蓝桥杯单片机-国赛6——第13届国赛主观题

2024-05-27 23:36
文章标签 蓝桥 单片机 13 国赛 主观题 届国赛

本文主要是介绍蓝桥杯单片机-国赛6——第13届国赛主观题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

0.比赛真题

1. 编程心得

  • DAC输出需要放到while循环里，一直持续的输出才能检测到稳定电压
  • 涉及锁存器5的部分：relay、buzz、motor……等不要放到while循环里，会造成蜂鸣器暴鸣。而是应该写一个带形参的函数，直接进行调用
  • led的刷新：放在定时计数器里面，每2ms刷新一次比较恰当
  • 涉及超声波的变量，无脑采用unsigned int

2.代码效果

        波形输出需要有20%占空比和80%占空比两种，实测波形分别如下：

        询问了学院博士，回答说高电平转低电平时，产生的向下的尖刺可能时由于motor端口，是用来驱动电机的，电路中自带一个电感，因此波形有向下的尖刺

3.单个模块代码

        继电器和motor端口

        超声波初始化函数

        波形输出控制

4.完整参考代码

        basecode.h

#ifndef __BASECODE_H__
#define __BASECODE_H__unsigned char code duanma[20] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xc0,0x86,0x8e,0x89,0x8c,0x89,0x8c};
unsigned char code duanma_dot[10] = {0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10};void select_HC573 ( unsigned char channal );
void state_SMG ( unsigned char pos_SMG , unsigned char value_SMG );
void state_SMG_all ( unsigned char value_SMG_all );
void init_sys ();
unsigned char pcf8591_rb2 ();
void pcf8591_dac ( unsigned char dac_value );
void at24c02_write ( unsigned char addr_value , unsigned char value );
unsigned char at24c02_read ( unsigned char addr_value );
#endif

basecode.c

#include <REGX51.H>
#include "iic.h"void Delay()		//@12.000MHz
{unsigned char i, j;i = 24;j = 85;do{while (--j);} while (--i);
}//锁存器通道选择函数
void select_HC573 ( unsigned char channal )
{switch ( channal ){case 4:P2 = ( P2 & 0x1f ) | 0x80;break;case 5:P2 = ( P2 & 0x1f ) | 0xa0;break;case 6:P2 = ( P2 & 0x1f ) | 0xc0;break;case 7:P2 = ( P2 & 0x1f ) | 0xe0;break;case 0:P2 = ( P2 & 0x1f );break;}
}//单位数码管显示函数
void state_SMG ( unsigned char pos_SMG , unsigned char value_SMG )
{P0 = 0x01 << pos_SMG;	select_HC573( 6 );select_HC573 ( 0 );P0 = value_SMG;select_HC573( 7 );select_HC573 ( 0 );
}//全位数码管静态显示
void state_SMG_all ( unsigned char value_SMG_all )
{P0 = 0xff;	select_HC573( 6 );select_HC573 ( 0 );P0 = value_SMG_all;select_HC573( 7 );select_HC573 ( 0 );
}	//初始化系统，关闭继电器和蜂鸣器
void init_sys ()
{P0 = 0xff;	select_HC573 ( 4 );select_HC573 ( 0 );P0 = 0x00;select_HC573 ( 5 );select_HC573 ( 0 );}unsigned char pcf8591_rb2 ()
{unsigned char rb2_value = 0;I2CStart();I2CSendByte(0x90);I2CWaitAck();I2CSendByte(0x03);I2CWaitAck();I2CStop();Delay();I2CStart();I2CSendByte(0x91);I2CWaitAck();rb2_value = I2CReceiveByte();I2CSendAck(1);	I2CStop();return rb2_value;
}void pcf8591_dac ( unsigned char dac_value )
{	I2CStart();I2CSendByte(0x90);I2CWaitAck();I2CSendByte(0x43);I2CWaitAck();I2CSendByte(dac_value);I2CWaitAck();I2CStop();
}void at24c02_write ( unsigned char addr_value , unsigned char value )
{I2CStart();I2CSendByte(0xa0);I2CWaitAck();I2CSendByte(addr_value);I2CWaitAck();I2CSendByte(value);I2CWaitAck();I2CStop();
}/**
//用于测试eeprom是否成功写入
unsigned char at24c02_read ( unsigned char addr_value )
{unsigned char tmp;I2CStart();I2CSendByte(0xa0);I2CWaitAck();I2CSendByte(addr_value);I2CWaitAck();I2CStart();I2CSendByte(0xa1);I2CWaitAck();tmp = I2CReceiveByte();I2CSendAck(1);I2CStop();return tmp;
}
**/

