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：

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：

/* 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 */