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蓝桥杯十四届单片机国赛试题及代码_第十四届蓝桥杯单片机国赛

作者：weixin_40725706 | 2024-04-01 23:07:07

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第十四届蓝桥杯单片机国赛

    今年十四届单片机国赛试题在程序题设计方面难度有所下降，但选择题没有了以往可以在手册中可以找到的单片机类选择题，选择题难度较高，因此想获得一个不错的成绩，需要在选择题方面有所加强

试题展示8320c8da8acb4ae780cd9aabd6d58a44.jpg696586bcf93c495a9694e4b41c47d5bb.jpg

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设计说明 

此次国赛采用了温度传感器DS18B20模块，LED模块，按键模块，Pcf8591DAC模块,iic,超声波模块，外设模块不算多，没有13届的定时器分配问题，思路很容易理清。

个人觉得难点在于S8.9两个按键的处理，最好是判断两个同时按下做一个标记在超过两秒后进行初始化功能，因为在松手时不一定能准确控制在10ms内。

矩阵按键模块

  1. #include "bsp_key.h"
  2.  
  3.  
  4.  
  5. unsigned char Key_Read(void)
  6. {
  7. 	unsigned int Key_New;
  8. 	unsigned char Key_Value;
  9. 	
  10. 	P44 = 0;P42 = 1;P35 = 1;P34 = 1;
  11. 	Key_New = P3&0X0F;
  12. 	
  13. 	P44 = 1;P42 = 0;P35 = 1;P34 = 1;
  14. 	Key_New = (Key_New<<4)|(P3&0X0F);
  15. 	
  16. 	P44 = 1;P42 = 1;P35 = 0;P34 = 1;
  17. 	Key_New = (Key_New<<4)|(P3&0X0F);
  18. 	
  19. 	P44 = 1;P42 = 1;P35 = 1;P34 = 0;
  20. 	Key_New = (Key_New<<4)|(P3&0X0F);
  21. 	
  22. 	switch(~Key_New)
  23. 	{
  24. 		case 0x8000:Key_Value = 4;break;
  25. 		case 0x4000:Key_Value = 5;break;
  26. 		case 0x2000:Key_Value = 6;break;
  27. 		case 0x1000:Key_Value = 7;break;
  28. 		
  29. 		case 0x0800:Key_Value = 8;break;
  30. 		case 0x0400:Key_Value = 9;break;
  31. 		case 0x0200:Key_Value = 10;break;
  32. 		case 0x0100:Key_Value = 11;break;
  33. 		
  34. 		case 0x0080:Key_Value = 12;break;
  35. 		case 0x0040:Key_Value = 13;break;
  36. 		case 0x0020:Key_Value = 14;break;
  37. 		case 0x0010:Key_Value = 15;break;
  38. 		
  39. 		case 0x0008:Key_Value = 16;break;
  40. 		case 0x0004:Key_Value = 17;break;
  41. 		case 0x0002:Key_Value = 18;break;
  42. 		case 0x0001:Key_Value = 19;break;
  43. 		
  44. 		case 0x0c00:Key_Value = 89;break;
  45. 		default :Key_Value = 0;
  46. 	}
  47. 	return Key_Value; 
  48. }

