw_tsi_init(uint_8 chnlID)
{
//开启TSI时钟
SIM_SCGC5 |= (SIM_SCGC5_TSI_MASK) | (SIM_SCGC5_PORTA_MASK);
//通道5使能
PORTA_PCR4 = PORT_PCR_MUX(0);
//配置TSI通用寄存器
TSI0_GENCS |= (TSI_GENCS_REFCHRG(4)
| TSI_GENCS_DVOLT(0)
| TSI_GENCS_EXTCHRG(6)
| TSI_GENCS_PS(2)
| TSI_GENCS_NSCN(11)
| TSI_GENCS_TSIIEN_MASK
| TSI_GENCS_STPE_MASK
);
TSI0_GENCS &= ~TSI_GENCS_ESOR_MASK;
TSI0_GENCS &= ~TSI_GENCS_STM_MASK;
//清越值标志位和扫描完成位
TSI0_GENCS |= (TSI_GENCS_OUTRGF_MASK) | (TSI_GENCS_EOSF_MASK);
//选择通道
TSI0_DATA |= (TSI_DATA_TSICH(chnlID));
//TSI使能
TSI0_GENCS |= (TSI_GENCS_TSIEN_MASK);
}
void TSI0_IRQHandler()
{
if (TSI0_GENCS & TSI_GENCS_OUTRGF_MASK && isSleeping) {
TSI0_GENCS |= TSI_GENCS_OUTRGF_MASK | TSI_GENCS_EOSF_MASK;
outOfRangeInterruptCount++;
} else {
#if defined(CAPELECTRODE_TIMESTAMPS)
activeElectrode->timestamp[activeElectrode->bufferWriteIndex] = tpmGetTimeHighPrecision(TPM_TIMER);
#endif
activeElectrode->buffer[activeElectrode->bufferWriteIndex++] = (TSI0_DATA & TSI_DATA_TSICNT_MASK) / (TSI_SCAN_COUNT * TSI_PRESCALE_DIVISOR);
TSI0_GENCS |= TSI_GENCS_EOSF_MASK;
activeElectrode->bufferWriteIndex %= ELECTRODE_BUFFER_SIZE;
if (!(activeElectrode->flags & ELECTRODE_FLAGS_ACTIVE) && !activeElectrode->bufferWriteIndex) {
activeElectrode->baseline =
(activeElectrode->buffer[0] + activeElectrode->buffer[1] + activeElectrode->buffer[2] + activeElectrode->buffer[3]) / 4;
activeElectrode->flags |= ELECTRODE_FLAGS_ACTIVE;
}
activeElectrode++;
if (electrodeCount == activeElectrode - electrodeList) {
activeElectrode = electrodeList;
}
TSI0_DATA = TSI_DATA_TSICH(activeElectrode->channel) | TSI_DATA_SWTS_MASK;
}
}
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
}
void capElectrodeWake()
{
capElectrodeInit();
isSleeping = 0;
if (activeElectrode) {
TSI0_DATA = TSI_DATA_TSICH(activeElectrode->channel) | TSI_DATA_SWTS_MASK;
}
}
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 capElectrodeSetElectrodes(int count, Electrode* electrodes)
{
NVIC_DisableIRQ(TSI0_IRQn);
if (count > 0 && electrodes != NULL) {
electrodeList = electrodes;
electrodeCount = count;
for (int i = 0; i < count; i++) {
electrodes[i].flags = 0;
electrodes[i].baseline = 0;
electrodes[i].bufferWriteIndex = 0;
}
activeElectrode = electrodeList;
NVIC_EnableIRQ(TSI0_IRQn);
TSI0_DATA = TSI_DATA_TSICH(activeElectrode->channel) | TSI_DATA_SWTS_MASK;
} else {
electrodeList = NULL;
electrodeCount = 0;
}
}
// Initiate a touch scan on the given channel
inline static void scanStart(int channel)
{
TSI0_DATA = TSI_DATA_TSICH(channel) | TSI_DATA_SWTS_MASK;
}
