340563f479
1.update touch sensor driver for esp32s2; 2.update unit test for touch sensor; 3.update register files about touch sensor;
340 lines
13 KiB
C
340 lines
13 KiB
C
// Copyright 2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "driver/touch_sensor_common.h"
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/**
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* @brief Configure touch pad interrupt threshold.
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*
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* @note If FSM mode is set to TOUCH_FSM_MODE_TIMER, this function will be blocked for one measurement cycle and wait for data to be valid.
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*
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* @param touch_num touch pad index
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* @param threshold interrupt threshold,
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG if argument wrong
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* - ESP_FAIL if touch pad not initialized
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*/
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esp_err_t touch_pad_config(touch_pad_t touch_num, uint16_t threshold);
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/**
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* @brief get touch sensor counter value.
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* Each touch sensor has a counter to count the number of charge/discharge cycles.
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* When the pad is not 'touched', we can get a number of the counter.
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* When the pad is 'touched', the value in counter will get smaller because of the larger equivalent capacitance.
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*
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* @note This API requests hardware measurement once. If IIR filter mode is enabled,
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* please use 'touch_pad_read_raw_data' interface instead.
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*
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* @param touch_num touch pad index
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* @param touch_value pointer to accept touch sensor value
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Touch pad parameter error
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* - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
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* - ESP_FAIL Touch pad not initialized
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*/
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esp_err_t touch_pad_read(touch_pad_t touch_num, uint16_t *touch_value);
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/**
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* @brief get filtered touch sensor counter value by IIR filter.
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*
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* @note touch_pad_filter_start has to be called before calling touch_pad_read_filtered.
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* This function can be called from ISR
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*
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* @param touch_num touch pad index
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* @param touch_value pointer to accept touch sensor value
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Touch pad parameter error
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* - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
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* - ESP_FAIL Touch pad not initialized
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*/
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esp_err_t touch_pad_read_filtered(touch_pad_t touch_num, uint16_t *touch_value);
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/**
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* @brief get raw data (touch sensor counter value) from IIR filter process.
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* Need not request hardware measurements.
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*
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* @note touch_pad_filter_start has to be called before calling touch_pad_read_raw_data.
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* This function can be called from ISR
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*
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* @param touch_num touch pad index
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* @param touch_value pointer to accept touch sensor value
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*
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Touch pad parameter error
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* - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
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* - ESP_FAIL Touch pad not initialized
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*/
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esp_err_t touch_pad_read_raw_data(touch_pad_t touch_num, uint16_t *touch_value);
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/**
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* @brief Callback function that is called after each IIR filter calculation.
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* @note This callback is called in timer task in each filtering cycle.
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* @note This callback should not be blocked.
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* @param raw_value The latest raw data(touch sensor counter value) that
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* points to all channels(raw_value[0..TOUCH_PAD_MAX-1]).
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* @param filtered_value The latest IIR filtered data(calculated from raw data) that
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* points to all channels(filtered_value[0..TOUCH_PAD_MAX-1]).
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*
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*/
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typedef void (* filter_cb_t)(uint16_t *raw_value, uint16_t *filtered_value);
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/**
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* @brief Register the callback function that is called after each IIR filter calculation.
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* @note The 'read_cb' callback is called in timer task in each filtering cycle.
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* @param read_cb Pointer to filtered callback function.
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* If the argument passed in is NULL, the callback will stop.
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG set error
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*/
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esp_err_t touch_pad_set_filter_read_cb(filter_cb_t read_cb);
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/**
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* @brief Register touch-pad ISR.
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* The handler will be attached to the same CPU core that this function is running on.
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* @param fn Pointer to ISR handler
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* @param arg Parameter for ISR
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* @return
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* - ESP_OK Success ;
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* - ESP_ERR_INVALID_ARG GPIO error
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* - ESP_ERR_NO_MEM No memory
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*/
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esp_err_t touch_pad_isr_register(intr_handler_t fn, void *arg);
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/**
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* @brief Set touch sensor measurement and sleep time.
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* Excessive total time will slow down the touch response.
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* Too small measurement time will not be sampled enough, resulting in inaccurate measurements.
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*
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* @note The greater the duty cycle of the measurement time, the more system power is consumed.
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* @param sleep_cycle The touch sensor will sleep after each measurement.
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* sleep_cycle decide the interval between each measurement.
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* t_sleep = sleep_cycle / (RTC_SLOW_CLK frequency).
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* The approximate frequency value of RTC_SLOW_CLK can be obtained using rtc_clk_slow_freq_get_hz function.
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* @param meas_cycle The duration of the touch sensor measurement.
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* t_meas = meas_cycle / 8M, the maximum measure time is 0xffff / 8M = 8.19 ms
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_set_meas_time(uint16_t sleep_cycle, uint16_t meas_cycle);
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/**
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* @brief Get touch sensor measurement and sleep time
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* @param sleep_cycle Pointer to accept sleep cycle number
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* @param meas_cycle Pointer to accept measurement cycle count.
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_get_meas_time(uint16_t *sleep_cycle, uint16_t *meas_cycle);
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/**
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* @brief Trigger a touch sensor measurement, only support in SW mode of FSM
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_sw_start(void);
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/**
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* @brief Set touch sensor interrupt threshold
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* @param touch_num touch pad index
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* @param threshold threshold of touchpad count, refer to touch_pad_set_trigger_mode to see how to set trigger mode.
