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
@@ -12,14 +12,24 @@
 #define LCD_RS 0		//LCD RS
 #define LCD_EN 1		//LCD EN
 				
-void lcd_putValue(unsigned char val){
+// Define your buffer sizes
+#define SERIAL_BUFFER_SIZE 20
+#define NOTES_BUFFER_SIZE 20
+
+// 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 & 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
-
 	LCD_DPRT &= 0x0F;
 	LCD_DPRT |= val << 4;	//send cmnd to data port
 	LCD_CPRT |= (1 << LCD_EN);	//EN = 1 for H-to-L pulse
@@ -29,7 +39,8 @@ void lcd_putValue(unsigned char val){
 }
 
 //*******************************************************
-void lcdCommand( unsigned char cmnd ){	
+void lcdCommand(unsigned char cmnd)
+{
 	LCD_CPRT &= ~(1 << LCD_RS);	//RS = 0 for command
 	lcd_putValue(cmnd);
 }
@@ -64,16 +75,13 @@ 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();
 }
 
@@ -89,7 +97,6 @@ void lcd_gotoxy(unsigned char x, unsigned char y)
 void lcd_print(char *str)
 {
 	unsigned char i = 0;
-
 	while (str[i] != 0)	//while it is not end of string
 	{
 		lcdData(str[i]);
@@ -97,31 +104,107 @@ void lcd_print( char * str )
 	}
 }
 
+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_print("and mankind its");
 		lcd_gotoxy(1, 2);
 		lcd_print("citizens.");
 		_delay_ms(3500);
 	}
-
-	return 0;
+	return 0;*/
 }