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69 lines
1.6 KiB
C
69 lines
1.6 KiB
C
#include <avr/io.h>
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#include <util/delay.h>
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/* LCD with 4 bit mode for an ATMEGA32P processor
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_ LCD _ _ ATMEGA32P (arduino)_
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1 VSS -> GND
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2 VDD -> +5V
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3 V0 -> Potentiometer
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4 RS -> PortB4 (Pin 12 arduino)
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5 RW -> GND
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6 E -> PortB3 (Pin 11 arduino)
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(7 - 10) -> ...
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11 D4 -> PortD5 (Pin 5 arduino)
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12 D5 -> PortD4 (Pin 4 arduino)
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13 D6 -> PortD3 (Pin 3 arduino)
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14 D7 -> PortD2 (Pin 2 arduino)
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15 A -> +5v with resistor
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16 K -> GND
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*/
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// LCD display size
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#define LCD_START_LINE1 0x00
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#define LCD_START_LINE2 0x40
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// LCD ports/pins/ddr
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#define LCD_RS_PORT PORTB
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#define LCD_RS_PIN 4
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#define LCD_RS_DDR DDRB
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#define LCD_E_PORT PORTB
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#define LCD_E_PIN 3
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#define LCD_E_DDR DDRB
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#define LCD_D4_PORT PORTD
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#define LCD_D4_PIN 5
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#define LCD_D4_DDR DDRD
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#define LCD_D5_PORT PORTD
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#define LCD_D5_PIN 4
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#define LCD_D5_DDR DDRD
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#define LCD_D6_PORT PORTD
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#define LCD_D6_PIN 3
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#define LCD_D6_DDR DDRD
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#define LCD_D7_PORT PORTD
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#define LCD_D7_PIN 2
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#define LCD_D7_DDR DDRD
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//LCD instructions (see LCD-1602A datasheet)
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#define LCD_CLEAR 0b00000001
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#define LCD_HOME 0b00000010
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#define LCD_ENTRY_MODE 0b00000110
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#define LCD_DISPLAY_ON 0b00001100
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#define LCD_DISPLAY_OFF 0b00001000
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#define LCD_CURSOR_SET 0b10000000
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#define LCD_FUNCTION_SET_8bit 0b00110000
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#define LCD_FUNCTION_SET_4bit 0b00101000
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// Functions
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void dinit(void);
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void lcd_init(void);
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void lcd_write(uint8_t);
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void lcd_cmd(uint8_t);
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void lcd_char(uint8_t);
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void lcd_string(uint8_t *);
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