// 24: SENS_TOUCH_OUT_SEL 1: the touch pad is considered touched when the value of the counter is greater than the threshold, 0: the touch pad is considered touched when the value of the counter is less than the threshold. (R/W)
if (threshold_above == 1) {	// trigger when touch reading is BELOW the threshold
	CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
} else	{// trigger when touch reading is ABOVE the threshold
	SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
}

  setThresholdDirection(0); // trigger if threshold below value. 0 = false, 1 = true
  touchAttachInterrupt(T0, callback, Threshold);  //Setup interrupt on Touch Pad 0 (GPIO4)

/**
 * set if trigger will be when value goes above or below threshold. 
 */
void setThresholdDirection(uint8_t above);

/**
 * above = 0 means false, = anything else means true.
 */
uint32_t threshold_above = 1;

/**
 * above = 0 means anything below threshold will trigger, anything else means threshold ABOVE will trigger.
 */
void __setThresholdDirection(uint8_t above) {
  if (above == 0) {
    threshold_above = 0;
  } else
    threshold_above = 1;
}

void __touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), uint16_t threshold)
{
    int8_t pad = digitalPinToTouchChannel(pin);
    if(pad < 0){
        return;
    }

    pinMode(pin, ANALOG);

    __touchInit();

    __touchInterruptHandlers[pad] = userFunc;

    //clear touch force ,select the Touch mode is Timer
    CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL2_REG, SENS_TOUCH_START_EN_M|SENS_TOUCH_START_FORCE_M);

    // 24: SENS_TOUCH_OUT_SEL 1: the touch pad is considered touched when the value of the counter is greater than the threshold, 0: the touch pad is considered touched when the value of the counter is less than the threshold. (R/W)
    if (threshold_above == 1) { // trigger when touch reading is BELOW the threshold
      CLEAR_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
    } else  {// trigger when touch reading is ABOVE the threshold
      SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_SEL);
    }
    //Intr will give ,when SET0 < threshold
    SET_PERI_REG_MASK(SENS_SAR_TOUCH_CTRL1_REG, SENS_TOUCH_OUT_1EN);
    //Enable Rtc Touch Module Intr,the Interrupt need Rtc out  Enable
    SET_PERI_REG_MASK(RTC_CNTL_INT_ENA_REG, RTC_CNTL_TOUCH_INT_ENA);

    //set threshold
    uint8_t shift = (pad & 1) ? SENS_TOUCH_OUT_TH1_S : SENS_TOUCH_OUT_TH0_S;
    SET_PERI_REG_BITS((SENS_SAR_TOUCH_THRES1_REG + (pad / 2) * 4), SENS_TOUCH_OUT_TH0, threshold, shift);

    uint32_t rtc_tio_reg = RTC_IO_TOUCH_PAD0_REG + pad * 4;
    WRITE_PERI_REG(rtc_tio_reg, (READ_PERI_REG(rtc_tio_reg)
                      & ~(RTC_IO_TOUCH_PAD0_DAC_M))
                      | (7 << RTC_IO_TOUCH_PAD0_DAC_S)//Touch Set Slope
                      | RTC_IO_TOUCH_PAD0_TIE_OPT_M   //Enable Tie,Init Level
                      | RTC_IO_TOUCH_PAD0_START_M     //Enable Touch Pad IO
                      | RTC_IO_TOUCH_PAD0_XPD_M);     //Enable Touch Pad Power on

    //Enable Digital rtc control :work mode and out mode
    SET_PERI_REG_MASK(SENS_SAR_TOUCH_ENABLE_REG,
                      (1 << (pad + SENS_TOUCH_PAD_WORKEN_S)) | \
                      (1 << (pad + SENS_TOUCH_PAD_OUTEN2_S)) | \
                      (1 << (pad + SENS_TOUCH_PAD_OUTEN1_S)));
}

extern void setThresholdDirection(uint8_t) __attribute__ ((weak, alias("__setThresholdDirection")));