蓝桥杯嵌入式第十一届省赛模拟试题

Grace ·

更新时间:2024-09-20

· 725 次阅读

一、问题

在这里插入图片描述

二、解答：

1.初始化相关
tx.c

#include "tx.h"
void LED_Init(void){
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD, ENABLE);
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOD, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = 0xff00;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  GPIOD->ODR|=(1<ODR|=0xff00;
  GPIOD->ODR&=~(1<<2);
}
void KEY_Init(void){
  GPIO_InitTypeDef   GPIO_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOB, ENABLE);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_8;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOB, &GPIO_InitStructure);
}
u8 key_status[4]={1,1,1,1};
u16 key_downtime[4]={0,0,0,0};
void KEY_Driver(void){
  u8 i;
  static u8 backup[4]={1,1,1,1};
  static u16 timethr[4]={1000,1000,1000,1000};
  for(i=0;i0) {
	  if(key_downtime[i]>timethr[i]){
	  	 Key_action(i+1,1);
		 timethr[i]+=200;
	  }
	  else
	    timethr[i]=1000;	 	
	} 
  }	 
}
void KEY_Scan(void){
  u8 i;
  static u8 key_buf[4]={0xff,0xff,0xff,0xff};
  key_buf[0]=(key_buf[0]<<1)|KEY1;
  key_buf[1]=(key_buf[1]<<1)|KEY2; 
  key_buf[2]=(key_buf[2]<<1)|KEY3; 
  key_buf[3]=(key_buf[3]<<1)|KEY4;
  for(i=0;i<4;i++){
    if(key_buf[i]==0x00) {
	  key_downtime[i]+=4; 
	  key_status[i]=0;
	}
	else if(key_buf[i]==0xff){
	  key_downtime[i]=0;
	  key_status[i]=1;
	}  	  
  }
}
void Tim4_Init(u16 arr,u16 psc){
  TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
  NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;	 
  NVIC_Init(&NVIC_InitStructure);
  TIM_TimeBaseStructure.TIM_Period = arr-1;
  TIM_TimeBaseStructure.TIM_Prescaler = psc-1;
  TIM_TimeBaseStructure.TIM_ClockDivision = 0;
  TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
  TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
  TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
  /* TIM2 enable counter */
  TIM_Cmd(TIM4, ENABLE);
}
void RTC_Init(u8 HH,u8 MM,u8 SS){
  NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
  NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);
  /* Allow access to BKP Domain */
  PWR_BackupAccessCmd(ENABLE);
  /* Reset Backup Domain */
  BKP_DeInit();
  /* Enable the LSI OSC */
  RCC_LSICmd(ENABLE);
  /* Wait till LSI is ready */
  while (RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET)
  {}
  /* Select the RTC Clock Source */
  RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
  /* Enable RTC Clock */
  RCC_RTCCLKCmd(ENABLE);
  /* Wait for RTC registers synchronization */
  RTC_WaitForSynchro();
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  /* Enable the RTC Second */
  RTC_ITConfig(RTC_IT_SEC, ENABLE);
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  /* Set RTC prescaler: set RTC period to 1sec */
  RTC_SetPrescaler(40000-1);
  /* Wait until last write operation on RTC registers has finished */
  RTC_WaitForLastTask();
  RTC_SetCounter(3600*HH+60*MM+SS);
  RTC_WaitForLastTask();	  
}
void Usart2_Init(void){
  USART_InitTypeDef USART_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;
  NVIC_InitTypeDef NVIC_InitStructure;
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); 
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
  NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
  USART_InitStructure.USART_BaudRate = 9600;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  /* Configure USARTy */
  USART_Init(USART2, &USART_InitStructure);
  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
  USART_Cmd(USART2, ENABLE);
}
void Send_string(u8 *str){
  u8 i=0;
  while(str[i]!=0){
  	 USART_SendData(USART2,str[i]);
	 while(USART_GetFlagStatus(USART2,USART_FLAG_TXE)==0);
	 i++;  
  }	
}

tx.h

/*
  程序说明: CT117E嵌入式竞赛板LCD驱动程序
  软件环境: Keil uVision 4.10 
  硬件环境: CT117E嵌入式竞赛板
  日    期: 2011-8-9
*/
/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __TX_H
#define __TX_H
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#define KEY1 GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)
#define KEY2 GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_8)
#define KEY3 GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1)
#define KEY4 GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_2)
void LED_Init(void);
void KEY_Init(void);
void KEY_Driver(void);
void KEY_Scan(void);
void Tim4_Init(u16 arr,u16 psc);
void RTC_Init(u8 HH,u8 MM,u8 SS);
void Usart2_Init(void);
void Send_string(u8 *str);
extern void Key_action(int code,int sta);
#endif /* __TX_H */
/******************* (C) COPYRIGHT 2008 STMicroelectronics *****END OF FILE****/

