蓝桥杯嵌入式第12届真题(完成) STM32G431

题目

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程序

main.c

/* 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 "tim.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "led.h"
#include "key.h"
#include "usart1.h"
#include "stdio.h"
#include "string.h"
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
uint8_t view = 1;
uint8_t carnums = 8;
uint8_t CNBRnums = 2;
uint8_t VNBRnums = 4;
uint8_t IDLEnums = 2;
float CNBRprice = 3.50f;
float VNBRprice = 2.00f;
uint8_t lcdtext[20];
extern struct Key key[4];
uint8_t pwm = 0;
extern uint8_t rxflag;
extern uint8_t rxdata[1];
extern uint8_t rxindex;
extern uint8_t rxbuffer[22];
uint8_t cartype[4];
uint8_t carnum[4];
uint8_t cartime[12];
uint8_t printtext[30];
struct Times
{
  int year;
	int month;
	int day;
	int hour;
	int min;
};
struct Cars // 串口接收
{
	char carKind[5]; //车型
	char carNum[5];  //车牌号
	char carTime[12]; //进入时间
	struct Times Time;
};

struct Cars car;
struct Cars park[8]={0,0,0,0,0,0,0,0}; 
float stopprice;
uint8_t led,led1enable,led2enable;
int monthDays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
uint8_t isError = 0;
/* 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 */
void key_process(void);
void usart1_process(void);
void lcd_process(void);
void led_process(void);
void outpark(uint8_t car_num);
void inpark(void);
void isErrorProcess(void);
void lcdclear(void);
int isLeapYear(int year);
long dateToTotalMinutes(struct Times t);
/* 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_TIM2_Init();
  MX_TIM17_Init();
  MX_USART1_UART_Init();
	HAL_TIM_Base_Start_IT(&htim2);
	HAL_UART_Receive_IT(&huart1,rxdata,1);
  /* USER CODE BEGIN 2 */

    LCD_Init();
		lcdclear();
		led_Display(0x00);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */



   

    while (1)
    {
				key_process();
				usart1_process();
				lcd_process();
				led_process();
			isErrorProcess();
    /* 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};

  /** Configure the main internal regulator output voltage
  */
  HAL_PWREx_ControlVoltageScaling(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.PLLM = RCC_PLLM_DIV2;
  RCC_OscInitStruct.PLL.PLLN = 20;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  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_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the peripherals clocks
  */
  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
  PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  {
    Error_Handler();
  }
}

/* USER CODE BEGIN 4 */
void key_process(void)
{
	if(key[0].key_single_flag)
	{
		key[0].key_single_flag = 0;
		if(view==1)
		{
			view = 2;
		}else{
			view = 1;
		}
		
	}
	if(key[1].key_single_flag)
	{
		key[1].key_single_flag = 0;
		if(view==2)
		{
			CNBRprice+=0.5f;
			VNBRprice+=0.5f;
			
		}
	}
	if(key[2].key_single_flag)
	{
		key[2].key_single_flag = 0;
		if(view==2)
		{
			CNBRprice-=0.5f;
			VNBRprice-=0.5f;
			
		}
	}
	if(key[3].key_single_flag)
	{
		key[3].key_single_flag = 0;
		pwm=!pwm;
		if (pwm)
		{
			HAL_TIM_PWM_Start(&htim17,TIM_CHANNEL_1);
			__HAL_TIM_SET_COMPARE(&htim17,TIM_CHANNEL_1,200);
		}else{
			
			HAL_TIM_PWM_Stop(&htim17, TIM_CHANNEL_1); // 停止PWM
			HAL_GPIO_WritePin(GPIOA, GPIO_PIN_7, GPIO_PIN_RESET); // 设置PA7为低电平
		}
	}
	
