504 lines
20 KiB
C
504 lines
20 KiB
C
// Copyright 2015-2016 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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#ifndef _DRIVER_TOUCH_PAD_H_
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#define _DRIVER_TOUCH_PAD_H_
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "esp_intr.h"
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#include "esp_err.h"
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#include "esp_intr_alloc.h"
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#include "soc/touch_channel.h"
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typedef enum {
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TOUCH_PAD_NUM0 = 0, /*!< Touch pad channel 0 is GPIO4 */
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TOUCH_PAD_NUM1, /*!< Touch pad channel 1 is GPIO0 */
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TOUCH_PAD_NUM2, /*!< Touch pad channel 2 is GPIO2 */
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TOUCH_PAD_NUM3, /*!< Touch pad channel 3 is GPIO15*/
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TOUCH_PAD_NUM4, /*!< Touch pad channel 4 is GPIO13*/
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TOUCH_PAD_NUM5, /*!< Touch pad channel 5 is GPIO12*/
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TOUCH_PAD_NUM6, /*!< Touch pad channel 6 is GPIO14*/
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TOUCH_PAD_NUM7, /*!< Touch pad channel 7 is GPIO27*/
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TOUCH_PAD_NUM8, /*!< Touch pad channel 8 is GPIO32*/
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TOUCH_PAD_NUM9, /*!< Touch pad channel 9 is GPIO33*/
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TOUCH_PAD_MAX,
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} touch_pad_t;
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typedef enum {
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TOUCH_HVOLT_KEEP = -1, /*!<Touch sensor high reference voltage, no change */
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TOUCH_HVOLT_2V4 = 0, /*!<Touch sensor high reference voltage, 2.4V */
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TOUCH_HVOLT_2V5, /*!<Touch sensor high reference voltage, 2.5V */
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TOUCH_HVOLT_2V6, /*!<Touch sensor high reference voltage, 2.6V */
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TOUCH_HVOLT_2V7, /*!<Touch sensor high reference voltage, 2.7V */
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TOUCH_HVOLT_MAX,
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} touch_high_volt_t;
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typedef enum {
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TOUCH_LVOLT_KEEP = -1, /*!<Touch sensor low reference voltage, no change */
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TOUCH_LVOLT_0V5 = 0, /*!<Touch sensor low reference voltage, 0.5V */
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TOUCH_LVOLT_0V6, /*!<Touch sensor low reference voltage, 0.6V */
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TOUCH_LVOLT_0V7, /*!<Touch sensor low reference voltage, 0.7V */
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TOUCH_LVOLT_0V8, /*!<Touch sensor low reference voltage, 0.8V */
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TOUCH_LVOLT_MAX,
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} touch_low_volt_t;
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typedef enum {
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TOUCH_HVOLT_ATTEN_KEEP = -1, /*!<Touch sensor high reference voltage attenuation, no change */
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TOUCH_HVOLT_ATTEN_1V5 = 0, /*!<Touch sensor high reference voltage attenuation, 1.5V attenuation */
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TOUCH_HVOLT_ATTEN_1V, /*!<Touch sensor high reference voltage attenuation, 1.0V attenuation */
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TOUCH_HVOLT_ATTEN_0V5, /*!<Touch sensor high reference voltage attenuation, 0.5V attenuation */
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TOUCH_HVOLT_ATTEN_0V, /*!<Touch sensor high reference voltage attenuation, 0V attenuation */
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TOUCH_HVOLT_ATTEN_MAX,
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} touch_volt_atten_t;
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typedef enum {
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TOUCH_PAD_SLOPE_0 = 0, /*!<Touch sensor charge / discharge speed, always zero */
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TOUCH_PAD_SLOPE_1 = 1, /*!<Touch sensor charge / discharge speed, slowest */
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TOUCH_PAD_SLOPE_2 = 2, /*!<Touch sensor charge / discharge speed */
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TOUCH_PAD_SLOPE_3 = 3, /*!<Touch sensor charge / discharge speed */
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TOUCH_PAD_SLOPE_4 = 4, /*!<Touch sensor charge / discharge speed */
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TOUCH_PAD_SLOPE_5 = 5, /*!<Touch sensor charge / discharge speed */
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TOUCH_PAD_SLOPE_6 = 6, /*!<Touch sensor charge / discharge speed */
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TOUCH_PAD_SLOPE_7 = 7, /*!<Touch sensor charge / discharge speed, fast */
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TOUCH_PAD_SLOPE_MAX,
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} touch_cnt_slope_t;
