/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * <h2><center>&copy; Copyright (c) 2021 STMicroelectronics.
  * All rights reserved.</center></h2>
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                        opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "usb_device.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "stdio.h"
#include "usbd_cdc_if.h"
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define DFU_BOOT_FLAG 0xDEADBEEF
/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
I2C_HandleTypeDef hi2c1;

/* USER CODE BEGIN PV */

extern int _estack;
uint32_t *dfu_boot_flag;
uint32_t push_count = 0;

uint8_t ram[256] = {0};
uint8_t offset = 0;
uint8_t first = 0;

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_I2C1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

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

// Redirect printf to USB serial
int _write(int file, char *ptr, int len) {
    uint8_t result = CDC_Transmit_FS((uint8_t*) ptr, len);
    if (result != HAL_OK) {
            return 0;
    }
    return len;
}

void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin) {
	if (GPIO_Pin == BTN_Pin) // If the button
	{
		GPIO_PinState pinState = HAL_GPIO_ReadPin(BTN_GPIO_Port, BTN_Pin);
		if (pinState == GPIO_PIN_RESET) {
			push_count = HAL_GetTick();
		} else {
			if (HAL_GetTick() - push_count > 1000) {
				// Set the boot flag and reset the mcu.  The bootloader
				// will detect the flag and stay in dfu mode.
				*dfu_boot_flag = DFU_BOOT_FLAG;
				HAL_NVIC_SystemReset();
			}

			//scan_trigger = true;

			push_count = 0;
		}

	}
}

void HAL_I2C_SlaveTxCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("STX");
	offset++;
	HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[offset], 1, I2C_NEXT_FRAME);
};

void HAL_I2C_SlaveRxCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("SRX");
	if(first) {
		DBG("RXCB: offset <== %3d", offset );
		first = 0;
	} else {
		DBG("RXCB: ram[%3d] <== %3d", offset,  ram[offset] );
		offset++;
	}
	HAL_I2C_Slave_Seq_Receive_IT(hi2c, &ram[offset], 1, I2C_NEXT_FRAME);
};

void HAL_I2C_AddrCallback(I2C_HandleTypeDef *hi2c, uint8_t TransferDirection, uint16_t AddrMatchCode) {
	DBG("AD");
	if( TransferDirection==I2C_DIRECTION_TRANSMIT ) {
		if( first ) {
			HAL_I2C_Slave_Seq_Receive_IT(hi2c, &offset, 1, I2C_NEXT_FRAME);
		} else {
			HAL_I2C_Slave_Seq_Receive_IT(hi2c, &ram[offset], 1, I2C_NEXT_FRAME);
		}
	} else {
		HAL_I2C_Slave_Seq_Transmit_IT(hi2c, &ram[offset], 1, I2C_NEXT_FRAME);
	}
};

void HAL_I2C_ListenCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("L");
	first = 1;
	HAL_I2C_EnableListen_IT(hi2c); // slave is ready again
};

void HAL_I2C_MemTxCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("MTX");
};

void HAL_I2C_MemRxCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("MRX");
};

void HAL_I2C_ErrorCallback(I2C_HandleTypeDef *hi2c) {
	DBG("E");
	if( HAL_I2C_GetError(hi2c)==HAL_I2C_ERROR_AF ) {
		// transaction terminated by master
		DBG("ECB end" );
		offset--;
	} else {
		DBG("ECB err=0x%02X", HAL_I2C_GetError(hi2c) );
	}
};

void HAL_I2C_AbortCpltCallback(I2C_HandleTypeDef *hi2c) {
	DBG("AB");
};


/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */
	dfu_boot_flag = (uint32_t *)(&_estack - 100); // 100 bytes below top of stack
  /* 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();
  MX_I2C1_Init();
  MX_USB_DEVICE_Init();
  /* USER CODE BEGIN 2 */

  HAL_I2C_EnableListen_IT(&hi2c1);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */

  uint32_t now = 0, last_tick = 0, last_blink  = 0;

  while (1)
  {

	  now = HAL_GetTick();

	  if (now - last_blink >= 500) {
		  HAL_GPIO_TogglePin(LED_GPIO_Port, LED_Pin);

		  last_blink = now;
	  }

	  if (now - last_tick >= 1000) {
		  DBG("Slave tick %lu", now / 1000);

		  last_tick = now;
	  }

    /* 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_RCC_PWR_CLK_ENABLE();
  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 25;
  RCC_OscInitStruct.PLL.PLLN = 192;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 4;
  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_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief I2C1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_I2C1_Init(void)
{

  /* USER CODE BEGIN I2C1_Init 0 */

  /* USER CODE END I2C1_Init 0 */

  /* USER CODE BEGIN I2C1_Init 1 */

  /* USER CODE END I2C1_Init 1 */
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 400000;
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 64;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN I2C1_Init 2 */

  /* USER CODE END I2C1_Init 2 */

}

/**
  * @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_GPIOH_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);

  /*Configure GPIO pin : LED_Pin */
  GPIO_InitStruct.Pin = LED_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(LED_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pin : BTN_Pin */
  GPIO_InitStruct.Pin = BTN_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_FALLING;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  HAL_GPIO_Init(BTN_GPIO_Port, &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 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
