icnt86.cpp

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#include "icnt86.h"
#include "esphome/core/log.h"
 
namespace esphome::icnt86 {
 
ESPHOME_LOG_TAG(TAG, "icnt86");
static constexpr uint16_t REG_TOUCH_NUM = 0x1001;
static constexpr uint16_t REG_POINT1 = 0x1002;
static constexpr uint8_t MAX_TOUCHES = 5;
static constexpr uint8_t POINT_SIZE = 7;
 
void ICNT86Touchscreen::setup() {
  ESP_LOGCONFIG(TAG, "Setting up icnt86 Touchscreen...");
 
  // Register interrupt pin
  if (this->interrupt_pin_ != nullptr) {
    this->interrupt_pin_->setup();
    this->attach_interrupt_(this->interrupt_pin_, gpio::INTERRUPT_FALLING_EDGE);
  }
 
  // Perform reset if necessary
  if (this->reset_pin_ != nullptr) {
    this->reset_pin_->setup();
    this->reset_pin_->digital_write(false);
    delay(10);
    this->reset_pin_->digital_write(true);
  }
 
  if (this->x_raw_max_ == this->x_raw_min_) {
    this->x_raw_max_ = this->display_->get_native_width();
  }
  if (this->y_raw_max_ == this->y_raw_min_) {
    this->y_raw_max_ = this->display_->get_native_height();
  }
}
 
void ICNT86Touchscreen::update_touches() {
  uint8_t buf[MAX_TOUCHES * POINT_SIZE] = {0};
  uint8_t mask[1] = {0x00};
 
  if (this->read_register16(REG_TOUCH_NUM, buf, 1) != i2c::ERROR_OK) {
    this->status_set_warning();
    this->skip_update_ = true;
    ESP_LOGW(TAG, "Failed to read touch count");
    return;
  }
  uint8_t touch_count = buf[0];
 
  if (touch_count == 0x00 || touch_count > MAX_TOUCHES) {  // No new touch
    this->status_clear_warning();
    return;
  }
  if (this->read_register16(REG_POINT1, buf, touch_count * POINT_SIZE) != i2c::ERROR_OK) {
    this->status_set_warning();
    this->skip_update_ = true;
    ESP_LOGW(TAG, "Failed to read touch points");
    return;
  }
  this->write_register16(REG_TOUCH_NUM, mask, 1);
  ESP_LOGV(TAG, "Touch count: %d", touch_count);
  this->status_clear_warning();
 
  for (uint8_t i = 0; i < touch_count; i++) {
    uint16_t x = ((uint16_t) buf[2 + 7 * i] << 8) + buf[1 + 7 * i];
    uint16_t y = ((uint16_t) buf[4 + 7 * i] << 8) + buf[3 + 7 * i];
    uint8_t pressure = buf[5 + 7 * i];
    uint8_t touch_id = buf[6 + 7 * i];
 
    // A zero-pressure report just means this point is no longer touched; skipping it here leaves is_touched_
    // false (when no other point is active) so send_touches_() reports the release as normal.
    if (pressure != 0) {
      this->add_raw_touch_position_(touch_id, x, y, pressure);
    }
  }
}
 
void ICNT86Touchscreen::dump_config() {
  ESP_LOGCONFIG(TAG, "icnt86 Touchscreen:");
  LOG_I2C_DEVICE(this);
  LOG_PIN("  Interrupt Pin: ", this->interrupt_pin_);
  LOG_PIN("  Reset Pin: ", this->reset_pin_);
}
 
}  // namespace esphome::icnt86