蓝桥杯之单片机学习（二十六）——模拟风扇控制系统（附题目和完整代码）
文章目录
一、题目要求
二、代码操作
2.1 main.c
#include <STC15F2K60S2.h>
#include "onewire.h"
#define uchar unsigned char
#define uint unsigned int
uchar code SMG_duanma[19] =
{0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,
0x88,0x80,0xc6,0xc0,0x86,0x8e,
0xbf,0x7f,0XFF};//分别是0-9（对应下标），A-F，“-”，“.”,“灭”
//分别是“0.-9.”
uchar code SMG_Dot_AC[10] =
{0X40,0X79,0X24,0X30,0X19,0X12,0X02,0X78,0X00,0X10};
uchar yi,er,san,si,wu,liu,qi,ba;
//工作模式记录
uchar MODE = 1;
//时间记录
uchar Time = 0;
//时间模式检查
uchar Mode_Time = 0;
//停止标识位(为0时停止)
uchar Check_Time_Sign = 1;
//定时PWM标志位
uchar tt = 0;
//室温模式检查
uchar Mode_Temp_Display = 0;
//记秒标志位
uint miao = 0;
//系统初始化
void Initsys();
//配置HC138
void SelectHC138(uchar channel);
//在pos位码上，显示value段码
void DisplaySMG_Bit(uchar pos, uchar value);
//数码管8位码显示
void SMG_Display();
//数码管的延时
void Delay_one_ms_SMG();
//独立按键(BTN)
void Alone_Key();
//按键消抖延时
void Delay_five_ms_Key();
void Timer0Init(void); //100微秒@11.0592MHz
void main()
{
yi = er = san = si = wu = liu = qi = ba = 18;
Initsys();
Timer0Init(); //100微秒@11.0592MHz
while(1)
{
yi = 16; er = MODE; san = 16;si = 18;
wu = Time / 1000; liu = Time % 1000 / 100; qi = Time % 100 / 10 ; ba = Time % 10;
Alone_Key();
SMG_Display();
if(Time == 0 || Check_Time_Sign == 0)
{
SelectHC138(4);
P0 = 0XFF;
}
if(Mode_Temp_Display == 1)
{
uchar temp;
while(1)
{
uchar flag = 0;
temp = Temper();
yi = 16; er = 4; san = 16;si = 18;
wu = 18; liu = temp / 10; qi = temp % 10; ba = 12;
SMG_Display();
if(P30 == 0)
{
Delay_five_ms_Key();
if(P30 == 0)
{
flag = 1;
}
while(!P30);
}
if(flag == 1){Mode_Temp_Display = 0;break;}
}
}
}
}
//按键消抖延时
void Delay_five_ms_Key()
{
uint i,j;
for(i = 0; i < 5; i++)
for(j = 845; j > 0; j--);
}
//独立按键(BTN)
void Alone_Key()
{
//S7按键
if(P30 == 0)
{
Delay_five_ms_Key();
if(P30 == 0)
{
if(Mode_Temp_Display == 0)Mode_Temp_Display = 1;
else if(Mode_Temp_Display == 1)Mode_Temp_Display = 0;
}
while(!P30);
}
//S6按键
else if(P31 == 0)
{
Delay_five_ms_Key();
if(P31 == 0)
{
SelectHC138(4);
if(Check_Time_Sign == 1){Check_Time_Sign = 0;Time = 0;P0 = 0XFF;}
else if(Check_Time_Sign == 0)Check_Time_Sign = 1;
}
while(!P31);
}
//S5按键
else if(P32 == 0)
{
Delay_five_ms_Key();
if(P32 == 0)
{
if(Mode_Time == 0){Mode_Time = 1;Time = 60;}
else if(Mode_Time == 1){Mode_Time = 2;Time = 120;}
else if(Mode_Time == 2){Mode_Time = 0;Time = 0;}
}
while(!P32);
}
//S4按键
else if(P33 == 0)
{
Delay_five_ms_Key();
if(P33 == 0)
{
SelectHC138(4);
if(MODE == 1){MODE = 2;P0 = 0XFD;}
else if(MODE == 2){MODE = 3;P0 = 0XFB;}
else if(MODE == 3){MODE = 1;P0 = 0XFE;}
}
while(!P33);
}
}
//配置HC138
void SelectHC138(uchar channel)
{
switch(channel)
{
case 4: //LED
P2 = (P2 & 0X1F) | 0X80;
break;
case 5: //蜂鸣器和继电器
P2 = (P2 & 0X1F) | 0Xa0;
