#ifndef __SSD1306_H__
#define __SSD1306_H__

#include <driver/spi_master.h>


void i2c_master_init();
esp_err_t oled_ssd1306_init();


// I2C CONFIG
#define I2C_MASTER_NUM    I2C_NUM_1             /*!< I2C port number for master dev */
#define I2C_MASTER_TX_BUF_DISABLE   0           /*!< I2C master do not need buffer */
#define I2C_MASTER_RX_BUF_DISABLE   0           /*!< I2C master do not need buffer */

#define SSD1306_OLED_ADDR  0x3C                 /*!< slave address for ssd1306 oled display */
#define WRITE_BIT  I2C_MASTER_WRITE             /*!< I2C master write */
#define READ_BIT   I2C_MASTER_READ              /*!< I2C master read */
#define ACK_CHECK_EN   0x1                      /*!< I2C master will check ack from slave*/
#define ACK_CHECK_DIS  0x0                      /*!< I2C master will not check ack from slave */
#define ACK_VAL    0x0                          /*!< I2C ack value */
#define NACK_VAL   0x1                          /*!< I2C nack value */

// Control bytes (page 20)
#define COMMAND_MODE 0x00
#define SINGLE_COMMAND_MODE 0x80
#define DATA_MODE 0x40

// Fundamental Command (page 28)
#define DISPLAY_LINE_START 0x40
#define CONTRAST_CONTROL 0x81
#define DISABLE_ENTIRE_DISPLAY 0xA4
#define DISPLAY_ON_REG02 0xA5
#define NORMAL_DISPLAY 0xA6
#define DISPLAY_INVERSE  0xA7
#define DISPLAY_RESET 0xAE
#define DISPLAY_ON 0xAF

// Hardware Config (page 31)
#define DISPLAY_START_LINE 0x40
#define SEGMENT_REMAP 0xA0
#define MULTIPLEX_RATIO 0xA8
#define COM_OUTPUT_SCAN_DIR 0xC0
#define DISPLAY_OFFSET 0xD3
#define COM_PINS_HARDWARE_CONFIG 0xDA

// Timing & Driving Scheme (page 32)
#define DISPLAY_CLK_RATIO 0xD5
#define PRE_CHARGE_PER 0xD9
#define VCOMH_DESELECT_LEVEL 0xDB
#define NOOPERATION 0xE3

// Charge Pump (page 60)
#define CHARGE_PUMP_SET 0x8D


#endif