/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file    PWR/PWR_SecurityIllegalAccess_DualCore/CM4/Src/main.c
  * @author  MCD Application Team
  * @brief   Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2020 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 */

/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define LED_TOGGLE_FREQ_FAST            ( 10 * 2) /* LED toggle frequency fast (10Hz). Note: Factor 2 to convert toggle frequency to signal frequency. */
#define LED_TOGGLE_FREQ_SLOW            (  1 * 2) /* LED toggle frequency slow ( 1Hz). Note: Factor 2 to convert toggle frequency to signal frequency. */

/* USER CODE END PD */

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

/* USER CODE END PM */

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

/* USER CODE BEGIN PV */
uint32_t button_event = 0;
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void LED_toggle(uint32_t toggle_frequency, uint32_t toggle_duration_ms);
/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */

/* 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 */
  /* USER CODE BEGIN 2 */
  /* Configure LEDs */
  BSP_LED_Init(LED1);
  BSP_LED_Init(LED3);
  
  /* Configure User push-button (B1) */
  BSP_PB_Init(BUTTON_SW1, BUTTON_MODE_EXTI);
  
  /* Check whether system is secured */
  if(READ_BIT(FLASH->OPTR, FLASH_OPTR_ESE) != FLASH_OPTR_ESE)
  {
    /* Case of system not secured (initial state):
       Intermediate phase, prepare system for example setup
       - Boot CPU2 for program download
       - Go to error handler to not continue this example in current configuration
       - Next step: download program of CPU2
   */
    
    /* Boot CPU2 */
    HAL_PWREx_ReleaseCore(PWR_CORE_CPU2);
    
    /* Go to error handler */
    Error_Handler();
  }
  else
  {
    /* Case of system secured: CPU2 boot will be performed at
       first illegal access occurrence, by GTZC peripheral. */
    
    /* Toggle LED during 2s */
    LED_toggle(LED_TOGGLE_FREQ_FAST, 2);
  }
  
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    if(button_event != 0UL)
    {
      /* Generate an illegal access: attempt to write GTZC register from CPU1 */
      /* Note: Write done using CMSIS definition because HAL API 
               ("HAL_GTZC_TZIC_DisableIT()") prevents this access from CPU1. */
      GTZC_TZIC->IER1 = 0;
      
      /* Turn LED on during 2 sec */
      BSP_LED_On(LED1);
      HAL_Delay(2000);
      
      button_event = 0;
    }
    
    /* Toggle LED */
    BSP_LED_Toggle(LED1);
    HAL_Delay(1000 / LED_TOGGLE_FREQ_SLOW); /* Toggle delay (value 1000 for conversion from Hz to ms) */
    
    /* 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};

  /** Configure the main internal regulator output voltage
  */
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);

  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
  RCC_OscInitStruct.PLL.PLLN = 6;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure the SYSCLKSource, HCLK, PCLK1 and PCLK2 clocks dividers
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK3|RCC_CLOCKTYPE_HCLK2
                              |RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK2Divider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */

/**
  * @brief  Toggle LED at specified frequency during specified duration
  * @param  toggle_frequency_hz LED toggle frequency (unit: Hz)
  * @param  toggle_duration_s LED toggle duration  (unit: s)
  * @retval None
  */
void LED_toggle(uint32_t toggle_frequency_hz, uint32_t toggle_duration_s)
{
  uint32_t period_ms = (1000 / toggle_frequency_hz); /* Conversion from Hz to ms */
  uint32_t wait_index = (toggle_frequency_hz * toggle_duration_s);
  
  while(wait_index-- != 0)
  {
    /* Toggle LED */
    BSP_LED_Toggle(LED1);
    HAL_Delay(period_ms);
  }
}

/**
  * @brief EXTI line detection callbacks
  * @param GPIO_Pin Specifies the pins connected EXTI line
  * @retval None
  */
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin)
{
  if (GPIO_Pin == BUTTON_SW1_PIN)
  {
    button_event = 1;
  }
}

/* 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 */
  
  /* Turn on LED */
  BSP_LED_On(LED3);
  
  /* User can add his own implementation to report the HAL error return state */
  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) */
  /* Infinite loop */
  while (1)
  {
  }

  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
