#include <stdlib.h>
#include <string.h>
#include "lcd.h"
#include "keypad.h"
#include "calculation.h"

// Declare external variables for keypad row and column pins
extern volatile char *rows_pinC;
extern volatile char *colum_pinA;

// Renamed function for better readability
void user_delay() {
    volatile long i;
    for (i = 0; i < 50000; i++);
}

// Initialize the system: keypad and LCD setup
void setup() {
    init_keypad_pin(); // Initialize keypad pins
    init_LCD_pin();    // Initialize LCD pins
    init_lcd();        // Initialize LCD display
    
    // Main loop for continuously checking the keypad
    while (1) {
        *rows_pinC = 0x0F;    // Set all rows high
        *colum_pinA = 0x00;   // Set all columns low
        
        while (*colum_pinA == 0); // Wait until a key is pressed
        
        // Scan for the pressed key from the keypad
        char key = keypad_scan();
        
        // If 'C' is pressed, clear the display
        if (key == 'C') {
            clear_display();
        } else {
            // Process the input key and handle calculations
            process_key_input(key);
        }
        
        user_delay();  // Delay to debounce the key press
    }
}

// Empty loop function since we are using an infinite loop in setup
void loop() {}