mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
112 lines
4.3 KiB
C
112 lines
4.3 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 voltage 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());
|
|
#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 // CONFIG_EXAMPLE_TOUCH_WAKEUP
|