// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
#include "driver/touch_sensor_common.h"
/**
* @brief Set touch sensor FSM start
* @note Start FSM after the touch sensor FSM mode is set.
* @note Call this function will reset baseline of all touch channels.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_fsm_start(void);
/**
* @brief Stop touch sensor FSM.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_fsm_stop(void);
/**
* @brief Trigger a touch sensor measurement, only support in SW mode of FSM
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_sw_start(void);
/**
* @brief Set touch sensor times of charge and discharge and sleep time.
* Excessive total time will slow down the touch response.
* Too small measurement time will not be sampled enough, resulting in inaccurate measurements.
*
* @note The greater the duty cycle of the measurement time, the more system power is consumed.
* @param sleep_cycle The touch sensor will sleep after each measurement.
* sleep_cycle decide the interval between each measurement.
* t_sleep = sleep_cycle / (RTC_SLOW_CLK frequency).
* The approximate frequency value of RTC_SLOW_CLK can be obtained using rtc_clk_slow_freq_get_hz function.
* @param meas_times The times of charge and discharge in each measure process of touch channels.
* The timer frequency is 8Mhz. Range: 0 ~ 0xffff.
* Recommended typical value: Modify this value to make the measurement time around 1ms.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_set_meas_time(uint16_t sleep_cycle, uint16_t meas_times);
/**
* @brief Get touch sensor times of charge and discharge and sleep time
* @param sleep_cycle Pointer to accept sleep cycle number
* @param meas_times Pointer to accept measurement times count.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_get_meas_time(uint16_t *sleep_cycle, uint16_t *meas_times);
/**
* @brief Set connection type of touch channel in idle status.
* When a channel is in measurement mode, other initialized channels are in idle mode.
* The touch channel is generally adjacent to the trace, so the connection state of the idle channel
* affects the stability and sensitivity of the test channel.
* The `CONN_HIGHZ`(high resistance) setting increases the sensitivity of touch channels.
* The `CONN_GND`(grounding) setting increases the stability of touch channels.
* @param type Select idle channel connect to high resistance state or ground.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_set_idle_channel_connect(touch_pad_conn_type_t type);
/**
* @brief Set connection type of touch channel in idle status.
* When a channel is in measurement mode, other initialized channels are in idle mode.
* The touch channel is generally adjacent to the trace, so the connection state of the idle channel
* affects the stability and sensitivity of the test channel.
* The `CONN_HIGHZ`(high resistance) setting increases the sensitivity of touch channels.
* The `CONN_GND`(grounding) setting increases the stability of touch channels.
* @param type Pointer to connection type.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_get_idle_channel_connect(touch_pad_conn_type_t *type);
/**
* @brief Set the trigger threshold of touch sensor.
* The threshold determines the sensitivity of the touch sensor.
* The threshold is the original value of the trigger state minus the baseline value.
* @note If set "TOUCH_PAD_THRESHOLD_MAX", the touch is never be triggered.
* @param touch_num touch pad index
* @param threshold threshold of touch sensor. Should be less than the max change value of touch.
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_set_thresh(touch_pad_t touch_num, uint32_t threshold);
/**
* @brief Get touch sensor trigger threshold
* @param touch_num touch pad index
* @param threshold pointer to accept threshold
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_ARG if argument is wrong
*/
esp_err_t touch_pad_get_thresh(touch_pad_t touch_num, uint32_t *threshold);
/**
* @brief Register touch channel into touch sensor scan group.
* The working mode of the touch sensor is cyclically scanned.
* This function will set the scan bits according to the given bitmask.
* @note If set this mask, the FSM timer should be stop firsty.
* @note The touch sensor that in scan map, should be deinit GPIO function firstly by `touch_pad_io_init`.
* @param enable_mask bitmask of touch sensor scan group.
* e.g. TOUCH_PAD_NUM14 -> BIT(14)
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_set_channel_mask(uint16_t enable_mask);
/**
* @brief Get the touch sensor scan group bit mask.
* @param enable_mask Pointer to bitmask of touch sensor scan group.
* e.g. TOUCH_PAD_NUM14 -> BIT(14)
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_get_channel_mask(uint16_t *enable_mask);
/**
* @brief Clear touch channel from touch sensor scan group.
* The working mode of the touch sensor is cyclically scanned.
* This function will clear the scan bits according to the given bitmask.
* @note If clear all mask, the FSM timer should be stop firsty.
* @param enable_mask bitmask of touch sensor scan group.
* e.g. TOUCH_PAD_NUM14 -> BIT(14)
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_clear_channel_mask(uint16_t enable_mask);
/**
* @brief Configure parameter for each touch channel.
