蓝桥杯嵌入式用按键设置密码

Question

问题描述：用按键控制屏幕上的数字增加，同一种写法，按键二、三均能实现，但按键一不按下数字自增

代码：

/////////////////////////////////////////*********************** 重点一：按键****************////////////////////
u8 key_Process(void)
{
    if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == 0)     //PB0=0代表按键被按下
    {
        HAL_Delay(10);                                 //一定要写防抖
        if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == 0)
        {
            while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_0) == 0)       //等待抬起
                return 1;
        }
    }
    
    if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == 0)     //PB1=0代表按键被按下
    {
        HAL_Delay(10);                                 //一定要写防抖
        if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1 )== 0)
        {
            while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_1) == 0)       //等待抬起
                return 2;
        }
    }
    
    if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == 0)     //PB2=0代表按键被按下
    {
        HAL_Delay(10);                                 //一定要写防抖
        if(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2 )== 0)
        {
            while(HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_2) == 0)       //等待抬起
                return 3;
        }
    }
    
    if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == 0)     //PA0=0代表按键被按下
    {
        HAL_Delay(10);                                 //一定要写防抖
        if(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == 0)
        {
            while(HAL_GPIO_ReadPin(GPIOA, GPIO_PIN_0) == 0)       //等待抬起
                return 4;
        }
    }        
}

/////////////////////////////////////////*********************** 重点一：按键****************////////////////////



/* 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_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
    
    LCD_Init();
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
    
    LCD_Clear(Black);
    LCD_SetBackColor(Black);
    LCD_SetTextColor(White);


    int key_value = 0;
    
    int page_index = 1;               //定义页面索引，等于一时为页面1，等于二时为页面2
    
    int B1 = -1;
    int B2 = -1;
    int B3 = -1;
    
    char buf[32] = { 0 };
    
  while (1)
  {
        key_value = key_Process();                                              //key_Process传的值是按键
        
        if(page_index == 1)                         //假如当前页面为一页面
        {
            LCD_DisplayStringLine(Line1 ,(unsigned char *)"       PSD       ");
            
            if(B1 == -1)
            {
                LCD_DisplayStringLine(Line4 ,(unsigned char *)"     B1:@        ");
            }
            else
            {
                sprintf(buf, "     B1:%d        ", B1);
                LCD_DisplayStringLine(Line4 ,(unsigned char *)buf);
            }
            
            if(B2 == -1)
            {
                LCD_DisplayStringLine(Line5 ,(unsigned char *)"     B2:@        ");
            }
            else
            {
                sprintf(buf, "     B2:%d        ", B2);
                LCD_DisplayStringLine(Line5 ,(unsigned char *)buf);
            }
            
            if(B3 == -1)
            {
                LCD_DisplayStringLine(Line6 ,(unsigned char *)"     B3:@        ");
            }
            else
            {
                sprintf(buf, "     B3:%d        ", B3);
                LCD_DisplayStringLine(Line6 ,(unsigned char *)buf);
            }
            
////////////////////////////////////////密码逻辑//////////////////////////////////////////////
            
        if(key_value == 1)                                 //按键二被按下
        {
            B1++;
            if(B1 == 10)
                B1 = 0;
            HAL_Delay(100);
        }
        
        if(key_value == 2)                                 //按键二被按下
        {
            B2++;
            if(B2 == 10)
                B2 = 0;
            HAL_Delay(100);
        }
        
        if(key_value == 3)                                 //按键三被按下
        {
            B3++;
            if(B3 == 10)
                B3 = 0;
        }
        
        
        
        if(key_value == 4)                                 //按键四被按下
            //按键四被按下时，表示密码验证，如果密码正确，贼跳转页面
        {
            page_index = 2;                          //在这里切换成页面二
        }
            
            
            
        }
        else                                          //显示第二个页面
        {
            LCD_DisplayStringLine(Line1 ,(unsigned char *)"       STA       ");
            
            LCD_DisplayStringLine(Line4 ,(unsigned char *)"     F:2000Hz        ");
            
            LCD_DisplayStringLine(Line5 ,(unsigned char *)"     D:10%           ");
            
            LCD_DisplayStringLine(Line6 ,(unsigned char *)"                    ");
        }
        
        

Answer 1

没有按键按下时让key_Process(void)函数返回0