[嵌入式]蓝桥杯嵌入式第十二届省赛第一场

题目

题目和程序：阿里云盘链接

题目分析

1.LCD显示驱动
移植官方提供的LCD程序
2.PA7脉冲输出

只需要改变脉冲高电平时间即可。
3.uart
中断接受字符串，IDLE中断来判断字符串接受完成。

总结
1.比赛的时候在字符串处理部分浪费的时间较长，没看清题目要求的格式，导致没做完。字符串处理部分可以优化。
2.GPIO部分自己练的时候没注意LCD对LED的影响。练习的时候基本上没对多个操作，比赛的时候每次操作LED，其他灯也亮起来，傻眼了。后面重新写了驱动。

程序

cubemx初始化要用到的外设

用的平台：stm32g474re
1.配置时钟和debug



2.初始化用到按键的GPIO和PD2

先不初始化LED引脚

3.初始化tim3，和uart1


uart用中断接受

4·生成mdk5工程

程序

1.用官方提供的LCD程序，LCD有关的部分添加到生成的工程

如果新建文件夹的话，先把文件夹添加到头文件路径中
打开官方提供的LCD工程，在main.c里找到MX_GPIO_Init()函数，复制到自己的工程gpio.c
文件里，然后改名static void LCD_MX_GPIO_Init(void),然后在MX_GPIO_Init（）调用即可。

/**
  ******************************************************************************
  * @file    gpio.c
  * @brief   This file provides code for the configuration
  *          of all used GPIO pins.
  ******************************************************************************
  * @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
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "gpio.h"

/* USER CODE BEGIN 0 */

static void LCD_MX_GPIO_Init(void);
/* USER CODE END 0 */

/*----------------------------------------------------------------------------*/
/* Configure GPIO                                                             */
/*----------------------------------------------------------------------------*/
/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/** Configure pins as
        * Analog
        * Input
        * Output
        * EVENT_OUT
        * EXTI
*/
void MX_GPIO_Init(void)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();
  __HAL_RCC_GPIOD_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);

  /*Configure GPIO pin : PA0 */
  GPIO_InitStruct.Pin = GPIO_PIN_0;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pins : PB0 PB1 PB2 */
  GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2;
  GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : PD2 */
  GPIO_InitStruct.Pin = GPIO_PIN_2;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);

  LCD_MX_GPIO_Init();  //lcd有关gpio初始化
}

/* USER CODE BEGIN 2 */
/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void LCD_MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOF_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOC, GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_0 
                          |GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4 
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8 
                          |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOA, GPIO_PIN_8, GPIO_PIN_RESET);

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_5|GPIO_PIN_8|GPIO_PIN_9, GPIO_PIN_RESET);

  /*Configure GPIO pins : PC13 PC14 PC15 PC0 
                           PC1 PC2 PC3 PC4 
                           PC5 PC6 PC7 PC8 
                           PC9 PC10 PC11 PC12 */
  GPIO_InitStruct.Pin = GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15|GPIO_PIN_0 
                          |GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3|GPIO_PIN_4 
                          |GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7|GPIO_PIN_8 
                          |GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|GPIO_PIN_12;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : PA8 */
  GPIO_InitStruct.Pin = GPIO_PIN_8;
  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);

  /*Configure GPIO pins : PB5 PB8 PB9 */
  GPIO_InitStruct.Pin = GPIO_PIN_5|GPIO_PIN_8|GPIO_PIN_9;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

}
/* USER CODE END 2 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

tips：原理图可以发现，所有LED引脚和LCD引脚引脚共用，所有不用在cubemx里浪费时间初始化LED引脚。

编译器设置为armcompiler6，选择微库。armcompiler6编译速度快

复制LCD工程，main函数LCD有关部分的代码，编译下载测试是否移植正确

2.全部程序

1.LED和按键

uint16_t gpio = 0xff00; //高8位对应我们设置LED的状态
/*******************************************************************************
* Description    : open the led.
* Input          : led number (1-8)
* Return         : None
*******************************************************************************/
void led_on(uint8_t num)
{

    gpio = gpio & (~(0x80 << num));              //清零对应的位，不影响其他位
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位
    //更新到LED
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}
/*******************************************************************************
* Description    : close the led.
* Input          : led number (1-8)
* Return         : None
*******************************************************************************/
void led_off(uint8_t num)
{

    gpio = gpio | (0x80 << num);                 //置位应的位，不影响其他位
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);
    //HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7 << num, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}

/*******************************************************************************
* Description    : close all led.
* Input          : None
* Return         : None
*******************************************************************************/

void led_off_all(void)
{
    gpio = 0xff00;
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}
/*******************************************************************************
* Description    : get the keyvalue
* Input          : None
* Return         : None
*******************************************************************************/

key key_scan()
{
    key key_value = no_key;

    if ((HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET) || (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) ||
        (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET) || (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET))
    {
        HAL_Delay(20);
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET)
        {
            key_value = key1_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET)
        {
            key_value = key2_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET)
        {
            key_value = key3_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET)
        {
            key_value = key4_on;
            while (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
    }
    return no_key;
}

LED的话，因为LED和LCD共用引脚，每次写LCD 会会改变gpio的输出状态，所有用一个全局变量来保存LED的状态，每次操作LED，先写这个全局变量，然后更新到GPIOC的odr寄存器，否则的会出现干扰情况。（为了不影响GPIOC的第八位，可以先读取GPIOC，ODR，然后保存到gpio变量中，再次写入）uart
开接受中断，重定向printf

/**
  ******************************************************************************
  * @file    usart.c
  * @brief   This file provides code for the configuration
  *          of the USART instances.
  ******************************************************************************
  * @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
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "usart.h"
#include "stdio.h"
/* USER CODE BEGIN 0 */

/* USER CODE END 0 */

UART_HandleTypeDef huart1;

/* USART1 init function */

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 = 9600;
  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;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.Init.ClockPrescaler = UART_PRESCALER_DIV1;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
  if (HAL_UART_Init(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetTxFifoThreshold(&huart1, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_SetRxFifoThreshold(&huart1, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_UARTEx_DisableFifoMode(&huart1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN USART1_Init 2 */

  /* USER CODE END USART1_Init 2 */

}

void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{

  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(uartHandle->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspInit 0 */

  /* USER CODE END USART1_MspInit 0 */
    /* USART1 clock enable */
    __HAL_RCC_USART1_CLK_ENABLE();

    __HAL_RCC_GPIOA_CLK_ENABLE();
    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    GPIO_InitStruct.Pin = GPIO_PIN_9|GPIO_PIN_10;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* USART1 interrupt Init */
    HAL_NVIC_SetPriority(USART1_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspInit 1 */
    __HAL_UART_ENABLE_IT(&huart1,UART_IT_RXNE);    //开接受中断
  /* USER CODE END USART1_MspInit 1 */
  }
}

void HAL_UART_MspDeInit(UART_HandleTypeDef* uartHandle)
{

  if(uartHandle->Instance==USART1)
  {
  /* USER CODE BEGIN USART1_MspDeInit 0 */

  /* USER CODE END USART1_MspDeInit 0 */
    /* Peripheral clock disable */
    __HAL_RCC_USART1_CLK_DISABLE();

    /**USART1 GPIO Configuration
    PA9     ------> USART1_TX
    PA10     ------> USART1_RX
    */
    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_9|GPIO_PIN_10);

    /* USART1 interrupt Deinit */
    HAL_NVIC_DisableIRQ(USART1_IRQn);
  /* USER CODE BEGIN USART1_MspDeInit 1 */

  /* USER CODE END USART1_MspDeInit 1 */
  }
}

/* USER CODE BEGIN 1 */
//重定向printf
int fputc(int ch,FILE *f)
{
	while(__HAL_UART_GET_FLAG(&huart1,UART_FLAG_TXE)!=SET);
	huart1.Instance->TDR=(uint8_t)ch;
	return ch;
}
/* USER CODE END 1 */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

重写中断处理程序
按照hal库设定来写中断处理函数，比较啰嗦，低效

bsp.c

char rxbuff[50];

uint8_t uart_flag_rx = 0;
uint8_t uart_rx_index = 0;

stm32g4xx_it.c

void USART1_IRQHandler(void)
{
  /* USER CODE BEGIN USART1_IRQn 0 */
   uint8_t ch;
  
	if(__HAL_UART_GET_IT(&huart1,UART_IT_RXNE)==SET)
	{
     ch=huart1.Instance->RDR;
     
