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107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
#pragma once
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#include "esphome/core/component.h"
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#include "esphome/core/automation.h"
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#include "esphome/components/spi/spi.h"
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#include "esphome/components/touchscreen/touchscreen.h"
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#include "esphome/core/helpers.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace xpt2046 {
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using namespace touchscreen;
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struct XPT2046TouchscreenStore {
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volatile bool touch;
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static void gpio_intr(XPT2046TouchscreenStore *store);
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};
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class XPT2046Component : public Touchscreen,
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public PollingComponent,
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public spi::SPIDevice<spi::BIT_ORDER_MSB_FIRST, spi::CLOCK_POLARITY_LOW,
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spi::CLOCK_PHASE_LEADING, spi::DATA_RATE_2MHZ> {
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public:
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/// Set the logical touch screen dimensions.
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void set_dimensions(int16_t x, int16_t y) {
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this->display_width_ = x;
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this->display_height_ = y;
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}
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/// Set the coordinates for the touch screen edges.
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void set_calibration(int16_t x_min, int16_t x_max, int16_t y_min, int16_t y_max);
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/// If true the x and y axes will be swapped
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void set_swap_x_y(bool val) { this->swap_x_y_ = val; }
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/// Set the interval to report the touch point perodically.
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void set_report_interval(uint32_t interval) { this->report_millis_ = interval; }
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uint32_t get_report_interval() { return this->report_millis_; }
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/// Set the threshold for the touch detection.
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void set_threshold(int16_t threshold) { this->threshold_ = threshold; }
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/// Set the pin used to detect the touch.
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void set_irq_pin(InternalGPIOPin *pin) { this->irq_pin_ = pin; }
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void setup() override;
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void dump_config() override;
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float get_setup_priority() const override;
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/** Detect the touch if the irq pin is specified.
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*
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* If the touch is detected and the component does not already know about it
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* the update() is called immediately. If the irq pin is not specified
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* the loop() is a no-op.
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*/
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void loop() override;
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/** Read and process the values from the hardware.
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*
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* Read the raw x, y and touch pressure values from the chip, detect the touch,
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* and if touched, transform to the user x and y coordinates. If the state has
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* changed or if the value should be reported again due to the
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* report interval, run the action and inform the virtual buttons.
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*/
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void update() override;
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/**@{*/
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/** Coordinates of the touch position.
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*
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* The values are set immediately before the on_state action with touched == true
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* is triggered. The action with touched == false sends the coordinates of the last
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* reported touch.
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*/
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int16_t x{0}, y{0};
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/**@}*/
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/// True if the component currently detects the touch
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bool touched{false};
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/**@{*/
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/** Raw sensor values of the coordinates and the pressure.
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*
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* The values are set each time the update() method is called.
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*/
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int16_t x_raw{0}, y_raw{0}, z_raw{0};
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/**@}*/
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protected:
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static int16_t best_two_avg(int16_t x, int16_t y, int16_t z);
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static int16_t normalize(int16_t val, int16_t min_val, int16_t max_val);
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int16_t read_adc_(uint8_t ctrl);
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void check_touch_();
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int16_t threshold_;
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int16_t x_raw_min_, x_raw_max_, y_raw_min_, y_raw_max_;
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bool invert_x_, invert_y_;
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bool swap_x_y_;
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uint32_t report_millis_;
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uint32_t last_pos_ms_{0};
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InternalGPIOPin *irq_pin_{nullptr};
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XPT2046TouchscreenStore store_;
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};
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} // namespace xpt2046
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} // namespace esphome
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