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標題: 數(shù)碼管超聲波 [打印本頁]

作者: Cindy20 時間: 2022-6-8 16:53
標題: 數(shù)碼管超聲波

#include <pic.h>

#include <stdio.h>

__CONFIG(0x3b32);

#define trig RB0

#define echo RB1

void clrscn(void); // prototypes

void cursor(char pos);

void print(char *p);

void setup(void);

unsigned int get_srf04(void);

char s[21]; // buffer used to hold text to print

void main(void)

{

unsigned int range;

setup(); // sets up the PIC16F877 I2C port

clrscn(); // clears the LCD03 disply

cursor(2); // sets cursor to 1st row of LCD03

sprintf(s,"SRF04 Ranger Test"); // text, printed into our buffer

print(s); // send it to the LCD03

while(1) { // loop forever

range = get_srf04(); // get range from srf04 (round trip flight time in 0.8uS units)

cursor(24); // sets cursor to 2nd row of LCD03

sprintf(s,"Range = %dcm ", range/72); // convert to cm

print(s); // send it to the LCD03

cursor(44); // sets cursor to 3rd row of LCD03

sprintf(s,"Range = %dinch ", range/185); // convert to inches

print(s); // send it to the LCD03

TMR1H = 0; // 52mS delay - this is so that the SRF04 ranging is not too rapid

TMR1L = 0; // and the previous pulse has faded away before we start the next one

T1CON = 0x21; // 1:4 prescale and running

TMR1IF = 0;

while(!TMR1IF); // wait for delay time

TMR1ON = 0; // stop timer

}

unsigned int get_srf04(void)

{

TMR1H = 0xff; // prepare timer for 10uS pulse

TMR1L = -14;

T1CON = 0x21; // 1:4 prescale and running

TMR1IF = 0;

trig = 1; // start trigger pulse

while(!TMR1IF); // wait 10uS

trig = 0; // end trigger pulse

TMR1ON = 0; // stop timer

TMR1H = 0; // prepare timer to measure echo pulse

TMR1L = 0;

T1CON = 0x20; // 1:4 prescale but not running yet

TMR1IF = 0;

while(!echo && !TMR1IF); // wait for echo pulse to start (go high)

TMR1ON = 1; // start timer to measure pulse

while(echo && !TMR1IF); // wait for echo pulse to stop (go low)

TMR1ON = 0; // stop timer

return (TMR1H<<8)+TMR1L; // TMR1H:TMR1L contains flight time of the pulse in 0.8uS units

}

void clrscn(void)

{

SEN = 1; // send start bit

while(SEN); // and wait for it to clear

SSPIF = 0;

SSPBUF = 0xc6; // LCD02 I2C address

while(!SSPIF); // wait for interrupt

SSPIF = 0; // then clear it.

SSPBUF = 0; // address of register to write to

while(!SSPIF); //

SSPIF = 0; //

SSPBUF = 12; // clear screen

while(!SSPIF); //

SSPIF = 0; //

SSPBUF = 4; // cursor off

while(!SSPIF); //

SSPIF = 0; //

PEN = 1; // send stop bit

while(PEN); //

}

void cursor(char pos)

{

SEN = 1; // send start bit

while(SEN); // and wait for it to clear

SSPIF = 0;

SSPBUF = 0xc6; // LCD02 I2C address

while(!SSPIF); // wait for interrupt

SSPIF = 0; // then clear it.

SSPBUF = 0; // address of register to write to

while(!SSPIF); //

SSPIF = 0; //

SSPBUF = 2; // set cursor

while(!SSPIF); //

SSPIF = 0; //

SSPBUF = pos; //

while(!SSPIF); //

SSPIF = 0; //

PEN = 1; // send stop bit

while(PEN); //

}

void print(char *p)

{

SEN = 1; // send start bit

while(SEN); // and wait for it to clear

SSPIF = 0;

SSPBUF = 0xc6; // LCD02 I2C address

while(!SSPIF); // wait for interrupt

SSPIF = 0; // then clear it.

SSPBUF = 0; // address of register to write to

while(!SSPIF); //

SSPIF = 0; //

while(*p) {

SSPBUF = *p++; // write the data

while(!SSPIF); //

SSPIF = 0; //

}

PEN = 1; // send stop bit

while(PEN); //

}

void setup(void)

{

unsigned long x;

TRISB = 0xfe; // RB0 (trig) is output

PORTB = 0xfe; // and starts low

TRISC = 0xff;

PORTC = 0xff;

SSPSTAT = 0x80;

SSPCON = 0x38;

SSPCON2 = 0x00;

SSPADD = 50; // SCL = 91khz with 20Mhz Osc

for(x=0; x<300000L; x++); // wait for LCD03 to initialise

}

5717-數(shù)碼管超聲波--普通--OK.7z

13.09 MB, 下載次數(shù): 11, 下載積分: 黑幣 -5

作者: tplin 時間: 2022-11-30 10:07
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