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https://github.com/espressif/esp-idf.git
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110 lines
4.2 KiB
C
110 lines
4.2 KiB
C
/*
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* SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include <stdio.h>
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#include <inttypes.h>
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#include "esp_sleep.h"
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#include "sdkconfig.h"
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#include "driver/rtc_io.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#ifdef CONFIG_EXAMPLE_TOUCH_WAKEUP
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#include "driver/touch_pad.h"
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#if CONFIG_IDF_TARGET_ESP32
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#define TOUCH_THRESH_NO_USE 0
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static void calibrate_touch_pad(touch_pad_t pad)
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{
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int avg = 0;
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const size_t calibration_count = 128;
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for (int i = 0; i < calibration_count; ++i) {
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uint16_t val;
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touch_pad_read(pad, &val);
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avg += val;
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}
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avg /= calibration_count;
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const int min_reading = 300;
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if (avg < min_reading) {
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printf("Touch pad #%d average reading is too low: %d (expecting at least %d). "
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"Not using for deep sleep wakeup.\n", pad, avg, min_reading);
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touch_pad_config(pad, 0);
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} else {
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int threshold = avg - 100;
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printf("Touch pad #%d average: %d, wakeup threshold set to %d.\n", pad, avg, threshold);
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touch_pad_config(pad, threshold);
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}
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}
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#endif
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void example_deep_sleep_register_touch_wakeup(void)
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{
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#if CONFIG_IDF_TARGET_ESP32
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// Initialize touch pad peripheral.
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// The default fsm mode is software trigger mode.
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ESP_ERROR_CHECK(touch_pad_init());
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// If use touch pad wake up, should set touch sensor FSM mode at 'TOUCH_FSM_MODE_TIMER'.
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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// Set reference voltage for charging/discharging
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// In this case, the high reference valtage will be 2.4V - 1V = 1.4V
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// The low reference voltage will be 0.5
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// The larger the range, the larger the pulse count value.
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touch_pad_set_voltage(TOUCH_HVOLT_2V4, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_1V);
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//init RTC IO and mode for touch pad.
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touch_pad_config(TOUCH_PAD_NUM8, TOUCH_THRESH_NO_USE);
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touch_pad_config(TOUCH_PAD_NUM9, TOUCH_THRESH_NO_USE);
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calibrate_touch_pad(TOUCH_PAD_NUM8);
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calibrate_touch_pad(TOUCH_PAD_NUM9);
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#elif CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3
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/* Initialize touch pad peripheral. */
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touch_pad_init();
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/* Only support one touch channel in sleep mode. */
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touch_pad_config(TOUCH_PAD_NUM9);
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/* Denoise setting at TouchSensor 0. */
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touch_pad_denoise_t denoise = {
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/* The bits to be cancelled are determined according to the noise level. */
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.grade = TOUCH_PAD_DENOISE_BIT4,
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.cap_level = TOUCH_PAD_DENOISE_CAP_L4,
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};
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touch_pad_denoise_set_config(&denoise);
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touch_pad_denoise_enable();
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printf("Denoise function init\n");
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/* Filter setting */
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touch_filter_config_t filter_info = {
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.mode = TOUCH_PAD_FILTER_IIR_16,
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.debounce_cnt = 1, // 1 time count.
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.noise_thr = 0, // 50%
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.jitter_step = 4, // use for jitter mode.
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.smh_lvl = TOUCH_PAD_SMOOTH_IIR_2,
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};
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touch_pad_filter_set_config(&filter_info);
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touch_pad_filter_enable();
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printf("touch pad filter init %d\n", TOUCH_PAD_FILTER_IIR_8);
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/* Set sleep touch pad. */
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touch_pad_sleep_channel_enable(TOUCH_PAD_NUM9, true);
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touch_pad_sleep_channel_enable_proximity(TOUCH_PAD_NUM9, false);
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/* Reducing the operating frequency can effectively reduce power consumption. */
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touch_pad_sleep_channel_set_work_time(1000, TOUCH_PAD_MEASURE_CYCLE_DEFAULT);
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/* Enable touch sensor clock. Work mode is "timer trigger". */
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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touch_pad_fsm_start();
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vTaskDelay(100 / portTICK_PERIOD_MS);
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/* set touchpad wakeup threshold */
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uint32_t touch_value, wake_threshold;
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touch_pad_sleep_channel_read_smooth(TOUCH_PAD_NUM9, &touch_value);
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wake_threshold = touch_value * 0.1; // wakeup when touch sensor crosses 10% of background level
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touch_pad_sleep_set_threshold(TOUCH_PAD_NUM9, wake_threshold);
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printf("Touch pad #%d average: %"PRIu32", wakeup threshold set to %"PRIu32"\n",
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TOUCH_PAD_NUM9, touch_value, (uint32_t)(touch_value * 0.1));
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#endif
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printf("Enabling touch pad wakeup\n");
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ESP_ERROR_CHECK(esp_sleep_enable_touchpad_wakeup());
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ESP_ERROR_CHECK(esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON));
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}
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#endif // CONFIG_EXAMPLE_TOUCH_WAKEUP
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