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#define Set_Higher_Column_Start_Address_CMD 0x10
#define Set_Memory_Addressing_Mode_CMD 0x20
#define Set_Column_Address_CMD 0x21
#define Set_Page_Address_CMD 0x22
#define Set_Display_Start_Line_CMD 0x40
#define Set_Contrast_Control_CMD 0x81
#define Set_Charge_Pump_CMD 0x8D
#define Set_Segment_Remap_CMD 0xA0
#define Set_Entire_Display_ON_CMD 0xA4
#define Set_Normal_or_Inverse_Display_CMD 0xA6
#define Set_Multiplex_Ratio_CMD 0xA8
#define Set_Display_ON_or_OFF_CMD 0xAE
#define Set_Page_Start_Address_CMD 0xB0
#define Set_COM_Output_Scan_Direction_CMD 0xC0
#define Set_Display_Offset_CMD 0xD3
#define Set_Display_Clock_CMD 0xD5
#define Set_Pre_charge_Period_CMD 0xD9
#define Set_Common_HW_Config_CMD 0xDA
#define Set_VCOMH_Level_CMD 0xDB
#define Set_NOP_CMD 0xE3
#define Horizontal_Addressing_Mode 0x00
#define Vertical_Addressing_Mode 0x01
#define Page_Addressing_Mode 0x02
#define Disable_Charge_Pump 0x00
#define Enable_Charge_Pump 0x04
#define Column_Address_0_Mapped_to_SEG0 0x00
#define Column_Address_0_Mapped_to_SEG127 0x01
#define Normal_Display 0x00
#define Entire_Display_ON 0x01
#define Non_Inverted_Display 0x00
#define Inverted_Display 0x01
#define Display_OFF 0x00
#define Display_ON 0x01
#define Scan_from_COM0_to_63 0x00
#define Scan_from_COM63_to_0 0x08
#define x_size 128
#define x_max x_size
#define x_min 0
#define y_size 64
#define y_max 8
#define y_min 0
#define ON 1
#define OFF 0
#define YES 1
#define NO 0
#define HIGH 1
#define LOW 0
#define DAT 1
#define CMD 0
void setup_GPIOs(void);
void OLED_init(void);
void OLED_reset_sequence(void);