boolean Adafruit_MPR121::begin(uint8_t i2caddr) {
Wire.begin();
_i2caddr = i2caddr;
// soft reset
writeRegister(MPR121_SOFTRESET, 0x63);
delay(1);
for (uint8_t i=0; i<0x7F; i++) {
// Serial.print("$"); Serial.print(i, HEX);
// Serial.print(": 0x"); Serial.println(readRegister8(i));
}
writeRegister(MPR121_ECR, 0x0);
uint8_t c = readRegister8(MPR121_CONFIG2);
if (c != 0x24) return false;
setThreshholds(48,6); //(12, 6); // ylh: THIS IS THE THRESHOLDS FOR ALL KEYS
writeRegister(MPR121_MHDR, 0x01);
writeRegister(MPR121_NHDR, 0x01);
writeRegister(MPR121_NCLR, 0x0E);
writeRegister(MPR121_FDLR, 0x00);
writeRegister(MPR121_MHDF, 0x01);
writeRegister(MPR121_NHDF, 0x05);
writeRegister(MPR121_NCLF, 0x01);
writeRegister(MPR121_FDLF, 0x00);
writeRegister(MPR121_NHDT, 0x00);
writeRegister(MPR121_NCLT, 0x00);
writeRegister(MPR121_FDLT, 0x00);
writeRegister(MPR121_DEBOUNCE, 0);
writeRegister(MPR121_CONFIG1, 0x10); // default, 16uA charge current
writeRegister(MPR121_CONFIG2, 0x20); // 0.5uS encoding, 1ms period
// writeRegister(MPR121_AUTOCONFIG0, 0x8F);
// writeRegister(MPR121_UPLIMIT, 150);
// writeRegister(MPR121_TARGETLIMIT, 100); // should be ~400 (100 shifted)
// writeRegister(MPR121_LOWLIMIT, 50);
// enable all electrodes
writeRegister(MPR121_ECR, 0x8F); // start with first 5 bits of baseline tracking
return true;
}
boolean Adafruit_MPR121::begin(uint8_t i2caddr) {
Wire.begin();
_i2caddr = i2caddr;
// soft reset
writeRegister(MPR121_SOFTRESET, 0x63);
delay(1);
for (uint8_t i=0; i<0x7F; i++) {
// Serial.print("$"); Serial.print(i, HEX);
// Serial.print(": 0x"); Serial.println(readRegister8(i));
}
writeRegister(MPR121_ECR, 0x0);
uint8_t c = readRegister8(MPR121_CONFIG2);
if (c != 0x24) return false;
if (tweak_thresh == 1)
setThreshholds(13, 1); //13, 1
else
setThreshholds(12, 6);
if (tweak_FLDR == 1)
writeRegister(MPR121_FDLR, 0x05); //05
else
writeRegister(MPR121_FDLR, 0x00);
if (tweak_MHDR == 1)
writeRegister(MPR121_MHDR, 0x03); //0x03
else
writeRegister(MPR121_MHDR, 0x01);
if (tweak_NHDR == 1)
writeRegister(MPR121_NHDR, 0x10); //10
else
writeRegister(MPR121_NHDR, 0x01);
if (tweak_NCLR == 1)
writeRegister(MPR121_NCLR, 0x15); //15
else
writeRegister(MPR121_NCLR, 0x0E);
//maximum half delta (MHD): Determines the largest magnitude of variation to
//pass through the baseline filter. The range of the effective value is 1~63
if (tweak_MHDF == 1)
writeRegister(MPR121_MHDF, 0x03); //0x03
else
writeRegister(MPR121_MHDF, 0x01);
/*Noise Half Delta (NHD): Determines the incremental change when non - noise drift is detected. The range of the effective value is 1~63. */
if (tweak_NHDF == 1)
writeRegister(MPR121_NHDF, 0x10); //10
else
writeRegister(MPR121_NHDF, 0x05);
/*Noise Count Limit (NCL): Determines the number of samples consecutively greater than the Max Half Delta necessary before it can be determined that it is non-noise. The range of the effective value is 0~255 */
if (tweak_NCLF == 1)
writeRegister(MPR121_NCLF, 0xb4); //0xb4
else
writeRegister(MPR121_NCLF, 0x01);
/*Filter Delay Count Limit (FDL): Determines the rate of operation of the filter. A larger number makes it operate slower. The range of the effective value is 0~255 */
if (tweak_FDLF == 1)
writeRegister(MPR121_FDLF, 0xFF); //30
else
writeRegister(MPR121_FDLF, 0x00);
if (tweak_NHDT == 1)
writeRegister(MPR121_NHDT, 0x01); //03
else
writeRegister(MPR121_NHDT, 0x00);
if (tweak_NCLT == 1)
writeRegister(MPR121_NCLT, 0x30); //30
else
writeRegister(MPR121_NCLT, 0x00);
if (tweak_FDLT == 1)
writeRegister(MPR121_FDLT, 0x3F); //10
else
writeRegister(MPR121_FDLT, 0x00);
if (tweak_debounce == 1)
writeRegister(MPR121_DEBOUNCE, 0x01); //01
else
writeRegister(MPR121_DEBOUNCE, 0x00);
writeRegister(MPR121_CONFIG1, 0x10); // default, 16uA charge current
writeRegister(MPR121_CONFIG2, 0x20); // 0.5uS encoding, 1ms period
// writeRegister(MPR121_AUTOCONFIG0, 0x8F);
//writeRegister(MPR121_UPLIMIT, 150);
//writeRegister(MPR121_TARGETLIMIT, 120); // should be ~400 (100 shifted)
//writeRegister(MPR121_LOWLIMIT, 50);
// enable all electrodes
writeRegister(MPR121_ECR, 0x8F); // start with first 5 bits of baseline tracking
return true;
}
