gt911_emu.h

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#pragma once
 
#include <stdbool.h>
#include <stdint.h>
 
#ifdef __cplusplus
extern "C" {
#endif

#define GT911_EMU_ADDR        0x14u

#define GT911_EMU_PRODUCT_ID  "9INJ"

#define GT911_EMU_REG_COMMAND 0x8040u  
#define GT911_EMU_REG_PRODUCT 0x8140u  
#define GT911_EMU_REG_STATUS  0x814Eu  
#define GT911_EMU_REG_POINT1  0x814Fu  

#define GT911_EMU_READY       0x80u

#define GT911_EMU_SIZE        24u

#define GT911_EMU_POINTS      5u

#define GT911_EMU_STRIDE      8u

typedef struct {
    uint8_t  id;   
    uint16_t x;    
    uint16_t y;    
} gt911_emu_point_t;

typedef struct {
    uint8_t           n;                      
    gt911_emu_point_t pt[GT911_EMU_POINTS];   
} gt911_emu_frame_t;

typedef struct {
    uint16_t res_x;          
    uint16_t res_y;          
 
    uint8_t  command[2];     
    uint16_t ptr;            
    uint8_t  wbytes;         
    bool     reading;        
    bool     busy;           
 
    uint8_t  status;         
    uint8_t  point[GT911_EMU_POINTS * GT911_EMU_STRIDE];
 
    /* Counted by the byte functions, read by the injector.  Each wraps. */
    uint32_t reads;          
    uint32_t acks;           
    uint32_t product_reads;  
} gt911_emu_t;

void gt911_emu_init(gt911_emu_t *e, uint16_t res_x, uint16_t res_y);

void gt911_emu_rx(gt911_emu_t *e, uint8_t b);

uint8_t gt911_emu_tx(gt911_emu_t *e);

void gt911_emu_finish(gt911_emu_t *e);

uint8_t gt911_emu_peek(const gt911_emu_t *e, uint16_t reg);

bool gt911_emu_publish(gt911_emu_t *e, const gt911_emu_frame_t *f);

bool gt911_emu_withdraw(gt911_emu_t *e);
 
#ifdef __cplusplus
}
#endif