数码管显示模块

  1. #include "bsp_seg.h"
  2. void Seg_Tran(unsigned char *seg_string,unsigned char *seg_buf)
  3. {
  4. 	unsigned char i = 0;
  5. 	unsigned char j = 0;
  6. 	unsigned char temp;
  7. 	for(i = 0;i<= 7;i++,j++)
  8. 	{
  9. 		switch(seg_string[j])
  10. 		{
  11. 			case '0':temp = 0xc0;break;
  12. 			case '1':temp = 0xf9;break;
  13. 			case '2':temp = 0xa4;break;
  14. 			case '3':temp = 0xb0;break;
  15. 			case '4':temp = 0x99;break;
  16. 			case '5':temp = 0x92;break;
  17. 			case '6':temp = 0x82;break;
  18. 			case '7':temp = 0xf8;break;
  19. 			case '8':temp = 0x80;break;
  20. 			case '9':temp = 0x90;break;
  21. 			
  22. 			case 'A':temp = 0x88;break;
  23. 			case 'B':temp = 0x83;break;
  24. 			case 'C':temp = 0xc6;break;
  25. 			case 'D':temp = 0xa1;break;
  26. 			case 'E':temp = 0x86;break;
  27. 			case 'F':temp = 0x8e;break;
  28. 			case ' ':temp = 0xff;break;
  29. 			case '-':temp = 0xbf;break;
  30. 			
  31. 			case 'H':temp = 0x89;break;			
  32. 			case 'L':temp = 0xc7;break;
  33. 			case 'N':temp = 0xc8;break;			
  34. 			case 'P':temp = 0x8c;break;
  35. 			case 'U':temp = 0xc1;break;
  36. 			
  37. 			default:temp = 0xff;break;
  38. 		}
  39. 		if(seg_string[j+1] == '.')
  40. 		{
  41. 			temp &= 0x7f;
  42. 			j++;
  43. 		}
  44. 		seg_buf[i] = temp;
  45. 	}
  46. }
  47.  
  48. void Seg_Disp(unsigned char *seg_buf,unsigned char pos)
  49. {
  50. 	P0 = 0XFF;
  51. 	P2 = P2 & 0X1F |0XE0;
  52. 	P2 &= 0X1F;
  53. 	
  54. 	P0 = 1<<pos;
  55. 	P2 = P2 & 0X1F |0Xc0;
  56. 	P2 &= 0X1F;
  57. 	
  58. 	P0 = seg_buf[pos];
  59. 	P2 = P2 & 0X1F |0XE0;
  60. 	P2 &= 0X1F;
  61. }

DS18B20模块

  1. unsigned int rd_temperature(void)
  2. {
  3. 	unsigned char low,high;
  4. 	
  5. 	init_ds18b20();
  6. 	Write_DS18B20(0xcc);//跳过rom只有一个温度传感器
  7. 	Write_DS18B20(0x44);//转换温度
  8. 	
  9. 	init_ds18b20();
  10. 	Write_DS18B20(0xcc);
  11. 	Write_DS18B20(0xbe); //将温度依次返回
  12. 	
  13. 	low = Read_DS18B20();//先读低温度
  14. 	high = Read_DS18B20();//先读低温度
  15. 	
  16. 	return((high<<8)|low);
  17. }

超声波模块

  1. #include "bsp_ultrasonic.h"
  2.  
  3. sbit TX = P1^0;
  4. sbit RX = P1^1;
  5.  
  6. void ultrasonic_Timer0init(void)
  7. {
  8. 	AUXR &= 0x7F;		//定时器时钟12T模式
  9. 	TMOD &= 0xF0;		//设置定时器模式
  10. 	TL0 = 0xF4;		//设置定时初值
  11. 	TH0 = 0xFF;		//设置定时初值
  12. 	TF0 = 0;		//清除TF0标志
  13. 	TR0 = 0;		//定时器0不开始计时
  14. }
  15.  
  16.  
  17. unsigned char ultrasonic_rec(void)
  18. {
  19. 	unsigned char num = 10;//与定时器12mhz形成40hz的超声波
  20. 	unsigned char Distance;
  21. 	
  22. 	TX = 0;
  23. 	TL0 = 0xF4;		//设置定时初值
  24. 	TH0 = 0xFF;		//设置定时初值
  25. 	
  26. 	TR0 = 1;
  27. 	while(num--)
  28. 	{
  29. 		while(!TF0);
  30. 		TX ^= 1;
  31. 		TF0 = 0;
  32. 	}		
  33. 	
  34. 	TR0 = 0;
  35. 	TL0 = 0;		//此时装0时将定时称0.017换算距离
  36. 	TH0 = 0;		//设置定时初值
  37. 	TR0 = 1;
  38. 	
  39. 	while(RX && (~TF0));//RX平时为1变0是接收到40hz脉冲
  40. 	TR0 = 0;
  41. 	if(TF0 == 1)//距离溢出
  42. 	{
  43. 		Distance = 255;
  44. 		TF0 = 0;
  45. 	}
  46. 	else 
  47. 	{
  48. 		Distance = (((TH0<<8)|TL0)*0.017);
  49. 		TF0 = 0;
  50. 	}
  51. 	return Distance;
  52. }
  53.