main.c

#include <intrins.h>
#include <REGX51.H>
#include "basecode.h"sfr CMOD = 0xD9;   //0xxx,x000 PCA 工作模式寄存器
sfr CL = 0xE9;   //0000,0000 PCA计数器低字节
sfr CH = 0xF9;   //0000,0000 PCA计数器高字节
sfr CCON = 0xD8;   //00xx,xx00 PCA控制寄存器
sfr AUXR = 0x8e;
sbit TX = P1^0;
sbit RX = P1^1;
sbit s7 = P3^0;
sbit s6 = P3^1;
sbit s5 = P3^2;
sbit s4 = P3^3;
sbit CF = CCON^7;
sbit CR = CCON^6;unsigned char SMG_mode = 1;
unsigned char flash_count = 0;
unsigned int dis_fre = 0;
unsigned int dis_k_fre = 0;
unsigned char dis_humidity = 0;
unsigned int dis_distance = 0;
unsigned char param_k_fre = 90;
unsigned char param_m_distance = 60;
unsigned char param_humidity = 40;void flash_SMG ();void state_led ( unsigned char value_led )
{select_HC573 ( 0 );P0 = value_led;	select_HC573 ( 4 );select_HC573 ( 0 );	
}unsigned char hc573_5_value = 0x00;
unsigned char value_led = 0xff;
void relay_work( unsigned char relay_flag )
{if ( relay_flag == 1 )hc573_5_value |= 0x10;elsehc573_5_value &= ~0x10;P0 = hc573_5_value;	select_HC573 ( 5 );select_HC573 ( 0 );	}void motor_work( unsigned char motor_flag )
{if ( motor_flag == 1 )hc573_5_value |= 0x20;elsehc573_5_value &= ~0x20;P0 = hc573_5_value;	select_HC573 ( 5 );select_HC573 ( 0 );	
}void Delay14us()		//@11.0592MHz
{unsigned char i;_nop_();i = 36;while (--i);
}void init_pca ()
{CMOD = 0x00;CCON = 0x00;
}void send_sonic ()
{unsigned char i;TR1 = TR0 = 0;for ( i=0 ; i<8 ; i++ ){TX = 1;Delay14us();TX = 0;Delay14us();}TR1 = TR0 = 1;
}bit flag_sonic = 0;
void flash_sonic ()
{if ( flag_sonic == 1 ){unsigned int time;CL = CH = 0;CF = 0;send_sonic ();CR = 1; while ( RX == 1 && CF == 0 );CR = 0;if ( RX == 1 ){dis_distance = 999;CF = 0;}else{time = CH;time = (time<<8) | CL;dis_distance = (unsigned int)(time*0.0172);}flag_sonic = 0;dis_distance = dis_distance;}}unsigned char rb2_value;
bit flag_rb2 = 0;
void flash_rb2 ()
{if ( flag_rb2 == 1 ){rb2_value = pcf8591_rb2 ();flag_rb2 = 0;}
}void init_timer1(void)		//50微秒@12.000MHz
{AUXR &= 0xBF;		//定时器时钟12T模式TMOD &= 0x0F;		//设置定时器模式TL1 = 0xCE;		//设置定时初始值TH1 = 0xFF;		//设置定时初始值TF1 = 0;		//清除TF1标志TR1 = 1;		//定时器1开始计时ET1 = 1;EA = 1;
}void init_timer0 (void)		
{AUXR &= 0x7F;		//定时器时钟12T模式TMOD &= 0xF0;		//设置定时器模式TMOD |= 0x06;		//设置定时器模式TL0 = 0xff;		//设置定时初始值TH0 = 0xff;		//设置定时重载值TF0 = 0;		//清除TF0标志TR0 = 1;		//定时器0开始计时ET0 = 1;EA = 1;
}unsigned int count_fre = 0;
void timer0_service  () interrupt 1
{count_fre ++ ;
}unsigned char count_50us = 0;
unsigned char count_10ms = 0;
unsigned char count_5ms = 0;
unsigned char count_relay = 0;
//unsigned char count_relay_test = 0x00;//用于数码管，测试eeprom的数据是否写入成功
unsigned char count_motor = 0;
unsigned int count_relay_50us = 0;
