/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2021 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.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <string.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define FLASH_STORAGE_M 0x08005000
#define FLASH_STORAGE_Q 0x08005500
#define page_size 0x800
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
void save_to_flash(uint8_t *data, uint32_t address)
{
	volatile uint32_t data_to_FLASH[(strlen((char*)data)/4)	+ (int)((strlen((char*)data) % 4) != 0)];
	memset((uint8_t*)data_to_FLASH, 0, strlen((char*)data_to_FLASH));
	strcpy((char*)data_to_FLASH, (char*)data);

	volatile uint32_t data_length = (strlen((char*)data_to_FLASH) / 4)
									+ (int)((strlen((char*)data_to_FLASH) % 4) != 0);
	volatile uint16_t pages = (strlen((char*)data)/page_size)
									+ (int)((strlen((char*)data)%page_size) != 0);
	  /* Unlock the Flash to enable the flash control register access *************/
	  HAL_FLASH_Unlock();

	  /* Allow Access to option bytes sector */
	  HAL_FLASH_OB_Unlock();

	  /* Fill EraseInit structure*/
	  FLASH_EraseInitTypeDef EraseInitStruct;
	  EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;
	  EraseInitStruct.PageAddress = address;
	  EraseInitStruct.NbPages = pages;
	  uint32_t PageError;

	  volatile uint32_t write_cnt=0, index=0;

	  volatile HAL_StatusTypeDef status;
	  status = HAL_FLASHEx_Erase(&EraseInitStruct, &PageError);
	  while(index < data_length)
	  {
		  if (status == HAL_OK)
		  {
			  status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_WORD, address+write_cnt, data_to_FLASH[index]);
			  if(status == HAL_OK)
			  {
				  write_cnt += 4;
				  index++;
			  }
		  }
	  }

	  HAL_FLASH_OB_Lock();
	  HAL_FLASH_Lock();
}

void read_flash(uint8_t* data,uint32_t address)
{
	volatile uint32_t read_data;
	volatile uint32_t read_cnt=0;
	do
	{
		read_data = *(uint32_t*)(address + read_cnt);
		if(read_data != 0xFFFFFFFF)
		{
			data[read_cnt] = (uint8_t)read_data;
			data[read_cnt + 1] = (uint8_t)(read_data >> 8);
			data[read_cnt + 2] = (uint8_t)(read_data >> 16);
			data[read_cnt + 3] = (uint8_t)(read_data >> 24);
			read_cnt += 4;
		}
	}while(read_data != 0xFFFFFFFF);
}
/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  /* USER CODE BEGIN 2 */

  /* USER CODE BEGIN 2 */
  char write_data[50];
  memset(write_data, 0, sizeof(write_data));
  printf("going to write to flash");
  strcpy(write_data, "Hello World!!!");

  //save_to_flash((uint8_t*)write_data,FLASH_STORAGE_M);

  char read1_data[50];
  memset(read1_data, 0, sizeof(read1_data));

  read_flash((uint8_t*)read1_data,FLASH_STORAGE_M);

  int write_number = 23;
  int *pointer_write = &write_number;
  //save_to_flash((uint8_t*)pointer_write,FLASH_STORAGE_Q);

  int read2_number = 0;
  int *pointer_read = &read2_number;
  read_flash((uint8_t*)pointer_read,FLASH_STORAGE_Q);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13, GPIO_PIN_RESET);

  /*Configure GPIO pin : PC13 */
  GPIO_InitStruct.Pin = GPIO_PIN_13;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#ifdef  USE_FULL_ASSERT
/**
  * @brief  Reports the name of the source file and the source line number
  *         where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t *file, uint32_t line)
{
  /* USER CODE BEGIN 6 */
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */