Add TT21100 touchscreen component (#4793)

Co-authored-by: Rajan Patel <rpatel3001@gmail.com>
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/tt21100/touchscreen/__init__.py

@@ -0,0 +1,44 @@
+import esphome.codegen as cg
+import esphome.config_validation as cv
+
+from esphome import pins
+from esphome.components import i2c, touchscreen
+from esphome.const import CONF_ID, CONF_INTERRUPT_PIN, CONF_RESET_PIN
+
+from .. import tt21100_ns
+
+DEPENDENCIES = ["i2c"]
+
+TT21100Touchscreen = tt21100_ns.class_(
+    "TT21100Touchscreen",
+    touchscreen.Touchscreen,
+    cg.Component,
+    i2c.I2CDevice,
+)
+TT21100ButtonListener = tt21100_ns.class_("TT21100ButtonListener")
+
+CONFIG_SCHEMA = touchscreen.TOUCHSCREEN_SCHEMA.extend(
+    cv.Schema(
+        {
+            cv.GenerateID(): cv.declare_id(TT21100Touchscreen),
+            cv.Required(CONF_INTERRUPT_PIN): pins.internal_gpio_input_pin_schema,
+            cv.Optional(CONF_RESET_PIN): pins.gpio_output_pin_schema,
+        }
+    )
+    .extend(i2c.i2c_device_schema(0x24))
+    .extend(cv.COMPONENT_SCHEMA)
+)
+
+
+async def to_code(config):
+    var = cg.new_Pvariable(config[CONF_ID])
+    await cg.register_component(var, config)
+    await i2c.register_i2c_device(var, config)
+    await touchscreen.register_touchscreen(var, config)
+
+    interrupt_pin = await cg.gpio_pin_expression(config[CONF_INTERRUPT_PIN])
+    cg.add(var.set_interrupt_pin(interrupt_pin))
+
+    if CONF_RESET_PIN in config:
+        rts_pin = await cg.gpio_pin_expression(config[CONF_RESET_PIN])
+        cg.add(var.set_reset_pin(rts_pin))

