[임베디드] ARM STM32F103 Nucleo-64 시리얼 통신

1. 서론

 

  ARM 코딩 공부 중 시리얼 통신 필요해서 구현 중. 시리얼 통신 시 인터럽트 없으면 1글자밖에 못 받는거 인터럽트로 여러 문자 받을 수 있게 구현

 

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2. 본문

 

• STM32CubeMX 설정

STM32CubeMX 설정 (1)

STM32CubeMX 설정 (2)

< 꼭 글로벌 인터럽트 Enabled 해야함 >

• ㄲHAL_UART_RxCpltCallback 함수로 시리얼 통신 인터럽트 발생시 아래 로직에 따라 동작

/* USER CODE BEGIN 0 */

int fputc(int ch, FILE *f){
	uint8_t temp[1] = {ch};
	HAL_UART_Transmit(&huart2, temp, 1, 50);
	return (ch);
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef * huart){ //** 인터럽트 시 동작 **/ 
	if(huart->Instance == huart2.Instance){
		 if(Rx_indx==0 ){
			 for ( int i = 0 ; i < 100 ; i++){ //clear buffer
				 Rx_Buffer[i] = 0;
			 }
		 }
		 //printf("%c",Rx_data);
		 Rx_Buffer[Rx_indx++] = Rx_data;
		 /**
		 if(Rx_data == 'a'){
			 Rx_indx = 0;
			 EndOfTrans= 1;
		 }
		 */
		 
		 if(Rx_data == '\n'){ // 문자열 바꿈 입력 시
			 Rx_indx = 0;
			 EndOfTrans= 1;
		 }
		 if(Rx_indx == 100){
			 Rx_indx = 0;
			 EndOfTrans= 1;
		 }
		 HAL_UART_Receive_IT(&huart2, &Rx_data, 1); // 시리얼통신 인터럽트 한글자 받을 시 동작
		 
	}
}

 

 

• int main 안에 while로 반복 전 HAL_UART_Receive_IT 함수로 위의 콜백함수가 동작할 수 있도록 설정

  /* USER CODE BEGIN 2 */
	
	//이하 생략
	printf("hello world! \r\n"); // fputc 함수로 인해서 printf로 결과출력 가능 -> 시리얼로 전달함
	HAL_UART_Receive_IT(&huart2, &Rx_data,1); // activate uart rx interrupt everytime receiveing 1 byte
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
		if(EndOfTrans == 1){
			sprintf(TmpBuffer,"%s",Rx_Buffer);
			printf("Data : %s \r\n", TmpBuffer);
			EndOfTrans = 0;
			HAL_Delay(100);
			
		}
        /* 이하 생략 */
        
   }
        
        
        

 

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3. 결론

 

•   전체 테스트한 코드

/* 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 "stdio.h"
#include "string.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 */
/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
UART_HandleTypeDef huart1;
UART_HandleTypeDef huart2;

char TmpBuffer[102];
int len;
char Rx_indx;
char Rx_data;
char Rx_Buffer[100],EndOfTrans;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_USART2_UART_Init(void);
static void MX_USART1_UART_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

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

int fputc(int ch, FILE *f){
	uint8_t temp[1] = {ch};
	HAL_UART_Transmit(&huart2, temp, 1, 50);
	return (ch);
}

void HAL_UART_RxCpltCallback(UART_HandleTypeDef * huart){
	if(huart->Instance == huart2.Instance){
		 if(Rx_indx==0 ){
			 for ( int i = 0 ; i < 100 ; i++){ 
				 Rx_Buffer[i] = 0;
			 }
		 }
		 Rx_Buffer[Rx_indx++] = Rx_data;
		 		 
		 if(Rx_data == '\n'){
			 Rx_indx = 0;
			 EndOfTrans= 1;
		 }
		 if(Rx_indx == 100){
			 Rx_indx = 0;
			 EndOfTrans= 1;
		 }
		 HAL_UART_Receive_IT(&huart2, &Rx_data, 1); 
		 
	}
}
		 
/* 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_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
	
	
	printf("hello world! \r\n");
	HAL_UART_Receive_IT(&huart2, &Rx_data,1); 
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
		if(EndOfTrans == 1){
			sprintf(TmpBuffer,"%s",Rx_Buffer);
			printf("Data : %s \r\n", TmpBuffer);
			EndOfTrans = 0;
			HAL_Delay(100);
			
		}
		
		HAL_GPIO_WritePin(GPIOA, LD2_Pin, GPIO_PIN_SET);
		
		HAL_Delay(100) ;
		HAL_GPIO_WritePin(GPIOA, LD2_Pin, GPIO_PIN_RESET);
			HAL_GPIO_WritePin(GPIOA, Custom_LED_CTL_Pin, GPIO_PIN_SET);
			HAL_Delay(100) ;
		HAL_GPIO_WritePin(GPIOA, LD2_Pin|Custom_LED_CTL_Pin, GPIO_PIN_RESET);
		
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  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_DIV2;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL16;
  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_2) != HAL_OK)
  {
    Error_Handler();
  }
}

/**
  * @brief USART1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART1_UART_Init(void)
{

  /* USER CODE BEGIN USART1_Init 0 */

  /* USER CODE END USART1_Init 0 */

  /* USER CODE BEGIN USART1_Init 1 */

  /* USER CODE END USART1_Init 1 */
  huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_TX_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

/**
  * @brief USART2 Initialization Function
  * @param None
  * @retval None
  */
static void MX_USART2_UART_Init(void)
{

  /* USER CODE BEGIN USART2_Init 0 */

  /* USER CODE END USART2_Init 0 */

  /* USER CODE BEGIN USART2_Init 1 */

  /* USER CODE END USART2_Init 1 */
  huart2.Instance = USART2;
  huart2.Init.BaudRate = 115200;
  huart2.Init.WordLength = UART_WORDLENGTH_8B;
  huart2.Init.StopBits = UART_STOPBITS_1;
  huart2.Init.Parity = UART_PARITY_NONE;
  huart2.Init.Mode = UART_MODE_TX_RX;
  huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart2.Init.OverSampling = UART_OVERSAMPLING_16;
  if (HAL_UART_Init(&huart2) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART2_Init 2 */

  /* USER CODE END USART2_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_GPIOD_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, LD2_Pin|Custom_LED_CTL_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : B1_Pin */
  GPIO_InitStruct.Pin = B1_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);

  /*Configure GPIO pins : LD2_Pin Custom_LED_CTL_Pin */
  GPIO_InitStruct.Pin = LD2_Pin|Custom_LED_CTL_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /* EXTI interrupt init*/
  HAL_NVIC_SetPriority(EXTI15_10_IRQn, 0, 0);
  HAL_NVIC_EnableIRQ(EXTI15_10_IRQn);

}

/* 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****/

 

•   결과

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4. 맺음말

 

  ARM 펌웨어 개발을 위해 여러가지 공부중에 있습니다. 기타 다양한 의견 주시면 감사하겠습니다.