Jesse Hillsandclydebarrow
f63f722afb
Co-authored-by: clydebarrow <2366188+clydebarrow@users.noreply.github.com>
123 lines
3.7 KiB
C++
123 lines
3.7 KiB
C++
#include "gt911_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 gt911 {
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static const char *const TAG = "gt911.touchscreen";
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static const uint8_t GET_TOUCH_STATE[2] = {0x81, 0x4E};
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static const uint8_t CLEAR_TOUCH_STATE[3] = {0x81, 0x4E, 0x00};
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static const uint8_t GET_TOUCHES[2] = {0x81, 0x4F};
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static const uint8_t GET_SWITCHES[2] = {0x80, 0x4D};
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static const size_t MAX_TOUCHES = 5; // max number of possible touches reported
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#define ERROR_CHECK(err) \
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if ((err) != i2c::ERROR_OK) { \
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ESP_LOGE(TAG, "Failed to communicate!"); \
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this->status_set_warning(); \
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return; \
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}
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void IRAM_ATTR HOT Store::gpio_intr(Store *store) { store->available = true; }
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void GT911Touchscreen::setup() {
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i2c::ErrorCode err;
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ESP_LOGCONFIG(TAG, "Setting up GT911 Touchscreen...");
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// datasheet says NOT to use pullup/down on the int line.
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this->interrupt_pin_->pin_mode(gpio::FLAG_INPUT);
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this->interrupt_pin_->setup();
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// check the configuration of the int line.
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uint8_t data;
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err = this->write(GET_SWITCHES, 2);
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if (err == i2c::ERROR_OK) {
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err = this->read(&data, 1);
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if (err == i2c::ERROR_OK) {
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ESP_LOGD(TAG, "Read from switches: 0x%02X", data);
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this->interrupt_pin_->attach_interrupt(Store::gpio_intr, &this->store_,
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(data & 1) ? gpio::INTERRUPT_FALLING_EDGE : gpio::INTERRUPT_RISING_EDGE);
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}
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}
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if (err != i2c::ERROR_OK) {
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ESP_LOGE(TAG, "Failed to communicate!");
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this->mark_failed();
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return;
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}
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ESP_LOGCONFIG(TAG, "GT911 Touchscreen setup complete");
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}
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void GT911Touchscreen::loop() {
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i2c::ErrorCode err;
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touchscreen::TouchPoint tp;
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uint8_t touch_state = 0;
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uint8_t data[MAX_TOUCHES + 1][8]; // 8 bytes each for each point, plus extra space for the key byte
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if (!this->store_.available)
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return;
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this->store_.available = false;
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err = this->write(GET_TOUCH_STATE, sizeof(GET_TOUCH_STATE), false);
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ERROR_CHECK(err);
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err = this->read(&touch_state, 1);
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ERROR_CHECK(err);
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this->write(CLEAR_TOUCH_STATE, sizeof(CLEAR_TOUCH_STATE));
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if ((touch_state & 0x80) == 0)
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return;
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uint8_t num_of_touches = touch_state & 0x07;
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if (num_of_touches == 0)
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this->send_release_();
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if (num_of_touches > MAX_TOUCHES) // should never happen
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return;
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err = this->write(GET_TOUCHES, sizeof(GET_TOUCHES), false);
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ERROR_CHECK(err);
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// num_of_touches is guaranteed to be 0..5. Also read the key data
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err = this->read(data[0], sizeof(data[0]) * num_of_touches + 1);
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ERROR_CHECK(err);
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for (uint8_t i = 0; i != num_of_touches; i++) {
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tp.id = data[i][0];
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uint16_t x = encode_uint16(data[i][2], data[i][1]);
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uint16_t y = encode_uint16(data[i][4], data[i][3]);
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switch (this->rotation_) {
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case touchscreen::ROTATE_0_DEGREES:
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tp.x = x;
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tp.y = y;
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break;
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case touchscreen::ROTATE_90_DEGREES:
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tp.x = y;
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tp.y = this->display_width_ - x;
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break;
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case touchscreen::ROTATE_180_DEGREES:
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tp.x = this->display_width_ - x;
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tp.y = this->display_height_ - y;
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break;
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case touchscreen::ROTATE_270_DEGREES:
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tp.x = this->display_height_ - y;
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tp.y = x;
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break;
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}
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this->defer([this, tp]() { this->send_touch_(tp); });
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}
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auto keys = data[num_of_touches][0];
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for (size_t i = 0; i != 4; i++) {
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for (auto *listener : this->button_listeners_)
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listener->update_button(i, (keys & (1 << i)) != 0);
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}
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}
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void GT911Touchscreen::dump_config() {
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ESP_LOGCONFIG(TAG, "GT911 Touchscreen:");
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LOG_I2C_DEVICE(this);
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LOG_PIN(" Interrupt Pin: ", this->interrupt_pin_);
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ESP_LOGCONFIG(TAG, " Rotation: %d", (int) this->rotation_);
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}
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} // namespace gt911
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} // namespace esphome
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