bit led_100ms = 0;
bit flag_dac = 0;
bit clear_relay = 0;
bit clear_relay_1s = 0;
bit count_motor_flag = 0;
bit count_relay_flag = 0;
void timer1_service () interrupt 3
{if ( ++count_50us == 200 ){count_50us = 0;if ( ++count_10ms == 100 )		{count_10ms = 0;dis_fre = count_fre;count_fre = 0;}}	if ( count_50us % 100 == 0 ){count_5ms++;if ( count_5ms == 200 ){count_5ms = 0;flag_sonic = 1;}if ( count_5ms % 20 == 0 )led_100ms = ~led_100ms;if ( count_5ms % 100 == 0 )     //外设刷新时间控制{flag_rb2 = 1;			flag_dac = 1;}}if ( count_motor_flag == 1 ){if ( ++count_motor < 160 ){motor_work(1);}else{motor_work(0);}}else if ( count_motor_flag == 0 ){if ( ++count_motor < 40 ){motor_work(1);}else{motor_work(0);}}if ( count_motor >= 20 ){count_motor = 0;}if ( clear_relay == 1 ){if ( ++count_relay_50us > 2000 ){clear_relay_1s = 1;}}if ( count_50us % 40 == 0 ){if ( SMG_mode == 3 ){if ( ++flash_count > 2 ) {flash_count = 0;}}else if ( SMG_mode == 4 || SMG_mode == 5 || SMG_mode == 7 || SMG_mode == 8 ){if ( ++flash_count > 3 ) {flash_count = 0;}}else if ( SMG_mode == 6 ){if ( ++flash_count > 4 ) {flash_count = 0;}}else if ( SMG_mode == 1 || SMG_mode == 2 ){if ( ++flash_count == 7 ) {flash_count = 0;}}flash_SMG ();state_led ( value_led );}}void value_running ()
{unsigned char temp_dac = 0;dis_k_fre = dis_fre/100;if ( rb2_value > 254 ){dis_humidity =99;}else{dis_humidity = (int)(rb2_value/2.55);}if ( dis_humidity > 80 ){temp_dac = 255;}else if ( dis_humidity > param_humidity ){temp_dac = (int)(dis_humidity*(4.0/80-param_humidity));value_led &= 0xef;}else {temp_dac = 52;value_led |= 0x10;}pcf8591_dac ( temp_dac );flag_dac = 0;if ( clear_relay == 1 ){if ( clear_relay_1s == 1 ){count_relay = 0;at24c02_write ( 0x00 , count_relay );}}else {clear_relay_1s = 0;count_relay_50us = 0;}if ( dis_distance > param_m_distance ){relay_work( 1 ); value_led &= 0xdf;if ( count_relay_flag == 1 ){count_relay++;count_relay_flag = 0;at24c02_write ( 0x00 , count_relay );}}else{relay_work( 0 ); value_led |= 0x20;count_relay_flag = 1;}if ( dis_k_fre > param_k_fre ){count_motor_flag = 1;value_led &= 0xf7;}else {count_motor_flag = 0;value_led |= 0x08;}//频率界面12 湿度界面3 测距界面45 参数界面678if ( SMG_mode == 1 || SMG_mode == 2 ){value_led |= 0x06;if ( led_100ms == 1 )value_led &= 0xfe;elsevalue_led |= 0x01;}else if ( SMG_mode == 3 ){value_led |= 0x05;if ( led_100ms == 1 )value_led &= 0xfd;elsevalue_led |= 0x02;}else if (SMG_mode == 4 || SMG_mode == 5 ){value_led |= 0x03;if ( led_100ms == 1 )value_led &= 0xfb;elsevalue_led |= 0x04;}}void flash_SMG ()
