xpt2046.h

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#pragma once

#include "esphome/core/component.h"
#include "esphome/core/automation.h"
#include "esphome/components/spi/spi.h"
#include "esphome/components/touchscreen/touchscreen.h"
#include "esphome/core/helpers.h"
#include "esphome/core/log.h"

namespace esphome {
namespace xpt2046 {

using namespace touchscreen;

struct XPT2046TouchscreenStore {
  volatile bool touch;
  static void gpio_intr(XPT2046TouchscreenStore *store);
};

class XPT2046Component : public Touchscreen,
                         public PollingComponent,
                         public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
                                               spi::CLOCK_PHASE_LEADING, spi::DATA_RATE_2MHZ> {
 public:
  void set_dimensions(int16_t x, int16_t y) {
    this->display_width_ = x;
    this->display_height_ = y;
  }
  void set_calibration(int16_t x_min, int16_t x_max, int16_t y_min, int16_t y_max);
  void set_swap_x_y(bool val) { this->swap_x_y_ = val; }

  void set_report_interval(uint32_t interval) { this->report_millis_ = interval; }
  uint32_t get_report_interval() { return this->report_millis_; }

  void set_threshold(int16_t threshold) { this->threshold_ = threshold; }
  void set_irq_pin(InternalGPIOPin *pin) { this->irq_pin_ = pin; }

  void setup() override;
  void dump_config() override;
  float get_setup_priority() const override;

  void loop() override;

  void update() override;

  int16_t x{0}, y{0};
  bool touched{false};

  int16_t x_raw{0}, y_raw{0}, z_raw{0};
 protected:
  static int16_t best_two_avg(int16_t x, int16_t y, int16_t z);
  static int16_t normalize(int16_t val, int16_t min_val, int16_t max_val);

  int16_t read_adc_(uint8_t ctrl);
  void check_touch_();

  int16_t threshold_;
  int16_t x_raw_min_, x_raw_max_, y_raw_min_, y_raw_max_;

  bool invert_x_, invert_y_;
  bool swap_x_y_;

  uint32_t report_millis_;
  uint32_t last_pos_ms_{0};

  InternalGPIOPin *irq_pin_{nullptr};
  XPT2046TouchscreenStore store_;
};

}  // namespace xpt2046
}  // namespace esphome