Merge pull request apache#18 from midokura/feature/esp-add_esp32_wifi…

…_component

Feature/esp add esp32 wifi component

arch/xtensa/include/esp32/driver/esp32/include/touch_sensor.h

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+// 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
+
+/**
+ * @brief Configure touch pad interrupt threshold.
+ *
+ * @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.
+ *
+ * @param touch_num touch pad index
+ * @param threshold interrupt threshold,
+ *
+ * @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, uint16_t threshold);
+
+/**
+ * @brief get touch sensor counter value.
+ *        Each touch sensor has a counter to count the number of charge/discharge cycles.
+ *        When the pad is not 'touched', we can get a number of the counter.
+ *        When the pad is 'touched', the value in counter will get smaller because of the larger equivalent capacitance.
+ *
+ * @note This API requests hardware measurement once. If IIR filter mode is enabled,
+ *       please use 'touch_pad_read_raw_data' interface instead.
+ *
+ * @param touch_num touch pad index
+ * @param touch_value pointer to accept touch sensor value
+ *
+ * @return
+ *     - ESP_OK Success
+ *     - ESP_ERR_INVALID_ARG Touch pad parameter error
+ *     - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
+ *     - ESP_FAIL Touch pad not initialized
+ */
+esp_err_t touch_pad_read(touch_pad_t touch_num, uint16_t * touch_value);
+
+/**
+ * @brief get filtered touch sensor counter value by IIR filter.
+ *
+ * @note touch_pad_filter_start has to be called before calling touch_pad_read_filtered.
+ *       This function can be called from ISR
+ *
+ * @param touch_num touch pad index
+ * @param touch_value pointer to accept touch sensor value
+ *
+ * @return
+ *     - ESP_OK Success
+ *     - ESP_ERR_INVALID_ARG Touch pad parameter error
+ *     - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
+ *     - ESP_FAIL Touch pad not initialized
+ */
+esp_err_t touch_pad_read_filtered(touch_pad_t touch_num, uint16_t *touch_value);
+
+/**
+ * @brief get raw data (touch sensor counter value) from IIR filter process.
+ *        Need not request hardware measurements.
+ *
+ * @note touch_pad_filter_start has to be called before calling touch_pad_read_raw_data.
+ *       This function can be called from ISR
+ *
+ * @param touch_num touch pad index
+ * @param touch_value pointer to accept touch sensor value
+ *
+ * @return
+ *     - ESP_OK Success
+ *     - ESP_ERR_INVALID_ARG Touch pad parameter error
+ *     - ESP_ERR_INVALID_STATE This touch pad hardware connection is error, the value of "touch_value" is 0.
+ *     - ESP_FAIL Touch pad not initialized
+ */
+esp_err_t touch_pad_read_raw_data(touch_pad_t touch_num, uint16_t *touch_value);
+
+/**
+  * @brief Callback function that is called after each IIR filter calculation.
+  * @note This callback is called in timer task in each filtering cycle.
+  * @note This callback should not be blocked.
+  * @param raw_value  The latest raw data(touch sensor counter value) that
+  *        points to all channels(raw_value[0..TOUCH_PAD_MAX-1]).
+  * @param filtered_value  The latest IIR filtered data(calculated from raw data) that
+  *        points to all channels(filtered_value[0..TOUCH_PAD_MAX-1]).
+  *
+  */
+typedef void (* filter_cb_t)(uint16_t *raw_value, uint16_t *filtered_value);
+
+/**
+ * @brief Register the callback function that is called after each IIR filter calculation.
+ * @note The 'read_cb' callback is called in timer task in each filtering cycle.
+ * @param read_cb  Pointer to filtered callback function.
+ *                 If the argument passed in is NULL, the callback will stop.
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_ARG set error
+ */
+esp_err_t touch_pad_set_filter_read_cb(filter_cb_t read_cb);
+
+/**
+ * @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
+ * @return
+ *     - ESP_OK Success ;
+ *     - ESP_ERR_INVALID_ARG GPIO error
+ *     - ESP_ERR_NO_MEM No memory
+ */
+esp_err_t touch_pad_isr_register(intr_handler_t fn, void* arg);
+
+/**
+ * @brief Set touch sensor measurement 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_cycle The duration of the touch sensor measurement.
+ *                   t_meas = meas_cycle / 8M, the maximum measure time is 0xffff / 8M = 8.19 ms
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_set_meas_time(uint16_t sleep_cycle, uint16_t meas_cycle);
+
+/**
+ * @brief Get touch sensor measurement and sleep time
+ * @param sleep_cycle  Pointer to accept sleep cycle number
+ * @param meas_cycle Pointer to accept measurement cycle count.
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_get_meas_time(uint16_t *sleep_cycle, uint16_t *meas_cycle);
+
+/**
+ * @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 interrupt threshold
+ * @param touch_num touch pad index
+ * @param threshold threshold of touchpad count, refer to touch_pad_set_trigger_mode to see how to set trigger mode.
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if argument is wrong
+ */
+esp_err_t touch_pad_set_thresh(touch_pad_t touch_num, uint16_t threshold);
+
+/**
+ * @brief Get touch sensor interrupt 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, uint16_t *threshold);
+
+/**
+ * @brief Set touch sensor interrupt trigger mode.
+ *        Interrupt can be triggered either when counter result is less than
+ *        threshold or when counter result is more than threshold.
+ * @param mode touch sensor interrupt trigger mode
