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[LPC] 用的lpc2148，写了一个温湿度sht75显示在lcd1602上的程序...

2013-11-30 14:28:12 3829

0 #include #include #define uint16 unsigned short int #define uchar unsigned char #define uint unsigned int #define RS_SET IO0SET=1<<8 #define rs_clr="RS_CLR" io0clr="1<<8 #define" rw_set="RW_SET" io0set="1<<9 #define" rw_clr="RW_CLR" io0clr="1<<9 #define" en_set="EN_SET" io0set="1<<10 #define" en_clr="EN_CLR" io0clr="1<<10 #define" DataPort(Y) io0set="Y" typedef union="union" { unsigned="unsigned" int="int" i; //定义了两个共用体 float="float" f; } value; enum { TEMP,HUMI}; //void delay1(unsigned int="int" t) //{ //unsigned int="int" temp="2100; " //for(;t>0;t--) // for(;temp>0;temp--); //} void delay1(void) { int a=3000; while(a--); } void LCD_Write_Com(unsigned char com) { delay1(); RS_CLR; RW_CLR; EN_SET; DataPort(com); delay1(); EN_CLR; IO0CLR=0xff; } void LCD_Write_Data(unsigned char Data) { delay1(); RS_SET; RW_CLR; EN_SET; DataPort(Data); delay1(); EN_CLR; IO0CLR=0xff; } /* * -------------------------------------- * ;模块名称CD_init(); * ;功能:初始化LCD1602 * ;------------------------------------- / void LCD_Init(void) { LCD_Write_Com(0x38); /显示模式设置/ delay1(); LCD_Write_Com(0x38); delay1(); LCD_Write_Com(0x38); delay1(); LCD_Write_Com(0x38); LCD_Write_Com(0x08); /显示关闭/ LCD_Write_Com(0x01); /显示清屏/ LCD_Write_Com(0x06); /显示光标移动设置/ delay1(); LCD_Write_Com(0x0C); /显示开及光标设置/ } /* * -------------------------------------- * ;模块名称CD_disp_char(); * ;功能CD1602显示一个字符函数，在某个屏幕位置上显示一个字符,X（0-15),y(1-2)。 * ;------------------------------------- / void LCD_disp_char(uchar x, uchar y, uchar dat) { uchar address; if (y == 1) address = 0x80 + x; else address = 0xc0 + x; LCD_Write_Com(address); LCD_Write_Data(dat); } /* * -------------------------------------- * ;模块名称CD_disp_str(); * ;功能CD1602显示字符串函数，在某个屏幕起始位置{X（0-15),y(1-2)}上显示一个字符串。 * ;------------------------------------- / void LCD_disp_str(uchar x, uchar y, uchar str) { uchar address; if (y == 1) address = 0x80 + x; else address = 0xc0 + x; LCD_Write_Com(address); while (* str != '') // while (str) { LCD_Write_Data( str); str++; } } /----------------------------------------------------------------------------/ #define CLK_SHT 0x00008000//p0.15 #define DAT_SHT 0x00004000//p0.14 //typedef union { // unsigned int i; //定义了两个共用体 // float f; //} //value; //enum { // TEMP,HUMI}; //分别对应温度OR湿度测量 #define noACK 0 //是否发送应答 #define ACK 1 //adr command r/w #define STATUS_REG_W 0x06 //000 0011 0 #define STATUS_REG_R 0x07 //000 0011 1 #define MEASURE_TEMP 0x03 //000 0001 1 #define MEASURE_HUMI 0x05 //000 0010 1 #define RESET 0x1e //000 1111 0 void s_transstart(void) { PINSEL0=PINSEL0&0x00000000; IO0DIR\|=DAT_SHT;IO0DIR\|=CLK_SHT; IO0SET=DAT_SHT; IO0CLR=CLK_SHT; delay1(); IO0SET=CLK_SHT; delay1(); IO0CLR=DAT_SHT; delay1(); IO0CLR=CLK_SHT; delay1(); IO0SET=CLK_SHT; delay1(); IO0SET=DAT_SHT; delay1(); IO0CLR=CLK_SHT; delay1(); } void s_connectionreset(void) //---------------------------------------------------------------------------------- // 连接复位; // _____________________________________________________ ________ // DATA: \|_______\| // _ _ _ _ _ _ _ _ _ ___ ___ // SCK : __\| \|__\| \|__\| \|__\| \|__\| \|__\| \|__\| \|__\| \|__\| \|______\| \|___\| \|______ { unsigned char i; PINSEL0 =PINSEL0&(~DAT_SHT)&(~CLK_SHT); IO0DIR\|=DAT_SHT;IO0DIR\|=CLK_SHT; IO0SET=DAT_SHT; IO0CLR=CLK_SHT; delay1(); //准备 for(i=0;i<9;i++) //DATA保持高，SCK时钟触发9次，发送启动传输，通讯即复位 { io0set="CLK_SHT; " delay1(); io0clr="CLK_SHT; " delay1(); } s_transstart(); } long s_write_byte(unsigned