第14届蓝桥杯单片机模拟题(我也不知道第几套)（4T）

最新推荐文章于 2025-06-10 21:40:42 发布

Wu小燕呀

最新推荐文章于 2025-06-10 21:40:42 发布

阅读量767

点赞数 1

分类专栏：蓝桥杯文章标签：单片机蓝桥杯嵌入式硬件

本文链接：https://blog.youkuaiyun.com/m0_54929728/article/details/129975712

版权

蓝桥杯专栏收录该内容

35 篇文章

订阅专栏

该代码段展示了在嵌入式系统中如何处理串口接收，包括初始化串口、接收中断处理以及数据的存储和显示。系统还包含按键扫描功能，用于改变显示内容。此外，有一个特定的函数用于从串口获取噪音数据并发送响应。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

串口有点难住我了，这里借鉴了一下这位博主的串口接收函数

代码如下：

main.c

#include "sys.h"

void KeyScans(void)
{
	l3 = l4 = h4 = 1;
	h3 = 0;
	if(l4 == 0)    //s17
	{
		Delay(10);
		if(interface)
		{
			para -= 5;
			if(para == -5)
				para = 0;
		}
		while(l4 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
	l3 = l4 = h3 = 1;
	h4 = 0;
	if(l3 == 0)   //s12
	{
		Delay(10);
		interface = ~interface;
		while(l3 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
	
	if(l4 == 0)  //s16
	{
		Delay(10);
		if(interface == 1)
		{
			para += 5;
			if(para == 95)
				para = 90;
		}
		while(l4 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
}

sys.c

#include "sys.h"

void Select_74hc138(uchar channel)
{
	switch(channel)
	{
		case 0: P2=P2&0X1F; break;
		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;
	}
}

void SystemInit(void)
{
	Select_74hc138(4);
	P0 = 0xff;
	Select_74hc138(5);
	P0 = 0x00;
	Select_74hc138(7);
	P0 = 0xff;
	Select_74hc138(0);
	UartInit();
	Timer0Init();
}

void Delay(uint ms)
{
	uint i;
	for(ms; ms > 0; ms--)
		for(i = 921; i > 0; i--);
}

void OperateLed(uchar who,status)
{
	static uchar temp;
	uchar zt;
	switch(status)
	{
		case 0:
			temp = temp|_crol_(0x01,who-1);
			P0 = ~temp;
			break;
		case 1: 
			zt = (~temp)|_crol_(0x01,who-1);
			if(temp != (~zt))
				temp = ~zt;
			P0 = zt;
			break;
	}
	Select_74hc138(4);
	Select_74hc138(0);
}

void Timer0Init(void)		//1毫秒@12.000MHz
{
	AUXR &= 0x7F;		//定时器时钟12T模式
	TMOD &= 0xF0;		//设置定时器模式
	TL0 = 0x18;		//设置定时初值
	TH0 = 0xFC;		//设置定时初值
	TF0 = 0;		//清除TF0标志
	TR0 = 1;		//定时器0开始计时
	ET0 = 1;
	EA = 1;
}

smg.c

#include "sys.h"

bit interface = 0;
uchar para = 65;
//extern bit uart_flag;//测试

code unsigned char Seg_Table[] =
{
	0xc0, //0
	0xf9, //1
	0xa4, //2
	0xb0, //3
	0x99, //4
	0x92, //5
	0x82, //6
	0xf8, //7
	0x80, //8
	0x90, //9
	0xc1  //U
};

void DisplayBit(uchar pos,value,bit dot)
{
	P0 = 0X00;
	Select_74hc138(6);
	Select_74hc138(0);
	
	if(dot)
		P0 = Seg_Table[value]&0x7f;
	else
		P0 = Seg_Table[value];
	Select_74hc138(7);
	Select_74hc138(0);
	
	P0 = _crol_(0x01,pos-1);
	Select_74hc138(6);
	Select_74hc138(0);
	
	Delay(1);
}

void DisplaySMG(void)
{
	if(interface == 0)
	{
		DisplayBit(1,10,0);
		DisplayBit(2,1,0);
		
