import lcd.c from lab 10

1 files changed, 109 insertions, 71 deletions

diff --git a/lcd.c b/lcd.c
index 6d9bd4a..5b8866a 100644
--- 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