蓝桥杯单片机第十一届国赛 真题+代码
iic.c
/* # I2C代码片段说明1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。2. 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题中对单片机时钟频率的要求，进行代码调试和修改。
*/
#include <STC15F2K60S2.H>
#include "iic.h"
#include "intrins.h"sbit scl = P2^0;
sbit sda = P2^1;#define DELAY_TIME 5//
static void I2C_Delay(unsigned char n)
{do{_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_();_nop_(); }while(n--);
}//
void I2CStart(void)
{sda = 1;scl = 1;I2C_Delay(DELAY_TIME);sda = 0;I2C_Delay(DELAY_TIME);scl = 0;
}//
void I2CStop(void)
{sda = 0;scl = 1;I2C_Delay(DELAY_TIME);sda = 1;I2C_Delay(DELAY_TIME);
}//
void I2CSendByte(unsigned char byt)
{unsigned char i;for(i=0; i<8; i++){scl = 0;I2C_Delay(DELAY_TIME);if(byt & 0x80){sda = 1;}else{sda = 0;}I2C_Delay(DELAY_TIME);scl = 1;byt <<= 1;I2C_Delay(DELAY_TIME);}scl = 0;
}//
unsigned char I2CReceiveByte(void)
{unsigned char da;unsigned char i;for(i=0;i<8;i++){ scl = 1;I2C_Delay(DELAY_TIME);da <<= 1;if(sda) da |= 0x01;scl = 0;I2C_Delay(DELAY_TIME);}return da;
}//
unsigned char I2CWaitAck(void)
{unsigned char ackbit;scl = 1;I2C_Delay(DELAY_TIME);ackbit = sda; scl = 0;I2C_Delay(DELAY_TIME);return ackbit;
}//
void I2CSendAck(unsigned char ackbit)
{scl = 0;sda = ackbit; I2C_Delay(DELAY_TIME);scl = 1;I2C_Delay(DELAY_TIME);scl = 0; sda = 1;I2C_Delay(DELAY_TIME);
}unsigned int Read_v()
{unsigned int temp;I2CStart();I2CSendByte(0x90);I2CWaitAck();I2CSendByte(0x01);I2CWaitAck();I2CStart();I2CSendByte(0x91);I2CWaitAck();temp = I2CReceiveByte();I2CSendAck(1);I2CStop();return temp;
}iic.h
#ifndef __iic_h
#define __iic_hstatic void I2C_Delay(unsigned char n);
void I2CStart(void);
void I2CStop(void);
void I2CSendByte(unsigned char byt);
unsigned char I2CReceiveByte(void);
unsigned char I2CWaitAck(void);
void I2CSendAck(unsigned char ackbit);
unsigned int Read_v();#endifonewire.c
/* # 单总线代码片段说明1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。2. 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题中对单片机时钟频率的要求，进行代码调试和修改。
*///
#include <STC15F2K60S2.H>
#include "onewire.h"sbit DQ = P1^4;void Delay_OneWire(unsigned int t)
{unsigned char i;while(t--){for(i=0;i<12;i++);}
}//
void Write_DS18B20(unsigned char dat)
{unsigned char i;for(i=0;i<8;i++){DQ = 0;DQ = dat&0x01;Delay_OneWire(5);DQ = 1;dat >>= 1;}Delay_OneWire(5);
}//
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(5);}return dat;
}//
bit init_ds18b20(void)
{bit initflag = 0;DQ = 1;Delay_OneWire(12);DQ = 0;Delay_OneWire(80);DQ = 1;Delay_OneWire(10); initflag = DQ; Delay_OneWire(5);return initflag;
}unsigned int Read_temp()
{unsigned char LSB ,MSB;init_ds18b20();Write_DS18B20(0xcc);Write_DS18B20(0x44);init_ds18b20();Write_DS18B20(0xcc);Write_DS18B20(0xbe);LSB = Read_DS18B20();MSB = Read_DS18B20();return (MSB << 8 | LSB ) * 0.625;
}
onewire.h
#ifndef __onewire_h
#define __onewire_hvoid Delay_OneWire(unsigned int t);
void Write_DS18B20(unsigned char dat);
unsigned char Read_DS18B20(void);
bit init_ds18b20(void);
unsigned int Read_temp();#endifds1302.c
/* # DS1302代码片段说明1. 本文件夹中提供的驱动代码供参赛选手完成程序设计参考。2. 参赛选手可以自行编写相关代码或以该代码为基础，根据所选单片机类型、运行速度和试题中对单片机时钟频率的要求，进行代码调试和修改。
*/ //
#include <STC15F2K60S2.H>
#include "ds1302.h"
#include "intrins.h"sbit SCK = P1^7;
sbit SDA = P2^3;
sbit RST = P1^3;code unsigned char Write_addr[] = {0x80,0x82,0x84,0x86,0x88,0x8a,0x8c};
