突击蓝桥杯嵌入式（十二）——第十二届省赛第一场真题 停车场

所需：
PA7 PWM LED(锁存器) 串口9600 LCD 按键4个，整体难在逻辑，我们先配置好硬件，进入工程

PA7要求：2KHZ,初始化占空比0 串口一，打开接收中断

首先我们大概想一下轮廓，首先一辆车进来，我们第一要判断他这个车在不在我们的停车场里，然后如果在的话，就给他结账，如果不在的话，我们需要判断现在停车场里是否有车位，如果有，则保存其信息，如果没有，则不管。

先把八股文写一下：

按键：

uint8_t Key_Scan()
{
	static uint8_t value;
	if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_0) == GPIO_PIN_RESET)	value = 1;
	else if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_1) == GPIO_PIN_RESET)	value = 2;
	else if(HAL_GPIO_ReadPin(GPIOB,GPIO_PIN_2) == GPIO_PIN_RESET)	value = 3;
	else if(HAL_GPIO_ReadPin(GPIOA,GPIO_PIN_0) == GPIO_PIN_RESET)	value = 4;
	else		value = 0;
	return value;
}

void Key_Proc()
{
	if(uwTick - uwTick_Key_Speed < 100)	return;
	else		uwTick_Key_Speed = uwTick;
	key_value = Key_Scan();
	key_up = -key_value&(key_value ^ key_old);
	key_down = key_value&(key_value ^ key_old);
	key_old = key_value;
	switch(key_down)
	{
		case 1:
				LCD_flag^=1;
		break;
		
		case 2:
			if(LCD_flag == 1)
			{
				CNBR_Price += 0.5;
				VNBR_Price += 0.5;
			}
		break;
		
		case 3:
			if(LCD_flag == 1)
			{
				CNBR_Price -= 0.5;
				VNBR_Price -= 0.5;
				if(VNBR_Price < 0)
				{
					VNBR_Price = 0;
				}
				if(CNBR_Price < 0)
				{
					CNBR_Price = 0;
				}
			}
		break;
		
		case 4:
			control_flag ^= 1;
		break;
	}

LCD

void LCD_DISPLAY_Data()
{
	sprintf((char *)str,"       Data       ");
	LCD_DisplayStringLine(Line1,str);
	sprintf((char *)str,"   CNBR:       ");
	LCD_DisplayStringLine(Line3,str);
	sprintf((char *)str,"   VNBR:       ");
	LCD_DisplayStringLine(Line5,str);
	sprintf((char *)str,"   IDLE:       ");
	LCD_DisplayStringLine(Line7,str);
}

void LCD_DISPLAY_Para()
{
	sprintf((char *)str,"       Para       ");
	LCD_DisplayStringLine(Line1,str);
	sprintf((char *)str,"   CNBR:%.2f       ",CNBR_Price);
	LCD_DisplayStringLine(Line3,str);
	sprintf((char *)str,"   VNBR:%.2f       ",VNBR_Price);
	LCD_DisplayStringLine(Line5,str);
	sprintf((char *)str,"                ");
	LCD_DisplayStringLine(Line7,str);
}



void LCD_Proc()
{
	if(uwTick - uwTick_LCD_Speed < 100)	return;
	else		uwTick_LCD_Speed = uwTick;
	if(LCD_flag == 0)	LCD_DISPLAY_Data();
	else		LCD_DISPLAY_Para();
	if( control_flag == 0)	TIM3->CCR2 = 0;
	else										TIM3->CCR2 = 100;
	if(process_flag == 1)	data_process(car_data[22]);
	else	return;
}