  {
     rxbuff[uart_rx_index++]=ch;
     
     
     uart_flag_rx=1;
    
     
  }
      __HAL_UART_CLEAR_IT(&huart1,UART_IT_RXNE);
  }
  /* USER CODE END USART1_IRQn 0 */

  //HAL_UART_IRQHandler(&huart1);
  /* USER CODE BEGIN USART1_IRQn 1 */

  /* USER CODE END USART1_IRQn 1 */
}

总的功能实现

#ifndef _BSP_H_
#define _BSP_H_

#include "main.h"
#include "lcd.h"
#include "usart.h"

typedef enum
{
    no_key,
    key1_on,
    key2_on,
    key3_on,
    key4_on
} key;

typedef struct
{
    uint8_t year;
    uint8_t mounth;
    uint8_t date;
    uint8_t hour;
    uint8_t minute;
    uint8_t second;
} time_s;

typedef enum
{
    NO_car,
    CNBR,
    VNBR
} cartype_e;

typedef struct
{
    cartype_e cartype;
    char bianhao[5];
    time_s time;
} car;

extern char rxbuff[50];
extern  uint8_t uart_flag_rx;
extern uint8_t uart_rx_index;
void led_on(uint8_t num);
void led_off_all(void);
void led_off(uint8_t num);
key key_scan();

void carbus_running(void);

#endif

#include "bsp.h"
#include "tim.h"
#include "stdio.h"
#include "string.h"
#include "stdlib.h"

#define ERROR printf("Error")
const uint8_t mouth_data[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

car carbus[8];   //代表车库，有8个车位

struct para_s
{
    float CNBR;
    float VNBR;
} para;

char rxbuff[50];

uint8_t uart_flag_rx = 0;
uint8_t uart_rx_index = 0;

uint16_t gpio = 0xff00; //高8位对应我们设置LED的状态
/*******************************************************************************
* Description    : open the led.
* Input          : led number (1-8)
* Return         : None
*******************************************************************************/
void led_on(uint8_t num)
{

    gpio = gpio & (~(0x80 << num));              //清零对应的位，不影响其他位
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位
    //更新到LED
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}
/*******************************************************************************
* Description    : close the led.
* Input          : led number (1-8)
* Return         : None
*******************************************************************************/
void led_off(uint8_t num)
{

    gpio = gpio | (0x80 << num);                 //置位应的位，不影响其他位
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);
    //HAL_GPIO_WritePin(GPIOC, GPIO_PIN_7 << num, GPIO_PIN_SET);
    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}

/*******************************************************************************
* Description    : close all led.
* Input          : None
* Return         : None
*******************************************************************************/

void led_off_all(void)
{
    gpio = 0xff00;
    GPIOC->ODR = gpio | ((GPIOC->ODR) & 0x00ff); //不影响低8位

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_SET);

    HAL_GPIO_WritePin(GPIOD, GPIO_PIN_2, GPIO_PIN_RESET);
}

/*******************************************************************************
* Description    : get the keyvalue
* Input          : None
* Return         : None
*******************************************************************************/

key key_scan()
{
    key key_value = no_key;

    if ((HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET) || (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET) ||
        (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET) || (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET))
    {
        HAL_Delay(20);
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET)
        {
            key_value = key1_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET)
        {
            key_value = key2_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET)
        {
            key_value = key3_on;
            while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
        if (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET)
        {
            key_value = key4_on;
            while (HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == GPIO_PIN_RESET)
                ;
            return key_value;
        }
    }
    return no_key;
}