//		DisplayBit(4,uart_flag,0);
		DisplayBit(6,noises/100,0);
		DisplayBit(7,noises/10%10,1);
		DisplayBit(8,noises%10,0);
		OperateLed(1,0);
		OperateLed(2,1);
	}
	else
	{
		DisplayBit(1,10,0);
		DisplayBit(2,2,0);
		
		DisplayBit(7,para/10,0);
		DisplayBit(8,para%10,0);
		OperateLed(1,1);
		OperateLed(2,0);
	}
}

key.c

#include "sys.h"

void KeyScans(void)
{
	l3 = l4 = h4 = 1;
	h3 = 0;
	if(l4 == 0)    //s17
	{
		Delay(10);
		if(interface)
		{
			para -= 5;
			if(para == -5)
				para = 0;
		}
		while(l4 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
	l3 = l4 = h3 = 1;
	h4 = 0;
	if(l3 == 0)   //s12
	{
		Delay(10);
		interface = ~interface;
		while(l3 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
	
	if(l4 == 0)  //s16
	{
		Delay(10);
		if(interface == 1)
		{
			para += 5;
			if(para == 95)
				para = 90;
		}
		while(l4 == 0)
		{
			DisplaySMG();
			Function();
		}
	}
}

uart.c

#include "sys.h"
uchar urdat;
uchar buf[10];  //接收到的数据
uchar index = 0;  //buf数组索引
bit uart_flag = 0;  //接收完成标志 1：接收完成
uchar tem[32];

void UartInit(void)		//9600bps@12.000MHz
{
	PCON &= 0x7F;		//波特率不倍速
	SCON = 0x50;		//8位数据,可变波特率
	AUXR &= 0xBF;		//定时器1时钟为Fosc/12,即12T
	AUXR &= 0xFE;		//串口1选择定时器1为波特率发生器
	TMOD &= 0x0F;		//清除定时器1模式位
	TMOD |= 0x20;		//设定定时器1为8位自动重装方式
	TL1 = 0xFD;		//设定定时初值
	TH1 = 0xFD;		//设定定时器重装值
	ET1 = 0;		//禁止定时器1中断
	TR1 = 1;		//启动定时器1
	ES = 1;
	EA = 1;
}

void SendByte(uchar dat)
{
	SBUF = dat;
	while(TI == 0);
	TI = 0;
}

void SendString(uchar *buf)
{
	while(*buf != '\0')
	{
		SendByte(*buf++);
	}
}

void GetNoisesFromUart(void)
{
	if(uart_flag == 1)  //接收完成
	{
		uart_flag = 0;
		if(strcmp(buf,"Return") == 0)
		{
			sprintf((char *)tem,"\n\rNoises:%.1fdB\n\r",noises/10.0);
			SendString(tem);	
		}
	}
}

void Uart(void) interrupt 4
{
	//接收中断
	
	if(RI)
	{
		RI = 0;
		urdat = SBUF;
		if(urdat == 'n')
		{
			OperateLed(8,0);
			uart_flag = 1;
			buf[index] = 'n';
			buf[index+1] = '\0';
			index = 0;
			
		}
		else
		{
			buf[index++] = urdat; //接收的数据暂时存到数组里
		}
	}
}

sys.h

#ifndef _SYS_H_
#define _SYS_H_

#include <STC15F2K60S2.H>
#include "intrins.h"
#include "stdio.h"
#include "string.h"

sbit l3 = P3^5;
sbit l4 = P3^4;
sbit h3 = P3^2;
sbit h4 = P3^3;

sbit sda = P2^1;
sbit scl = P2^0;

#define uchar unsigned char
#define uint unsigned int

extern uchar rb2;
extern uint noises;
extern bit interface;
extern uchar para;

void Function(void);
void Select_74hc138(uchar channel);
void SystemInit(void);
void Delay(uint ms);
void OperateLed(uchar who,status);
void Timer0Init(void);
//smg.c
void DisplayBit(uchar pos,value,bit dot);
void DisplaySMG(void);
//key.c
void KeyScans(void);
//iic.c
void ReadAIN3(void);

//uart.c
void UartInit(void);
void SendByte(uchar dat);
void SendString(uchar *buf);
void GetNoisesFromUart(void);

#endif