* @note Touch num 0 is denoise channel, please use `touch_pad_denoise_enable` to set denoise function
* @param touch_num touch pad index
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG if argument wrong
* - ESP_FAIL if touch pad not initialized
*/
esp_err_t touch_pad_config(touch_pad_t touch_num);
/**
* @brief Reset the FSM of touch module.
* @note Call this function after `touch_pad_fsm_stop`.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_reset(void);
/**
* @brief Get the current measure channel.
* @note Should be called when touch sensor measurement is in cyclic scan mode.
* @return
* - touch channel number
*/
touch_pad_t touch_pad_get_current_meas_channel(void);
/**
* @brief Get the touch sensor interrupt status mask.
* @return
* - touch interrupt bit
*/
uint32_t touch_pad_read_intr_status_mask(void);
/**
* @brief Enable touch sensor interrupt by bitmask.
* @param int_mask Pad mask to enable interrupts
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_intr_enable(touch_pad_intr_mask_t int_mask);
/**
* @brief Disable touch sensor interrupt by bitmask.
* @param int_mask Pad mask to disable interrupts
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_intr_disable(touch_pad_intr_mask_t int_mask);
/**
* @brief Clear touch sensor interrupt by bitmask.
* @param int_mask Pad mask to clear interrupts
* @return
* - ESP_OK on success
*/
esp_err_t touch_pad_intr_clear(touch_pad_intr_mask_t int_mask);
/**
* @brief Register touch-pad ISR.
* The handler will be attached to the same CPU core that this function is running on.
* @param fn Pointer to ISR handler
* @param arg Parameter for ISR
* @param intr_mask Enable touch sensor interrupt handler by bitmask.
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Arguments error
* - ESP_ERR_NO_MEM No memory
*/
esp_err_t touch_pad_isr_register(intr_handler_t fn, void *arg, touch_pad_intr_mask_t intr_mask);
/**
* @brief Enable/disable the timeout check and set timeout threshold for all touch sensor channels measurements.
* If enable: When the touch reading of a touch channel exceeds the measurement threshold, a timeout interrupt will be generated.
* If disable: the FSM does not check if the channel under measurement times out.
*
* @note The threshold compared with touch readings.
* @note In order to avoid abnormal short circuit of some touch channels. This function should be turned on.
* Ensure the normal operation of other touch channels.
*
* @param enable true(default): Enable the timeout check; false: Disable the timeout check.
* @param threshold For all channels, the maximum value that will not be exceeded during normal operation.
*
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_timeout_set(bool enable, uint32_t threshold);
/**
* @brief Call this interface after timeout to make the touch channel resume normal work. Point on the next channel to measure.
* If this API is not called, the touch FSM will stop the measurement after timeout interrupt.
*
* @note Call this API after finishes the exception handling by user.
*
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_timeout_resume(void);
/**
* @brief get raw data of touch sensor.
* @note After the initialization is complete, the "raw_data" is max value. You need to wait for a measurement
* cycle before you can read the correct touch value.
* @param touch_num touch pad index
* @param raw_data pointer to accept touch sensor value
* @return
* - ESP_OK Success
* - ESP_FAIL Touch channel 0 haven't this parameter.
*/
esp_err_t touch_pad_read_raw_data(touch_pad_t touch_num, uint32_t *raw_data);
/**
* @brief get baseline of touch sensor.
* @note After initialization, the baseline value is the maximum during the first measurement period.
* @param touch_num touch pad index
* @param basedata pointer to accept touch sensor baseline value
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Touch channel 0 haven't this parameter.
*/
esp_err_t touch_pad_filter_read_baseline(touch_pad_t touch_num, uint32_t *basedata);
/**
* @brief Get smoothed data that obtained by filtering the raw data.
*
* @param touch_num touch pad index
* @param smooth pointer to smoothed data
*/
esp_err_t touch_pad_filter_read_smooth(touch_pad_t touch_num, uint32_t *smooth);
/**
* @brief Force reset baseline to raw data of touch sensor.
* @param touch_num touch pad index
* - TOUCH_PAD_MAX Reset basaline of all channels
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_filter_reset_baseline(touch_pad_t touch_num);
/**
* @brief set parameter of touch sensor filter and detection algorithm.
* For more details on the detection algorithm, please refer to the application documentation.
* @param filter_info select filter type and threshold of detection algorithm
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_filter_set_config(touch_filter_config_t *filter_info);
/**
* @brief get parameter of touch sensor filter and detection algorithm.
* For more details on the detection algorithm, please refer to the application documentation.
