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/* ... */
#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"7 includes
#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
ESP_ERROR_CHECK(touch_pad_init());
touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
touch_pad_set_voltage(TOUCH_HVOLT_2V4, TOUCH_LVOLT_0V5, TOUCH_HVOLT_ATTEN_1V);
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
touch_pad_init();
touch_pad_config(TOUCH_PAD_NUM9);
touch_pad_denoise_t denoise = {
.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");
touch_filter_config_t filter_info = {
.mode = TOUCH_PAD_FILTER_IIR_16,
.debounce_cnt = 1,
.noise_thr = 0,
.jitter_step = 4,
.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);
touch_pad_sleep_channel_enable(TOUCH_PAD_NUM9, true);
touch_pad_sleep_channel_enable_proximity(TOUCH_PAD_NUM9, false);
touch_pad_sleep_channel_set_work_time(1000, TOUCH_PAD_MEASURE_CYCLE_DEFAULT);
touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
touch_pad_fsm_start();
vTaskDelay(100 / portTICK_PERIOD_MS);
uint32_t touch_value, wake_threshold;
touch_pad_sleep_channel_read_smooth(TOUCH_PAD_NUM9, &touch_value);
wake_threshold = touch_value * 0.1;
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());
#if SOC_PM_SUPPORT_RTC_PERIPH_PD
ESP_ERROR_CHECK(esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON));
#endif
}{ ... }
#endif/* ... */