Made button A5 work and shifting random characters

lcd.c

@@ -2,6 +2,7 @@
 #define F_CPU 16000000UL	// THE CPU FREQUENCY
 #include <util/delay.h>		//delay header
 #include <avr/interrupt.h>      //interrupt header
+#include <stdlib.h> 
 
 #define LCD_DPRT PORTD		//LCD DATA PORT
 #define LCD_DDDR DDRD		//LCD DATA DDR
@@ -139,19 +140,41 @@ ISR(PCINT1_vect) {
 }
 
 void displaySerialData() {
+    char circularBuffer[16];
+    static int bufferIndex = 0;
+
     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
+    lcd_print("KindaGood");
+    while ((PINC & _BV(5)) == 0) {
+        char randomValue = '0' + (rand() % 10);
+
+        if (bufferIndex == 16) {
+            // Remove the first value and shift other values down
+            for (int i = 0; i < 16 - 1; i++) {
+                circularBuffer[i] = circularBuffer[i + 1];
+            }
+            // Add the new value at the end
+            circularBuffer[16 - 1] = randomValue;
+        } else {
+            // Add the new value to the buffer
+            circularBuffer[bufferIndex++] = randomValue;
         }
-        _delay_ms(100); // Adjust delay as needed
+
+        lcd_clear();
+        lcd_gotoxy(1, 1);
+        for (int i = 0; i < 16; i++) {
+            char singleChar[2] = {circularBuffer[i], '\0'};
+	    lcd_print(singleChar); // Print the single character
+        }
+
+        _delay_ms(1000);
     }
+    lcd_clear();
 }
 
+
+
 void displayNotes() {
     lcd_clear();
     lcd_gotoxy(1, 1);
@@ -177,16 +200,17 @@ int main(void) {
     	while (1) {
 		// Check button state and perform actions accordingly
         	if (buttonState == 5) {
-			lcd_clear();
-            		lcd_gotoxy(1,1);
-			lcd_print("Button A5 Works");
-			_delay_ms(100);
-			//displaySerialData();
+			lcd_gotoxy(1,1);
+			lcd_print("good");
+			displaySerialData();
+			buttonState = 0;
+
        		} else if (buttonState == 4) {
 			lcd_clear();
             		lcd_gotoxy(1,2);
 			lcd_print("Button A4 Works");
 			_delay_ms(100);
+			buttonState = 0;
 			//displayNotes();
         	}
 	}