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- //做了一個DHT11溫濕度傳感器的1602的顯示，用8051做的，換成60s2的片子以后不行了...
- //我想應(yīng)該是機(jī)械周期的事吧，應(yīng)該怎么改呢，大家有遇到的幫幫我、、、這是簡單的顯示程序：
- //STC 延時比ATMEL 快了6～8倍，改一下DELAY的值就行了
- //這個你得該延時，因?yàn)?051是12T的時鐘周期而60S2是1T的
- //這是一個延時的問題，把延時改一下就好了
- #include <STC12C5A60S2.h>
- #define uchar unsigned char
- #define uint unsigned int
- /*引腳定義*/
- uchar code table[]="0123456789";
- sbit en=P2^1;
- sbit rs=P2^0;
- sbit io=P1^1;
- /*定義變量*/
- uchar data_byte=0, count, SHISHI, SHIGE, WENSHI, WENGE;
- uint TH_data, TL_data, RH_data, RL_data, CK_data;
- uint TH_temp, TL_temp, RH_temp, RL_temp, CK_temp;
- uchar num;
- /*延時程序*/
- void delayms(unsigned int xms)
- {
- uint i,j;
- for(i=xms;i>0;i--)
- for(j=110;j>0;j--);
- }
- /*10微妙延時程序*/
- void delay1()
- {
- unsigned char i;
- for(i=0; i<3; i++);
- }
- /*寫命令*/
- void command(uchar com)
- {
- rs=0;
- P0=com;
- en=1;
- delayms(5);
- en=0;
- delayms(5);
- }
- /*寫數(shù)據(jù)*/
- void information(uchar date)
- {
- rs=1;
- P0=date;
- en=1;
- delayms(5);
- en=0;
- delayms(5);
- }
- /*初始化*/
- void init()
- {
- en=0;
- command(0x38);//設(shè)置16x2顯示，5x7點(diǎn)陣，8位數(shù)據(jù)接口
- command(0x0c);//設(shè)置開顯示，不顯示光標(biāo)
- command(0x06);//寫一個字符后地址指針加一
- command(0x01);//顯示清零，數(shù)據(jù)指針清零
- }
- /**********************DHT11模塊**********************/
- uchar receive_byte()//接收一個字節(jié)
- {
- uchar i,temp;
- for(i=0;i<8; i++)
- {
- count = 2;
- while((!io) && count++)//等待50us低電平結(jié)束并防止死循環(huán)
- temp = 0;
- delay1();
- delay1();
- delay1();
- if (io==1)
- {
- temp = 1;
- count = 2;
- while(io && count++);
- }
- else
- temp = 0;
- data_byte<<=1;
- data_byte|=temp;
- }
- return (data_byte);
- }
- /*DHT11開始函數(shù)*/
- void read_io()//開始信號讀數(shù)據(jù)并校驗(yàn)
- {
- io = 0;
- delayms(18);//主機(jī)拉低18ms
- io=1;//DATA總線由上拉電阻拉高 主機(jī)延時20us
- delay1();
- delay1();
- delay1();
- delay1();
- io = 1;//主機(jī)設(shè)置為輸入高電平判斷從機(jī)響應(yīng)信號
- if(!io)
- {
- count = 2;
- while((!io)&&count++);//判斷DHT11發(fā)出80us低電平響應(yīng)信號是否結(jié)束
- count = 2;
- while(io && count++);//判斷DHT11拉高總線80us高電平是否結(jié)束
- RH_temp = receive_byte();
- RL_temp = receive_byte();
- TH_temp = receive_byte();
- TL_temp = receive_byte();
- CK_temp = receive_byte();
- io = 1;
- num = (RH_temp+RL_temp+TH_temp+TL_temp);//數(shù)據(jù)校驗(yàn)
- if(num==CK_temp)
- {
- RH_data=RH_temp;
- RL_data=RL_temp;
- TH_data=TH_temp;
- TL_data=TL_temp;
- CK_data=CK_temp;
- }
- }
- //濕度整數(shù)部分
- SHISHI = RH_data/10;
- SHIGE = RH_data%10;
- //溫度整數(shù)部分
- WENSHI =(char) TH_data/10;
- WENGE = (char) TH_data%10;
- }
- /*主函數(shù)*/
- void main()
- {
- P4SW=0x70;
- init();
- while(1)
- {
- read_io();
- command(0x80);
- information(table[WENSHI]);
- command(0x81);
- information(table[WENGE]);
- }
- }
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