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