显示定时器模块

  1. #include "Timer.h"
  2.  
  3. void Timer1Init(void)		//1毫秒@12.000MHz
  4. {
  5. 	AUXR &= 0xBF;		//定时器时钟12T模式
  6. 	TMOD &= 0x0F;		//设置定时器模式
  7. 	TL1 = 0x18;		//设置定时初值
  8. 	TH1 = 0xFC;		//设置定时初值
  9. 	TF1 = 0;		//清除TF1标志
  10. 	TR1 = 1;		//定时器1开始计时
  11. 	
  12. 	ET1 = 1;
  13. }

LED及继电器模块

  1. #include "bsp_led.h"
  2.  
  3. void Led_Disp(unsigned char ucLed)
  4. {
  5. 	P0 = (~ucLed);
  6. 	P2 = P2 & 0X1F |0X80;
  7. 	P2 &= 0X1F;
  8. }
  9.  
  10.  
  11.  
  12. void Relay(unsigned char relay)
  13. {
  14. 	P0 = relay;
  15. 	P2 = P2 & 0X1F |0Xa0;
  16. 	P2 &= 0X1F;
  17. }

DAC模块

  1. #include "bsp_iic.h"
  2.  
  3. #define DELAY_TIME 5
  4. sbit SDA = P2^1;
  5. sbit SCL = P2^0;
  6.  
  7. //
  8. void IIC_Delay(unsigned char i)
  9. {
  10.     do{_nop_();}
  11.     while(i--);        
  12. }
  13.  
  14. //
  15. void IIC_Start(void)
  16. {
  17.     SDA = 1;
  18.     SCL = 1;
  19.     IIC_Delay(DELAY_TIME);
  20.     SDA = 0;
  21.     IIC_Delay(DELAY_TIME);
  22.     SCL = 0;	
  23. }
  24.  
  25. //
  26. void IIC_Stop(void)
  27. {
  28.     SDA = 0;
  29.     SCL = 1;
  30.     IIC_Delay(DELAY_TIME);
  31.     SDA = 1;
  32.     IIC_Delay(DELAY_TIME);
  33. }
  34.  
  35. //
  36. void IIC_SendAck(bit ackbit)
  37. {
  38.     SCL = 0;
  39.     SDA = ackbit;  					
  40.     IIC_Delay(DELAY_TIME);
  41.     SCL = 1;
  42.     IIC_Delay(DELAY_TIME);
  43.     SCL = 0; 
  44.     SDA = 1;
  45.     IIC_Delay(DELAY_TIME);
  46. }
  47.  
  48. //
  49. bit IIC_WaitAck(void)
  50. {
  51.     bit ackbit;
  52. 	
  53.     SCL  = 1;
  54.     IIC_Delay(DELAY_TIME);
  55.     ackbit = SDA;
  56.     SCL = 0;
  57.     IIC_Delay(DELAY_TIME);
  58.     return ackbit;
  59. }
  60.  
  61. //
  62. void IIC_SendByte(unsigned char byt)
  63. {
  64.     unsigned char i;
  65.  
  66.     for(i=0; i<8; i++)
  67.     {
  68.         SCL  = 0;
  69.         IIC_Delay(DELAY_TIME);
  70.         if(byt & 0x80) SDA  = 1;
  71.         else SDA  = 0;
  72.         IIC_Delay(DELAY_TIME);
  73.         SCL = 1;
  74.         byt <<= 1;
  75.         IIC_Delay(DELAY_TIME);
  76.     }
  77.     SCL  = 0;  
  78. }
  79.  
  80. //
  81. unsigned char IIC_RecByte(void)
  82. {
  83.     unsigned char i, da;
  84.     for(i=0; i<8; i++)
  85.     {   
  86.     	SCL = 1;
  87. 		IIC_Delay(DELAY_TIME);
  88. 		da <<= 1;
  89. 		if(SDA) da |= 1;
  90. 		SCL = 0;
  91. 		IIC_Delay(DELAY_TIME);
  92.     }
  93.     return da;    
  94. }
  95.  
  96.  
  97.  
  98. void Pcf8591_DAC(float Dac_data)
  99. {
  100. 	IIC_Start();
  101. 	IIC_SendByte(0x90);//选择选择pcf8591写东西模式
  102. 	IIC_WaitAck();
  103. 	
  104. 	IIC_SendByte(0x41);//选择写0x41通道
  105. 	IIC_WaitAck();
  106. 	
  107. 	IIC_SendByte(Dac_data);//发送写的内容
  108. 	IIC_WaitAck();
  109. 	IIC_Stop();//停止对iic的控制
  110. }

