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how to pass value to lcd?

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lizxay

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Hi everyone, I have written my coding to count the revolution per minute of a motor, does anyone know how to pass the counted value to lcd? how to write it ? my coding is below, i really need u guys help, thanks a lot, if u guys feel it's too long, u can straight jump to the void value() part, it's that part i need help =)


#include<pic.h>
__CONFIG(0x3f18);
//__CONFIG_DEBUG_0FF&_CP_ALI&_WRT_HALF&_CPD_ON&_LVP_0FF&_BODKN_OFF&_PWRTE_ON&_WDT_OFF&_HS_OSC

#define rs RA0
#define rw RA2
#define e RA1

const char label[]={' ','S','P','E','E','D',':'};

const char unit[]={'R','P','M',' '};

void start();
void delayloop();

void init(); //I/O port initialize function declare
void lcd_init(); //LCD init
void write_label();
void write_unit();
void write(char x); //display one byte
void lcd_enable(); //LCD display setting
void delay(); //delay

void main(){
while(1){

start();
RA2=1;
init();
lcd_init();
write_label();
PORTB=0xC0; //set the 2nd line display address
write_unit();
lcd_enable(); //LCD display setting
}
}
void start(){
int timerstart,timerstop,count,duration,rpm;
STATUS=STATUS&0b00100000;
TRISA=0x04;
TRISB=0x00;

T1CON=0b00101101;

STATUS=STATUS&0b00000000;
PORTA=0x00;
PORTB=0x00;

start:
if(PORTA&0b00000100){
goto input;
}
else{
goto start;
}

input:
timerstart=TMR1H;
delayloop();

start2:
if(PORTA&0b00000100){
goto input2;
}
else{
goto start2;
}

input2:
timerstop=TMR1H;
delayloop();

if(timerstop > timerstart){
duration=timerstop-timerstart;
}

else{
duration= timerstop + 60 - timerstart;
}

rpm=60/duration;

}


void delayloop()
{
int i;
for(i=0;i<5000;i++);
}

//initialize I/O

void init()
{
CMCON=0x07;
TRISA=0x00;
TRISB=0x00;
}
//-------------------------------------------------------
//LCD init

void lcd_init()
{
PORTB=0x1; //clear screen
lcd_enable();
PORTB=0x38; //8 bits 2 lines 5*7 mode
lcd_enable();
PORTB=0x0e; //display on, cursor on, blink on
lcd_enable();
PORTB=0x06; //character not move, cursor rotate right
lcd_enable();
PORTB=0x80; //www.ahchye.com
lcd_enable();
}

//--------------------------------------------------------------

void write_label()
{
int i;
for(i=0;i<0x07;i++)
{
write(label); //search table
}
}

void write_value()
{

"THIS PART IS TO WRITE AND PASS THE RPM VALUE"
}

void write_unit()
{
int i;
for(i=12;i<0x0F;i++)
{
write(unit);
}
}



//--------------------------------------------------------------
//write a byte to led
void write (char x)
{
PORTB=x; //data send to PORTB
rs=1; //is data not command
rw=0; //is write not read
e=0; //pull low enable signal
delay(); //for a while
e=1; //pull high to build the rising edge
}

//lcd display setting
void lcd_enable()
{
rs=0; //is command not data
rw=0; //is write not read
e=0; //pull low enagle signal
delay(); //for while
e=1; //pull high to build the rising edge
}

//-----------------------------------------------
//delay
void delay()
{
int i;
for(i=0;i<5000;i++);
}
 

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