蓝桥杯知识汇总
1.数码管
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段码显示
uchar code display[] = {0xc0, 0xf9, 0xa4, 0xb0, 0x99, 0x92, 0x82, 0xf8, 0x80, 0x90, 0xbf, 0xff};
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打开或关闭数码管
P2 = (P2 & 0x1f) | 0xc0; P0 = order[cnt]; P2 &= 0x1f; P2 = (P2 & 0x1f) | 0xe0; P0 = display[disbuf[cnt]]; P2 &= 0x1f;
2.LED显示
P2 = (P2 & 0x1f) | 0x80;
P0 = 0xfe;
P2 &= 0x1f;
3.系统初始化
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关闭外设
P2 = ((P2 & 0x1f) | 0xa0); //关闭全部外设 P0 = 0x00; P2 &= 0x1f; P2 = (P2 & 0x1f) | 0xe0; //数码管都不显示 P0 = 0xff; P2 &= 0x1f;
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定时器设置
TMOD = 0x01; //计时器0,采用方式1 TH0 = (65536 - 2000) / 256; //定时2ms TL0 = (65536 - 2000) % 256; EA = 1; //打开总中断 ET0 = 1; //定时器中断0打开 TR0 = 1; //开始计数
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串口通信设置
SCON = 0x50; //工作方式1 AUXR = 0x40; TMOD = 0x20; TH1 = 256 - (11059200 / 2400 / 32); //波特率为2400 TL1 = 256 - (11059200 / 2400 / 32); EA = 1; //打开总中断 ES = 1; //打开串口中断 TR1 = 1; //打开计时器1
4.IIC
#define SlaveAddrW 0x90
#define SlaveAddrR 0x91
#define EEPROMW 0xa0
#define EEPROMR 0xa1
5.DS1302
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命令字
#define AM(X) X #define PM(X) (X + 12) #define DS1302_SECOND 0x80 #define DS1302_MINUTE 0x82 #define DS1302_HOUR 0x84 #define DS1302_DAY 0x86 #define DS1302_MONTH 0x88 #define DS1302_WEEK 0x8A #define DS1302_YEAR 0x8C #define DS1302_RAM(X) (0xC0 + (X) * 2)
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函数操作
//是否写保护 void DS1302_SetProtect(bit flag){ if (flag) Write_Ds1302(0x8e, 0x80); else Write_Ds1302(0x8e, 0x00); } //设置时间 void DS1302_SetTime(unsigned char Address, unsigned char Value){ DS1302_SetProtect(0); Write_Ds1302(Address, ((Value / 10) << 4) | (Value % 10)); //将十进制数转换成BCD码 } //转化时间格式 void DS1302_GetTime(SYSTEMTIME *Time){ unsigned char ReadValue; /* 将BCD码转换成十进制数 */ ReadValue = Read_Ds1302(DS1302_MINUTE | 0x01); Time->minute = ((ReadValue & 0x70)>>4) * 10 + (ReadValue & 0x0f); ReadValue = Read_Ds1302(DS1302_HOUR | 0x01); Time->hour = ((ReadValue & 0x70)>>4) * 10 + (ReadValue & 0x0f); } //时间初始化 void Time_Initial(){ unsigned char Second; DS1302_SetTime(DS1302_HOUR, 8); DS1302_SetTime(DS1302_MINUTE, 30); DS1302_SetTime(DS1302_SECOND, 0); Second = Read_Ds1302(DS1302_SECOND | 0x01); if (Second & 0x80){ DS1302_SetTime(DS1302_SECOND, 0); //启动时钟 } }
6.A/D
unsigned char Rb2_Read(){
unsigned char dat;
IIC_Start();
IIC_SendByte(0x90); //写入地址
IIC_WaitAck();
IIC_SendByte(0x43); //0x43是Rb2, 0x41是光敏
IIC_WaitAck();
IIC_Start();
IIC_SendByte(0x91); //读命令
IIC_WaitAck();
dat = IIC_RecByte(); //读取一个字节
IIC_Ack(0);
IIC_Stop();
return dat;
}
7.EEPROM(读取和写入数据都不可中断)
unsigned char Read_EEPROM(unsigned char con){
unsigned char dat;
IIC_Start();
IIC_SendByte(0xa0); //写入地址
IIC_WaitAck();
IIC_SendByte(con); //从起始位置开始读取
IIC_WaitAck();
IIC_Start();
IIC_SendByte(0xa1); //读命令
IIC_WaitAck();
dat = IIC_RecByte(); //读取一个字节
IIC_Ack(0);
IIC_Stop();
return dat;
}
void Write_EEPROM(unsigned char date, unsigned char con){
IIC_Start();
IIC_SendByte(0xa0);
IIC_WaitAck();
IIC_SendByte(con);
IIC_WaitAck();
IIC_SendByte(date);
IIC_WaitAck();
IIC_Stop();
Delay(3); //写入后要注意延时一段时间
}
8.DS18B20(读取温度不可中断)
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延时函数
//单总线延时函数 void Delay_OneWire(uint t) { char z; while(t--) for(z = 0; z < 12; z++); }
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读取温度
/* 读取数据不可中断,可以采用关闭终端来实现 */ unsigned int Read_Temperature(){ unsigned char low,high; unsigned int temp; float t; init_ds18b20(); //器件初始化 Write_DS18B20(0xcc); //跳过读序列 Write_DS18B20(0x44); //启动温度转换 Delay_OneWire(200); //延迟一会儿 init_ds18b20(); Write_DS18B20(0xcc); //同上 Write_DS18B20(0xbe); //读取温度 low = Read_DS18B20(); //读取低位 high = Read_DS18B20(); //读取高位 temp = (high << 8) | low; t = temp * 0.0625; temp = t + 0.5; return temp; }
原文地址:https://www.cnblogs.com/garden6zg/p/8469705.html
时间: 2024-10-21 23:26:06