}
void outpark(uint8_t car_num)
{
   
		sscanf(car.carTime, "%4d%2d%2d%2d%2d", &car.Time.year, &car.Time.month, &car.Time.day, &car.Time.hour, &car.Time.min);
    // 计算两个时间点的总分钟数
    long carTimeInMin = dateToTotalMinutes(car.Time);
    long parkTimeInMin = dateToTotalMinutes(park[car_num].Time);
    // 计算经过的总时间（以分钟为单位），并转换为小时
    long diffInMin = carTimeInMin - parkTimeInMin;
    int hoursPassed = diffInMin / 60;
    // 如果不满一小时，则按一小时计算
    if(diffInMin % 60 > 0) {
        hoursPassed++;
    }

    // 保证至少为1小时
    if(hoursPassed <= 0) {
        hoursPassed = 1;
    }
		if(strcmp(car.carKind,"VNBR") ==0)
		{
			VNBRnums --;
			IDLEnums ++;
			stopprice=hoursPassed*VNBRprice;
		}else if(strcmp(car.carKind,"CNBR") ==0)
		{
			CNBRnums --;
			IDLEnums ++;
			stopprice=hoursPassed*CNBRprice;
		}
		memset(&park[car_num],0,sizeof(park[car_num]));
    sprintf((char *)printtext,"%s:%s:%d:%.2f\r\n",car.carKind,car.carNum,hoursPassed,stopprice);
		HAL_UART_Transmit(&huart1,printtext,strlen((char *)printtext),50);

    
}

void inpark(void)
{
		sscanf(car.carTime, "%4d%2d%2d%2d%2d", &car.Time.year, &car.Time.month, &car.Time.day, &car.Time.hour, &car.Time.min);
    for (int i = 0; i < 8; i++) {
        // 查找第一个空位
        if (park[i].carNum[0] == '\0') { // 假设未使用的车位carNum为'\0'
            park[i] = car;

            // 更新车位统计信息
            if (strcmp(car.carKind, "CNBR") == 0) {
                CNBRnums++;
                IDLEnums--;
            } else if (strcmp(car.carKind, "VNBR") == 0) {
                VNBRnums++;
                IDLEnums--;
            }

            break; // 退出循环
        }
    }

}


void usart1_process(void)
{
	if(rxflag)
	{
		rxflag = 0;
		rxindex = 0;
		int parsedItems = sscanf((char*)rxbuffer,"%4s:%4s:%12s",car.carKind,car.carNum,car.carTime);
		if(parsedItems == 3)
		{
			if(strcmp(car.carKind,"CNBR")==0||strcmp(car.carKind,"VNBR")==0)//格式正确
			{
				for(int i = 0;i < 8;i++)
				{
					if(strcmp(park[i].carNum,car.carNum)==0) //车库中有，需要出库
					{
						if(strcmp(park[i].carKind,car.carKind) == 0)
						{
							outpark(i);
							break;
						}else{
							isError = 1;
						}
					}else if(strcmp(park[i].carNum,car.carNum)!=0&&IDLEnums>0)//车库中没有需要，入库
					{
						inpark();
						break;
					}
				}
			
			}else
        {
            isError = 1;
        }
			
		}else
			{
					isError = 1;
			}
		rxflag = 0;
		rxindex = 0;
		HAL_UART_Receive_IT(&huart1,rxdata,1);
	}
}

void isErrorProcess(void)
{
	if(isError == 1)
	{
		sprintf((char *)printtext,"Error\r\n");
		HAL_UART_Transmit(&huart1,(uint8_t*)printtext,strlen((char *)printtext),50);
		isError = 0;
	}
}
void lcd_process(void)
{
	switch (view)
  {
  	case 1://车位显示页面
		{
			sprintf((char *)lcdtext,"       Data");
			LCD_DisplayStringLine(Line1,lcdtext);
			sprintf((char *)lcdtext,"  CNBR:%d",CNBRnums);
			LCD_DisplayStringLine(Line3,lcdtext);
			sprintf((char *)lcdtext,"  VNBR:%d",VNBRnums);
			LCD_DisplayStringLine(Line5,lcdtext);
			sprintf((char *)lcdtext,"  IDLE:%d",IDLEnums);
			LCD_DisplayStringLine(Line7,lcdtext);
		}
  	break;
  	case 2: //费率设置页面
		{
			sprintf((char *)lcdtext,"       Para");
			LCD_DisplayStringLine(Line1,lcdtext);
			sprintf((char *)lcdtext,"  CNBR:%.2f",CNBRprice);
			LCD_DisplayStringLine(Line3,lcdtext);
			sprintf((char *)lcdtext,"  VNBR:%.2f",VNBRprice);
			LCD_DisplayStringLine(Line5,lcdtext);
		}
  		break;
  }
}
void led_process(void)
{
	if(IDLEnums>0)
	{
		led1enable = 1;
	}else{
		led1enable = 0;
	}
	if(pwm==1)
	{
		led2enable = 1;
	}else{
		led2enable = 0;
	}
	if(led1enable)
	{
		led|=0x01;
	}else{
		led&=~0x01;
	}
	if(led2enable)
	{
		led|=0x02;
	}else{
		led&=~0x02;
	}
	led_Display(led);
}