/*******************************************************************************
* Description    : change the pwm captre PA7,更改pa7的模式
* Input          : None
* Return         : None
*******************************************************************************/

void pwm_change()
{
    uint32_t value = 0;

    value = __HAL_TIM_GET_COMPARE(&htim3, TIM_CHANNEL_2); //获取tim3，channnel2的ccr值
    if (value == 100)
    {
        led_off(2);
        __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_2, 0);
    }
    else if (value == 0)
    {
        led_on(2);
        __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_2, 100);
    }
    else
    {
        led_off(2);
        __HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_2, 0);
    }
}

void carbus_init()
{
    LCD_SetBackColor(Black);
    LCD_SetTextColor(White);

    para.CNBR = 3.50f;
    para.VNBR = 2.00f;
    for (int i = 0; i < 8; i++)
        carbus[i].cartype = NO_car;
}
/*******************************************************************************
* Description    : 
* Input          : None
* Return         : None
*******************************************************************************/
void show_data()
{
    char lcdbuff[20];
    uint16_t cnbr, vnbr;
    cnbr = 0;
    vnbr = 0;
    int i = 0;
    for (i = 0; i < 8; i++)
    {
        if (carbus[i].cartype == CNBR)
            cnbr++;
        else if (carbus[i].cartype == VNBR)
            vnbr++;
    }

    LCD_ClearLine(Line3);
    sprintf(lcdbuff, "   CNBR:%d", cnbr);
    LCD_DisplayStringLine(Line3, (uint8_t *)lcdbuff);
    LCD_ClearLine(Line5);
    sprintf(lcdbuff, "   VNBR:%d", vnbr);
    LCD_DisplayStringLine(Line5, (uint8_t *)lcdbuff);
    LCD_ClearLine(Line7);
    sprintf(lcdbuff, "   IDLE:%d", 8 - cnbr - vnbr);
    LCD_DisplayStringLine(Line7, (uint8_t *)lcdbuff);
    if (vnbr + cnbr == 8)
    {
        led_off(1);
    }
    else
        led_on(1);
}

void show_para_s()
{
    char lcdbuff[20];
    LCD_ClearLine(Line3);
    sprintf(lcdbuff, "   CNBR:%.2f", para.CNBR);
    LCD_DisplayStringLine(Line3, (uint8_t *)lcdbuff);
    LCD_ClearLine(Line5);
    sprintf(lcdbuff, "   VNBR:%.2f", para.VNBR);
    LCD_DisplayStringLine(Line5, (uint8_t *)lcdbuff);
}

/*******************************************************************************
* Description    : 计算2000年到2100年间输入的两个时间差
* Input          : @time_new:更 新的时间   
                   @time_old: 老的时间 两个都是时间结构体
* Return         : None
*******************************************************************************/
uint32_t calc(time_s time_new, time_s time_old)
{
    uint32_t time1, time2;
    uint32_t m1, t;
	  time1=time2=m1=0;
    int i=0;
    if (time_old.year % 4 == 0)
    {
        t = 1;
    }
    else
        t = 0;
    for (i = 1; i < time_old.mounth; i++)
    {
        m1 += mouth_data[i-1];
    }
    m1 = m1 + t + time_old.date;                                      //计算输入的是今年的那天
    time1 = (time_old.year - 1) * 365 + (time_old.year - 1) / 4 + m1; //2000起的第几天
    time1 = time1 * 24 * 60 + time_old.hour * 60 + time_old.minute;   //2000起的第几分钟
    time1 = time1 * 60 + time_old.second;

    m1 = 0;
    if (time_new.year % 4 == 0)
    {
        t = 1;
    }
    else
        t = 0;

    for (i = 1; i < time_new.mounth; i++)
    {
        m1 += mouth_data[i-1];
    }
    m1 = m1 + t + time_new.date;                                            //计算输入的是今年的那天
    time2 = (time_new.year - 1) * 365 + (time_new.year - 1) / 4 + m1; //2000起的第几天
    time2 = time2 * 24 * 60 + time_new.hour * 60 + time_new.minute;         //2000起的第几分钟
    time2 = time2 * 60 + time_new.second;
    if (time2 < time1)
        return 0xffffffff;

    time2 = time2 - time1; //算出两个时间差 

    time1 = time2 / 3600 + ((time2 % 3600 == 0) ? 0 : 1); //求差几个小时

    return time1;
}

void carbusdeal(car car1)
{
    int i = 0;
    uint32_t time1;
    float mony;

