gt911.h

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#pragma once
 
#include "driver/i2c_master.h"
#include "esp_err.h"
 
#include "touch_types.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* Register map (only what this driver needs). */
#define GT911_REG_COMMAND       0x8040
#define GT911_REG_CONFIG        0x8047
#define GT911_REG_X_MAX         0x8048
#define GT911_REG_Y_MAX         0x804A
#define GT911_REG_PRODUCT_ID    0x8140
#define GT911_REG_FW_VERSION    0x8144
#define GT911_REG_STATUS        0x814E
#define GT911_REG_POINT0        0x814F
 
#define GT911_STATUS_READY      0x80
#define GT911_STATUS_COUNT_MASK 0x0F
#define GT911_POINT_STRIDE      8
 
typedef struct gt911_dev_t *gt911_handle_t;
 
typedef struct {
    uint16_t i2c_addr;      
    uint32_t scl_speed_hz;  
} gt911_config_t;

esp_err_t gt911_new(i2c_master_bus_handle_t bus, const gt911_config_t *cfg,
                    gt911_handle_t *out);
 
esp_err_t gt911_del(gt911_handle_t h);

uint16_t gt911_address(gt911_handle_t h);

esp_err_t gt911_info(gt911_handle_t h, char product_id[5], uint16_t *fw_version);

esp_err_t gt911_resolution(gt911_handle_t h, uint16_t *x_max, uint16_t *y_max);

esp_err_t gt911_read(gt911_handle_t h, touch_point_t *out, int max,
                     int *count, bool *fresh);
 
#ifdef __cplusplus
}
#endif