void lcdclear()
{
    LCD_Clear(Black);
    LCD_SetBackColor(Black);
    LCD_SetTextColor(White);
}

int isLeapYear(int year) {
    if (year % 4 != 0) return 0;
    if (year % 100 != 0) return 1;
    if (year % 400 == 0) return 1;
    return 0;
}
long dateToTotalMinutes(struct Times t) {
    // 添加之前的年份所包含的分钟数
    long totalMinutes = (t.year - 1) * 365 * 24 * 60;
    
    // 添加闰年的额外分钟数
    totalMinutes += ((t.year - 1) / 4 - (t.year - 1) / 100 + (t.year - 1) / 400) * 24 * 60;
    
    // 添加当前年份中之前月份的分钟数
    for (int i = 0; i < t.month - 1; i++) {
        totalMinutes += monthDays[i] * 24 * 60;
    }
    
    // 如果当前年份是闰年并且月份大于2，则额外添加一天的分钟数
    if (t.month > 2 && isLeapYear(t.year)) totalMinutes += 24 * 60;
    
    // 添加当前月份中的天数、小时和分钟
    totalMinutes += (t.day - 1) * 24 * 60; // 天数减1，因为当天不满24小时
    totalMinutes += t.hour * 60;
    totalMinutes += t.min;

    return totalMinutes;
}
/* 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 */

  /* 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,
       tex: 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****/

key.c

#include "key.h"
struct Key key[4]={0,0,0,0};
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
{
	if(htim->Instance==TIM2)
	{
		 key[0].key_gpio =  HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0);
		 key[1].key_gpio =  HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1);
		 key[2].key_gpio =  HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2);
		 key[3].key_gpio =  HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0);
		 for(int i = 0;i<4;i++)
     {
			 switch (key[i].key_status)
       {
				 case 0:
				{
					if(key[i].key_gpio==0)
					{
						key[i].key_status = 1;
					}
				}
       		break;
       	case 1:
				{
					if(key[i].key_gpio==0)
					{
						key[i].key_single_flag = 1;
						key[i].key_status = 2;
					}else{
						key[i].key_status = 0;
					}
				}
       		break;
       	case 2:
				{
					if(key[i].key_gpio==1)
					{
						
						key[i].key_status = 0;
					}
					
				}
       	break;
       }
     }
	}
	
}

led.c

#include "led.h"

void led_Display(uint8_t led)
{
	HAL_GPIO_WritePin(GPIOC,GPIO_PIN_All,GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);
	HAL_GPIO_WritePin(GPIOC,led<<8,GPIO_PIN_RESET);
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);
}

usart1.c

#include "usart1.h"
#include "usart.h"
#include "string.h"
uint8_t rxflag;
uint8_t rxdata[1];
uint8_t rxindex = 0;
uint8_t rxbuffer[22];

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
		if(huart->Instance==USART1)
		{
			rxbuffer[rxindex++] = rxdata[0];
			HAL_UART_Receive_IT(huart,rxdata,1);
			if(rxindex==22)
			{
				rxflag = 1;
			}
		}

}

程序很常规，只有串口那里处理比较麻烦，有几个注意事项

  • 使用或和与操作实现单独对led某一位进行操作
  • 需要判断闰年
  • 处理错误，有好几种
  • sscanf解析字符串
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