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typedef enum {
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TOUCH_TRIGGER_BELOW = 0, /*!<Touch interrupt will happen if counter value is less than threshold.*/
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TOUCH_TRIGGER_ABOVE = 1, /*!<Touch interrupt will happen if counter value is larger than threshold.*/
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TOUCH_TRIGGER_MAX,
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} touch_trigger_mode_t;
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typedef enum {
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TOUCH_TRIGGER_SOURCE_BOTH = 0, /*!< wakeup interrupt is generated if both SET1 and SET2 are "touched"*/
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TOUCH_TRIGGER_SOURCE_SET1 = 1, /*!< wakeup interrupt is generated if SET1 is "touched"*/
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TOUCH_TRIGGER_SOURCE_MAX,
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} touch_trigger_src_t;
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typedef enum {
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TOUCH_PAD_TIE_OPT_LOW = 0, /*!<Initial level of charging voltage, low level */
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TOUCH_PAD_TIE_OPT_HIGH = 1, /*!<Initial level of charging voltage, high level */
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TOUCH_PAD_TIE_OPT_MAX,
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} touch_tie_opt_t;
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typedef enum {
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TOUCH_FSM_MODE_TIMER = 0, /*!<To start touch FSM by timer */
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TOUCH_FSM_MODE_SW, /*!<To start touch FSM by software trigger */
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TOUCH_FSM_MODE_MAX,
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} touch_fsm_mode_t;
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typedef intr_handle_t touch_isr_handle_t;
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#define TOUCH_PAD_SLEEP_CYCLE_DEFAULT (0x1000) /*!<The timer frequency is RTC_SLOW_CLK (can be 150k or 32k depending on the options), max value is 0xffff */
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#define TOUCH_PAD_MEASURE_CYCLE_DEFAULT (0xffff) /*!<The timer frequency is 8Mhz, the max value is 0xffff */
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#define TOUCH_FSM_MODE_DEFAULT (TOUCH_FSM_MODE_TIMER) /*!<The touch FSM my be started by the software or timer */
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#define TOUCH_TRIGGER_MODE_DEFAULT (TOUCH_TRIGGER_BELOW) /*!<Interrupts can be triggered if sensor value gets below or above threshold */
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#define TOUCH_TRIGGER_SOURCE_DEFAULT (TOUCH_TRIGGER_SOURCE_SET1) /*!<The wakeup trigger source can be SET1 or both SET1 and SET2 */
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#define TOUCH_PAD_BIT_MASK_MAX (0x3ff)
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/**
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* @brief Initialize touch module.
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* @return
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* - ESP_OK Success
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* - ESP_FAIL Touch pad init error
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*/
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esp_err_t touch_pad_init();
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/**
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* @brief Un-install touch pad driver.
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* @return
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* - ESP_OK Success
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* - ESP_FAIL Touch pad driver not initialized
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*/
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esp_err_t touch_pad_deinit();
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/**
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* @brief Configure touch pad interrupt threshold.
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* @param touch_num touch pad index
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* @param threshold interrupt threshold,
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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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* User can use this function to determine the interrupt trigger threshold.
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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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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Touch pad error
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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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* @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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* @return
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* - ESP_OK Success
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* - ESP_ERR_INVALID_ARG Touch pad error
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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 Register touch-pad ISR,
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* @note Deprecated function, users should replace this with touch_pad_isr_register,
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* because RTC modules share a same interrupt index.