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if argument is wrong
+ */
+esp_err_t touch_pad_set_trigger_mode(touch_trigger_mode_t mode);
+
+/**
+ * @brief Get touch sensor interrupt trigger mode
+ * @param mode pointer to accept touch sensor interrupt trigger mode
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_get_trigger_mode(touch_trigger_mode_t *mode);
+
+/**
+ * @brief Set touch sensor interrupt trigger source. There are two sets of touch signals.
+ *        Set1 and set2 can be mapped to several touch signals. Either set will be triggered
+ *        if at least one of its touch signal is 'touched'. The interrupt can be configured to be generated
+ *        if set1 is triggered, or only if both sets are triggered.
+ * @param src touch sensor interrupt trigger source
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if argument is wrong
+ */
+esp_err_t touch_pad_set_trigger_source(touch_trigger_src_t src);
+
+/**
+ * @brief Get touch sensor interrupt trigger source
+ * @param src pointer to accept touch sensor interrupt trigger source
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_get_trigger_source(touch_trigger_src_t *src);
+
+/**
+ * @brief Set touch sensor group mask.
+ *        Touch pad module has two sets of signals, 'Touched' signal is triggered only if
+ *        at least one of touch pad in this group is "touched".
+ *        This function will set the register bits according to the given bitmask.
+ * @param set1_mask bitmask of touch sensor signal group1, it's a 10-bit value
+ * @param set2_mask bitmask of touch sensor signal group2, it's a 10-bit value
+ * @param en_mask bitmask of touch sensor work enable, it's a 10-bit value
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if argument is wrong
+ */
+esp_err_t touch_pad_set_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask);
+
+/**
+ * @brief Get touch sensor group mask.
+ * @param set1_mask pointer to accept bitmask of touch sensor signal group1, it's a 10-bit value
+ * @param set2_mask pointer to accept bitmask of touch sensor signal group2, it's a 10-bit value
+ * @param en_mask pointer to accept bitmask of touch sensor work enable, it's a 10-bit value
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_get_group_mask(uint16_t *set1_mask, uint16_t *set2_mask, uint16_t *en_mask);
+
+/**
+ * @brief Clear touch sensor group mask.
+ *        Touch pad module has two sets of signals, Interrupt is triggered only if
+ *        at least one of touch pad in this group is "touched".
+ *        This function will clear the register bits according to the given bitmask.
+ * @param set1_mask bitmask touch sensor signal group1, it's a 10-bit value
+ * @param set2_mask bitmask touch sensor signal group2, it's a 10-bit value
+ * @param en_mask bitmask of touch sensor work enable, it's a 10-bit value
+ * @return
+ *      - ESP_OK on success
+ *      - ESP_ERR_INVALID_ARG if argument is wrong
+ */
+esp_err_t touch_pad_clear_group_mask(uint16_t set1_mask, uint16_t set2_mask, uint16_t en_mask);
+
+/**
+ * @brief To enable touch pad interrupt
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_intr_enable(void);
+
+/**
+ * @brief To disable touch pad interrupt
+ * @return
+ *      - ESP_OK on success
+ */
+esp_err_t touch_pad_intr_disable(void);
+
+/**
+ * @brief set touch pad filter calibration period, in ms.
+ *        Need to call touch_pad_filter_start before all touch filter APIs
+ * @param new_period_ms filter period, in ms
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_STATE driver state error
+ *      - ESP_ERR_INVALID_ARG parameter error
+ */
+esp_err_t touch_pad_set_filter_period(uint32_t new_period_ms);
+
+/**
+ * @brief get touch pad filter calibration period, in ms
+ *        Need to call touch_pad_filter_start before all touch filter APIs
+ * @param p_period_ms pointer to accept period
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_STATE driver state error
+ *      - ESP_ERR_INVALID_ARG parameter error
+ */
+esp_err_t touch_pad_get_filter_period(uint32_t* p_period_ms);
+
+/**
+ * @brief start touch pad filter function
+ *      This API will start a filter to process the noise in order to prevent false triggering
+ *      when detecting slight change of capacitance.
+ *      Need to call touch_pad_filter_start before all touch filter APIs
+ *
+ * @note This filter uses FreeRTOS timer, which is dispatched from a task with
+ *       priority 1 by default on CPU 0. So if some application task with higher priority
+ *       takes a lot of CPU0 time, then the quality of data obtained from this filter will be affected.
+ *       You can adjust FreeRTOS timer task priority in menuconfig.
+ * @param filter_period_ms filter calibration period, in ms
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_ARG parameter error
+ *      - ESP_ERR_NO_MEM No memory for driver
+ *      - ESP_ERR_INVALID_STATE driver state error
+ */
+esp_err_t touch_pad_filter_start(uint32_t filter_period_ms);
+
+/**
+ * @brief stop touch pad filter function
+ *        Need to call touch_pad_filter_start before all touch filter APIs
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_STATE driver state error
+ */
+esp_err_t touch_pad_filter_stop(void);
+
+/**
+ * @brief delete touch pad filter driver and release the memory
+ *        Need to call touch_pad_filter_start before all touch filter APIs
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_STATE driver state error
+ */
+esp_err_t touch_pad_filter_delete(void);
+
+#ifdef __cplusplus
+}
+#endif