#include <avr/io.h>
#include <util/delay.h>
//口定义
#define PORT_DHT PORTC
//口方向定义
#define DDR_DHT DDRC
//读取口定义
#define PIN_DHT PINC
//数据位定义
#define BIT_DHT PC4
#define RS PA0 //数据/命令控制端 0命令，1 数据
#define RW PA1 //读/写选择控制端 0写，1读
#define E PA2 //使能端 下降沿读，高电平写
#define L_DHT PORT_DHT&=~(1<<BIT_DHT) //数据线强制拉低
#define H_DHT PORT_DHT|=(1<<BIT_DHT) //数据线强制拉高
#define O_DHT DDR_DHT|=(1<<BIT_DHT) //Mega16控制总线,PD4为输出
#define P_DHT DDR_DHT&=~(1<<BIT_DHT) //释放总线,PD4为输入
#define I_DHT PIN_DHT&(1<<BIT_DHT) //数据线的状态
void LCDPort_Init(void); //液晶端口初始化
void LCD_Init(void); //LCD 初始化
void Write_Com(unsigned char LCD_Com); //LCD 写指令
void Write_Data_Byte(unsigned char LCD_Data); //LCD 写字节数据
void Write_Place_xy(unsigned char x,unsigned char y); //指定当前写字符的位置
void Write_Data_String(unsigned char x,unsigned char y,unsigned char *data);//在指定的（x，y）位置上写入字符串数据
void Write_Data_Char(unsigned char x,unsigned char y,unsigned char data);//在指定的（x，y）位置上写入字符数据
void Check_Busy(void); //读写检测函数，每次对液晶操读作前都要进行写检测
void Delayus(unsigned int lus); //us延时函数
void Delayms(unsigned int lms); //ms延时函数
/*******************************************************/
unsigned Reset()
{
O_DHT;
H_DHT;
_delay_us(2);
L_DHT;
_delay_us(19);
P_DHT;
_delay_us(20);
if(I_DHT)
return 0;
else
return 1;
}
int main(void)
{
_delay_ms(1000);
unsigned char tdata[5];
unsigned long u16Flag; // 超时计数
unsigned char iiii;
unsigned long u32I; // 接收数据临时变量
unsigned long ReceiveValue = 0; // 接收数据包变量
unsigned long ReceiveValue1 = 0; // 接收校验和变量
unsigned int ReceiveHighByte; // 分解数据包 湿度
unsigned int ReceiveLowByte; // 分解数据包温度
LCDPort_Init();
LCD_Init();
Write_Data_String(0,0,"ddddddd");
while(1)
if(Reset())
{ P_DHT;
while((!(I_DHT)) && ((u16Flag++)<50000));
ReceiveValue = 0;
ReceiveValue1 = 0;
u16Flag = 0;
while((I_DHT) && ((u16Flag++)<50000));
for(u32I=0x80000000; u32I>0; u32I>>=1)
{
u16Flag = 0;
while((!(I_DHT))&& ((u16Flag++)<3000));
u16Flag = 0;
_delay_us(28);
if(I_DHT)
{
ReceiveValue |= u32I;
}
while((I_DHT)&&((u16Flag++)<300));
}
for(u32I=0x80;u32I>0;u32I>>=1)
{
u16Flag = 0;
while((!(I_DHT))&&((u16Flag++)<3000));
u16Flag = 0;
_delay_us(28);
if(I_DHT)
{
ReceiveValue1 |= u32I;
}
while((I_DHT)&&((u16Flag++)<300));
}
while(!(I_DHT));
O_DHT;
H_DHT;
ReceiveLowByte =(unsigned int )( ReceiveValue&0x0000FFFF);
ReceiveHighByte = ReceiveValue>>16;
/****************************display******************************/
tdata[0]=*((unsigned char*)(&ReceiveHighByte) + 1)/10;
tdata[1]=*((unsigned char*)(&ReceiveHighByte) + 1)%10;
tdata[2]=*((unsigned char*)(&ReceiveLowByte) + 1)/10;
