- #include <reg52.h>
- #include <intrins.h>
- /************????**************/
- sbit RX = P3 ^ 1; //ECH0
- sbit TX = P3 ^ 0;//TRIG
- sbit CS = P2 ^ 0;
- sbit SID = P2 ^ 1; //RW
- sbit SCLK = P2 ^ 3; //E
- /*************????**************/
- void Lcd_init(void);
- void Write_char(bit start, unsigned char ddata);
- void Send_byte(unsigned char bbyte);
- void Delaynms(unsigned int di);
- void Clr_Scr(void);
- void LCD_set_xy( unsigned char x, unsigned char y );
- void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s);
- void LCD_Write_number(unsigned char s);
- void Lcd_Mark2(void);
- void Conut(void);
- void delayms(unsigned int ms);
- void StartModule();
- unsigned char code num[]={"0123456789 :.-"};
- unsigned char code Q[] ={"Ç°:"};
- unsigned char code CM[] = {"m"};
- unsigned int time=0;
- long S=0;
- bit flag =0;
- unsigned char disbuff[4]={ 0,0,0,0,};
- /**************************************************************/
- void Lcd_init(void)
- {
- Delaynms(10);
- CS=1;
- Write_char(0,0x30);
- Write_char(0,0x0c);
- Write_char(0,0x01);
- }
- /***************************************************************/
- void Write_char(bit start, unsigned char ddata)
- {
- unsigned char start_data,Hdata,Ldata;
- if(start==0)
- start_data=0xf8;
- else
- start_data=0xfa;
- Hdata=ddata&0xf0;
- Ldata=(ddata<<4)&0xf0;
- Send_byte(start_data);
- Delaynms(5);
- Send_byte(Hdata);
- Delaynms(1);
- Send_byte(Ldata);
- Delaynms(1);
- }
- /***************************************************************/
- void Send_byte(unsigned char bbyte)
- {
- unsigned char i;
- for(i=0;i<8;i++)
- {
- SID=bbyte&0x80;
- SCLK=1;
- SCLK=0;
- bbyte<<=1;
- }
- }
- /***************************************************************/
- void Delaynms(unsigned int di)
- {
- unsigned int da,db;
- for(da=0;da<di;da++)
- for(db=0;db<10;db++);
- }
- /***************************************************************/
- void Clr_Scr(void)
- {
- Write_char(0,0x01);
- }
- /****************************************************************/
- void LCD_set_xy( unsigned char x, unsigned char y )
- {
- unsigned char address;
- switch(x)
- {
- case 0: address = 0x80 + y; break;
- case 1: address = 0x80 + y; break;
- case 2: address = 0x90 + y; break;
- case 3: address = 0x88 + y; break;
- case 4: address = 0x98 + y; break;
- default:address = 0x80 + y; break;
- }
- Write_char(0, address);
- }
- /*****************************************************************/
- void LCD_Write_string(unsigned char X,unsigned char Y,unsigned char *s)
- {
- LCD_set_xy( X, Y );
- while (*s)
- {
- Write_char( 1, *s );
- s ++;
- Delaynms(1);
- }
- }
- /******************************************************************/
- void LCD_Write_number(unsigned char s)
- {
- Write_char(1,num[s]);
- Delaynms(1);
- }
- /******************************************************************/
- void Lcd_Mark2(void)
- {
- Clr_Scr();//??
- LCD_Write_string(1,2,Q);
- LCD_Write_string(1,6,CM);
- }
- /*************************************************************************************/
- /*************************************************************************************/
- void Conut(void)
- {
- time=TH0*256+TL0;
- TH0=0;
- TL0=0;
- S=time*1.87/100;
- if(flag==1)
- {
- flag=0;
- LCD_set_xy( 1, 4 );
- LCD_Write_number(13);
- LCD_Write_number(12);
- LCD_set_xy( 1, 5 );
- LCD_Write_number(13);
- LCD_Write_number(13);
- }
- else
- {
- disbuff[1]=S%1000/100;
- disbuff[2]=S%1000%100/10;
- disbuff[3]=S%1000%10 %10;
- LCD_set_xy( 1, 4 );
- LCD_Write_number(disbuff[1]);
- LCD_Write_number(12);
- LCD_set_xy( 1, 5 );
- LCD_Write_number(disbuff[2]);
- LCD_Write_number(disbuff[3]);
- }
- }
- /********************************************************/
- void delayms(unsigned int ms)
- {
- unsigned char i=100,j;
- for(;ms;ms--)
- {
- while(--i)
- {
- j=10;
- while(--j);
- }
- }
- }
- /********************************************************/
- void zd0() interrupt 1
- {
- flag=1;
- }
- /********************************************************/
- void StartModule()
- {
- TX=1;
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- _nop_();
- TX=0;
- }
- /********************************************************/
- void main(void)
- {
- TMOD=0x01;
- TH0=0;
- TL0=0;
- TR0=1;
- Lcd_init();
- Clr_Scr();
- Lcd_Mark2();
- while(1)
- {
- StartModule();
- while(!RX);
- TR0=1;
- while(RX);
- TR0=0;
- Conut();
- delayms(80); //80MS
- }
- }
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