2.i2c.c中增加

void i2c_write(u16 add,u8 data){
  I2CStart();
  I2CSendByte(0xa0);
  I2CWaitAck();
  I2CSendByte(add);
  I2CWaitAck();
  I2CSendByte(data);
  I2CWaitAck();
  I2CStop();
}
u8 i2c_read(u16 add){
  u8 temp;
  I2CStart();
  I2CSendByte(0xa0);
  I2CWaitAck();
  I2CSendByte(add);
  I2CWaitAck();
  I2CStart();
  I2CSendByte(0xa1);
  I2CWaitAck();
  temp=I2CReceiveByte();
  I2CSendAck();
  I2CStop();
  return temp;
}

3.主文件中：

#include "stm32f10x.h"
#include "lcd.h"
#include "tx.h"
#include "stdio.h"
#include "i2c.h"
u32 TimingDelay = 0;
u8 RXD_flag=0;
u8 RXD_buf[20];
u8 str[20];
u8 i;
u16 time;
u8 hour,min,sec;
u8 t_hour=11,t_min=59,t_sec=50;//设置初始时间
u8 a_hour=12,a_min=0,a_sec=0;//设置闹钟
u8 time_flag=0;//在设置时间时的切换标志
u8 alarm_flag=0;//在设置闹钟时的切换标志
u8 SET_flag=0;//0时钟显示，1时钟设置，2报警设置
u8 KEY1_flag=0; //0是时钟设置，1是切换
u8 KEY2_flag=0;	//0是闹钟设置，1是切换
u16 time_count=0;	//时间设置次数
u16 alarm_count=0;	 //报警次数
u8 ms200_flag=1;
u16 LED_MODE=0xffff;
u16 led1_cnt=0;
void Show_real_data(void);
void Show_set_time(void);
void Show_set_alarm(void);
void Led_action(void);
void Usart_action(int i);
void Key_action(int code,int sta);
void In_data(void);
void De_data(void);		
void Delay_Ms(u32 nTime);
//Main Body
int main(void)
{
	SysTick_Config(SystemCoreClock/1000);
	Delay_Ms(200);
	STM3210B_LCD_Init();
	LCD_Clear(Blue);
	LCD_SetBackColor(Blue);
	LCD_SetTextColor(White);
    i2c_init();
	LED_Init();
	KEY_Init();
	Tim4_Init(2000,72);
	RTC_Init(11,59,50);
	Usart2_Init();
	time_count=0;
    alarm_count=0;
	time_count=i2c_read(0x00); Delay_Ms(5);
    alarm_count=i2c_read(0x01); Delay_Ms(5);
	a_hour=i2c_read(0x02); Delay_Ms(5);
	a_min=i2c_read(0x03); Delay_Ms(5);
	a_sec=i2c_read(0x04); Delay_Ms(5);
	while(1){
	  KEY_Driver();
	  if(ms200_flag){
	  	ms200_flag=0;
	  	Led_action();
		if(SET_flag==0)
		  Show_real_data();
		else if(SET_flag==1)
		  Show_set_time();
		else if(SET_flag==2)
		  Show_set_alarm();		
	  }
   } 	
}
void Show_real_data(void){
  sprintf((char*)str,"       MAIN     ");
  LCD_DisplayStringLine(Line2, str);
  sprintf((char*)str,"   RTC:");
  LCD_DisplayStringLine(Line5, str);
  LCD_DisplayChar(Line5, 200,hour/10+'0');
  LCD_DisplayChar(Line5, 185,hour%10+'0');
  LCD_DisplayChar(Line5, 170,':');	
  LCD_DisplayChar(Line5, 155,min/10+'0');
  LCD_DisplayChar(Line5, 140,min%10+'0');
  LCD_DisplayChar(Line5, 125,':');
  LCD_DisplayChar(Line5, 110,sec/10+'0');
  LCD_DisplayChar(Line5, 95,sec%10+'0');	
}
void Show_set_time(void){
  sprintf((char*)str,"    RTC-SETTING   ");
  LCD_DisplayStringLine(Line2, str);
  sprintf((char*)str,"   RTC:");
  LCD_DisplayStringLine(Line5, str);
  if(time_flag==0)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 200,t_hour/10+'0');
  LCD_DisplayChar(Line5, 185,t_hour%10+'0');
  LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 170,':');	   
  if(time_flag==1)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 155,t_min/10+'0');
  LCD_DisplayChar(Line5, 140,t_min%10+'0');
  LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 125,':');	  
  if(time_flag==2)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 110,t_sec/10+'0');
  LCD_DisplayChar(Line5, 95,t_sec%10+'0');
  LCD_SetTextColor(White);
}
void Show_set_alarm(void){
  sprintf((char*)str,"   ALARM-SETTING   ");
  LCD_DisplayStringLine(Line2, str);
