initial commit

components/cst9217/cst9217_touchscreen.h

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+// cst9217.h
+#include "esphome/core/component.h"
+#include "esphome/components/i2c/i2c.h"
+#include "esphome/components/touchscreen/touchscreen.h"
+
+/* CST9217 registers */
+#define ESP_LCD_TOUCH_CST9217_DATA_REG 0xD000
+#define ESP_LCD_TOUCH_CST9217_PROJECT_ID_REG 0xD204
+#define ESP_LCD_TOUCH_CST9217_CMD_MODE_REG   0xD101
+#define ESP_LCD_TOUCH_CST9217_CHECKCODE_REG  0xD1FC
+#define ESP_LCD_TOUCH_CST9217_RESOLUTION_REG 0xD1F8
+
+/* CST9217 parameters */
+#define CST9217_CHIP_ID 0x9217
+#define CST9217_ACK_VALUE 0xAB
+#define CST9217_MAX_TOUCH_POINTS 1
+#define CST9217_DATA_LENGTH (CST9217_MAX_TOUCH_POINTS * 5 + 5)
+
+namespace esphome {
+namespace cst9217 {
+
+static const char *const TAG = "cst9217.touchscreen";
+
+
+class CST9217Touchscreen : public touchscreen::Touchscreen, public i2c::I2CDevice {
+ public:
+  void setup() override;
+  void dump_config() override;
+
+  void update_touches() override;
+
+  void set_interrupt_pin(InternalGPIOPin *pin) { this->interrupt_pin_ = pin; }
+  void set_reset_pin(GPIOPin *pin) { this->reset_pin_ = pin; }
+
+ protected:
+  void CST9217Touchscreen::reset_device_();
+  // Internal buffer to read touch data
+  uint8_t touch_data_[CST9217_DATA_LENGTH]; // Sufficient for 2 touch points (8 bytes each) + header
+  InternalGPIOPin *interrupt_pin_{};
+  GPIOPin *reset_pin_{};
+  uint16_t chip_id_;
+  uint16_t touch_res_x_;
+  uint16_t touch_res_y_;
+  uint16_t touch_project_id_;
+};
+
+} // namespace cst9217
+} // namespace esphome
+