code unsigned char Read_addr[] = {0x81,0x83,0x85,0x87,0x89,0x8b,0x8d};
unsigned char time[] = {0x50,0x59,0x16};
void Write_Ds1302(unsigned char temp)
{unsigned char i;for (i=0;i<8;i++) { SCK = 0;SDA = temp&0x01;temp>>=1; SCK=1;}
} //
void Write_Ds1302_Byte( unsigned char address,unsigned char dat )
{RST=0; _nop_();SCK=0; _nop_();RST=1; _nop_(); Write_Ds1302(address); Write_Ds1302(dat); RST=0;
}//
unsigned char Read_Ds1302_Byte ( unsigned char address )
{unsigned char i,temp=0x00;RST=0; _nop_();SCK=0; _nop_();RST=1; _nop_();Write_Ds1302(address);for (i=0;i<8;i++) { SCK=0;temp>>=1; if(SDA)temp|=0x80; SCK=1;} RST=0; _nop_();SCK=0; _nop_();SCK=1; _nop_();SDA=0; _nop_();SDA=1; _nop_();return (temp);
}void Write_time()
{char i;Write_Ds1302_Byte(0x8e,0x00);for(i = 0;i < 3;i++)Write_Ds1302_Byte(Write_addr[i],time[i]);Write_Ds1302_Byte(0x8e,0x80);
}void Read_time()
{char i;for(i = 0;i < 3;i++)time[i] = Read_Ds1302_Byte(Read_addr[i]);
}ds1302.h
#ifndef __ds1302_h
#define __ds1302_hvoid Write_Ds1302(unsigned char temp) ;
void Write_Ds1302_Byte( unsigned char address,unsigned char dat ) ;
unsigned char Read_Ds1302_Byte ( unsigned char address );
void Write_time();
void Read_time();#endifsys.c
#include <STC15F2K60S2.H>
#include "sys.h"
#include "intrins.h"
void Delay_ms(unsigned int t) //@12.000MHz
{while(t--){unsigned char i, j;i = 12;j = 169;do{while (--j);} while (--i);}
}void Select_Hc573(char n)
{switch(n){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;}P2 = P2 & 0x1f;
}void Sys_Init()
{P0 = 0x00;Select_Hc573(5);P0 = 0xff;Select_Hc573(4);
}void Select_Bit(unsigned char pos,dat)
{P0 = 0x01 << pos;Select_Hc573(6);P0 = dat;Select_Hc573(7);Delay_ms(1);P0 = 0xff;Select_Hc573(7);
}sys.h
#ifndef __sys_h
#define __sys_hvoid Delay_ms(unsigned int t);
void Select_Hc573(char n);
void Sys_Init();
void Select_Bit(unsigned char pos,dat);#endifmain.c
#include <STC15F2K60S2.H>
#include "ds1302.h"
#include "iic.h"
#include "onewire.h"
#include "sys.h"sbit R1 = P3^0;
sbit R2 = P3^1;
sbit R3 = P3^2;
sbit R4 = P3^3;
sbit C1 = P4^4;
sbit C2 = P4^2;
sbit C3 = P3^5;
sbit C4 = P3^4;code unsigned char SMG[] = { ~0x3F,~0x06,~0x5B,~0x4F,~0x66,~0x6D,~0x7D,~0x07,~0x7F,~0x6F,~0x71,~0x76};
extern unsigned char time[];
unsigned int temp;//温度
unsigned int v;//电压
bit v_stata;// 1-亮 0-暗
bit flag_500ms;
bit flag_10ms;
unsigned char count1;
unsigned int count2,count3;
char param_time = 17;//时间参数
char param_temp = 25;//温度参数
char param_led = 4;//led参数
unsigned char key_val;//键值
bit mode;//0-数据界面 1-参数界面
unsigned char mode_dat;//0-时间 1-温度 2-亮暗状态
unsigned char mode_param;//0-时间 1-温度 2-LED
bit L3_flag;// 0-灭 1-亮void Display_time()//时间界面
{Select_Bit(0,SMG[time[2] / 16]);Select_Bit(1,SMG[time[2] % 16]);Select_Bit(2,SMG[0]);Select_Bit(3,SMG[time[1] / 16]);Select_Bit(4,SMG[time[1] % 16]);Select_Bit(5,SMG[0]);Select_Bit(6,SMG[time[0] / 16]);Select_Bit(7,SMG[time[0] % 16]);
}void Display_temp()//温度界面
{Select_Bit(0,SMG[10]);Select_Bit(5,SMG[temp / 100]);Select_Bit(6,SMG[temp / 10 % 10] - 0x80);Select_Bit(7,SMG[temp % 10]);
}void Display_v()//亮暗状态显示
{Select_Bit(0,SMG[11]);Select_Bit(2,SMG[v / 100] - 0x80);Select_Bit(3,SMG[v / 10 % 10]);Select_Bit(4,SMG[v % 10]);Select_Bit(7,SMG[v_stata]);
}void Display_param_time()//时间参数界面
{Select_Bit(0,SMG[5]);Select_Bit(1,SMG[4]);Select_Bit(6,SMG[param_time / 10]);Select_Bit(7,SMG[param_time % 10]);
