commit 3f358c19e5fe1d48285c4a9b3930a942f2f866fe
parent ae4f92b170a05c4c62c335aa17d64f5f95860010
Author: Vineet K <git@vineetk.net>
Date: Sat, 20 Apr 2024 15:42:35 -0400
import lcd.c from lab 10
Diffstat:
| M | lcd.c | | | 181 | ++++++++++++++++++++++++++++++++++++++++++++++++------------------------------- |
1 file changed, 110 insertions(+), 71 deletions(-)
diff --git a/lcd.c b/lcd.c
@@ -1,89 +1,127 @@
-#include <avr/io.h>
-
-#define F_CPU 16000000UL
-#include <util/delay.h>
-
-// Define LCD control pin connections
-#define LCD_RS_PIN PB0
-#define LCD_RW_PIN PB1
-#define LCD_E_PIN PB2
-#define LCD_RS_PORT PORTB
-#define LCD_RW_PORT PORTB
-#define LCD_E_PORT PORTB
-// Define LCD data pin connections
-#define LCD_DATA_PORT PORTD
-#define LCD_DATA_DDR DDRD
-
-// Function prototypes
-void LCD_init();
-void LCD_command(uint8_t cmd);
-void LCD_write(uint8_t data);
-void LCD_send(char* str);
-
-int
-main()
-{
- // Set control pins as outputs
- DDRB |= (1 << LCD_RS_PIN) | (1 << LCD_RW_PIN) | (1 << LCD_E_PIN);
- // Set data pins as outputs
- LCD_DATA_DDR = 0xFF;
+#include <avr/io.h> //standard AVR header
- // Initialize LCD
- LCD_init();
+#define F_CPU 16000000UL // THE CPU FREQUENCY
+#include <util/delay.h> //delay header
- // Display "Hello, World!"
- LCD_send("Hello, World!");
+#define LCD_DPRT PORTD //LCD DATA PORT
+#define LCD_DDDR DDRD //LCD DATA DDR
+#define LCD_DPIN PIND //LCD DATA PIN
+#define LCD_CPRT PORTB //LCD COMMANDS PORT
+#define LCD_CDDR DDRB //LCD COMMANDS DDR
+#define LCD_CPIN PINB //LCD COMMANDS PIN
+#define LCD_RS 0 //LCD RS
+#define LCD_EN 1 //LCD EN
- for (;;) {
- // Your main code here
- }
+void lcd_putValue(unsigned char val){
+ LCD_DPRT &= 0x0F;
+ LCD_DPRT |= (val&0xF0); //send cmnd to data port
+ LCD_CPRT |= (1<<LCD_EN); //EN = 1 for H-to-L pulse
+ _delay_us(1); //wait to make enable wide
+ LCD_CPRT &= ~ (1<<LCD_EN); //EN = 0 for H-to-L pulse
+ _delay_us(100); //wait to make enable wide
- return 0;
+ LCD_DPRT &= 0x0F;
+ LCD_DPRT |= val<<4; //send cmnd to data port
+ LCD_CPRT |= (1<<LCD_EN); //EN = 1 for H-to-L pulse
+ _delay_us(1); //wait to make enable wide
+ LCD_CPRT &= ~ (1<<LCD_EN); //EN = 0 for H-to-L pulse
+ _delay_us(100); //wait to make enable wide
}
-// Initialize LCD
-void
-LCD_init()
+//*******************************************************
+void lcdCommand( unsigned char cmnd ){
+ LCD_CPRT &= ~ (1<<LCD_RS); //RS = 0 for command
+ lcd_putValue(cmnd);
+}
+
+//*******************************************************
+void lcdData( unsigned char data )
{
- _delay_ms(15); // Delay for power-on
- LCD_command(0x38); // Function Set: 8-bit data, 2-line display, 5x8 font
- LCD_command(0x0C); // Display ON, Cursor OFF, Blink OFF
- LCD_command(0x01); // Clear display
- _delay_ms(2); // Delay for Clear Display command
- LCD_command(0x06); // Entry Mode Set: Increment cursor, No display shift
+ LCD_CPRT |= (1<<LCD_RS); //RS = 1 for data
+ lcd_putValue(data);
}
-// Send command to LCD
-void
-LCD_command(uint8_t cmd)
+void lcd_clear()
{
- LCD_RS_PORT &= ~(1 << LCD_RS_PIN); // Set RS low for command mode
- LCD_RW_PORT &= ~(1 << LCD_RW_PIN); // Set RW low for write mode
- LCD_DATA_PORT = cmd; // Send command to data port
- LCD_E_PORT |= (1 << LCD_E_PIN); // Enable LCD
- _delay_us(1); // Short delay
- LCD_E_PORT &= ~(1 << LCD_E_PIN); // Disable LCD
- _delay_us(100); // Delay for command execution
+ lcdCommand(0x01);
+ _delay_us(1700);
}
-// Write data to LCD
-void
-LCD_write(uint8_t data)
+void lcd_showCursor()
{
- LCD_RS_PORT |= (1 << LCD_RS_PIN); // Set RS high for data mode
- LCD_RW_PORT &= ~(1 << LCD_RW_PIN); // Set RW low for write mode
- LCD_DATA_PORT = data; // Send data to data port
- LCD_E_PORT |= (1 << LCD_E_PIN); // Enable LCD
- _delay_us(1); // Short delay
- LCD_E_PORT &= ~(1 << LCD_E_PIN); // Disable LCD
- _delay_us(100); // Delay for data execution
+ lcdCommand(0x0E);
+ _delay_us(50);
}
-// Send string to LCD
-void
-LCD_send(char *str)
+void lcd_hideCursor()
{
- while (*str)
- LCD_write(*str++);
+ lcdCommand(0x0C);
+ _delay_us(50);
}
+//*******************************************************
+void lcd_init()
+{
+ LCD_DDDR |= 0xF0;
+ LCD_CDDR |= (1<<LCD_RS)|(1<<LCD_EN);
+
+ LCD_CPRT &=~(1<<LCD_EN); //LCD_EN = 0
+ _delay_us(2000); //wait for init.
+
+ lcdCommand(0x33); //send $33 for init.
+ lcdCommand(0x32); //send $32 for init
+ lcdCommand(0x28); //init. LCD 2 line,5*7 matrix
+ lcdCommand(0x0e); //display on, cursor on
+ lcdCommand(0x06); //shift cursor right
+
+ lcd_clear();
+}
+
+//*******************************************************
+void lcd_gotoxy(unsigned char x, unsigned char y)
+{
+ unsigned char firstCharAdr[]={0x80,0xC0,0x94,0xD4};//Table 12-4
+ lcdCommand(firstCharAdr[y-1] + x - 1);
+ _delay_us(100);
+}
+
+//*******************************************************
+void lcd_print( char * str )
+{
+ unsigned char i = 0;
+
+ while(str[i] != 0) //while it is not end of string
+ {
+ lcdData(str[i]);
+ i++ ;
+ }
+}
+
+//*******************************************************
+int main(void)
+{
+ lcd_init();
+ lcd_hideCursor();
+
+ while(1)
+ {
+ lcd_clear();
+ lcd_gotoxy(1,1);
+ lcd_print("The world is but");
+ lcd_gotoxy(1,2);
+ lcd_print("one country");
+
+ lcd_showCursor();
+ _delay_ms(2500);
+
+ lcd_clear();
+
+ lcd_gotoxy(1,1);
+ lcd_print("and mankind its");
+ lcd_gotoxy(1,2);
+ lcd_print("citizens.");
+ _delay_ms(3500);
+ }
+
+ return 0;
+}
+\ No newline at end of file