* @param filter_info select filter type and threshold of detection algorithm
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_filter_get_config(touch_filter_config_t *filter_info);
/**
* @brief enable touch sensor filter for detection algorithm.
* For more details on the detection algorithm, please refer to the application documentation.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_filter_enable(void);
/**
* @brief disable touch sensor filter for detection algorithm.
* For more details on the detection algorithm, please refer to the application documentation.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_filter_disable(void);
/**
* @brief set parameter of denoise pad (TOUCH_PAD_NUM0).
* T0 is an internal channel that does not have a corresponding external GPIO.
* T0 will work simultaneously with the measured channel Tn. Finally, the actual
* measured value of Tn is the value after subtracting lower bits of T0.
* The noise reduction function filters out interference introduced simultaneously on all channels,
* such as noise introduced by power supplies and external EMI.
* @param denoise parameter of denoise
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_denoise_set_config(touch_pad_denoise_t *denoise);
/**
* @brief get parameter of denoise pad (TOUCH_PAD_NUM0).
* @param denoise Pointer to parameter of denoise
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_denoise_get_config(touch_pad_denoise_t *denoise);
/**
* @brief enable denoise function.
* T0 is an internal channel that does not have a corresponding external GPIO.
* T0 will work simultaneously with the measured channel Tn. Finally, the actual
* measured value of Tn is the value after subtracting lower bits of T0.
* The noise reduction function filters out interference introduced simultaneously on all channels,
* such as noise introduced by power supplies and external EMI.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_denoise_enable(void);
/**
* @brief disable denoise function.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_denoise_disable(void);
/**
* @brief Get denoise measure value (TOUCH_PAD_NUM0).
* @param data Pointer to receive denoise value
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_denoise_read_data(uint32_t *data);
/**
* @brief set parameter of waterproof function.
* The waterproof function includes a shielded channel (TOUCH_PAD_NUM14) and a guard channel.
* The shielded channel outputs the same signal as the channel being measured.
* It is generally designed as a grid and is placed around the touch buttons.
* The shielded channel does not follow the measurement signal of the protection channel.
* So that the guard channel can detect a large area of water.
* @param waterproof parameter of waterproof
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_waterproof_set_config(touch_pad_waterproof_t *waterproof);
/**
* @brief get parameter of waterproof function.
* @param waterproof parameter of waterproof
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_waterproof_get_config(touch_pad_waterproof_t *waterproof);
/**
* @brief Enable parameter of waterproof function.
* The waterproof function includes a shielded channel (TOUCH_PAD_NUM14) and a guard channel.
* The shielded channel outputs the same signal as the channel being measured.
* It is generally designed as a grid and is placed around the touch buttons.
* The shielded channel does not follow the measurement signal of the protection channel.
* So that the guard channel can detect a large area of water.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_waterproof_enable(void);
/**
* @brief Enable parameter of waterproof function.
* The waterproof function includes a shielded channel (TOUCH_PAD_NUM14) and a guard channel.
* The shielded channel outputs the same signal as the channel being measured.
* It is generally designed as a grid and is placed around the touch buttons.
* The shielded channel does not follow the measurement signal of the protection channel.
* So that the guard channel can detect a large area of water.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_waterproof_disable(void);
/**
* @brief Enable/disable proximity function of touch channels.
* The proximity sensor measurement is the accumulation of touch channel measurements.
*
* @note Supports up to three touch channels configured as proximity sensors.
* @param touch_num touch pad index
* @param enabled true: enable the proximity function; false: disable the proximity function
* @return
* - ESP_OK: Configured correctly.
* - ESP_ERR_INVALID_ARG: Touch channel number error.
* - ESP_ERR_NOT_SUPPORTED: Don't support configured.
*/
esp_err_t touch_pad_proximity_enable(touch_pad_t touch_num, bool enabled);
/**
* @brief Set measure count of proximity channel.
* The proximity sensor measurement is the accumulation of touch channel measurements.
*
* @note All proximity channels use the same `count` value. So please pass the parameter `TOUCH_PAD_MAX`.
* @param touch_num Touch pad index. In this version, pass the parameter `TOUCH_PAD_MAX`.
* @param count The cumulative times of measurements for proximity pad. Range: 0 ~ 255.
* @return
* - ESP_OK: Configured correctly.
* - ESP_ERR_INVALID_ARG: Touch channel number error.
*/
esp_err_t touch_pad_proximity_set_count(touch_pad_t touch_num, uint32_t count);
/**
* @brief Get measure count of proximity channel.
* The proximity sensor measurement is the accumulation of touch channel measurements.
