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程序和原理圖如下,蜂鳴器一直響,LCD只亮不顯示,什么情況?
原理圖
程序:
- /*************定義接口********************
- P0------DB0~DB7 (LCD1602)
- P2.5------RS (LCD1602)
- P2.6------RW (LCD1602)
- P2.7------E (LCD1602)
- P3.5------SOUNDER (蜂鳴器)
- P3.6------SCK (SHT10) //時鐘
- P3.7------DATA (SHT10) //數(shù)據(jù)
- *****************************************/
- #include <AT89x52.h>
- #include <intrins.h>
- #include <math.h> //Keil library
- #include <stdio.h> //Keil library
- #define TEMPUP 24 //溫度上限, 達到該溫度蜂鳴器報警
- typedef unsigned char BYTE;
- typedef unsigned int WORD;
- typedef bit BOOL ;
- /*******************************************/
- sbit buzzer = P3^5; //蜂鳴器
- BOOL start;
- /******************************************/
- //************第一部分LCD1602設置******
- //START*************************************/
- #define LCD_DB P0
- sbit LCD_RS=P2^5; //P2^5是p2.5
- sbit LCD_RW=P2^6; //P2^6是p2.6
- sbit LCD_E=P2^7; //P2^7是p2.7
- /******定義函數(shù)****************/
- #define uchar unsigned char
- #define uint unsigned int
- void LCD_init(void); //初始化函數(shù)
- void LCD_write_command(uchar command); //寫指令函數(shù)
- void LCD_write_data(uchar dat); //寫數(shù)據(jù)函數(shù)
- void LCD_disp_char(uchar x,uchar y,uchar dat);//在某個屏幕位置上顯示一個字符,X(0-15),y(1-2)
- void LCD_disp_str(uchar x,uchar y,uchar *str); //LCD1602顯示字符串函數(shù)
- void delay_n10us(uint n); //延時函數(shù)
- /*--------------------------------------
- ;初始化LCD1602
- ;-------------------------------------*/
- void LCD_init(void)
- {
- delay_n10us(10);
- LCD_write_command(0x38);//設置8位格式,2行,5x7
- delay_n10us(10);
- LCD_write_command(0x0c);//整體顯示,關光標,不閃爍
- delay_n10us(10);
- LCD_write_command(0x06);//設定輸入方式,增量不移位
- delay_n10us(10);
- LCD_write_command(0x01);//清除屏幕顯示
- delay_n10us(100); //延時清屏,延時函數(shù),延時約n個10us
- }
- /*--------------------------------------
- ;LCD1602寫指令函數(shù)
- ;-------------------------------------*/
- void LCD_write_command(uchar dat)
- {
- delay_n10us(10);
- LCD_RS=0; //指令
- LCD_RW=0; //寫入
- LCD_E=1; //允許
- LCD_DB=dat;
- delay_n10us(10);
- LCD_E=0;
- delay_n10us(10);
- }
- /*--------------------------------------
- ;LCD1602寫數(shù)據(jù)函數(shù)
- ;-------------------------------------*/
- void LCD_write_data(uchar dat)
- {
- delay_n10us(10);
- LCD_RS=1; //數(shù)據(jù)
- LCD_RW=0; //寫入
- LCD_E=1; //允許
- LCD_DB=dat;
- delay_n10us(10);
- LCD_E=0;
- delay_n10us(10);
- }
- /*--------------------------------------
- ;LCD1602顯示一個字符函數(shù),在某個屏幕位置上顯示一個字符,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_command(address);
- LCD_write_data(dat);
- }
- /*--------------------------------------
- ;LCD1602顯示字符串函數(shù),在某個屏幕起始位置{X(0-15),y(1-2)}上顯示一個字符串
- ;-------------------------------------*/
- void LCD_disp_str(uchar x,uchar y,uchar *str)
- {
- uchar address;
- if(y==1)
- address=0x80+x;
- else
- address=0xc0+x;
- LCD_write_command(address);
- while(*str!='\0')
- {
- LCD_write_data(*str);
- str++;
- }
- }
- /*--------------------------------------
- ;延時函數(shù),延時約n個10us
- ;-------------------------------------*/
- void delay_n10us(uint n) //延時n個10us@12M晶振
- {
- uint i;
- for(i=n;i>0;i--)
- {
- _nop_();_nop_();_nop_();_nop_();_nop_();_nop_();
- }
- }
- //***************第一部分LCD1602設置*******
- //END****************************************
- //*************第二部分SHT10設置*************
- //START****************************************
- sbit SCK = P3^6; //定義通訊時鐘端口
- sbit DATA = P3^7; //定義通訊數(shù)據(jù)端口
- typedef union //定義了兩個共用體
- { unsigned int i;
- float f;
- }value;
- enum {TEMP,HUMI}; //TEMP=0,HUMI=1
- #define noACK 0 //用于判斷是否結束通訊
- #define ACK 1 //結束數(shù)據(jù)傳輸
- //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
- /****************定義函數(shù)****************/
- void s_transstart(void); //啟動傳輸函數(shù)
- void s_connectionreset(void); //連接復位函數(shù)
- char s_write_byte(unsigned char value);//SHT10寫函數(shù)
- char s_read_byte(unsigned char ack); //SHT10讀函數(shù)
- char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode);//測量溫濕度函數(shù)
- void calc_SHT10(float *p_humidity ,float *p_temperature);//溫濕度補償
- /*--------------------------------------
- ;啟動傳輸函數(shù)
- ;-------------------------------------*/
