第十三届蓝桥杯物联网试题（省赛）

做后感悟：

OLED显示函数需要一直显示，所以在主函数中要一直循环，为了确保这个检错功能error只输出一次，最好用中断串口进行接收数据，数据收完后自动进入中断函数中，做一次数据检查就好了，该开灯开灯，检查后还可以更新计数器，要是用普通串口接收的话事情要麻烦的多

代码：

c 复制代码

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart){  // 中断串口
	Function_CheckUrxReceive(URxdata[0]);  //检查更新灯泡状态
	Function_OledShowError(Function_GetCheckflag());  // 显示error
}

void Function_CheckUrxReceive(unsigned char receive){
	if(receive == '@') Function_Ld5Toggle();
	else if(receive == '#') Function_Ld2Toggle();
	else if(receive == '$') Function_Ld3Toggle();
	else {
		checkflag = 0;
		return;
	}
	checkflag = 1;
}

unsigned char Function_GetCheckflag(){
	if(checkflag == 1){
		checkflag = 0;
		Rxnumber = Rxnumber + 1;
	  return 1;
	}
  return 0;
}

需要一个标志位查看是否显示错误信息，还能更新计数器

开中断串口也不难，USART2 异步通信中断enable就可以了非常的好用

一定一定要注意的一点是串口中断函数内不要放延时函数，谁用谁知道，系统直接卡死！！！

按键：

对于按键来说，我个人感觉中断按键要比ReadPin按键要丝滑，中断按键点一下就有反应，普通按键要按一会儿再松开才行，点太快可能没反应，我建议用中断按键，中断按键需要点击外部中断，再选择中断方式，再enable一下即可

最后对于代码的排版，最好是能将所有代码放入一个.c文件内，全局变量，都写在里面，最后通过一到两个函数给主函数调用

发现了一个有趣的现象，当中断函数中有oledshowstring函数想显示一个字符串，主函数的while函数中也有一个显示函数的时候，这个时候触发中断，中断函数中的显示函数无法被执行，当主函数代码量增多的时候，中断函数的显示函数有可能被执行，我想原因大概是主函数在显示数据的时候写一半突然中断后，进入中断内的显示函数，显示标无法被调整，这可能是OLED函数的代码原因，解决方法，就是主函数的显示函数后加一些延时即可，在延时期间进入中断写字符串，避免主函数正在写字符串，突然被叫到中断中写字符串

问题代码：

c 复制代码

/* 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 "i2c.h"
#include "gpio.h"
#include "Function.h"
#include "oled.h"
#include <stdio.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 ---------------------------------------------------------*/

/* USER CODE BEGIN PV */

/* USER CODE END PV */

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

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
unsigned char c[1];
void HAL_GPIO_EXTI_Callback(uint16_t GPIO_Pin){
	   OLED_ShowString(0, 2, "okokokok", 16);
		 char b = HAL_GPIO_ReadPin(KEY_USER_GPIO_Port, KEY_USER_Pin);
		 sprintf((char*)c, "%d",b);
     
	  //if(GPIO_Pin == KEY_USER_Pin)
	    
		//OLED_Clear();
	   
}
/* 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_I2C3_Init();
  /* USER CODE BEGIN 2 */
  Function_OledInit(50);
  /* USER CODE END 2 */
  unsigned char a[1];
  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */
    char b = HAL_GPIO_ReadPin(KEY_USER_GPIO_Port, KEY_USER_Pin);
		//sprintf(a, "%d", b);
		OLED_ShowString(0, 0, "123", 16);
		 sprintf(a, "%d", b);
		 //HAL_Delay(1000);
    /* 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};

  /** Configure the main internal regulator output voltage
  */
  __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_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;
  RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4;
  RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
  {
    Error_Handler();
  }
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_I2C3;
  PeriphClkInit.I2c3ClockSelection = RCC_I2C3CLKSOURCE_PCLK1;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != 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 */
  __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 */