LED

void LED_Disp(uint8_t ucled)
{
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOC,GPIO_PIN_8|GPIO_PIN_9|GPIO_PIN_10|GPIO_PIN_11|
							GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_14|GPIO_PIN_15,GPIO_PIN_SET);
	HAL_GPIO_WritePin(GPIOC,ucled<<8,GPIO_PIN_RESET);
	HAL_GPIO_WritePin(GPIOD,GPIO_PIN_2,GPIO_PIN_RESET);
}

void LED_Proc()
{
	int sum = 0;
	if(uwTick - uwTick_LED_Speed < 100)	return;
	else		uwTick_LED_Speed = uwTick;
	for(int i = 0;i<8;i++)
	{
		sum += car_postion.idle[i]; 
	}
	if(sum !=8) LED_Disp(0x01);
	else				LED_Disp(0x00);
	sprintf((char *)str,"   NUMBER:%d       ",sum);
	LCD_DisplayStringLine(Line6,str);
}

串口

void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
	sprintf((char *)tx_buff,"uart");
	HAL_UART_Transmit(&huart1,tx_buff,100,0xFF);
//	sscanf((char *)rx_buff,"%4s:%4s",type,id);
//	sprintf((char *)tx_buff,"ID: %4s",id);
//	HAL_UART_Transmit(&huart1,tx_buff,100,0xFF);
	for(i = 0;i<22;i++)
	{	
		car_data[i] = rx_buff[i];
	}
	process_flag = 1;
	HAL_UART_Receive_IT(&huart1,rx_buff,22);
}

逻辑部分,先检查ID，在判断，是否有车位

uint8_t check_car_id()
{
	for( i = 0;i<8;i++)
	{
			if((car_postion.car_id[4*i+0] == id[0])&&(car_postion.car_id[4*i+1] == id[1])
					&&(car_postion.car_id[4*i+2] == id[2])&&(car_postion.car_id[4*i+3] == id[3]))
			{
				sprintf((char *)tx_buff,"i = %d",i);
				HAL_UART_Transmit(&huart1,tx_buff,100,0xFF);
				return i;
			}
	}
	return 30;
}

数据处理

void data_process(uint8_t data)
{
	uint8_t check = check_car_id();
	if(check !=30)
	{
		 
		 sscanf((char *)data,"%4s:%4s:%2d%2d%2d%2d%2d",&car_postion.type[4*check],&car_postion.car_id[4*check],
                                                                                                                                                                                        &car_postion.Start_Year[check],&car_postion.Start_Month[check],
                                                                                                                                                                                        &car_postion.Start_Min[check],&car_postion.Start_Hour[check]);
		 put_price();
		 for(i = 0;i<4;i++)
		 {
	   		car_postion.car_id[4*check+i] = 28;
			  car_postion.type[4*check+i] = 28;
		 }
			car_postion.idle[check] = 0;
//			sprintf((char *)tx_buff,"haaa");
//			HAL_UART_Transmit(&huart1,tx_buff,100,0xFF);
	}
	else								//reach the park
	{
		for(i = 0;i<8;i++)
		{
			sum += car_postion.idle[i]; 
		}
		if(sum !=8)
		{
//				sprintf((char *)tx_buff,"idle = %d",car_postion.idle[0]);
//				HAL_UART_Transmit(&huart1,tx_buff,100,0xFF);
				for(i= 0;i<8;i++)
				{
					if(car_postion.idle[i] == 0)
					{
						car_postion.idle[i] = 1;
						sprintf((char *)str,"  bomm  ");
						LCD_DisplayStringLine(Line9,str);
//						sscanf((char *)data,"%4s:%4s",&car_postion.type[4*i],&car_postion.car_id[4*i]);
						for(j = 0;j<4;j++)
						{
							car_postion.car_id[4*i+j] = rx_buff[5+j];
							
						}
//						sscanf((char *)rx_buff,"%4s:%4s",&car_postion.type[4*i],&car_postion.car_id[4*i]);
						sprintf((char *)str,"      %4s  ",&car_postion.car_id[4*i]);
						LCD_DisplayStringLine(Line8,str);
						LED_Disp(0x55);
						break;
					}
				}
	  }
	}
	process_flag = 0;
}

put_price俺就不写了，具体就是清算费用，然后把对应的idle置0，明天就是国赛了，俺感觉RTC、长短按、局部高亮、EEPROM存取多字节数据，这几个会考，今天看看客观题，睡个好觉，明天希望大家都拿国一。