- void s_transstart(void)
- {
- DATA=1; SCK=0; //Initial state
- _nop_();
- SCK=1;
- _nop_();
- DATA=0;
- _nop_();
- SCK=0;
- _nop_();_nop_();_nop_();
- SCK=1;
- _nop_();
- DATA=1;
- _nop_();
- SCK=0;
- }
- /*--------------------------------------
- ;連接復位函數(shù)
- ;-------------------------------------*/
- void s_connectionreset(void)
- {
- unsigned char i;
- DATA=1; SCK=0;
- for(i=0;i<9;i++)
- {
- SCK=1;
- SCK=0;
- }
- s_transstart();
- }
- /*--------------------------------------
- ;SHT10寫函數(shù)
- ;-------------------------------------*/
- char s_write_byte(unsigned char value)
- {
- unsigned char i,error=0;
- for (i=0x80;i>0;i/=2) //shift bit for masking
- {
- if (i & value) DATA=1; //masking value with i , write to SENSI-BU
- else DATA=0;
- SCK=1; //clk for SENSI-BUS
- _nop_();_nop_();_nop_(); //pulswith approx. 3 us
- SCK=0;
- }
- DATA=1; //release DATA-line
- SCK=1; //clk #9 for ack
- error=DATA; //check ack (DATA will be pulled down by SHT11),DATA在第9個上升沿將被SHT10自動下拉為低電
- _nop_();_nop_();_nop_();
- SCK=0;
- DATA=1; //release DATA-line
- return error; //error=1 in case of no acknowledge //返回:0成功,1失敗
- }
- /*--------------------------------------
- ;SHT10讀函數(shù)
- ;-------------------------------------*/
- char s_read_byte(unsigned char ack)
- {
- unsigned char i,val=0;
- DATA=1;
- for (i=0x80;i>0;i/=2)
- { SCK=1;
- if (DATA) val=(val | i);
- _nop_();_nop_();_nop_();
- SCK=0;
- }
- if(ack==1)DATA=0;
- else DATA=1; //如果是校驗(ack==0),讀取完后結束通訊
- _nop_();_nop_();_nop_();
- SCK=1;
- _nop_();_nop_();_nop_();
- SCK=0;
- _nop_();_nop_();_nop_();
- DATA=1;
- return val;
- }
- /*--------------------------------------
- ;測量溫濕度函數(shù)
- ;-------------------------------------*/
- char s_measure(unsigned char *p_value, unsigned char *p_checksum, unsigned char mode)
- {
- unsigned error=0;
- unsigned int i;
- s_transstart();
- switch(mode)
- {
- case TEMP : error+=s_write_byte(MEASURE_TEMP); break;
- case HUMI : error+=s_write_byte(MEASURE_HUMI); break;
- default : break;
- }
- for (i=0;i<65535;i++)
- if(DATA==0) break;
- if(DATA) error+=1;
- *(p_value) =s_read_byte(ACK);
- *(p_value+1)=s_read_byte(ACK);
- *p_checksum =s_read_byte(noACK);
- return error;
- }
- /*--------------------------------------
- ;溫濕度補償函數(shù)
- ;-------------------------------------*/
- void calc_SHT10(float *p_humidity ,float *p_temperature)
- { const float C1=-4.0;
- const float C2=+0.0405;
- const float C3=-0.0000028;
- const float T1=+0.01;
- const float T2=+0.00008;
- float rh=*p_humidity;
- float t=*p_temperature;
- float rh_lin;
- float rh_true;
- float t_C;
- t_C=t*0.01 - 40;
- rh_lin=C3*rh*rh + C2*rh + C1;
- rh_true=(t_C-25)*(T1+T2*rh)+rh_lin;
- if(rh_true>100)rh_true=100;
- if(rh_true<0.1)rh_true=0.1;
- *p_temperature=t_C;
- *p_humidity=rh_true;
- }
- //**********第二部分SHT10設置***************
- //END****************************************
- //*********主函數(shù)*****************
- void main(void)
- {
- value humi_val,temp_val;
- unsigned char error,checksum;
- unsigned int wendu,shidu;
- LCD_init();
- s_connectionreset();
- LCD_disp_str(0,1,"TE ");
- LCD_disp_str(0,2,"RH ");
- //*********初始化溫度顯示區(qū)*********
- LCD_disp_str(2,1,"TTT.T C");
- //*********初始化濕度顯示區(qū)*********
- LCD_disp_str(2,2,"RRR.R%");
- delay_n10us(20000); //延時0.2s
- while(1)
- { error=0;
- error+=s_measure((unsigned char*) &humi_val.i,&checksum,HUMI);
- error+=s_measure((unsigned char*) &temp_val.i,&checksum,TEMP);
- if(error!=0) s_connectionreset();
- else
- { humi_val.f=(float)humi_val.i;
- temp_val.f=(float)temp_val.i;
- calc_SHT10(&humi_val.f,&temp_val.f);
- wendu=10*temp_val.f;
- LCD_disp_char(2,1,wendu/1000+'0'); //顯示溫度百位
- LCD_disp_char(3,1,(wendu%1000)/100+'0'); //顯示溫度十位
- LCD_disp_char(4,1,(wendu%100)/10+'0'); //顯示溫度個位
- LCD_disp_char(6,1,(wendu%10)+'0'); //顯示溫度小數(shù)點后第一位
- shidu=10*humi_val.f;
- LCD_disp_char(2,2,shidu/1000+'0'); //顯示濕度百位
- LCD_disp_char(3,2,(shidu%1000)/100+'0'); //顯示濕度十位
- LCD_disp_char(4,2,(shidu%100)/10+'0'); //顯示濕度個位
- LCD_disp_char(6,2,(shidu%10)+'0'); //顯示濕度小數(shù)點后第一位
- }
- delay_n10us(80000); //延時約0.8s }
- }
- }
復制代碼
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