tdata[3]=*((unsigned char*)(&ReceiveLowByte) + 1)%10;
Write_Com(0xc0);
Write_Data_Byte( tdata[0]+0x30 );//显示湿度十位
Write_Com(0xc1);
Write_Data_Byte( tdata[1]+0x30 );//显示湿度个位
Write_Com(0xc2);
// Write_Data_Byte("%");
Write_Com(0xc4);
Write_Data_Byte( tdata[2]+0x30 );//显示温度十位
Write_Com(0xc5);
Write_Data_Byte( tdata[3]+0x30 );//显示温度个位
Write_Com(0xc6);
Write_Data_Byte(0xdf);//显示"。"
Write_Com(0xc7);
Write_Data_Byte('C');
}
else
{
}
}
void LCDPort_Init()
{
//LCD 数据端口设置
PORTD = 0X00; //
DDRD = 0XFF; //配置端口PD全部为输出口,LCD 数据端口
//LCD 控制端口设置
PORTA &= ~((1 << RS) | (1 << RW) | (1 << E)); //
DDRA |= (1 << RS) | (1 << RW) | (1 << E);
}
//LCD 初始化
void LCD_Init()
{
Write_Com(0X01); //清屏
Delayms(5);
Write_Com(0X38); //显示模式设置 16x2显示，5x7点阵，8 位数据接口
Delayms(5);
//Write_Com(0X0f); //显示开关控制，开显示，光标显示，光标闪烁
Write_Com(0X0c); //显示开关控制，开显示，光标不显示，光标不闪烁
Delayms(5);
Write_Com(0X06); //光标设置，读或写一个字符后，地址指针加一，光标加一，整屏不移动
Delayms(5);
}
//LCD 写指令
void Write_Com(unsigned char LCD_Com)
{
Check_Busy();
PORTA &= ~(1 << RS); //RS=0，写命令
PORTA &= ~(1 << RW); //RW=0，写指令
PORTA |= (1 << E); //E=1，写操作
Delayms(1);
PORTD = LCD_Com; //指令送数据端口
PORTA &= ~(1 << E); //E=0，停止写操作
Delayms(1);
}
//LCD 写字节数据
void Write_Data_Byte(unsigned char LCD_Data)
{
Check_Busy();
PORTA |= (1 << RS); //RS=1，写数据
PORTA &= ~(1 << RW); //RW=0，写指令
PORTA |= (1 << E); //E=1，写操作
Delayms(1);
PORTD = LCD_Data; // 数据送数据端口
PORTA &= ~(1 << E); //E=0，停止写操作
Delayms(1);
}
//指定当前写字符的位置
void Write_Place_xy(unsigned char x,unsigned char y)
{
unsigned char address;
if(y == 0) //行位置
{
address = 0x80 + x; //列位置,
}
else
{
address = 0x80 + 0x40 + x; //
}
Write_Com(address); //写地址
}
//在指定的（x，y）位置上写入字符串数据
void Write_Data_String(unsigned char x,unsigned char y,unsigned char *data)
{
Write_Place_xy(x,y); //写地址
while(*data)
{
Write_Data_Byte(*data); //写字符串
data++; //指针地址加1
}
}
//在指定的（x，y）位置上写入字符数据 x列位置,y行位置
void Write_Data_Char(unsigned char x,unsigned char y,unsigned char data)
{
Write_Place_xy(x,y); //
Write_Data_Byte(data); //
}
//读写检测函数，每次对液晶操作前都要进行读写检测
void Check_Busy()
{
DDRD = 0X00; //PB口置为输入口，准备读取数据
PORTA &= ~(1 << RS); //RS=0，读命令
PORTA |= (1 << RW); //RW=1，读指令
PORTA |= (1 << E); //E=1，使能
while(0X80 & PIND); //监测忙信号，直到忙信号为0，才能进行读写操作
PORTA &= ~(1 << E); //E=0
DDRD = 0XFF; //PB口置为输出口，准备向端口发送数据
}
//us级别的延时函数
void Delayus(unsigned int lus)
{
while(lus--)
{
_delay_loop_2(4); //_delay_loop_2(1)是延时4 个时钟周期，参数为4 则延时16
//个时钟周期，本实验用16M晶体，则16 个时钟周期为16/16=1us
}
}
//ms级别的延时函数
void Delayms(unsigned int lms)
{
while(lms--)
{
Delayus(1000); //延时1ms
}
}
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