esp-idf/examples/system/deep_sleep/main/touch_wakeup.c

110 lines
4.2 KiB
C

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