{state_SMG_all ( 0xff );if ( SMG_mode == 1 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[15] );break;case 1:if ( dis_fre > 99999 )state_SMG ( 2 , duanma[dis_k_fre/100000] );elsestate_SMG ( 2 , 0xff );break;			case 2:if ( dis_fre > 9999 )state_SMG ( 3 , duanma[dis_fre/10000%10] );elsestate_SMG ( 3 , 0xff );break;case 3:if ( dis_fre > 999 )state_SMG ( 4 , duanma[dis_fre/1000%10] );elsestate_SMG ( 4 , 0xff );break;			case 4:if ( dis_fre > 99 )state_SMG ( 5 , duanma[dis_fre/100%10] );elsestate_SMG ( 5 , 0xff );break;	case 5:if ( dis_fre > 9 )state_SMG ( 6 , duanma[dis_fre/10%10] );elsestate_SMG ( 6 , 0xff );break;	case 6:state_SMG ( 7 , duanma[dis_fre%10] );}		}else if ( SMG_mode == 2 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[15] );break;case 1:if ( dis_k_fre > 9999 )state_SMG ( 2 , duanma[dis_k_fre/100000] );elsestate_SMG ( 2 , 0xff );break;			case 2:if ( dis_k_fre > 9999 )state_SMG ( 3 , duanma[dis_k_fre/10000%10] );elsestate_SMG ( 3 , 0xff );break;case 3:if ( dis_k_fre > 999 )state_SMG ( 4 , duanma[dis_k_fre/1000%10] );elsestate_SMG ( 4 , 0xff );break;			case 4:if ( dis_k_fre > 99 )state_SMG ( 5 , duanma[dis_k_fre/100%10] );elsestate_SMG ( 5 , 0xff );break;	case 5:if ( dis_k_fre > 9 )state_SMG ( 6 , duanma_dot[dis_k_fre/10%10] );else if ( dis_k_fre < 10 )state_SMG ( 6 , duanma_dot[0] );elsestate_SMG ( 6 , 0xff );break;	case 6:state_SMG ( 7 , duanma[dis_k_fre%10] );}						}else if ( SMG_mode == 3 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[16] );break;case 1:state_SMG ( 6 , duanma[dis_humidity/10] );break;case 2:state_SMG ( 7 , duanma[dis_humidity%10] );break;}		}
/**	else if ( SMG_mode == 3 )  //用于测试eeprom的数据是否写入成功{switch ( flash_count ){case 0:state_SMG ( 0 , duanma[14] );break;case 1:state_SMG ( 6 , duanma[count_relay_test/16] );state_SMG ( 3 , duanma[count_relay/10] );break;case 2:state_SMG ( 7 , duanma[count_relay_test%16] );state_SMG ( 4 , duanma[count_relay%10] );break;}		}**/else if ( SMG_mode == 4 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[10] );break;case 1:if ( dis_distance > 99 )state_SMG ( 5 , duanma[dis_distance/100] );elsestate_SMG ( 5 , 0xff );break;case 2:if ( dis_distance > 9 )state_SMG ( 6 , duanma[dis_distance/10%10] );elsestate_SMG ( 6 , 0xff );break;case 3:state_SMG ( 7 , duanma[dis_distance%10] );break;}		}else if ( SMG_mode == 5 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[10] );break;case 1:if ( dis_distance < 99 )state_SMG ( 5 , duanma_dot[0] );elsestate_SMG ( 5 , duanma_dot[dis_distance/100] );break;case 2:state_SMG ( 6 , duanma[dis_distance/10%10] );break;case 3:state_SMG ( 7 , duanma[dis_distance%10] );break;}				}else if ( SMG_mode == 6 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[17] );break;case 1:state_SMG ( 1 , duanma[1] );break;case 2:if ( param_k_fre > 99 )state_SMG ( 5 , duanma_dot[param_k_fre/100] );elsestate_SMG ( 5 , 0xff );break;case 3:if ( param_k_fre > 9 && param_k_fre < 99 )state_SMG ( 6 , duanma_dot[param_k_fre/10%10] );else if ( param_k_fre > 99 )state_SMG ( 6 , duanma[param_k_fre/10%10] );else state_SMG ( 6 , 0xff );break;case 4:state_SMG ( 7 , duanma[param_k_fre%10] );break;}		}else if ( SMG_mode == 7 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[17] );break;case 1:state_SMG ( 1 , duanma[2] );break;case 2:state_SMG ( 6 , duanma[param_humidity/10] );break;case 3:state_SMG ( 7 , duanma[0] );break;}		}else if ( SMG_mode == 8 ){switch ( flash_count ){case 0:state_SMG ( 0 , duanma[17] );break;case 1:state_SMG ( 1 , duanma[3] );break;case 2:state_SMG ( 6 , duanma_dot[param_m_distance/10] );break;case 3:state_SMG ( 7 , duanma[param_m_distance%10] );break;}		}
}void Delay2ms()		//@12.000MHz
{unsigned char i, j;i = 24;j = 85;do{while (--j);} while (--i);
}void key_scan ()
{if ( s7 == 0 ){Delay2ms();if ( s7 == 0 ){//频率界面12 湿度界面3 测距界面45 参数界面678if ( SMG_mode == 6 ){param_k_fre -= 5;if ( param_k_fre == 5 )param_k_fre = 120;}else if ( SMG_mode == 7 ){param_humidity -= 10;if ( param_humidity == 0 )param_humidity = 60;}else if ( SMG_mode == 8 ){param_m_distance -= 1;if ( param_m_distance == 0 )param_m_distance = 12;}			else if ( SMG_mode == 1 ){SMG_mode = 2;}else if ( SMG_mode == 2 ){SMG_mode = 1;}else if ( SMG_mode == 3 ){clear_relay = 1;}while ( s7 == 0 );clear_relay = 0;}}else if ( s6 == 0 ){Delay2ms();if ( s6 == 0 ){//频率界面12 湿度界面3 测距界面45 参数界面678if ( SMG_mode == 6 ){param_k_fre += 5;if ( param_k_fre == 125 )param_k_fre = 10;}else if ( SMG_mode == 7 ){param_humidity += 10;if ( param_humidity == 70 )param_humidity = 10;}else if ( SMG_mode == 8 ){param_m_distance += 1;if ( param_m_distance == 13 )param_m_distance = 1;}else if ( SMG_mode == 4 ){SMG_mode = 5;}else if ( SMG_mode == 5 ){SMG_mode = 4;}while ( s6 == 0 );}}else if ( s5 == 0 ){Delay2ms();if ( s5 == 0 ){switch ( SMG_mode ){case 6:SMG_mode = 7;break;case 7:SMG_mode = 8;break;case 8:SMG_mode = 6;break;}while ( s5	 == 0 );}}	else if ( s4 == 0 ){Delay2ms();if ( s4 == 0 ){switch ( SMG_mode ){case 1:case 2:SMG_mode = 3;break;case 3:SMG_mode = 4;break;case 4:case 5:SMG_mode = 6;break;case 6:case 7:case 8:SMG_mode = 1;break;}while ( s4 == 0 );}}
}void main ()
{init_sys ();init_timer0 ();init_timer1 ();init_pca ();
//	at24c02_write ( 0x00 , count_relay );
//	Delay2ms ();
//	count_relay_test = at24c02_read( 0x00 ); //用于测试eeprom是否写入成功while ( 1 ){key_scan ();value_running ();flash_rb2 ();flash_sonic ();}
}

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