  sprintf((char*)str," ALARM:");
  LCD_DisplayStringLine(Line5, str);
  if(alarm_flag==0)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 200,a_hour/10+'0');
  LCD_DisplayChar(Line5, 185,a_hour%10+'0');
  LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 170,':');	   
  if(alarm_flag==1)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 155,a_min/10+'0');
  LCD_DisplayChar(Line5, 140,a_min%10+'0');
  LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 125,':');	  
  if(alarm_flag==2)
    LCD_SetTextColor(Green);
  else 
    LCD_SetTextColor(White);
  LCD_DisplayChar(Line5, 110,a_sec/10+'0');
  LCD_DisplayChar(Line5, 95,a_sec%10+'0');
  LCD_SetTextColor(White);
}
void Led_action(void){   
  if(SET_flag==0){
  	 led1_cnt++;
	 if(led1_cnt>=10){
	   LED_MODE^=(1<ODR=LED_MODE;
	   GPIO_SetBits(GPIOC,GPIO_Pin_9);
	   GPIO_SetBits(GPIOC,GPIO_Pin_10);
	   GPIOD->ODR|=(1<ODR&=~(1<<2);
	   led1_cnt=0;  
	 }	 
  }   
  else if(SET_flag==1){	    	 
	 LED_MODE&=~(1<ODR=LED_MODE;
	 GPIO_SetBits(GPIOC,GPIO_Pin_8);
	 GPIO_SetBits(GPIOC,GPIO_Pin_10);
	 GPIOD->ODR|=(1<ODR&=~(1<<2);
  } 
  else if(SET_flag==2){	
	 LED_MODE&=~(1<ODR=LED_MODE;
	 GPIO_SetBits(GPIOC,GPIO_Pin_9);
	 GPIO_SetBits(GPIOC,GPIO_Pin_8);
	 GPIOD->ODR|=(1<ODR&=~(1<<2);
  }  
}
void Usart_action(int i){
  if(i==1){
  	sprintf((char*)str,"New RTC:%.2d:%.2d:%.2d\r\n",t_hour,t_min,t_sec);
    Send_string(str);
  }
  else if(i==2){
  	sprintf((char*)str,"New Alarm:%.2d:%.2d:%.2d\r\n",a_hour,a_min,a_sec);
    Send_string(str);
  }
  for(i=0;i2)
	    alarm_flag=0;	  	
	}	
  }
  else if(code==2){
  	if(KEY2_flag==0){	//设置
	   if(SET_flag==0)
	    SET_flag=2;
	   else if(SET_flag==2)
	    SET_flag=0;
	   KEY1_flag=1;
	   if(SET_flag==0){
	     alarm_count++;
		 i2c_write(0x01,alarm_count);Delay_Ms(5);
		 i2c_write(0x02,a_hour);Delay_Ms(5);
	     i2c_write(0x03,a_min);Delay_Ms(5);
	     i2c_write(0x04,a_sec);Delay_Ms(5);
		 //if(RXD_flag){
		 //  RXD_flag=0; 
		   Usart_action(2);
		 //}
		 KEY1_flag=0;
	   }	 	  
	}
	else if(KEY2_flag==1){	//切换闹钟选择
	  time_flag++;
	  if(time_flag>2)
	    time_flag=0;	  	
	}  	   
  }
  }
  else if(sta==1){
   if(code==3)	    
	  In_data();   
  else if(code==4)	   
	  De_data();   
  }
}
void In_data(void){
  if(SET_flag==1){
  	if(time_flag==0){
	  t_hour+=1;
	  if(t_hour>=24)
	    t_hour=0;
	}
	else if(time_flag==1){
	  t_min+=1;
	  if(t_min>=60)
	    t_min=0;	
	}
	else if(time_flag==2){
	  t_sec+=1;
	  if(t_sec>=60)
	    t_sec=0;	
	}
  }
  else if(SET_flag==2){
  	if(alarm_flag==0){
	  a_hour+=1;
	  if(a_hour>=24)
	    a_hour=0;
	}
	else if(alarm_flag==1){
	  a_min+=1;
	  if(a_min>=60)
	    a_min=0;	
	}
	else if(alarm_flag==2){
	  a_sec+=1;
	  if(a_sec>=60)
	    a_sec=0;	
	}
  }
}
void De_data(){
  if(SET_flag==1){
  	if(time_flag==0){
	  t_hour--;
	  if(t_hour+1<=0)
	    t_hour=23;
	}
	else if(time_flag==1){
	  t_min--;
	  if(t_min+1<=0)
	    t_min=59;	
	}
	else if(time_flag==2){
	  t_sec--;
	  if(t_sec+1<=0)
	    t_sec=0;	
	}
  }
  else if(SET_flag==2){
  	if(alarm_flag==0){
	  a_hour--;
	  if(a_hour+1<=0)
	    a_hour=23;
	}
	else if(alarm_flag==1){
	  a_min--;
	  if(a_min+1<=0)
	    a_min=59;	
	}
	else if(alarm_flag==2){
	  a_sec--;
	  if(a_sec+1<=60)
	    a_sec=59;	
	}
  }
}
void Delay_Ms(u32 nTime)
{
	TimingDelay = nTime;
	while(TimingDelay != 0);	
}

