[LoRa]1- 모듈, SPI인터페이스

이번 대회의 로라 목표

- LoRa 통신 이용 및 통신 지연 시간 줄이기

 

 

0) 로라를 사용할 장소의 특성

https://www.makethefuture.shell/en-gb

우리 대회는 7월 4~9일, 인도네시아 Lombok에서 열린다.

보통 7월 인도네시아의 날씨는 최저 24°C, 최고  33°C라고 한다.

습도는 

 

 

1) 로라 모듈 특성

 

- 작동 온도는 -30~85°C인데, 밀폐된 차에 오래 있지만 않는다면,

즉 공기 순환이 어느정도 있다면 동작 가능할 것이다.

- 주파수 범위는 410~525MHz인데, 433MHz를 사용할 것이다.

주파수가 높아지면 통신 속도는 높아지지만, 회절이 덜 일어나 통신 가능 거리가 줄어든다.

- SPI Interface를 이용한다.

- 안테나 방식은 IPEX이다. 우리가 구매한 안테나는 SMA인데, 

어댑터를 사용하면 될 듯 하다.

https://www.amazon.com/Antenna-Half-Wave-Magnetic-Wireless-Repeater/dp/B07CBR485W/ref=sr_1_4?crid=2IZ5TXYSX638Y&keywords=433mhz+antenna+lora+10dbi&qid=1672151076&sprefix=433mhz+antenna+lora+10dbi%2Caps%2C286&sr=8-4

 

 

2) SPI Interface 

 

 

추후 보강 예정

 

 

---

3) STM32로 실습 - tx

 

핀 설정

SPI2 관련 핀
PB10	SPI2_SCK		clock 신호선		기본으로 설정되어 있음
PC1	SPI2_MOSI		master out, slave in 신호선
PC2	SPI2_MISO		master in, slave out 신호선
GPIO 핀 (따로 설정해야 함)
PA8	DIO0				GPIO input
PC7	RESET				GPIO output
PB5	NSS		슬레이브 선택 신호선		GPIO output
전원
STM보드의 3.3V, GND에 연결

SPI통신을 위한 설정

위 설정은 Tx, Rx 동일하게 해야 함

 

 

LoRa.zip

0.00MB

헤더파일이다. 추가 방법은

 

 

라이브러리 추가

 

 

 

 

 

핀 설정 시 참고자료

/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  * @attention
  *
  * Copyright (c) 2023 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 "rtc.h"
#include "spi.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include "LoRa.h"
//#include "liquidcrystal_i2c.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 */
volatile int gTimerCnt=0, B1_count=0, _B1_count;
volatile int _sec=0, sec=0, min=0, hour=0, Timer_on_Flag=0, B1_Flag = 0;
uint8_t time_buffer[256];

LoRa myLoRa;
uint16_t lora_init;
uint8_t Tx_information[20] = {0,};
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
void Init_LoRa();
void LoRa_Send();
/* 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_USART2_UART_Init();
  MX_RTC_Init();
  MX_TIM3_Init();
  MX_SPI2_Init();
  /* USER CODE BEGIN 2 */
  void Init_LoRa();

  if (HAL_TIM_Base_Start_IT(&htim3) != HAL_OK)
  {
	  Error_Handler();
  }
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
	_sec = sec;
	HAL_Delay(1);

	if (_B1_count > 100)
	{
		sec = 0;
		min = 0;
		hour = 0;
		Timer_on_Flag = 0;
	}

	if (_sec != sec)
	{
		//time print by UART
		sprintf(time_buffer, "%2d:%2d:%2d\n\n\r", hour, min, sec);
		HAL_UART_Transmit(&huart2, time_buffer, strlen(time_buffer), 100);

		//time print by CLCD
		//HD44780_Init(2);
		//HD44780_SetCursor(0,0);
		//HD44780_PrintStr(time_buffer);
	}

	LoRa_Send();
	HAL_Delay(100);
    /* 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_SCALE3);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 8;
  RCC_OscInitStruct.PLL.PLLN = 180;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  RCC_OscInitStruct.PLL.PLLQ = 2;
  RCC_OscInitStruct.PLL.PLLR = 2;
  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_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;

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

/* USER CODE BEGIN 4 */
void HAL_TIM_PeriodElapsedCallback (TIM_HandleTypeDef *htim)
{
	B1_count++;
	if (Timer_on_Flag == 1)
	{
		gTimerCnt++;
			if (gTimerCnt == 1000)
			{
				HAL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin);

				//MAJOR PART of this function
				gTimerCnt = 0;
				sec++;
			}
			if(sec>59)	{    sec=0;  min++;  }
			if(min>59)	{    min=0;  hour++; }
			if(hour>23)	{	hour=0;	}
	}
}

void HAL_GPIO_EXTI_Callback (uint16_t GPIO_Pin)
{
	switch (GPIO_Pin)
	{
	case B1_Pin:
		B1_Flag = 1 - B1_Flag;
		if (B1_Flag == 1)  B1_count = 0;
		if (B1_Flag == 0)
			{
				_B1_count = B1_count;
				Timer_on_Flag = 1 - Timer_on_Flag;
			}
		break;

	default:
		;
	}
}

void Init_LoRa()
{
	myLoRa = newLoRa();

	myLoRa.CS_port = NSS_GPIO_Port;
	myLoRa.CS_pin = NSS_Pin;
	myLoRa.reset_port = RESET_GPIO_Port;
	myLoRa.reset_pin = RESET_Pin;
	myLoRa.DIO0_port = DIO0_GPIO_Port;
	myLoRa.DIO0_pin = DIO0_Pin;
	myLoRa.hSPIx = &hspi2;

	myLoRa.frequency = 433 ;                   // LoRa Frequency    = 433MHz
	myLoRa.spredingFactor = SF_7;              // SpreadingFactor   = SF_7
	myLoRa.bandWidth = BW_125KHz;              // BandWidth         = BW_125KHz
	myLoRa.crcRate = CR_4_5;                   // crcRate           = CR_4_5
	myLoRa.power = POWER_20db;                 // Power db          = 20db
	myLoRa.overCurrentProtection = 120 ;       // CurrentProtection = 100mA
	myLoRa.preamble = 10 ;

	LoRa_reset(&myLoRa);

	lora_init = LoRa_init(&myLoRa);

}

void LoRa_Send()
{
	// Velocity1, Velocity2, Acceleration1, Acceleration2, Check1, Check2, Current, Voltage, Minute, Second
	for(int i = 0; i<20;i++)
	{
		Tx_information[i] = i;
	}

	LoRa_transmit(&myLoRa, Tx_information, 20, 100);
}
/* 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 */

 

4) rx측

동일하게 PIN Configuration, Clock configuration, 하고

헤더파일 추가하고