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define.h
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#ifndef DEFINE_H
#define DEFINE_H
#define SET_BIT_8(reg, bit) reg |= ((uint8_t) 1 << bit)
#define CLEAR_BIT_8(reg, bit) reg &= (~((uint8_t) 1 << bit))
#define INVERT_BIT_8(reg, bit) reg ^= ((uint8_t) 1 << bit)
#define BIT_IS_SET_8(reg, bit) ((reg & ((uint8_t) 1 << bit)) != 0)
#define IT_IS_CLEAR_8(reg, bit) ((reg & ((uint8_t) 1 << bit)) == 0)
//delays in microseconds
#define COMMAND_DELAY 40
#define ENABLE_PULSE_WIDTH 1
#define ENABLE_CYCLE_TIME 2
#define POWER_ON_DELAY 15000
#define ON 1
#define OFF 0
//control pins
#define RS_HIGH *(volatile uint8_t*)(0x25) |= ((uint8_t) 1 << 4);
#define RS_LOW *(volatile uint8_t*)(0x25) &= (~((uint8_t) 1 << 4));
#define ENABLE_HIGH *(volatile uint8_t*)(0x25) |= ((uint8_t) 1 << 3);
#define ENABLE_LOW *(volatile uint8_t*)(0x25) &= (~((uint8_t) 1 << 3));
#define READ_ON *(volatile uint8_t*)(0x25) |= ((uint8_t) 1 << 2);
#define WRITE_ON *(volatile uint8_t*)(0x25) &= (~((uint8_t) 1 << 2));
//main bit masks for command function
#define SCREEN_CLEAR (uint8_t) 0b00000001
#define CURSOR_RETURN (uint8_t) 0b00000010
#define INPUT_SET (uint8_t) 0b00000100
#define DISPLAY_SWITCH (uint8_t) 0b00001000
#define DISPLAY_ON (uint8_t) 0b00000100
#define DISPLAY_OFF (uint8_t) 0b00000000
#define CURSOR_ON (uint8_t) 0b00000010
#define CURSOR_OFF (uint8_t) 0b00000000
#define BLINK_ON (uint8_t) 0b00000001
#define BLINK_OFF (uint8_t) 0b00000000
#define SHIFT_LCD (uint8_t) 0b00010000
#define FUNCTION_SET (uint8_t) 0b00100000
#define CGRAM_AD_SET (uint8_t) 0b01000000
#define DDRAM_AD_SET (uint8_t) 0b10000000
//optional flags for command bit mask
#define INC_MODE_SET (uint8_t) 0b00000010
#define DEC_MODE_SET (uint8_t) 0b00000000
#define SHIFT_ACTION (uint8_t) 0b00000001
// commands
#define LCD_CLEARDISPLAY (uint8_t) 0x01
#define LCD_RETURNHOME (uint8_t) 0x02
#define LCD_ENTRYMODESET (uint8_t) 0x04
#define LCD_DISPLAYCONTROL (uint8_t) 0x08
#define LCD_CURSORSHIFT (uint8_t) 0x10
#define LCD_FUNCTIONSET (uint8_t) 0x20
#define LCD_SETCGRAMADDR (uint8_t) 0x40
#define LCD_SETDDRAMADDR (uint8_t) 0x80
// flags for display entry mode
#define LCD_ENTRYRIGHT (uint8_t) 0x00
#define LCD_ENTRYLEFT (uint8_t) 0x02
#define LCD_ENTRYSHIFTINCREMENT (uint8_t) 0x01
#define LCD_ENTRYSHIFTDECREMENT (uint8_t) 0x00
#define DISPLAY_SHIFT (uint8_t) 0b00001000
#define CURSOR_SHIFT (uint8_t) 0b00000000
#define RIGHT_SHIFT (uint8_t) 0b00000100
#define LEFT_SHIFT (uint8_t) 0b00000000
#define FULL_DATA_BUS (uint8_t) 0b00010000
#define HALF_DATA_BUS (uint8_t) 0b00000000
#define DOUBLE_ROW (uint8_t) 0b00001000
#define ONE_ROW (uint8_t) 0b00000000
#define FONT_5_10_STYLE (uint8_t) 0b00000100
#define FONT_5_7_STYLE (uint8_t) 0b00000000
#endif