初始化

  1. #include "bsp_init.h"
  2.  
  3.  
  4.  
  5. void Clc_Peripheral(void)
  6. {
  7. 	P0 = 0XFF;
  8. 	P2 = P2 & 0X1F |0X80;
  9. 	P2 &= 0X1F;
  10. 	
  11. 	P0 = 0X00;
  12. 	P2 = P2 & 0X1F |0XA0;
  13. 	P2 &= 0X1F;
  14. }

主函数

  1. #include "STC15F2K60S2.H"
  2. #include "bsp_init.h"
  3. #include "Timer.h"
  4. #include "bsp_led.h"
  5. #include "bsp_key.h"
  6. #include "bsp_seg.h"
  7. #include "stdio.h"
  8. #include "bsp_onewire.h"
  9. #include "bsp_iic.h"
  10. #include "bsp_ultrasonic.h"
  11.  
  12. //程序减速
  13. unsigned int Seg_Slow_Down = 0;
  14. unsigned int Key_Slow_Down = 0;
  15. unsigned int Led_Slow_Down = 0;
  16.  
  17. ///三大服务模块
  18. void Key_Proc(void);
  19. void Seg_Proc(void);
  20. void Led_Proc(void);
  21.  
  22. void Delay500ms()		//@12.000MHz
  23. {
  24. 	unsigned char i, j, k;
  25.  
  26. 	_nop_();
  27. 	_nop_();
  28. 	i = 23;
  29. 	j = 205;
  30. 	k = 120;
  31. 	do
  32. 	{
  33. 		do
  34. 		{
  35. 			while (--k);
  36. 		} while (--j);
  37. 	} while (--i);
  38. }
  39.  
  40.  
  41.  
  42. //按键
  43. unsigned char Key_Value,Key_Down,Key_Old,Key_Up;
  44.  
  45. //数码管
  46. unsigned char seg_string[10];
  47. unsigned char seg_buf[8] = {0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff};
  48. unsigned char pos;
  49.  
  50. //LED
  51. unsigned char ucLed;																				
  52.  
  53. //其他变量
  54. float Temperature;//测得的距离
  55. float Distance;//测得的距离
  56. float Distance_Disp;//调整后的距离
  57. bit Distance_M__CM_flag = 0;//CM和M标志 0为初始CM
  58.  
  59. unsigned char Inter_Face = 0x11;//界面标号 0x11测距界面 0x21参数界面-距离参数 0x22参数界面-温度参数 0x31校准值界面 0x32介质传输速度界面 0x33DAC下限界面
  60. unsigned long ms_Tick = 0;
  61. unsigned long Key_ms_Tick = 0;
  62. unsigned long xdata Data_record_ms_Tick = 0;
  63. unsigned char Distance_DAC;
  64. unsigned char Distance_Canshu = 40;//距离参数
  65. unsigned char Temperature_Canshu = 30;//温度参数
  66. int Distance_calibration = 0;//校准值
  67. unsigned int xdata Ultrasonic_medium = 340;//介质传播速度
  68. float DAC_Low_Vlaue = 1.0;//DAC下限
  69. bit Key_89_2s_flag = 0;
  70. bit Data_record = 0;
  71. bit DAC_flag = 0;
  72. float DAC_Data;
  73. void main(void)
  74. {
  75. 	Clc_Peripheral();
  76. 	Timer1Init();
  77. 	rd_temperature();
  78. 	Delay500ms();
  79. 	EA = 1;
  80.  
  81. 	ultrasonic_Timer0init();
  82. 	
  83. 	while(1)
  84. 	{
  85. 		Key_Proc();
  86. 		Seg_Proc();
  87. 		Led_Proc();
  88.  
  89. 	}
  90. }
  91. void tm1_isr() interrupt 3
  92. {
  93. 	ms_Tick++;
  94. 	if(++Key_Slow_Down == 10)Key_Slow_Down = 0;
  95. 	if(++Seg_Slow_Down == 70)Seg_Slow_Down = 0;
  96. 	if(++Led_Slow_Down == 100)Led_Slow_Down = 0;
  97. 	
  98. 	else if(((Inter_Face >> 4) ==  0x03)&&(ms_Tick % 100) == 0)
  99. 	{
  100. 		ucLed &= 0x7f;
  101. 		ucLed ^= 0x01;
  102. 	}
  103. 	
  104. 	Led_Disp(ucLed);
  105. 	Seg_Disp(seg_buf,pos);
  106. 	if(++pos == 8)pos = 0;
  107. }
  108. void Key_Proc(void)
  109. {
  110. 	if(Key_Slow_Down) return;