esphome/components/tt21100/touchscreen/tt21100.cpp

@@ -0,0 +1,175 @@
+#include "tt21100.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace tt21100 {
+
+static const char *const TAG = "tt21100";
+
+static const uint8_t MAX_BUTTONS = 4;
+static const uint8_t MAX_TOUCH_POINTS = 5;
+static const uint8_t MAX_DATA_LEN = (7 + MAX_TOUCH_POINTS * 10);  // 7 Header + (Points * 10 data bytes)
+
+struct TT21100ButtonReport {
+  uint16_t length;     // Always 14 (0x000E)
+  uint8_t report_id;   // Always 0x03
+  uint16_t timestamp;  // Number in units of 100 us
+  uint8_t btn_value;   // Only use bit 0..3
+  uint16_t btn_signal[MAX_BUTTONS];
+} __attribute__((packed));
+
+struct TT21100TouchRecord {
+  uint8_t : 5;
+  uint8_t touch_type : 3;
+  uint8_t tip : 1;
+  uint8_t event_id : 2;
+  uint8_t touch_id : 5;
+  uint16_t x;
+  uint16_t y;
+  uint8_t pressure;
+  uint16_t major_axis_length;
+  uint8_t orientation;
+} __attribute__((packed));
+
+struct TT21100TouchReport {
+  uint16_t length;
+  uint8_t report_id;
+  uint16_t timestamp;
+  uint8_t : 2;
+  uint8_t large_object : 1;
+  uint8_t record_num : 5;
+  uint8_t report_counter : 2;
+  uint8_t : 3;
+  uint8_t noise_effect : 3;
+  TT21100TouchRecord touch_record[MAX_TOUCH_POINTS];
+} __attribute__((packed));
+
+void TT21100TouchscreenStore::gpio_intr(TT21100TouchscreenStore *store) { store->touch = true; }
+
+float TT21100Touchscreen::get_setup_priority() const { return setup_priority::HARDWARE - 1.0f; }
+
+void TT21100Touchscreen::setup() {
+  ESP_LOGCONFIG(TAG, "Setting up TT21100 Touchscreen...");
+
+  // Register interrupt pin
+  this->interrupt_pin_->pin_mode(gpio::FLAG_INPUT | gpio::FLAG_PULLUP);
+  this->interrupt_pin_->setup();
+  this->store_.pin = this->interrupt_pin_->to_isr();
+  this->interrupt_pin_->attach_interrupt(TT21100TouchscreenStore::gpio_intr, &this->store_,
+                                         gpio::INTERRUPT_FALLING_EDGE);
+
+  // Perform reset if necessary
+  if (this->reset_pin_ != nullptr) {
+    this->reset_pin_->setup();
+    this->reset_();
+  }
+
+  // Update display dimensions if they were updated during display setup
+  this->display_width_ = this->display_->get_width();
+  this->display_height_ = this->display_->get_height();
+  this->rotation_ = static_cast<TouchRotation>(this->display_->get_rotation());
+
+  // Trigger initial read to activate the interrupt
+  this->store_.touch = true;
+}
+
+void TT21100Touchscreen::loop() {
+  if (!this->store_.touch)
+    return;
+  this->store_.touch = false;
+
+  // Read report length
+  uint16_t data_len;
+  this->read((uint8_t *) &data_len, sizeof(data_len));
+
+  // Read report data
+  uint8_t data[MAX_DATA_LEN];
+  if (data_len > 0 && data_len < sizeof(data)) {
+    this->read(data, data_len);
+
+    if (data_len == 14) {
+      // Button event
+      auto *report = (TT21100ButtonReport *) data;
+
+      ESP_LOGV(TAG, "Button report: Len=%d, ID=%d, Time=%5u, Value=[%u], Signal=[%04X][%04X][%04X][%04X]",
+               report->length, report->report_id, report->timestamp, report->btn_value, report->btn_signal[0],
+               report->btn_signal[1], report->btn_signal[2], report->btn_signal[3]);
+
+      for (uint8_t i = 0; i < 4; i++) {
+        for (auto *listener : this->button_listeners_)
+          listener->update_button(i, report->btn_signal[i]);
+      }
+
+    } else if (data_len >= 7) {
+      // Touch point event
+      auto *report = (TT21100TouchReport *) data;
+
+      ESP_LOGV(TAG,
+               "Touch report: Len=%d, ID=%d, Time=%5u, LargeObject=%u, RecordNum=%u, RecordCounter=%u, NoiseEffect=%u",
+               report->length, report->report_id, report->timestamp, report->large_object, report->record_num,
+               report->report_counter, report->noise_effect);
+
+      uint8_t touch_count = (data_len - (sizeof(*report) - sizeof(report->touch_record))) / sizeof(TT21100TouchRecord);
+
+      if (touch_count == 0) {
+        for (auto *listener : this->touch_listeners_)
+          listener->release();
+        return;
+      }
+
+      for (int i = 0; i < touch_count; i++) {
+        auto *touch = &report->touch_record[i];
+
+        ESP_LOGV(TAG,
+                 "Touch %d: Type=%u, Tip=%u, EventId=%u, TouchId=%u, X=%u, Y=%u, Pressure=%u, MajorAxisLen=%u, "
+                 "Orientation=%u",
+                 i, touch->touch_type, touch->tip, touch->event_id, touch->touch_id, touch->x, touch->y,
+                 touch->pressure, touch->major_axis_length, touch->orientation);
+
+        TouchPoint tp;
+        switch (this->rotation_) {
+          case ROTATE_0_DEGREES:
+            // Origin is top right, so mirror X by default
+            tp.x = this->display_width_ - touch->x;
+            tp.y = touch->y;
+            break;
+          case ROTATE_90_DEGREES:
+            tp.x = touch->y;
+            tp.y = touch->x;
+            break;
+          case ROTATE_180_DEGREES:
+            tp.x = touch->x;
+            tp.y = this->display_height_ - touch->y;
+            break;
+          case ROTATE_270_DEGREES:
+            tp.x = this->display_height_ - touch->y;
+            tp.y = this->display_width_ - touch->x;
+            break;
+        }
+        tp.id = touch->tip;
+        tp.state = touch->pressure;
+
+        this->defer([this, tp]() { this->send_touch_(tp); });
+      }
+    }
+  }
+}
+
+void TT21100Touchscreen::reset_() {
+  if (this->reset_pin_ != nullptr) {
+    this->reset_pin_->digital_write(false);
+    delay(10);
+    this->reset_pin_->digital_write(true);
+    delay(10);
+  }
+}
+
+void TT21100Touchscreen::dump_config() {
+  ESP_LOGCONFIG(TAG, "TT21100 Touchscreen:");
+  LOG_I2C_DEVICE(this);
+  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
+  LOG_PIN("  Reset Pin: ", this->reset_pin_);
+}
+
+}  // namespace tt21100
+}  // namespace esphome

esphome/components/tt21100/touchscreen/tt21100.h

@@ -0,0 +1,49 @@
+#pragma once
+
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/touchscreen/touchscreen.h"
+#include "esphome/core/component.h"
+#include "esphome/core/hal.h"
+
+namespace esphome {
+namespace tt21100 {
+
+using namespace touchscreen;
+
+struct TT21100TouchscreenStore {
+  volatile bool touch;
+  ISRInternalGPIOPin pin;
+
+  static void gpio_intr(TT21100TouchscreenStore *store);
+};
+
+class TT21100ButtonListener {
+ public:
+  virtual void update_button(uint8_t index, uint16_t state) = 0;
+};
+
+class TT21100Touchscreen : public Touchscreen, public Component, public i2c::I2CDevice {
+ public:
+  void setup() override;
+  void loop() override;
+  void dump_config() override;
+  float get_setup_priority() const override;
+
+  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
+  void set_reset_pin(GPIOPin *pin) { this->reset_pin_ = pin; }
+
+  void register_button_listener(TT21100ButtonListener *listener) { this->button_listeners_.push_back(listener); }
+
+ protected:
+  void reset_();
+
+  TT21100TouchscreenStore store_;
+
+  InternalGPIOPin *interrupt_pin_;
+  GPIOPin *reset_pin_{nullptr};
+
+  std::vector<TT21100ButtonListener *> button_listeners_;
+};
+
+}  // namespace tt21100
+}  // namespace esphome