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This commit is contained in:
J. Nick Koston
378
esphome/components/esp32_touch/esp32_touch_v2.cpp
Normal file
378
esphome/components/esp32_touch/esp32_touch_v2.cpp
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#if defined(USE_ESP32_VARIANT_ESP32S2) || defined(USE_ESP32_VARIANT_ESP32S3)
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#include "esp32_touch.h"
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#include "esphome/core/application.h"
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#include "esphome/core/log.h"
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#include "esphome/core/hal.h"
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#include <algorithm>
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#include <cinttypes>
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// Include HAL for ISR-safe touch reading
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#include "hal/touch_sensor_ll.h"
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// Include for RTC clock frequency
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#include "soc/rtc.h"
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// Include for ISR-safe printing
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#include "rom/ets_sys.h"
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namespace esphome {
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namespace esp32_touch {
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static const char *const TAG = "esp32_touch";
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void ESP32TouchComponent::setup() {
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ESP_LOGCONFIG(TAG, "Running setup for ESP32-S2/S3");
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touch_pad_init();
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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// Create queue for touch events
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size_t queue_size = this->children_.size() * 4;
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if (queue_size < 8)
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queue_size = 8;
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this->touch_queue_ = xQueueCreate(queue_size, sizeof(TouchPadEvent));
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if (this->touch_queue_ == nullptr) {
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ESP_LOGE(TAG, "Failed to create touch event queue of size %d", queue_size);
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this->mark_failed();
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return;
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}
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// Set up filtering if configured
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if (this->filter_configured_()) {
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touch_filter_config_t filter_info = {
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.mode = this->filter_mode_,
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.debounce_cnt = this->debounce_count_,
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.noise_thr = this->noise_threshold_,
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.jitter_step = this->jitter_step_,
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.smh_lvl = this->smooth_level_,
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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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}
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if (this->denoise_configured_()) {
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touch_pad_denoise_t denoise = {
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.grade = this->grade_,
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.cap_level = this->cap_level_,
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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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}
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if (this->waterproof_configured_()) {
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touch_pad_waterproof_t waterproof = {
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.guard_ring_pad = this->waterproof_guard_ring_pad_,
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.shield_driver = this->waterproof_shield_driver_,
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};
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touch_pad_waterproof_set_config(&waterproof);
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touch_pad_waterproof_enable();
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}
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// Configure measurement parameters
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touch_pad_set_charge_discharge_times(this->meas_cycle_);
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touch_pad_set_measurement_interval(this->sleep_cycle_);
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touch_pad_set_voltage(this->high_voltage_reference_, this->low_voltage_reference_, this->voltage_attenuation_);
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// Set up the channel mask for all configured pads
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uint16_t channel_mask = 0;
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for (auto *child : this->children_) {
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channel_mask |= BIT(child->get_touch_pad());
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}
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touch_pad_set_channel_mask(channel_mask);
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// Configure each touch pad
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for (auto *child : this->children_) {
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// Initialize the touch pad
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touch_pad_config(child->get_touch_pad());
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// Set threshold
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if (child->get_threshold() != 0) {
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touch_pad_set_thresh(child->get_touch_pad(), child->get_threshold());
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}
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}
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// Configure timeout
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touch_pad_timeout_set(true, TOUCH_PAD_THRESHOLD_MAX);
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// Register ISR handler with all interrupts
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esp_err_t err =
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touch_pad_isr_register(touch_isr_handler, this, static_cast<touch_pad_intr_mask_t>(TOUCH_PAD_INTR_MASK_ALL));
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if (err != ESP_OK) {
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ESP_LOGE(TAG, "Failed to register touch ISR: %s", esp_err_to_name(err));
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vQueueDelete(this->touch_queue_);
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this->touch_queue_ = nullptr;
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this->mark_failed();
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return;
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}
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// Calculate release timeout based on sleep cycle
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uint32_t rtc_freq = rtc_clk_slow_freq_get_hz();
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this->release_timeout_ms_ = (this->sleep_cycle_ * 1000 * 3) / (rtc_freq * 2);
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if (this->release_timeout_ms_ < 100) {
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this->release_timeout_ms_ = 100;
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}
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this->release_check_interval_ms_ = std::min(this->release_timeout_ms_ / 4, (uint32_t) 50);
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// Enable the interrupts we need
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touch_pad_intr_enable(static_cast<touch_pad_intr_mask_t>(TOUCH_PAD_INTR_MASK_ACTIVE | TOUCH_PAD_INTR_MASK_INACTIVE |
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TOUCH_PAD_INTR_MASK_TIMEOUT));
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// Start the FSM after all configuration is complete
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touch_pad_fsm_start();
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}
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void ESP32TouchComponent::dump_config() {
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const char *lv_s = get_low_voltage_reference_str(this->low_voltage_reference_);
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const char *hv_s = get_high_voltage_reference_str(this->high_voltage_reference_);