    //车已经存在
    for (i = 0; i < 8; i++)
    {
        if (carbus[i].cartype == car1.cartype)
        {
            if (strncmp(carbus[i].bianhao, car1.bianhao, 5) == 0)
            {
                time1 = calc(car1.time, carbus[i].time);
                if (time1 == 0xffffffff)
                {
                    ERROR;
                    return;
                }
                mony = time1 * ((car1.cartype == CNBR) ? para.CNBR : para.VNBR);
                carbus[i].cartype = NO_car;
                printf("%s:%s:%d:%.2f", ((car1.cartype == CNBR) ? "CNBR" : "VNBR"), car1.bianhao, time1, mony);

                return;
            }
        }
    }

    //车刚入库
    for (i = 0; i < 8; i++)
    {
        if (carbus[i].cartype == NO_car)
        {
            carbus[i] = car1;
            return;
        }
    }

    //无车位
    ERROR;
}

void uart_string_deal()
{
    uint8_t strlenth = strlen(rxbuff);
    if (strlenth != 22)
    {
        printf("Error");
        memset(rxbuff, 0, 50);
        return;
    }
    car car1;
    char buff[5];
    int i = 0;
    for (i = 0; i < 4; i++)
    {
        buff[i] = rxbuff[i];
    }
    buff[4] = '\0';
    if (strncmp(buff, "VNBR", 5) == 0)
    {
        car1.cartype = VNBR;
    }
    else if (strncmp(buff, "CNBR", 5) == 0)
    {
        car1.cartype = CNBR;
    }
    else
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 5; i < 9; i++)
    {
        car1.bianhao[i - 5] = rxbuff[i];
    }
    car1.bianhao[4] = '\0';

    for (i = 10; i < 12; i++)
    {
        buff[i - 10] = rxbuff[i];
    }
    buff[2] = '\0';
    buff[3] = '\0';
    buff[4] = '\0';
    car1.time.year = atoi(buff);
    if (car1.time.year > 99 || car1.time.year < 0)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 12; i < 14; i++)
    {
        buff[i - 12] = rxbuff[i];
    }

    car1.time.mounth = atoi(buff);
    if (car1.time.mounth < 1 || car1.time.mounth > 12)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 14; i < 16; i++)
    {
        buff[i - 14] = rxbuff[i];
    }

    car1.time.date = atoi(buff);
    if (car1.time.date < 1 || car1.time.date > 31)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 16; i < 18; i++)
    {
        buff[i - 16] = rxbuff[i];
    }

    car1.time.hour = atoi(buff);
    if (car1.time.hour < 0 || car1.time.hour > 23)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 18; i < 20; i++)
    {
        buff[i - 18] = rxbuff[i];
    }

    car1.time.minute = atoi(buff);
    if (car1.time.minute < 0 || car1.time.minute > 59)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    for (i = 20; i < 22; i++)
    {
        buff[i - 20] = rxbuff[i];
    }

    car1.time.second = atoi(buff);
    if (car1.time.second < 0 || car1.time.second > 59)
    {
        ERROR;
        memset(rxbuff, 0, 50);
        return;
    }

    memset(rxbuff, 0, 50);

    carbusdeal(car1);
}

void carbus_running()
{
    key key_v = no_key;
    carbus_init();
    LCD_Clear(Black);
    LCD_DisplayStringLine(Line1, (uint8_t *)"      Data         ");
    show_data();
    while (1)
    {
        key_v = key_scan();
        if (key_v == key1_on)
        {
            LCD_Clear(Black);
            LCD_DisplayStringLine(Line1, (uint8_t *)"       Para         ");
            show_para_s();
            while (1)
            {
                key_v = key_scan();
                if (key_v == key2_on)
                {
                    para.VNBR += 0.5f;
                    para.CNBR += 0.5f;
                    show_para_s();
                }
                else if (key_v == key3_on)
                {
                    if (para.VNBR < 0.5f)
                    {
                        continue;
                    }
                    para.VNBR -= 0.5f;
                    para.CNBR -= 0.5f;
                    show_para_s();
                }
                else if (key_v == key4_on)
                {
                    pwm_change();
                }
                else if (key_v == key1_on)
                {
                    LCD_Clear(Black);
                    LCD_DisplayStringLine(Line1, (uint8_t *)"       Data         ");
                    show_data();
                    break;
                }
            }
        }
        else if (key_v == key4_on)
        {
            pwm_change();
        }
                  //接受完成标志
        if ((uart_flag_rx == 1) && (__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE)==1))             
        {
            uart_string_deal();
            uart_flag_rx = 0;
            uart_rx_index=0;
            show_data();
        }
    }
}