  111. 	Key_Slow_Down = 1;
  112. 	
  113. 	
  114. 	Key_Value = Key_Read();
  115. 	Key_Down = Key_Value & (Key_Old ^ Key_Value);//按键按下
  116. 	Key_Up = ~Key_Value & (Key_Old ^ Key_Value);//按键弹起
  117. 	Key_Old = Key_Value;
  118. 	
  119. 	if(Key_Down)
  120. 	{
  121. 		if(Key_Down == 89)Key_89_2s_flag = 1;
  122. 		Key_ms_Tick =  ms_Tick;
  123. 	}
  124. 	if(((ms_Tick - Key_ms_Tick) <= 2000)&&(Data_record == 0))//短按 按下2s内
  125. 	{
  126. 		switch(Key_Up)
  127. 		{
  128. 			case 4:
  129. 				if((Inter_Face >> 4) == 0x01) Inter_Face = 0x21;
  130. 				else if((Inter_Face >> 4) == 0x02) Inter_Face = 0x31;
  131. 				else if((Inter_Face >> 4) == 0x03) Inter_Face = 0x11;
  132. 				break;
  133. 			case 5:
  134. 				if(Inter_Face == 0x11)Distance_M__CM_flag ^= 1;
  135. 				else if(Inter_Face == 0x21)Inter_Face = 0x22;
  136. 				else if(Inter_Face == 0x22)Inter_Face = 0x21;
  137. 				else if(Inter_Face == 0x31)Inter_Face = 0x32;
  138. 				else if(Inter_Face == 0x32)Inter_Face = 0x33;
  139. 				else if(Inter_Face == 0x33)Inter_Face = 0x31;
  140. 				break;
  141. 			case 8://按键++判断 以及记录功能
  142. 				if(Inter_Face == 0x11)
  143. 				{
  144. 					Data_record = 1;
  145. 					Data_record_ms_Tick = ms_Tick;
  146. 				}
  147. 				else if(Inter_Face == 0x21)
  148. 				{
  149. 					Distance_Canshu += 10;
  150. 					if(Distance_Canshu == 100)Distance_Canshu = 90;
  151. 				}
  152. 				else if(Inter_Face == 0x22)
  153. 				{
  154. 					Temperature_Canshu += 1;
  155. 					if(Temperature_Canshu == 81)Temperature_Canshu = 80;
  156. 				}
  157. 				else if(Inter_Face == 0x31)
  158. 				{
  159. 					Distance_calibration += 5;
  160. 					if(Distance_calibration == 95)Distance_calibration = 90;
  161. 				}
  162. 				else if(Inter_Face == 0x32)
  163. 				{
  164. 					Ultrasonic_medium += 10;
  165. 					if(Ultrasonic_medium == 10000)Ultrasonic_medium = 9990;
  166. 				}
  167. 				else if(Inter_Face == 0x33)
  168. 				{
  169. 					DAC_Low_Vlaue += 0.1;
  170. 					if(DAC_Low_Vlaue >= 2.0)DAC_Low_Vlaue = 2.0;
  171. 				}
  172. 				break;
  173. 			case 9://按键--判断 以及DAC输出功能
  174. 				if(Inter_Face == 0x11)DAC_flag = 1;
  175. 				else if(Inter_Face == 0x21)
  176. 				{
  177. 					Distance_Canshu -= 10;
  178. 					if(Distance_Canshu == 0)Distance_Canshu = 10;
  179. 				}
  180. 				else if(Inter_Face == 0x22)
  181. 				{
  182. 					Temperature_Canshu -= 1;
  183. 					if(Temperature_Canshu == 255)Temperature_Canshu = 0;
  184. 				}
  185. 				else if(Inter_Face == 0x31)
  186. 				{
  187. 					Distance_calibration -= 5;
  188. 					if(Distance_calibration == -95)Distance_calibration = -90;
  189. 				}
  190. 				else if(Inter_Face == 0x32)
  191. 				{
  192. 					Ultrasonic_medium -= 10;
  193. 					if(Ultrasonic_medium == 0)Ultrasonic_medium = 10;
  194. 				}
  195. 				else if(Inter_Face == 0x33)
  196. 				{
  197. 					DAC_Low_Vlaue -= 0.1;
  198. 					if(DAC_Low_Vlaue <= 0.1)DAC_Low_Vlaue = 0.1;
