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esp32-hal-touch.h
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/*
Arduino.h - Main include file for the Arduino SDK
Copyright (c) 2005-2013 Arduino Team. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef MAIN_ESP32_HAL_TOUCH_H_
#define MAIN_ESP32_HAL_TOUCH_H_
#ifdef __cplusplus
extern "C" {
#endif
#include "soc/soc_caps.h"
#include "esp32-hal.h"
#if SOC_TOUCH_SENSOR_NUM > 0
#if !defined(SOC_TOUCH_VERSION_1) && !defined(SOC_TOUCH_VERSION_2)
#error Touch IDF driver Not supported!
#endif
#if SOC_TOUCH_VERSION_1 // ESP32
typedef uint16_t touch_value_t;
#elif SOC_TOUCH_VERSION_2 // ESP32S2 ESP32S3
typedef uint32_t touch_value_t;
#endif
/*
* Set cycles that measurement operation takes
* The result from touchRead, threshold and detection
* accuracy depend on these values. Defaults are
* 0x1000 for measure and 0x1000 for sleep.
* With default values touchRead takes 0.5ms
* */
void touchSetCycles(uint16_t measure, uint16_t sleep);
/*
* Read touch pad (for ESP32 values close to 0 mean touch detected /
* for ESP32-S2/S3 higher values mean touch detected)
* You can use this method to chose a good threshold value
* to use as value for touchAttachInterrupt
* */
touch_value_t touchRead(uint8_t pin);
/*
* Set function to be called if touch pad value falls (ESP32)
* below the given threshold / rises (ESP32-S2/S3) by given increment (threshold).
* Use touchRead to determine a proper threshold between touched and untouched state
* */
void touchAttachInterrupt(uint8_t pin, void (*userFunc)(void), touch_value_t threshold);
void touchAttachInterruptArg(uint8_t pin, void (*userFunc)(void*), void *arg, touch_value_t threshold);
void touchDetachInterrupt(uint8_t pin);
/*
* Specific functions to ESP32
* Tells the driver if it shall activate the ISR if the sensor is Lower or Higher than the Threshold
* Default if Lower.
**/
#if SOC_TOUCH_VERSION_1 // Only for ESP32 SoC
void touchInterruptSetThresholdDirection(bool mustbeLower);
#endif
/*
* Specific functions to ESP32-S2 and ESP32-S3
* Returns true when the latest ISR status for the Touchpad is that it is touched (Active)
* and false when the Touchpad is untoouched (Inactive)
* This function can be used in conjunction with ISR User callback in order to take action
* as soon as the touchpad is touched and/or released
**/
#if SOC_TOUCH_VERSION_2 // Only for ESP32S2 and ESP32S3
// returns true if touch pad has been and continues pressed and false otherwise
bool touchInterruptGetLastStatus(uint8_t pin);
#endif
/*
* Setup touch pad wake up from deep sleep with given threshold.
**/
void touchSleepWakeUpEnable(uint8_t pin, touch_value_t threshold);
#endif // SOC_TOUCH_SENSOR_NUM > 0
#ifdef __cplusplus
}
#endif
#endif /* MAIN_ESP32_HAL_TOUCH_H_ */