break;
case 6: //位码
P2 = (P2 & 0X1F) | 0Xc0;
break;
case 7: //段码
P2 = (P2 & 0X1F) | 0Xe0;
break;
case 0: //锁住所有寄存器
P2 = (P2 & 0X1F) | 0X00;
break;
}
}
//系统初始化
void Initsys()
{
SelectHC138(5);
P0 = 0X00;//关闭蜂鸣器和继电器
SelectHC138(4);
P0 = 0XFF;//关闭LED
SelectHC138(6);
P0 = 0XFF; //选择所有数码管
SelectHC138(7);
P0 = 0XFF; //关闭所有数码管
}
//在pos位码上，显示value段码
void DisplaySMG_Bit(uchar pos, uchar value)
{
SelectHC138(6);
P0 = 0X01 << pos;
SelectHC138(7);
P0 = value;
}
//数码管8位码显示
void SMG_Display()
{
DisplaySMG_Bit(0, SMG_duanma[yi]);
Delay_one_ms_SMG();
DisplaySMG_Bit(1, SMG_duanma[er]);
Delay_one_ms_SMG();
DisplaySMG_Bit(2, SMG_duanma[san]);
Delay_one_ms_SMG();
DisplaySMG_Bit(3, SMG_duanma[si]);
Delay_one_ms_SMG();
DisplaySMG_Bit(4, SMG_duanma[wu]);
Delay_one_ms_SMG();
DisplaySMG_Bit(5, SMG_duanma[liu]);
Delay_one_ms_SMG();
DisplaySMG_Bit(6, SMG_duanma[qi]);
Delay_one_ms_SMG();
DisplaySMG_Bit(7, SMG_duanma[ba]);
Delay_one_ms_SMG();
}
//数码管的延时
void Delay_one_ms_SMG()
{
uint j;
for(j = 845; j > 0; j--);
}
void Timer0Init(void) //100微秒@11.0592MHz
{
AUXR |= 0x80; //定时器时钟1T模式
TMOD &= 0xF0; //设置定时器模式
TL0 = 0xAE; //设置定时初值
TH0 = 0xFB; //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;
}
//PWM和倒计时
void Timer0Server() interrupt 1
{
tt++;
miao++;
if(tt == 11)tt = 1;
if(Time > 0 && Check_Time_Sign == 1)
{
if(MODE == 1)
{
if(tt < 3)P34 = 1;
else P34 = 0;
}
else if(MODE == 2)
{
if(tt < 4 )P34 = 1;
else P34 = 0;
}
else if(MODE == 3)
{
if(tt < 8)P34 = 1;
else P34 = 0;
}
}
if(miao == 10000)
{
miao = 0;
if(Time > 0)Time--;
}
}
2.2 onewire.c
/*
程序说明: 单总线驱动程序
软件环境: Keil uVision 4.10
硬件环境: CT107单片机综合实训平台(外部晶振12MHz) STC89C52RC单片机
日 期: 2011-8-9
*/
#include "reg52.h"
sbit DQ = P1^4; //单总线接口
//单总线延时函数
void Delay_OneWire(unsigned int t) //STC89C52RC
{
while(t--);
}
//通过单总线向DS18B20写一个字节
void Write_DS18B20(unsigned char dat)
{
unsigned char i;
for(i=0;i<8;i++)
{
DQ = 0;
DQ = dat&0x01;
Delay_OneWire(50);
DQ = 1;
dat >>= 1;
}
Delay_OneWire(50);
}
//从DS18B20读取一个字节
unsigned char Read_DS18B20(void)
{
unsigned char i;
unsigned char dat;
for(i=0;i<8;i++)
{
DQ = 0;
dat >>= 1;
DQ = 1;
if(DQ)
{
dat |= 0x80;
}
Delay_OneWire(50);
}
return dat;
}
//DS18B20设备初始化
bit init_ds18b20(void)
{
bit initflag = 0;
DQ = 1;
Delay_OneWire(120);
DQ = 0;
Delay_OneWire(800);
DQ = 1;
Delay_OneWire(100);
initflag = DQ;
Delay_OneWire(50);
return initflag;
}
unsigned char Temper()
{
unsigned char di8,gao8,temp;
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0x44);
Delay_OneWire(200);
init_ds18b20();
Write_DS18B20(0xcc);
Write_DS18B20(0xbe);
di8=Read_DS18B20();
gao8=Read_DS18B20();
temp=gao8<<4;
temp=temp|(di8>>4);
return temp;
}
三、PWM示波器测试
3.1 PWM20%输出波形
3.2 PWM30%输出波形
3.3 PWM70%输出波形
附、一些感悟
C语言中如何定义多个变量
查了网上，可以这样
int a,b,c;
a=b=c=5;
这样abc都是5了
