/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @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.
  *
  ******************************************************************************
  */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "crc.h"
#include "app_lorawan.h"
#include "usart.h"
#include "gpio.h"

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

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
#define TIMEOUT 1000
//UART_HandleTypeDef huart2;
/* 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);
/* USER CODE BEGIN PFP */
uint32_t CRC_HardwareBlock(uint16_t Size, const uint8_t *Buffer);
uint8_t CheckCRC(uint16_t Size, const uint8_t *Buffer);
/* 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 */
  MX_GPIO_Init();
  MX_CRC_Init();
  MX_USART2_UART_Init();
  MX_LoRaWAN_Init();
  /* USER CODE BEGIN 2 */
  int response;
  uint16_t payload[2];
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	  response=GetCTCoilReading(payload);
	  APP_LOG(TS_ON, VLEVEL_M, "CT Read %d\r\n", response);
    /* USER CODE END WHILE */
    MX_LoRaWAN_Process();

    /* 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 LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);

  /** 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_LSE|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_10;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  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_HCLK
                              |RCC_CLOCKTYPE_SYSCLK|RCC_CLOCKTYPE_PCLK1
                              |RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.AHBCLK3Divider = RCC_SYSCLK_DIV1;

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

/* USER CODE BEGIN 4 */
uint32_t CRC_HardwareBlock(uint16_t Size, const uint8_t *Buffer)
{
	CRC->INIT = 0xFFFF;
	CRC->POL = 0x8005;
	CRC->CR = 0xE9;

	while(Size >= 4) // Do as much as we can at 32-bits
	{
		CRC->DR = *((uint32_t *)Buffer);

		Buffer += 4;
		Size -= 4;
	}

	while(Size >= 2) // Perhaps one of these
	{
		*((uint16_t *)&CRC->DR) = *((uint16_t *)Buffer);

		Buffer += 2;
		Size -= 2;
	}

	while(Size--) // Perhaps one of these
		*((uint8_t *)&CRC->DR) = *Buffer++;

	return(CRC->DR); // Return final CRC computation
}

uint8_t CheckCRC(uint16_t Size, const uint8_t *Buffer)
{
	uint32_t recieved_crc=(Buffer[Size+1]<<8|Buffer[Size]);
	uint32_t calculated_crc=CRC_HardwareBlock(Size, Buffer);
	if(recieved_crc == calculated_crc){
		return 0;
	}
	return 1;
}

int GetCTCoilReading(uint16_t *payload){
	uint8_t cmd1[]={0x00, 0x03, 0x00, 0x00, 0x00, 0x06, 0xC4, 0x19};
//	uint8_t cmd1[]="HelloWorldTesting\r\n";
	uint8_t cmd2[]={0x00, 0x03, 0x01, 0x00, 0x00, 0x01, 0x84, 0x27};
	uint8_t cmd3[]={0x00, 0x03, 0x01, 0x10, 0x00, 0x02, 0xC5, 0xE3};
	uint8_t rx_buff1[17];
	uint8_t rx_buff2[7];
	uint8_t rx_buff3[9];

	HAL_UART_Transmit(&huart2, cmd1, sizeof(cmd1), TIMEOUT);
	APP_LOG(TS_ON, VLEVEL_M, "In CT Read func\r\n");
	if(HAL_UART_Receive(&huart2, rx_buff1, 17, TIMEOUT)==HAL_OK) //if transfer is successful
	{
		if(CheckCRC(sizeof(rx_buff1)-2, rx_buff1)){
			return CRC_ERROR;
		}
		payload[0]=(rx_buff1[3]<<8|rx_buff1[4]);
		payload[1]=(rx_buff1[5]<<8|rx_buff1[6]);
	} else {
		return READ_TIMEOUT;
	}
	HAL_UART_Transmit(&huart2, cmd2, sizeof(cmd2), TIMEOUT);
	if(HAL_UART_Receive(&huart2, rx_buff2, 7, TIMEOUT)==HAL_OK) //if transfer is successful
	{
		if(CheckCRC(sizeof(rx_buff2)-2, rx_buff2)){
			return CRC_ERROR;
		}
	} else {
		return READ_TIMEOUT;
	}
	HAL_UART_Transmit(&huart2, cmd3, sizeof(cmd3), TIMEOUT);
	if(HAL_UART_Receive(&huart2, rx_buff3, 9, TIMEOUT)==HAL_OK) //if transfer is successful
	{
		if(CheckCRC(sizeof(rx_buff3)-2, rx_buff3)){
			return CRC_ERROR;
		}
	} else {
		return READ_TIMEOUT;
	}
	return READ_SUCCESS;
}

/* 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 */