char="char" value) //---------------------------------------------------------------------------------- // 写字节函数 { unsigned="unsigned" char="char" i; l="l" error="0; " pinsel0="PINSEL0&0x00000000; " //IO0DIR\|=DAT_SHT; //delay1(); for="for" (i=0x80;i>0;i/=2) //高位为1，循环右移 { if (i & value) IO0SET=DAT_SHT; //和要发送的数相与，结果为发送的位 else IO0CLR=DAT_SHT; IO0SET=CLK_SHT; delay1(); IO0CLR=CLK_SHT; delay1(); } IO0SET=DAT_SHT; //release DATA-line IO0SET=CLK_SHT; //clk #9 for ack //IO0DIR&=~( 1 << 14); IO0DIR&=~DAT_SHT; //delay1(); //error=(IO0PIN & 0x4000); //check ack (DATA will be pulled down by DHT90),DATA在第9个上升沿将被DHT90自动下拉为低电平。 error=(IO0PIN & DAT_SHT); delay1(); IO0CLR=CLK_SHT; delay1(); // IO0DIR\|=( 1 << 14); IO0DIR\|=DAT_SHT; IO0SET=DAT_SHT; //release DATA-line return error; //error=1 in case of no acknowledge //返回：0成功，1失败 } char s_read_byte(unsigned char ack) { unsigned char i,val=0; PINSEL0=PINSEL0&0x00000000; //IO0DIR&=~( 1 << 14); //release DATA-line IO0DIR&=~DAT_SHT; IO0SET=DAT_SHT; for (i=0x80;i>0;i/=2) //shift bit for masking { IO0SET=CLK_SHT; //clk for SENSI-BUS if (IO0PIN & 0x4000) val=(val \| i); //read bit delay1(); IO0CLR=CLK_SHT; delay1(); } //IO0DIR\|=( 1 << 14); IO0DIR\|=DAT_SHT; if(ack==1)IO0CLR=DAT_SHT; //in case of "ack==1" pull down DATA-Line else IO0SET=DAT_SHT; //如果是校验(ack==0)，读取完后结束通讯 delay1(); IO0SET=CLK_SHT; //clk #9 for ack delay1(); IO0CLR=CLK_SHT; delay1(); IO0SET=DAT_SHT; //release DATA-line return val; } //---------------------------------------------------------------------------------- uchar s_softreset(void) //---------------------------------------------------------------------------------- // resets the sensor by a softreset { uchar error=0; s_connectionreset(); //reset communication error+=s_write_byte(RESET); //send RESET-command to sensor return error; //error=1 in case of no response form the sensor } //---------------------------------------------------------------------------------- uchar s_read_statusreg( uchar p_value, uchar p_checksum) //---------------------------------------------------------------------------------- // reads the status register with checksum (8-bit) { uchar error=0; s_transstart(); //transmission start error=s_write_byte(STATUS_REG_R); //send command to sensor p_value=s_read_byte(ACK); //read status register (8-bit) p_checksum=s_read_byte(noACK); //read checksum (8-bit) return error; //error=1 in case of no response form the sensor } //---------------------------------------------------------------------------------- uchar s_write_statusreg( uchar p_value) //---------------------------------------------------------------------------------- // writes the status register with checksum (8-bit) { uchar error=0; s_transstart(); //transmission start error+=s_write_byte(STATUS_REG_W);//send command to sensor error+=s_write_byte(p_value); //send value of status register return error; //error>=1 in case of no response form the sensor } char s_measure(unsigned char * p_value, unsigned char * p_checksum, unsigned char mode) { // makes a measurement (humidity/temperature) with checksum unsigned error = 0; unsigned int i; s_transstart(); //transmission start switch (mode) { // send command to sensor case TEMP : error += s_write_byte(MEASURE_TEMP); break; case HUMI : error += s_write_byte(MEASURE_HUMI); break; default : break; } IO0DIR&=~DAT_SHT; for (i = 0;i < 65535;i++) { error=IO0PIN&DAT_SHT; if (error==0) break;} //wait until sensor has finished the measurement if (error) error += 1; // or timeout (~2 sec.) is reached * (p_value) = s_read_byte(ACK); //read the first byte (MSB) * (p_value + 1) = s_read_byte(ACK); //read the second byte (LSB) * p_checksum = s_read_byte(noACK); //read checksum (p_value) =s_read_byte(ACK); //read the first byte (MSB) (p_value+1)=s_read_byte(ACK); //read the second byte (LSB) p_checksum =s_read_byte(noACK); //read checksum return error; } //---------------------------------------------------------------------------------------- void calc_sht75(float p_humidity ,float p_temperature) //void calc_sht75() { //---------------------------------------------------------------------------------------- // calculates temperature [癈] and humidity [%RH] // input : humi [Ticks] (12 bit) // temp [Ticks] (14 bit) // 温湿度转换公式 //Temperature = d1+d2 temp[Ticks] //RH_lin = c1 + c2SO + c3 humi[Ticks] //RH_true = (T - 25)(t + t humi[Ticks] ) + RH_lin const float C1=-4.0; // for 12 Bit const float C2=+0.0405; // for 12 Bit const float C3=-0.0000028; // for 12 Bit const float T1=+0.01; // for 14 Bit @ 5V const float T2=+0.00008; // for 14 Bit @ 5V float rh=p_humidity; // rh: Humidity [Ticks] 12 Bit float t=p_temperature; // t: Temperature [Ticks] 14 Bit float rh_lin; // rh_lin: Humidity linear float rh_true; // rh_true: Temperature compensated humidity float t_C; // t_C : Temperature [癈] t_C=t0.01 - 40; //calc. temperature from ticks to [癈] rh_lin=C3rhrh + C2rh + C1; //calc. humidity from ticks to [%RH] rh_true=(t_C-25)(T1+T2rh)+rh_lin; //calc. temperature compensated humidity [%RH] if(rh_true>100)rh_true=100; //cut if the value is outside of if(rh_true<0.1)rh_true=0.1; //the physical possible range p_temperature=t_C; //return temperature [癈] p_humidity=rh_true; //return humidity[%RH] } //float calc_dewpoint(float h,float t) { //-------------------------------------------------------------------- //calculates dew point // input: humidity [%RH], temperature [癈] // output: dew point [癈] //float logEx,dew_point; //logEx=0.66077+7.5t/(237.3+t)+(log10(h)-2); //dew_point = (logEx - 0.66077)237.3/(0.66077+7.5-logEx); //return dew_point; //} void main() { value humi_val, temp_val; unsigned char error, checksum; unsigned int shidu,wendu; pinsel0="0x00; " //PINSEL1=0x00; io0dir="0xfff; " LCD_Init(); PINSEL0 =PINSEL0&(~DAT_SHT)&(~CLK_SHT); //PINSEL0 =PINSEL0&0x00000000; s_connectionreset(); LCD_disp_str(0, 1, "TE"); LCD_disp_str(0, 2, "RH"); // *******初始化温度显示区***** LCD_disp_str(2, 1, "TTT.TC"); // *****初始化湿度显示区******* LCD_disp_str(2, 2, "RRR.R%"); delay1(); while(1) {error = 0; error += s_measure((unsigned char ) &humi_val . i, &checksum, HUMI); //measure humidity error += s_measure((unsigned char ) &temp_val . i, &checksum, TEMP); //measure temperature if (error != 0) s_connectionreset(); //in case of an error: connection reset else { humi_val . f = (float)humi_val . i; //converts integer to float temp_val . f = (float)temp_val . i; //converts integer to float calc_sht75(&humi_val . f, &temp_val . f);//calculate humidity, temperature wendu = (int)(10 * temp_val . f); LCD_disp_char(2, 1, wendu/1000+'0'); //显示温度百位 LCD_disp_char(3, 1, (wendu % 1000) / 100 + '0'); //显示温度十位 LCD_disp_char(4, 1, (wendu % 100) / 10 + '0'); //显示温度个位 LCD_disp_char(6, 1, (wendu % 10) + '0'); //显示温度小数点后第一位 shidu = (int)(10 * humi_val . f); LCD_disp_char(2, 2, shidu / 1000 + '0'); //显示湿度百位 LCD_disp_char(3, 2, (shidu % 1000) / 100 + '0'); //显示湿度十位 LCD_disp_char(4, 2, (shidu % 100) / 10 + '0'); //显示湿度个位 LCD_disp_char(6, 2, (shidu % 10) + '0'); //显示湿度小数点后第一位 } delay1(); } } 0
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