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const char *atten_s = get_voltage_attenuation_str(this->voltage_attenuation_);
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ESP_LOGCONFIG(TAG,
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"Config for ESP32 Touch Hub:\n"
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" Meas cycle: %.2fms\n"
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" Sleep cycle: %.2fms\n"
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" Low Voltage Reference: %s\n"
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" High Voltage Reference: %s\n"
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" Voltage Attenuation: %s\n"
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" ISR Configuration:\n"
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" Release timeout: %" PRIu32 "ms\n"
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" Release check interval: %" PRIu32 "ms",
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this->meas_cycle_ / (8000000.0f / 1000.0f), this->sleep_cycle_ / (150000.0f / 1000.0f), lv_s, hv_s,
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atten_s, this->release_timeout_ms_, this->release_check_interval_ms_);
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if (this->filter_configured_()) {
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const char *filter_mode_s;
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switch (this->filter_mode_) {
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case TOUCH_PAD_FILTER_IIR_4:
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filter_mode_s = "IIR_4";
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break;
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case TOUCH_PAD_FILTER_IIR_8:
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filter_mode_s = "IIR_8";
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break;
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case TOUCH_PAD_FILTER_IIR_16:
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filter_mode_s = "IIR_16";
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break;
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case TOUCH_PAD_FILTER_IIR_32:
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filter_mode_s = "IIR_32";
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break;
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case TOUCH_PAD_FILTER_IIR_64:
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filter_mode_s = "IIR_64";
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break;
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case TOUCH_PAD_FILTER_IIR_128:
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filter_mode_s = "IIR_128";
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break;
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case TOUCH_PAD_FILTER_IIR_256:
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filter_mode_s = "IIR_256";
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break;
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case TOUCH_PAD_FILTER_JITTER:
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filter_mode_s = "JITTER";
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break;
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default:
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filter_mode_s = "UNKNOWN";
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break;
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}
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ESP_LOGCONFIG(TAG,
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" Filter mode: %s\n"
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" Debounce count: %" PRIu32 "\n"
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" Noise threshold coefficient: %" PRIu32 "\n"
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" Jitter filter step size: %" PRIu32,
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filter_mode_s, this->debounce_count_, this->noise_threshold_, this->jitter_step_);
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const char *smooth_level_s;
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switch (this->smooth_level_) {
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case TOUCH_PAD_SMOOTH_OFF:
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smooth_level_s = "OFF";
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break;
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case TOUCH_PAD_SMOOTH_IIR_2:
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smooth_level_s = "IIR_2";
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break;
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case TOUCH_PAD_SMOOTH_IIR_4:
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smooth_level_s = "IIR_4";
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break;
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case TOUCH_PAD_SMOOTH_IIR_8:
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smooth_level_s = "IIR_8";
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break;
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default:
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smooth_level_s = "UNKNOWN";
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break;
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}
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ESP_LOGCONFIG(TAG, " Smooth level: %s", smooth_level_s);
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}
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if (this->denoise_configured_()) {
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const char *grade_s;
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switch (this->grade_) {
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case TOUCH_PAD_DENOISE_BIT12:
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grade_s = "BIT12";
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break;
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case TOUCH_PAD_DENOISE_BIT10:
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grade_s = "BIT10";
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break;
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case TOUCH_PAD_DENOISE_BIT8:
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grade_s = "BIT8";
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break;
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case TOUCH_PAD_DENOISE_BIT4:
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grade_s = "BIT4";
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break;
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default:
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grade_s = "UNKNOWN";
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break;
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}
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ESP_LOGCONFIG(TAG, " Denoise grade: %s", grade_s);
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const char *cap_level_s;
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switch (this->cap_level_) {
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case TOUCH_PAD_DENOISE_CAP_L0:
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cap_level_s = "L0";
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break;
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case TOUCH_PAD_DENOISE_CAP_L1:
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cap_level_s = "L1";
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break;
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case TOUCH_PAD_DENOISE_CAP_L2:
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cap_level_s = "L2";
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break;
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case TOUCH_PAD_DENOISE_CAP_L3:
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cap_level_s = "L3";
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break;
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case TOUCH_PAD_DENOISE_CAP_L4:
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cap_level_s = "L4";
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break;
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case TOUCH_PAD_DENOISE_CAP_L5:
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cap_level_s = "L5";
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break;
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case TOUCH_PAD_DENOISE_CAP_L6:
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cap_level_s = "L6";
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break;
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case TOUCH_PAD_DENOISE_CAP_L7:
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cap_level_s = "L7";
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break;
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default:
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cap_level_s = "UNKNOWN";
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break;
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}
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ESP_LOGCONFIG(TAG, " Denoise capacitance level: %s", cap_level_s);
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}