  199. 				}
  200. 				break;
  201. 		}
  202. 	}
  203. 	else if(((ms_Tick - Key_ms_Tick) > 2000)&&(Key_89_2s_flag == 1))//长按判断标志是否为1
  204. 	{
  205. 		ucLed ^=0xff;
  206. 		Key_89_2s_flag = 0;
  207. 		Distance_M__CM_flag = 0;
  208. 		Distance_Canshu = 40;
  209. 		Temperature_Canshu = 30;
  210. 		Distance_calibration = 0;
  211. 		Ultrasonic_medium = 340;
  212. 		DAC_Low_Vlaue = 1.0;
  213. 	}
  214. 	if((Data_record == 1)&&((ms_Tick - Data_record_ms_Tick) < 6000))
  215. 	{
  216. 		if((ms_Tick%1000) == 0)Distance_DAC = ultrasonic_rec();
  217. 	}
  218. 	else if((Data_record == 1)&&((ms_Tick - Data_record_ms_Tick) > 6000))Data_record = 0;
  219. 	
  220. }
  221.  
  222. void Seg_Proc(void)
  223. {
  224. 	if(Seg_Slow_Down) return;
  225. 	Seg_Slow_Down = 1;
  226. 	
  227. 	Temperature = (rd_temperature()/16.0);
  228. 	Distance = ultrasonic_rec();
  229. 	Distance_Disp = ((Ultrasonic_medium/340.0)*Distance+Distance_calibration);//将标准环境下的速度进行调整和校准
  230. 	
  231. 	//*****DAC输出*****
  232. 	if(Distance_Disp >= 90)DAC_Data = 255;
  233. 	else if(Distance_Disp <= 10)DAC_Data = 51;
  234. 	else if((Distance_Disp > 10)&&(Distance_Disp < 90))DAC_Data = 51*(((5-DAC_Low_Vlaue)/80.0)*Distance_Disp+(DAC_Low_Vlaue - ((5-DAC_Low_Vlaue)/8.0)));
  235. 	
  236. 	if(DAC_flag == 1)Pcf8591_DAC(DAC_Data);
  237. 	//****************
  238. 	switch(Inter_Face)
  239. 	{
  240. 		case 0x11:
  241. 			if(Distance_M__CM_flag == 0)sprintf(seg_string,"%03.1f-%4d",Temperature,(unsigned int)Distance_Disp);	//cm
  242. 			else if(Distance_M__CM_flag == 1)sprintf(seg_string,"%03.1f-%4.2f",Temperature,(Distance_Disp/100.0));	//m
  243. 			break;
  244. 		case 0x21:
  245. 			sprintf(seg_string,"P1    %02d",(unsigned int)Distance_Canshu);//距离参数界面
  246. 			break;
  247. 		case 0x22:
  248. 			sprintf(seg_string,"P2    %02d",(unsigned int)Temperature_Canshu);//温度参数界面
  249. 			break;
  250. 		case 0x31:
  251. 			sprintf(seg_string,"F1   %3d",Distance_calibration);//距离校准界面
  252. 			break;
  253. 		case 0x32:
  254. 			sprintf(seg_string,"F2  %4d",Ultrasonic_medium);//介质速度界面
  255. 			break;
  256. 		case 0x33:
  257. 			sprintf(seg_string,"F2    %2.1f",DAC_Low_Vlaue);//dac下限界面
  258. 			break;
  259. 			
  260. 	}
  261. 	
  262. 	Seg_Tran(seg_string,seg_buf);
  263. }
  264.  
  265. void Led_Proc(void)//Led 和继电器
  266. {
  267. 	if(Led_Slow_Down) return;
  268. 	Led_Slow_Down = 1;
  269. 	if(Inter_Face == 0x11)
  270. 	{
  271. 		if(Distance_Disp > 255)ucLed = 0xff;
  272. 		else if(Distance_Disp < 255)
  273. 		{
  274. 			ucLed = Distance_Disp;
  275. 		}
  276. 	}
  277. 	else if((Inter_Face >> 4) ==  0x02)//L8
  278. 	{
  279. 		ucLed &= 0x0;
  280. 		ucLed |= 0x80;
  281. 	}
  282. 	//继电器
  283. 	if((Distance_Disp < (Distance_Canshu+5))&&(Distance_Disp > (Distance_Canshu -5))&&(Temperature <= Temperature_Canshu))Relay(0x10);//L10
  284. 	else Relay(0x0);
  285.  
  286. }
  287.  
  288.

功能演示

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