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_set_thresh(touch_pad_t touch_num, uint16_t threshold);
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/**
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* @brief Get touch sensor interrupt threshold
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* @param touch_num touch pad index
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* @param threshold pointer to accept threshold
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_get_thresh(touch_pad_t touch_num, uint16_t *threshold);
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/**
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* @brief Set touch sensor interrupt trigger mode.
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* Interrupt can be triggered either when counter result is less than
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* threshold or when counter result is more than threshold.
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* @param mode touch sensor interrupt trigger mode
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_set_trigger_mode(touch_trigger_mode_t mode);
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/**
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* @brief Get touch sensor interrupt trigger mode
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* @param mode pointer to accept touch sensor interrupt trigger mode
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_get_trigger_mode(touch_trigger_mode_t *mode);
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/**
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* @brief Set touch sensor interrupt trigger source. There are two sets of touch signals.
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* Set1 and set2 can be mapped to several touch signals. Either set will be triggered
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* if at least one of its touch signal is 'touched'. The interrupt can be configured to be generated
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* if set1 is triggered, or only if both sets are triggered.
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* @param src touch sensor interrupt trigger source
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_set_trigger_source(touch_trigger_src_t src);
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/**
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* @brief Get touch sensor interrupt trigger source
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* @param src pointer to accept touch sensor interrupt trigger source
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_get_trigger_source(touch_trigger_src_t *src);
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/**
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* @brief Set touch sensor group mask.
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* Touch pad module has two sets of signals, 'Touched' signal is triggered only if
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* at least one of touch pad in this group is "touched".
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* This function will set the register bits according to the given bitmask.
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* @param set1_mask bitmask of touch sensor signal group1, it's a 10-bit value
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* @param set2_mask bitmask of touch sensor signal group2, it's a 10-bit value
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* @param en_mask bitmask of touch sensor work enable, it's a 10-bit value
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_set_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask);
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/**
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* @brief Get touch sensor group mask.
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* @param set1_mask pointer to accept bitmask of touch sensor signal group1, it's a 10-bit value
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* @param set2_mask pointer to accept bitmask of touch sensor signal group2, it's a 10-bit value
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* @param en_mask pointer to accept bitmask of touch sensor work enable, it's a 10-bit value
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_get_group_mask(uint16_t *set1_mask, uint16_t *set2_mask, uint16_t *en_mask);
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/**
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* @brief Clear touch sensor group mask.
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* Touch pad module has two sets of signals, Interrupt is triggered only if
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* at least one of touch pad in this group is "touched".
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* This function will clear the register bits according to the given bitmask.
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* @param set1_mask bitmask touch sensor signal group1, it's a 10-bit value
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* @param set2_mask bitmask touch sensor signal group2, it's a 10-bit value
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* @param en_mask bitmask of touch sensor work enable, it's a 10-bit value
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_ARG if argument is wrong
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*/
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esp_err_t touch_pad_clear_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask);
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/**
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* @brief To enable touch pad interrupt
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_intr_enable(void);
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/**
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* @brief To disable touch pad interrupt
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_intr_disable(void);
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/**
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* @brief To clear touch pad interrupt
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* @return
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* - ESP_OK on success
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*/
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esp_err_t touch_pad_intr_clear(void);
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/**
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* @brief set touch pad filter calibration period, in ms.
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* Need to call touch_pad_filter_start before all touch filter APIs
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* @param new_period_ms filter period, in ms
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE driver state error
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* - ESP_ERR_INVALID_ARG parameter error
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*/
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esp_err_t touch_pad_set_filter_period(uint32_t new_period_ms);
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/**
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* @brief get touch pad filter calibration period, in ms
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* Need to call touch_pad_filter_start before all touch filter APIs
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* @param p_period_ms pointer to accept period
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE driver state error
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* - ESP_ERR_INVALID_ARG parameter error
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*/
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esp_err_t touch_pad_get_filter_period(uint32_t *p_period_ms);
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/**
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* @brief start touch pad filter function
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* This API will start a filter to process the noise in order to prevent false triggering
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* when detecting slight change of capacitance.
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* Need to call touch_pad_filter_start before all touch filter APIs
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*
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* @note This filter uses FreeRTOS timer, which is dispatched from a task with
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* priority 1 by default on CPU 0. So if some application task with higher priority
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* takes a lot of CPU0 time, then the quality of data obtained from this filter will be affected.
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* You can adjust FreeRTOS timer task priority in menuconfig.
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* @param filter_period_ms filter calibration period, in ms
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG parameter error
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* - ESP_ERR_NO_MEM No memory for driver
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* - ESP_ERR_INVALID_STATE driver state error
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*/
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esp_err_t touch_pad_filter_start(uint32_t filter_period_ms);
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/**
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* @brief stop touch pad filter function
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* Need to call touch_pad_filter_start before all touch filter APIs
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE driver state error
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*/
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esp_err_t touch_pad_filter_stop(void);
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/**
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* @brief delete touch pad filter driver and release the memory
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* Need to call touch_pad_filter_start before all touch filter APIs
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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_STATE driver state error
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*/
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esp_err_t touch_pad_filter_delete(void);
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#ifdef __cplusplus
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}
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#endif |