温湿度计程序.doc

/*Project: SHTxx 驱动程序 4位数码管移位扫描显示*/#include /Microcontroller specific library, e.g. port definitions#include /Keil library (is used for _nop()_ operation)#define uchar unsigned char#define uint unsigned int#define outdata P0 /8951mcuenum TEMP,HUMI;sbit DATA=P21;sbit SCK=P20;#define noACK 0#define ACK 1#define MEASURE_TEMP 0x03 /000 0001 1#define MEASURE_HUMI 0x05 /000 0010 1#define RESET 0x1e /000 1111 0/-硬件配置-/P0口为段码数据，P1.4, P1.5, P1.6, P0.5 分别为1234位数码管/=显示段码数据=uchar duanma10=0x28,0xeb,0x32,0xa2,0xe1,0xa4,0x24,0xea,0x20,0xa0;/=位控制= sbit WEI1=P27;sbit WEI2=P26;sbit WEI3=P25;sbit WEI4=P24; /8951/=按键配置= /=显示缓冲区RAM配置= uchar buffer4=0,0,0,0;uchar wd,sd; union unsigned int i; float f;wendu,shidu;/定义两个共同体，一个用于湿度，一个用于温度/=void delayHM(uint k)/毫秒级延时子函数 uint i; uchar j; for(i=0;ik;i+) for(j=0;j121;j+); /=移位扫描显示函数=void led_dispy(uchar bu) uchar i; for(i=0;i0;i/=2) /shift bit for masking if (i & value) DATA=1; /masking value with i , write to SENSI-BUSelse DATA=0;SCK=1; /clk for SENSI-BUS_nop_();_nop_();_nop_(); /pulswith approx. 5 usSCK=0;DATA=1; /release DATA-lineSCK=1; /clk #9 for ackerror=DATA; /check ack (DATA will be pulled down by SHT11)SCK=0;return error; /error=1 in case of no acknowledge/-char s_read_byte(unsigned char ack)/-/读数据；unsigned char i,val=0;DATA=1; /release DATA-linefor (i=0x80;i0;i/=2) /shift bit for masking SCK=1; /clk for SENSI-BUSif (DATA) val=(val | i); /read bitSCK=0;DATA=!ack; /in case of ack=1 pull down DATA-LineSCK=1; /clk #9 for ack_nop_();_nop_();_nop_(); /pulswith approx. 5 usSCK=0;DATA=1; /release DATA-linereturn val;/-void s_transstart(void)/-/ generates a transmission start/ _ _/ DATA: |_|/ _ _/ SCK : _| |_| |_DATA=1; SCK=0; /Initial state_nop_();SCK=1;_nop_();DATA=0;_nop_();SCK=0;_nop_();SCK=1;_nop_();DATA=1;_nop_();SCK=0;/-void s_connectionreset(void)/-/ /启动传输/ _ _/ DATA: |_|/ _ _ _ _ _ _ _ _ _ _ _/ SCK : _| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_| |_unsigned char i;DATA=1; SCK=0; /Initial statefor(i=0;i9;i+) /9 SCK cycles SCK=1;SCK=0;s_transstart();/-char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)/-/ 进行温度或者湿度转换，由参数mode决定转换内容；unsigned error=0;unsigned int i;s_transstart(); /transmission startswitch(mode) /send command to sensorcase TEMP : error+=s_write_byte(MEASURE_TEMP); break;case HUMI : error+=s_write_byte(MEASURE_HUMI); break;default : break;for (i=0;i100)rh_true=100; /cut if the value is outside ofif(rh_true0.1)rh_true=0.1; /the physical possible range*p_temperature=t_C; /return temperature*p_humidity=rh_true; /return humidity%RH/-void main()/- uchar error,checksum;uint xunh;s_connectionreset(); while(1) xunh+;if(xunh=4000)xunh=0;error=0; error+=s_measure(unsigned char*) &shidu.i,&checksum,HUMI); /湿度测量 error+=s_measure(unsigned char*) &wendu.i,&checksum,TEMP); /温度测量 if(error!=0) s_connectionreset(); /如果发生错误，系统复位 else shidu.f=(float)shidu.i; /转换为浮点数 wendu.f=(float)wendu.i; /转换为浮点数 calc_sth11(&shidu.f,&wendu