/**
 ******************************************************************************
 * @file           : main.c
 * @author         : Auto-generated by STM32CubeIDE
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2024 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */

#include <stdint.h>

/* Reset and Clock Control registers */
typedef struct {
    volatile uint32_t CR;
    volatile uint32_t CFGR;
    volatile uint32_t CIR;
    volatile uint32_t APB2RSTR;
    volatile uint32_t APB1RSTR;
    volatile uint32_t AHBENR;
    volatile uint32_t APB2ENR;
    volatile uint32_t APB1ENR;
    volatile uint32_t BDCR;
    volatile uint32_t CSR;
} RCC_TypeDef;

/* General Purpose I/O registers */
typedef struct {
    volatile uint32_t CRL;
    volatile uint32_t CRH;
    volatile uint32_t IDR;
    volatile uint32_t ODR;
    volatile uint32_t BSRR;
    volatile uint32_t BRR;
    volatile uint32_t LCKR;
} GPIO_TypeDef;

#define RCC_BASE    0x40021000UL // RCC base address
#define GPIOA_BASE  0x40010800UL // GPIO Port A base address
#define RCC         ((RCC_TypeDef *)RCC_BASE)
#define GPIOA       ((GPIO_TypeDef *)GPIOA_BASE)

#define BUTTON_PIN  10 // PA10
#define LED_PIN     5  // PA5

void USER_RCC_ClockEnable(void);
void USER_GPIO_Init(void);
void delay(uint32_t milliseconds);

int main(void) {
    /* Declarations and Initializations */
    USER_RCC_ClockEnable();
    USER_GPIO_Init();

    uint32_t button_pressed = 0;

    while (1) {
        // Check if the button is pressed
        if (!(GPIOA->IDR & (1 << BUTTON_PIN))) {
            // Wait for 10ms to avoid noise
            delay(10);

            // Double verification
            if (!(GPIOA->IDR & (1 << BUTTON_PIN))) {
                // Wait until the button is released
                while (!(GPIOA->IDR & (1 << BUTTON_PIN)));

                // Wait for another 10ms
                delay(10);

                if (!button_pressed) {
                    GPIOA->ODR ^= (1 << LED_PIN); // Toggle the LED
                    button_pressed = 1;
                }
            }
        } else {
            button_pressed = 0;
        }
    }
}

void USER_RCC_ClockEnable(void) {
    // RCC_APB2ENR modified to IO port A clock enable
    RCC->APB2ENR = RCC->APB2ENR | (0x1UL << 2U); // Set IOPAEN bit
}

void USER_GPIO_Init(void) {
    // GPIOx_BSRR modified to reset pin 5 of port A (LD2 is connected to PA5)
    GPIOA->BSRR = (0x1UL << 21U); // Reset pin 5

    // GPIOx_CRL modified to configure pin 5 as output
    GPIOA->CRL = (GPIOA->CRL & ~(0x3UL << 22U)) & ~(0x2UL << 20U); // Clear CNF5[1:0] and MODE5_1 bits

    // GPIOx_CRL modified to select pin 5 max speed of 10MHz
    GPIOA->CRL = GPIOA->CRL | (0x1UL << 20U); // Set MODE5_0 bit

    // GPIOx_CRH modified to configure pin 10 as input floating (push-button)
    GPIOA->CRH = (GPIOA->CRH & ~(0x3UL << 8U)) | (0x4UL << 8U); // Clear CNF10[1:0] and set MODE10_0 bit
}

void delay(uint32_t milliseconds) {
    for (volatile uint32_t i = 0; i < (milliseconds * 800); i++) {
        // Adjust this loop for your clock speed and desired delay length
    }
}