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* @param fn Pointer to ISR handler
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* @param arg Parameter for ISR
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* @param unused Reserved, not used
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* @param handle_unused Reserved, not used
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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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*/
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esp_err_t touch_pad_isr_handler_register(void(*fn)(void *), void *arg, int unused, intr_handle_t *handle_unused) __attribute__ ((deprecated));
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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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*/
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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 Deregister the handler previously registered using touch_pad_isr_handler_register
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* @param fn handler function to call (as passed to touch_pad_isr_handler_register)
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* @param arg argument of the handler (as passed to touch_pad_isr_handler_register)
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* @return
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* - ESP_OK on success
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* - ESP_ERR_INVALID_STATE if a handler matching both fn and
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* arg isn't registered
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*/
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esp_err_t touch_pad_isr_deregister(void(*fn)(void *), void *arg);
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/**
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* @brief Set touch sensor measurement and sleep time
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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 Set touch sensor reference voltage, if the voltage gap between high and low reference voltage get less,
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* the charging and discharging time would be faster, accordingly, the counter value would be larger.
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* In the case of detecting very slight change of capacitance, we can narrow down the gap so as to increase
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* the sensitivity. On the other hand, narrow voltage gap would also introduce more noise, but we can use a
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* software filter to pre-process the counter value.
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* @param refh the value of DREFH
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* @param refl the value of DREFL
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* @param atten the attenuation on DREFH
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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_voltage(touch_high_volt_t refh, touch_low_volt_t refl, touch_volt_atten_t atten);
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/**
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* @brief Get touch sensor reference voltage,
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* @param refh pointer to accept DREFH value
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* @param refl pointer to accept DREFL value
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* @param atten pointer to accept the attenuation on DREFH
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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_voltage(touch_high_volt_t *refh, touch_low_volt_t *refl, touch_volt_atten_t *atten);
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/**
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* @brief Set touch sensor charge/discharge speed for each pad.
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* If the slope is 0, the counter would always be zero.
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* If the slope is 1, the charging and discharging would be slow, accordingly, the counter value would be small.
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* If the slope is set 7, which is the maximum value, the charging and discharging would be fast, accordingly, the
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* counter value would be larger.
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* @param touch_num touch pad index
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* @param slope touch pad charge/discharge speed
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* @param opt the initial voltage
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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_cnt_mode(touch_pad_t touch_num, touch_cnt_slope_t slope, touch_tie_opt_t opt);
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/**
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* @brief Get touch sensor charge/discharge speed for each pad
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* @param touch_num touch pad index
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* @param slope pointer to accept touch pad charge/discharge slope
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* @param opt pointer to accept the initial voltage
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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_cnt_mode(touch_pad_t touch_num, touch_cnt_slope_t *slope, touch_tie_opt_t *opt);
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/**
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* @brief Initialize touch pad GPIO
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* @param touch_num touch pad index
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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_io_init(touch_pad_t touch_num);
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/**
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* @brief Set touch sensor FSM mode, the test action can be triggered by the timer,
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* as well as by the software.
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* @param mode FSM 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_fsm_mode(touch_fsm_mode_t mode);
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/**
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* @brief Get touch sensor FSM mode
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* @param mode pointer to accept FSM 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_fsm_mode(touch_fsm_mode_t *mode);
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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();
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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 clear the touch status register, usually use this function in touch ISR to clear status.
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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_clear_status();
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/**
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* @brief Get the touch sensor status, usually used in ISR to decide which pads are 'touched'.
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* @return
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* - touch status
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*/
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uint32_t touch_pad_get_status();
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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();
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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();
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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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* If filter is not initialized, this API will initialize the filter with given period.
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* If filter is already initialized, this API will update the filter period.
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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();
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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();
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#ifdef __cplusplus
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}
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#endif
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#endif/*_DRIVER_TOUCH_PAD_H_*/
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