display.h

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/***************************************************************************/
 
#ifndef DISPLAY_H
#define DISPLAY_H
 
#include <stdint.h>
#include "no_os_gpio.h"
#include "no_os_spi.h"

struct display_dev {
    uint8_t                    cols_nb;
    uint8_t                    rows_nb;
    const struct display_controller_ops *controller_ops;
    void                       *extra;
};
struct display_dev {…};

struct display_init_param {
    uint8_t                    cols_nb;
    uint8_t                    rows_nb;
    const struct display_controller_ops *controller_ops;
    void                       *extra;
};
struct display_init_param {…};

struct display_controller_ops {
    int32_t (*init)(struct display_dev *);
    int32_t (*display_on_off)(struct display_dev *, uint8_t);
    int32_t (*move_cursor)(struct display_dev *, uint8_t, uint8_t);
    int32_t (*print_char)(struct display_dev *, uint8_t, uint8_t,
                  uint8_t);
    int32_t (*remove)(struct display_dev *);
};
struct display_controller_ops {…};

int32_t display_init(struct display_dev **device,
             const struct display_init_param *param);
 
/* Frees the resources allocated by display_init(). */
int32_t display_remove(struct display_dev *device);

int32_t display_on(struct display_dev *device);

int32_t display_off(struct display_dev *device);

int32_t display_move_cursor(struct display_dev *device, uint8_t row,
                uint8_t column);

int32_t display_clear(struct display_dev *device);

int32_t display_print_string(struct display_dev *device, char *msg,
                 uint8_t row, uint8_t column);

int32_t display_print_char(struct display_dev *device, char chr,
               uint8_t row, uint8_t column);
 
#endif