*
* @note All proximity channels use the same `count` value. So please pass the parameter `TOUCH_PAD_MAX`.
* @param touch_num Touch pad index. In this version, pass the parameter `TOUCH_PAD_MAX`.
* @param count The cumulative times of measurements for proximity pad. Range: 0 ~ 255.
* @return
* - ESP_OK: Configured correctly.
* - ESP_ERR_INVALID_ARG: Touch channel number error.
*/
esp_err_t touch_pad_proximity_get_count(touch_pad_t touch_num, uint32_t *count);
/**
* @brief Get the accumulated measurement of the proximity sensor.
* The proximity sensor measurement is the accumulation of touch channel measurements.
* @param touch_num touch pad index
* @param measure_out If the accumulation process does not end, the `measure_out` is the process value.
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG Touch num is not proximity
*/
esp_err_t touch_pad_proximity_get_data(touch_pad_t touch_num, uint32_t *measure_out);
/**
* @brief Get parameter of touch sensor sleep channel.
* The touch sensor can works in sleep mode to wake up sleep.
*
* @note After the sleep channel is configured, Please use special functions for sleep channel.
* e.g. The user should uses `touch_pad_sleep_channel_read_data` instead of `touch_pad_read_raw_data` to obtain the sleep channel reading.
*
* @param slp_config touch sleep pad config.
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_channel_get_info(touch_pad_sleep_channel_t *slp_config);
/**
* @brief Enable/Disable sleep channel function for touch sensor.
* The touch sensor can works in sleep mode to wake up sleep.
*
* @note ESP32S2 only support one sleep channel.
* @note After the sleep channel is configured, Please use special functions for sleep channel.
* e.g. The user should uses `touch_pad_sleep_channel_read_data` instead of `touch_pad_read_raw_data` to obtain the sleep channel reading.
*
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param enable true: enable sleep pad for touch sensor; false: disable sleep pad for touch sensor;
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_channel_enable(touch_pad_t pad_num, bool enable);
/**
* @brief Enable/Disable proximity function for sleep channel.
* The touch sensor can works in sleep mode to wake up sleep.
*
* @note ESP32S2 only support one sleep channel.
*
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param enable true: enable proximity for sleep channel; false: disable proximity for sleep channel;
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_channel_enable_proximity(touch_pad_t pad_num, bool enable);
/**
* @brief Set the trigger threshold of touch sensor in deep sleep.
* The threshold determines the sensitivity of the touch sensor.
*
* @note In general, the touch threshold during sleep can use the threshold parameter parameters before sleep.
*
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param touch_thres touch sleep pad threshold
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_set_threshold(touch_pad_t pad_num, uint32_t touch_thres);
/**
* @brief Get the trigger threshold of touch sensor in deep sleep.
* The threshold determines the sensitivity of the touch sensor.
*
* @note In general, the touch threshold during sleep can use the threshold parameter parameters before sleep.
*
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param touch_thres touch sleep pad threshold
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_get_threshold(touch_pad_t pad_num, uint32_t *touch_thres);
/**
* @brief Read baseline of touch sensor sleep channel.
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param baseline pointer to accept touch sensor baseline value
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG parameter is NULL
*/
esp_err_t touch_pad_sleep_channel_read_baseline(touch_pad_t pad_num, uint32_t *baseline);
/**
* @brief Read smoothed data of touch sensor sleep channel.
* Smoothed data is filtered from the raw data.
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param smooth_data pointer to accept touch sensor smoothed data
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG parameter is NULL
*/
esp_err_t touch_pad_sleep_channel_read_smooth(touch_pad_t pad_num, uint32_t *smooth_data);
/**
* @brief Read raw data of touch sensor sleep channel.
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param raw_data pointer to accept touch sensor raw data
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG parameter is NULL
*/
esp_err_t touch_pad_sleep_channel_read_data(touch_pad_t pad_num, uint32_t *raw_data);
/**
* @brief Reset baseline of touch sensor sleep channel.
*
* @return
* - ESP_OK Success
*/
esp_err_t touch_pad_sleep_channel_reset_baseline(void);
/**
* @brief Read proximity count of touch sensor sleep channel.
* @param pad_num Set touch channel number for sleep pad. Only one touch sensor channel is supported in deep sleep mode.
* @param proximity_cnt pointer to accept touch sensor proximity count value
* @return
* - ESP_OK Success
* - ESP_ERR_INVALID_ARG parameter is NULL
*/
esp_err_t touch_pad_sleep_channel_read_proximity_cnt(touch_pad_t pad_num, uint32_t *proximity_cnt);
#ifdef __cplusplus
}
#endif