4.中断
stm32f10x_it.c中

void SysTick_Handler(void)
{
	TimingDelay--;
}
extern u8 ms200_flag;
void TIM4_IRQHandler(void)
{
  static u16 ms200_count=0;
  if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
  {
    TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
	ms200_count++;
	KEY_Scan();
	if(ms200_count>=100){
	  ms200_count=0;
	  ms200_flag=1;	 
	}
  }
}
extern u16 time;
extern u8 hour,min,sec;
void RTC_IRQHandler(void)
{
  if (RTC_GetITStatus(RTC_IT_SEC) != RESET)
  {
    RTC_ClearITPendingBit(RTC_FLAG_SEC);
    time=RTC_GetCounter();
	if(time==23*3600+59*60+59){
	   RTC_SetCounter(0);
	}
	hour=time/3600;
	min=time%3600/60;
	sec=time%3600%60;
  }
}
extern u8 RXD_flag;
extern u8 RXD_buf[20];
u8 RXD_count=0;
void USART2_IRQHandler(void)
{
  u16 temp;
  if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET){
    USART_ClearITPendingBit(USART2, USART_IT_RXNE);
	temp=USART_ReceiveData(USART2);
	if(temp=='\n'){
	   RXD_flag=1; 
	   RXD_count=0;
	   USART_ITConfig(USART2, USART_IT_RXNE, DISABLE);
	}
    else 
	  RXD_buf[RXD_count++]=temp;
  }
}

三、总结：
1.功能得到实现，但长短按键效果不是很好。长按的时候增加的太快了，不是每个数都显示。其他的都还好。
2.前期自己做的时候，参考了别人的程序，分成小函数来写，然后调用。思路比较清晰。

四、遇到的问题：
1.三个灯的控制，开一个灯，另外两个灯的状态也需要变，只用位操作会出现问题，试了挺长时间，用了位操作+函数直接置位实现了。
2.串口发送的时候，如果加上串口发送标志的判断，就不一定能显示。去掉之后可以显示。
3.lcd高亮显示，要按字符来操作，因此字符的位置需要确定好。而且界面切换时，可能会显示之前界面的字符。我的方法是这些位置都替换掉，就不会串位了。

作者：fancyZT

蓝桥杯嵌入嵌入式

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