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蓝桥杯嵌入式第12届真题(完成) STM32G431

news 2025/7/8 15:46:01

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PWMHAL_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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