text: /* USER CODE BEGIN Header */
  /**
   ******************************************************************************
   * @file           : main.c
   * @brief          : Main program body
   ******************************************************************************
   * @attention
   *
   * <h2><center>&copy; Copyright (c) 2020 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 "spi.h"
  #include "usart.h"
  #include "gpio.h"
  
  /* Private includes ----------------------------------------------------------*/
  /* USER CODE BEGIN Includes */
  
  #include <stdio.h>
  #include "SX1278.h"
  
  /* USER CODE END Includes */
  
  /* Private typedef -----------------------------------------------------------*/
  /* USER CODE BEGIN PTD */
  
  /* USER CODE END PTD */
  
  /* Private define ------------------------------------------------------------*/
  /* USER CODE BEGIN PD */
  /* USER CODE END PD */
  
  /* Private macro -------------------------------------------------------------*/
  /* USER CODE BEGIN PM */
  
  /* USER CODE END PM */
  
  /* Private variables ---------------------------------------------------------*/
  
  /* USER CODE BEGIN PV */
  /* Private variables ---------------------------------------------------------*/
  
  /* USER CODE END PV */
  
  /* Private function prototypes -----------------------------------------------*/
  void SystemClock_Config(void);
  /* USER CODE BEGIN PFP */
  /* Private function prototypes -----------------------------------------------*/
  
  int _write(int file, char *ptr, int len) {
  	int i;
  	HAL_UART_Transmit(&huart2, (uint8_t*) ptr, len, 50);
  	for (i = 0; i < len; i++) {
  		ITM_SendChar(*ptr++);
  	}
  	return len;
  }
  
  /* USER CODE END PFP */
  
  /* Private user code ---------------------------------------------------------*/
  /* USER CODE BEGIN 0 */
  
  SX1278_hw_t SX1278_hw;
  SX1278_t SX1278;
  
  int master;
  int ret;
  
  char buffer[512];
  
  int message;
  int message_length;
  
  /* 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_SPI2_Init();
  	MX_USART2_UART_Init();
  	/* USER CODE BEGIN 2 */
  	master = HAL_GPIO_ReadPin(MODE_GPIO_Port, MODE_Pin);
  	if (master == 1) {
  		printf("Mode: Master\r\n");
  		HAL_GPIO_WritePin(MODE_GPIO_Port, MODE_Pin, GPIO_PIN_RESET);
  	} else {
  		printf("Mode: Slave\r\n");
  		HAL_GPIO_WritePin(MODE_GPIO_Port, MODE_Pin, GPIO_PIN_SET);
  	}
  
  	//initialize LoRa module
  	SX1278_hw.dio0.port = DIO0_GPIO_Port;
  	SX1278_hw.dio0.pin = DIO0_Pin;
  	SX1278_hw.nss.port = NSS_GPIO_Port;
  	SX1278_hw.nss.pin = NSS_Pin;
  	SX1278_hw.reset.port = RESET_GPIO_Port;
  	SX1278_hw.reset.pin = RESET_Pin;
  	SX1278_hw.spi = &hspi2;
  
  	SX1278.hw = &SX1278_hw;
  
  	printf("Configuring LoRa module\r\n");
  	SX1278_init(&SX1278, 434000000, SX1278_POWER_17DBM, SX1278_LORA_SF_7,
  	SX1278_LORA_BW_125KHZ, SX1278_LORA_CR_4_5, SX1278_LORA_CRC_EN, 10);
  	printf("Done configuring LoRaModule\r\n");
  
  	if (master == 1) {
  		ret = SX1278_LoRaEntryTx(&SX1278, 16, 2000);
  		HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
  	} else {
  		ret = SX1278_LoRaEntryRx(&SX1278, 16, 2000);
  		HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
  	}
  
  	/* USER CODE END 2 */
  
  	/* Infinite loop */
  	/* USER CODE BEGIN WHILE */
  	while (1) {
  		if (master == 1) {
  			printf("Master ...\r\n");
  			HAL_Delay(1000);
  			printf("Sending package...\r\n");
  
  			message_length = sprintf(buffer, "Hello %d", message);
  			ret = SX1278_LoRaEntryTx(&SX1278, message_length, 2000);
  			printf("Entry: %d\r\n", ret);
  
  			printf("Sending %s\r\n", buffer);
  			ret = SX1278_LoRaTxPacket(&SX1278, (uint8_t*) buffer,
  					message_length, 2000);
  			message += 1;
  
  			printf("Transmission: %d\r\n", ret);
  			printf("Package sent...\r\n");
  
  		} else {
  			printf("Slave ...\r\n");
  			HAL_Delay(800);
  			printf("Receiving package...\r\n");
  
  			ret = SX1278_LoRaRxPacket(&SX1278);
  			printf("Received: %d\r\n", ret);
  			if (ret > 0) {
  				SX1278_read(&SX1278, (uint8_t*) buffer, ret);
  				printf("Content (%d): %s\r\n", ret, buffer);
  			}
  			printf("Package received ...\r\n");
  
  		}
  
  		//change mode
  		if (GPIO_PIN_RESET == HAL_GPIO_ReadPin(MODE_GPIO_Port, MODE_Pin)) {
  			printf("Changing mode\r\n");
  			master = ~master & 0x01;
  			if (master == 1) {
  				ret = SX1278_LoRaEntryTx(&SX1278, 16, 2000);
  				HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_SET);
  			} else {
  				ret = SX1278_LoRaEntryRx(&SX1278, 16, 2000);
  				HAL_GPIO_WritePin(LED_GPIO_Port, LED_Pin, GPIO_PIN_RESET);
  			}
  			HAL_Delay(1000);
  			while (GPIO_PIN_RESET == HAL_GPIO_ReadPin(MODE_GPIO_Port, MODE_Pin))
  				;
  		}
  		/* 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 };
  	RCC_PeriphCLKInitTypeDef PeriphClkInit = { 0 };
  
  	/** Initializes the RCC Oscillators according to the specified parameters
  	 * in the RCC_OscInitTypeDef structure.
  	 */
  	RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
  	RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  	RCC_OscInitStruct.MSICalibrationValue = 0;
  	RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
  	RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  	RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  	RCC_OscInitStruct.PLL.PLLM = 1;
  	RCC_OscInitStruct.PLL.PLLN = 40;
  	RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  	RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  	RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  	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_4) != HAL_OK) {
  		Error_Handler();
  	}
  	PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
  	PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
  	if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK) {
  		Error_Handler();
  	}
  	/** Configure the main internal regulator output voltage
  	 */
  	if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1)
  			!= HAL_OK) {
  		Error_Handler();
  	}
  }
  
  /* 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 */
  	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****/
  