#include <stdint.h>
#include <stdio.h>

// Define register addresses for control and data ports
#define LCD_RS  (*((volatile uint8_t *)0x40000007)) // Pin 7
#define LCD_EN  (*((volatile uint8_t *)0x40000006)) // Pin 6
#define LCD_D4  (*((volatile uint8_t *)0x4000000C)) // Pin 12
#define LCD_D5  (*((volatile uint8_t *)0x4000000A)) // Pin 10
#define LCD_D6  (*((volatile uint8_t *)0x40000009)) // Pin 9
#define LCD_D7  (*((volatile uint8_t *)0x40000008)) // Pin 8

// Function to send data to LCD
void lcd_send_data(uint8_t data) {
    LCD_RS = 1;         // RS high for data
    LCD_EN = 1;         // Enable high
    LCD_D4 = (data >> 4) & 0x01;   // Send higher nibble
    LCD_D5 = (data >> 5) & 0x01;
    LCD_D6 = (data >> 6) & 0x01;
    LCD_D7 = (data >> 7) & 0x01;
    LCD_EN = 0;         // Enable low
    LCD_EN = 1;         // Enable high
    LCD_D4 = (data >> 0) & 0x01;   // Send lower nibble
    LCD_D5 = (data >> 1) & 0x01;
    LCD_D6 = (data >> 2) & 0x01;
    LCD_D7 = (data >> 3) & 0x01;
    LCD_EN = 0;         // Enable low
}

// Function to send command to LCD
void lcd_send_command(uint8_t command) {
    LCD_RS = 0;         // RS low for command
    LCD_EN = 1;         // Enable high
    LCD_D4 = (command >> 4) & 0x01; // Send higher nibble
    LCD_D5 = (command >> 5) & 0x01;
    LCD_D6 = (command >> 6) & 0x01;
    LCD_D7 = (command >> 7) & 0x01;
    LCD_EN = 0;         // Enable low
    LCD_EN = 1;         // Enable high
    LCD_D4 = (command >> 0) & 0x01; // Send lower nibble
    LCD_D5 = (command >> 1) & 0x01;
    LCD_D6 = (command >> 2) & 0x01;
    LCD_D7 = (command >> 3) & 0x01;
    LCD_EN = 0;         // Enable low
}

// Function to initialize LCD
void lcd_init() {
    // Initialization sequence as per datasheet
    lcd_send_command(0x33); // Initialize
    lcd_send_command(0x32); // Set to 4-bit mode
    lcd_send_command(0x28); // 2 line, 5x8 matrix
    lcd_send_command(0x0C); // Display on, cursor off, blink off
    lcd_send_command(0x01); // Clear display
    lcd_send_command(0x06); // Increment cursor
}

// Function to print string on LCD
void lcd_print_string(char *str) {
    while (*str) {
        lcd_send_data(*str++);
    }
}

// Function to print float on LCD
void lcd_print_float(float f) {
    char buffer[16];
    sprintf(buffer, "%.2f", f); // Format float with 2 decimal places
    lcd_print_string(buffer);
}

int main() {
    // Initialize LCD
    lcd_init();

    // Print "Temperature" at first line
    lcd_send_command(0x80); // Set cursor to beginning of first line
    lcd_print_string("Temperature");

    // Print temperature value
    lcd_send_command(0xC0); // Set cursor to beginning of second line
    lcd_print_float(34);    // Assuming initial temperature is 34

    while (1) {
        // Your loop code here
    }

    return 0;
}