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if (this->setup_mode_) {
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ESP_LOGCONFIG(TAG, " Setup Mode ENABLED");
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}
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for (auto *child : this->children_) {
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LOG_BINARY_SENSOR(" ", "Touch Pad", child);
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ESP_LOGCONFIG(TAG, " Pad: T%" PRIu32, (uint32_t) child->get_touch_pad());
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ESP_LOGCONFIG(TAG, " Threshold: %" PRIu32, child->get_threshold());
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}
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}
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void ESP32TouchComponent::loop() {
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const uint32_t now = App.get_loop_component_start_time();
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bool should_print = this->setup_mode_ && now - this->setup_mode_last_log_print_ > 250;
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// Print debug info for all pads in setup mode
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if (should_print) {
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for (auto *child : this->children_) {
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uint32_t value = 0;
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touch_pad_read_raw_data(child->get_touch_pad(), &value);
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child->value_ = value;
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ESP_LOGD(TAG, "Touch Pad '%s' (T%" PRIu32 "): %" PRIu32, child->get_name().c_str(),
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(uint32_t) child->get_touch_pad(), value);
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}
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this->setup_mode_last_log_print_ = now;
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}
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// Process any queued touch events from interrupts
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TouchPadEvent event;
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while (xQueueReceive(this->touch_queue_, &event, 0) == pdTRUE) {
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// Handle timeout events
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if (event.intr_mask & TOUCH_PAD_INTR_MASK_TIMEOUT) {
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// Resume measurement after timeout
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touch_pad_timeout_resume();
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continue;
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}
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// Handle active/inactive events
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if (event.intr_mask & (TOUCH_PAD_INTR_MASK_ACTIVE | TOUCH_PAD_INTR_MASK_INACTIVE)) {
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// Process touch status for each pad
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for (auto *child : this->children_) {
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touch_pad_t pad = child->get_touch_pad();
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// Check if this pad is in the status mask
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if (event.pad_status & BIT(pad)) {
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// Read current value
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uint32_t value = 0;
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if (this->filter_configured_()) {
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touch_pad_filter_read_smooth(pad, &value);
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} else {
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touch_pad_read_raw_data(pad, &value);
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}
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child->value_ = value;
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// For S2/S3, higher value means touched
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bool is_touched = (event.intr_mask & TOUCH_PAD_INTR_MASK_ACTIVE) != 0;
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if (is_touched != child->last_state_) {
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child->last_state_ = is_touched;
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child->publish_state(is_touched);
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ESP_LOGV(TAG, "Touch Pad '%s' state: %s (value: %" PRIu32 ", threshold: %" PRIu32 ")",
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child->get_name().c_str(), is_touched ? "ON" : "OFF", value, child->get_threshold());
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}
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}
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}
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}
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}
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}
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void ESP32TouchComponent::on_shutdown() {
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// Disable interrupts
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touch_pad_intr_disable(static_cast<touch_pad_intr_mask_t>(TOUCH_PAD_INTR_MASK_ACTIVE | TOUCH_PAD_INTR_MASK_INACTIVE |
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TOUCH_PAD_INTR_MASK_TIMEOUT));
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touch_pad_isr_deregister(touch_isr_handler, this);
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if (this->touch_queue_) {
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vQueueDelete(this->touch_queue_);
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}
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// Check if any pad is configured for wakeup
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bool is_wakeup_source = false;
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for (auto *child : this->children_) {
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if (child->get_wakeup_threshold() != 0) {
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if (!is_wakeup_source) {
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is_wakeup_source = true;
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// Touch sensor FSM mode must be 'TOUCH_FSM_MODE_TIMER' to use it to wake-up.
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touch_pad_set_fsm_mode(TOUCH_FSM_MODE_TIMER);
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}
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}
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}
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if (!is_wakeup_source) {
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touch_pad_deinit();
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}
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}
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void IRAM_ATTR ESP32TouchComponent::touch_isr_handler(void *arg) {
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ESP32TouchComponent *component = static_cast<ESP32TouchComponent *>(arg);
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BaseType_t xHigherPriorityTaskWoken = pdFALSE;
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// Read interrupt status and pad status
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TouchPadEvent event;
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event.intr_mask = touch_pad_read_intr_status_mask();
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event.pad_status = touch_pad_get_status();
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event.pad = touch_pad_get_current_meas_channel();
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// Send event to queue for processing in main loop
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xQueueSendFromISR(component->touch_queue_, &event, &xHigherPriorityTaskWoken);
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if (xHigherPriorityTaskWoken) {
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portYIELD_FROM_ISR();
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}
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}
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bool ESP32TouchComponent::filter_configured_() const { return this->filter_mode_ != TOUCH_PAD_FILTER_MAX; }
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bool ESP32TouchComponent::denoise_configured_() const { return this->grade_ != TOUCH_PAD_DENOISE_MAX; }
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bool ESP32TouchComponent::waterproof_configured_() const { return this->waterproof_guard_ring_pad_ != TOUCH_PAD_MAX; }
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} // namespace esp32_touch
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} // namespace esphome
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#endif // USE_ESP32_VARIANT_ESP32S2 || USE_ESP32_VARIANT_ESP32S3
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