Full LCD setup with buttons A5 and A4 working!

lcd.c

@@ -1,7 +1,7 @@
 #include <avr/io.h>		//standard AVR header
-
 #define F_CPU 16000000UL	// THE CPU FREQUENCY
 #include <util/delay.h>		//delay header
+#include <avr/interrupt.h>      //interrupt header
 
 #define LCD_DPRT PORTD		//LCD DATA PORT
 #define LCD_DDDR DDRD		//LCD DATA DDR
@@ -12,32 +12,43 @@
 #define LCD_RS 0		//LCD RS
 #define LCD_EN 1		//LCD EN
 				
-void lcd_putValue(unsigned char val){
+// Define your buffer sizes
-	LCD_DPRT &= 0x0F;
+#define SERIAL_BUFFER_SIZE 20
-	LCD_DPRT |= (val&0xF0);		//send cmnd to data port
+#define NOTES_BUFFER_SIZE 20
-	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
 
+// Global variables
+char serialBuffer[SERIAL_BUFFER_SIZE];
+char notesBuffer[NOTES_BUFFER_SIZE];
+int serialIndex = 0;
+int notesIndex = 0;
+volatile int buttonState = 0; // Holds the state of all buttons
+void lcd_putValue(unsigned char val)
+{
 	LCD_DPRT &= 0x0F;
-	LCD_DPRT |= val<<4;			//send cmnd to data port
+	LCD_DPRT |= (val & 0xF0);	//send cmnd to data port
-	LCD_CPRT |= (1<<LCD_EN);		//EN = 1 for H-to-L pulse
+	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
+	LCD_CPRT &= ~(1 << LCD_EN);	//EN = 0 for H-to-L pulse
+	_delay_us(100);		//wait to make enable wide
+	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
 }
 
 //*******************************************************
-void lcdCommand( unsigned char cmnd ){	
+void lcdCommand(unsigned char cmnd)
-	LCD_CPRT &= ~ (1<<LCD_RS);		//RS = 0 for command	
+{
+	LCD_CPRT &= ~(1 << LCD_RS);	//RS = 0 for command
 	lcd_putValue(cmnd);
 }
 
 //*******************************************************
-void lcdData( unsigned char data )
+void lcdData(unsigned char data)
 {
-	LCD_CPRT |= (1<<LCD_RS);		//RS = 1 for data 	
+	LCD_CPRT |= (1 << LCD_RS);	//RS = 1 for data
 	lcd_putValue(data);
 }
 
@@ -63,65 +74,137 @@ void lcd_hideCursor()
 void lcd_init()
 {
 	LCD_DDDR |= 0xF0;
-	LCD_CDDR |= (1<<LCD_RS)|(1<<LCD_EN);
+	LCD_CDDR |= (1 << LCD_RS) | (1 << LCD_EN);
- 
+	LCD_CPRT &= ~(1 << LCD_EN);	//LCD_EN = 0
-	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  
+	unsigned char firstCharAdr[] = { 0x80, 0xC0, 0x94, 0xD4 };	//Table 12-4
-	lcdCommand(firstCharAdr[y-1] + x - 1);
+	lcdCommand(firstCharAdr[y - 1] + x - 1);
 	_delay_us(100);
 }
 
 //*******************************************************
-void lcd_print( char * str )
+void lcd_print(char *str)
 {
 	unsigned char i = 0;
-
+	while (str[i] != 0)	//while it is not end of string
-	while(str[i] != 0) //while it is not end of string
 	{
 		lcdData(str[i]);
-		i++ ;
+		i++;
+	}
+}
+
+char getSerialData() {
+    // Read serial data and return it
+    return ' ';
+}
+
+char getNote() {
+    // Read notes data and return it
+    return ' ';
+}
+
+void setup() {
+    // Initialize Serial communication
+    // Initialize LCD
+    // Initialize buttons as inputs
+    // Set pins A4 and A5 as inputs with pull-up resistors enabled
+    DDRC &= ~((1 << DDC4) | (1 << DDC5));
+    PORTC |= (1 << PORTC4) | (1 << PORTC5);
+
+    // Enable Pin Change Interrupt on pins PC4 and PC5
+    PCMSK1 |= (1 << PCINT12) | (1 << PCINT13); // Enable PCINT for pins PC4 and PC5
+    PCICR |= (1 << PCIE1); // Enable Pin Change Interrupt 1
+    sei(); // Enable global interrupts
+}
+
+ISR(PCINT1_vect) {
+    // Update button state when any pin changes state
+    for (unsigned char i = 0; i <= 5; i++) {
+	    if (PINC & (1 << i)) {
+		    buttonState = i;
+		    break;
+	    }
+    }
+}
+
+void displaySerialData() {
+    lcd_clear();
+    lcd_gotoxy(1, 1);
+    while (!(buttonState == 5)) {
+        char newData = getSerialData();
+        if (newData != '\0') {
+            // Add new data to the left side of line 1 of the LCD
+            // Push existing data to the right
+            // Display on LCD
+        }
+        _delay_ms(100); // Adjust delay as needed
+    }
+}
+
+void displayNotes() {
+    lcd_clear();
+    lcd_gotoxy(1, 1);
+    while (buttonState == 4) {
+        char newNote = getNote();
+        if (newNote != '\0') {
+            // Add new note to the right side of line 1 of the LCD
+            // Push existing notes to the left
+            // Display on LCD
+        }
+        _delay_ms(1000); // Adjust delay as needed
     }
 }
 
 //*******************************************************
-int main(void) 
+int main(void) {
-{	
+	lcd_init();
 	lcd_init();
 	lcd_hideCursor();
 
-	while(1)
+	setup();
-	{	
+	lcd_clear();
+    	while (1) {
+		// Check button state and perform actions accordingly
+        	if (buttonState == 5) {
 			lcd_clear();
             		lcd_gotoxy(1,1);
-		lcd_print("The world is but");
+			lcd_print("Button A5 Works");
+			_delay_ms(100);
+			//displaySerialData();
+       		} else if (buttonState == 4) {
+			lcd_clear();
             		lcd_gotoxy(1,2);
+			lcd_print("Button A4 Works");
+			_delay_ms(100);
+			//displayNotes();
+        	}
+	}
+    	return 0;
+	/*while (1) {
+		lcd_clear();
+		lcd_gotoxy(1, 1);
+		lcd_print("Note 1:");
+		lcd_gotoxy(1, 2);
 		lcd_print("one country");
-
 		lcd_showCursor();
 		_delay_ms(2500);
-	
 		lcd_clear();
-	
+		lcd_gotoxy(1, 1);
-		lcd_gotoxy(1,1);
 		lcd_print("and mankind its");
-		lcd_gotoxy(1,2);
+		lcd_gotoxy(1, 2);
 		lcd_print("citizens.");
 		_delay_ms(3500);
 	}
-
+	return 0;*/
-	return 0;
 }