}void Display_param_temp()//温度参数界面
{Select_Bit(0,SMG[5]);Select_Bit(1,SMG[5]);Select_Bit(6,SMG[param_temp / 10]);Select_Bit(7,SMG[param_temp % 10]);
}void Display_param_led()//指示灯参数界面
{Select_Bit(0,SMG[5]);Select_Bit(1,SMG[6]);Select_Bit(7,SMG[param_led]);
}void Timer2Init(void) //10毫秒@12.000MHz
{AUXR &= 0xFB; //定时器时钟12T模式T2L = 0xF0; //设置定时初值T2H = 0xD8; //设置定时初值AUXR |= 0x10; //定时器2开始计时IE2 = 1 << 2;EA = 1;
}void Timer2_isr() interrupt 12
{if(++count1 > 50){count1 = 0;flag_500ms = 1;//光敏电阻半秒刷新}flag_10ms = 1;//按键扫描刷新if(!v_stata)//L3判断{if(++count2 > 300){count2 = 0;L3_flag = 1;}count3 = 0;}else{count2 = 0;if(++count3 > 300){count3 = 0;L3_flag = 0;}}
}unsigned char Key_Scan()//按键扫描函数
{unsigned char temp = 0;static unsigned char cnt4 = 0;static unsigned char cnt5 = 0;static unsigned char cnt8 = 0;static unsigned char cnt9 = 0;if(flag_10ms){R3 = 0;R1 = R2 = R4 = C1 = C2 = C3 = C4 = 1;if(C1 == 0) cnt5++;if(C1 == 1){if(cnt5 > 2) temp = 5;cnt5 = 0;}if(C2 == 0) cnt9++;if(C2 == 1){if(cnt9 > 2) temp = 9;cnt9 = 0;}R4 = 0;R1 = R2 = R3 = C1 = C2 = C3 = C4 = 1;if(C1 == 0) cnt4++;if(C1 == 1){if(cnt4 > 2) temp = 4;cnt4 = 0;}if(C2 == 0) cnt8++;if(C2 == 1){if(cnt8 > 2) temp = 8;cnt8 = 0;}flag_10ms = 0;}return temp;
}void Key_Pro()
{switch(key_val){case 4:mode ^= 1;if(!mode) mode_param = 0;else mode_dat = 0;break;case 5:if(!mode){if(++mode_dat > 2)mode_dat = 0;}else{if(++mode_param > 2)mode_param = 0;}break;case 8:if(mode){switch(mode_param){case 0:if(--param_time < 0)param_time = 23;break;case 1:if(--param_temp < 0)param_temp = 99;break;case 2:if(--param_led < 4)param_led = 8;break;}}break;case 9:if(mode){switch(mode_param){case 0:if(++param_time > 23)param_time = 0;break;case 1:if(++param_temp > 99)param_temp = 0;break;case 2:if(++param_led > 8)param_led = 4;break;}}break;}
}void Led(unsigned char addr,enable)//LED底层代码
{static unsigned char temp = 0x00;static unsigned char temp_old = 0xff;if(enable) temp |= 0x01 << addr;else temp &= ~(0x01 << addr);if(temp != temp_old){P0 = ~temp;Select_Hc573(4);temp_old = temp;}
}void Led_Pro()//LED控制代码
{if(param_time <= time[2] / 16 * 10 + time[2] % 16) Led(0,1);else Led(0,0);if(((float)temp) / 10 < param_temp) Led(1,1);else Led(1,0);if(L3_flag) Led(2,1);else Led(2,0);if(!v_stata){switch(param_led){case 4:Led(3,1);Led(4,0);Led(5,0);Led(6,0);Led(7,0);break;case 5:Led(4,1);Led(3,0);Led(5,0);Led(6,0);Led(7,0);break;case 6:Led(5,1);Led(4,0);Led(3,0);Led(6,0);Led(7,0);break;case 7:Led(6,1);Led(4,0);Led(5,0);Led(3,0);Led(7,0);break;case 8:Led(7,1);Led(4,0);Led(5,0);Led(6,0);Led(3,0);break;}}else{Led(3,0);Led(4,0);Led(5,0);Led(6,0);Led(7,0);}
}void main()
{Sys_Init();//系统初始化关闭继电器和蜂鸣器Read_temp();//读取温度延时750ms以消除上电显示85Delay_ms(750);Write_time();//初始化写入时间Timer2Init();//定时器2初始化while(1){temp = Read_temp();//读取温度Read_time();//读取时间if(flag_500ms)//半秒读取一次光敏电阻电压{flag_500ms = 0;v = Read_v() / 51.0 * 100;}if(v > 150) v_stata = 1;else v_stata = 0;key_val = Key_Scan();//读取键值Key_Pro();//按键处理函数Led_Pro();//LED处理函数if(!mode)//0-数据界面 1-参数界面{switch(mode_dat)//0-时间界面 1-温度界面 2-亮暗状态界面{case 0:Display_time();break;case 1:Display_temp();break;case 2:Display_v();break;}}else//参数界面下{switch(mode_param)//0-时间参数界面 1-温度参数界面 2-LED参数界面{case 0:Display_param_time();break;case 1:Display_param_temp();break;case 2:Display_param_led();break;}}}
}