8051 gps interfacing code
Discussion in "8051 Discussion Forum" started by cjj20 Jan 10, 2018.
Wed Jan 10 2018, 01:02 am
Please help me correct this code
#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#define LCD_DATA PORTC;
#define F_CPU 12000000UL
#define ctrl PORTB;
#define USART_BAUDRATE 4800
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
#define rs PB0; //register select
#define rw PB1; // LCD read/Write
#define en PB2; // enable print
void lcd_init();
void lcdcmd(unsigned char);
void lcddata(unsigned char);
void delay(int);
void drawstring(unsigned char *stri);
unsigned int receiveserial();
void uart_init();
void checkgpgga();
unsigned char send[90];
unsigned char send2[90];
unsigned char data;
unsigned char lat[15];
unsigned char long[15];
unsigned char lati;
unsigned char longi;
int main()
{
DDRC=0xff; //output
DDRB=0x07;
lcd_init();
delay(50);
uart_init();
while(1){
receiveserial();
checkgpgga();
}
return 0;
}
void uart_init()
{
UBRRL = BAUD_PRESCALE;
UBRRH = (BAUD_PRESCALE >
>
8);
UCSRB |= (1<<RXCIE) | (1 << RXEN) | (1 << TXEN);
UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1);
}
void lcdcmd(unsigned char n)
{
LCD_DATA=n;
ctrl =(0<<rs)|(0<<rw)|(1<<en);
delay(1);
ctrl =(0<<rs)|(0<<rw)|(0<<en);
return;
}
void lcddata(unsigned char n)
{
LCD_DATA=n;
ctrl = (1<<rs)|(0<<rw)|(1<<en);
delay(1);
ctrl = (1<<rs)|(0<<rw)|(0<<en);
return;
}
void lcd_init()
{
lcdcmd(0x38); //2 line matrix
delay(50);
lcdcmd(0x01); //clear lcd
delay(50);
lcdcmd(0x0E); // cursor start
delay(50);
lcdcmd(0x80); //cursor begins at line 1
delay(50);
return;
}
unsigned int receiveserial()
{
while(!(UCSRA) & (1<<RXC));
return UDR;
}
void drawstring(unsigned char *stri)
{
unsigned char stri;
int j;
while(stri[j]!='\0')
{
lcddata(stri[j]);
j++;
}
return;
}
void checkgpgga()
{
int i;
int j;
data=receiveserial();
if(data=='$')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial()
if(data=='P')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial();
if(data=='A')
{
data-receiveserial();
if(data==',')
{
data=receiveserial();
while(data!=',')
{
data=receiveserial();
}
while(data!=',')
{
data=receiveserial();
}
lat[0]=receiveserial();
data=lat[0];
for(i=0;data!=',';i++)
{
lat[i]=receiveserial();
data=lat[i];
}
lati=receiveserial();
data=receiveserial();
while(data!=',')
{
data=receiveserial();
}
long[0]=receiveserial();
data=long[0];
for(i=1;data!=',';i++)
{
long[i]=receiveserial();
data=long[i];
}
longi=receiveserial();
lcdcmd(0x01);
delay(1);
lcdcmd(0x80);
delay(1000);
i=0;
while(lat[i]!='\0')
{
lcddata(lat[j]);
j++;
}
lcddata(lati);
lcdcmd(0xC0);
delay(1000);
i=0;
while(long[i]!='\0')
{
lcddata(long[i]);
i++;
}
lcddata(longi);
delay(1000);
}
}
}
}
}
}
}
}
}
void delay(unsigned int times)
{
unsigned int i;
unsigned int j;
for(i=0;i<times;i++)
for(j=0;j<1275;j++);
}
Wed Jan 10 2018, 01:12 am
I just think something is off in the checkgpgga function. That was the avr version. I have attached my 8051 version below which definitely has issues in the printing the latitude and longitude correctly.
#include <stdio.h>
#include <reg51.h>
#define lcdport P2;
//sfr lcd_data_pin=0xa0;
#define lcdport P2;
sbit rs=P3^0; //register select
sbit rw=P3^1; // LCD read/Write
sbit en=P3^2; // enable print
void lcd_init();
void lcdcmd(unsigned char);
void lcddata(unsigned char);
void delay(int);
void drawstring(unsigned char *stri);
void receiveserial(unsigned char);
void uart_init();
void checkgpgga();
void latitude();
void longitude();
unsigned char send[90];
unsigned char send2[90];
unsigned char data;
unsigned char lat[i];//??
char checking[6]={"GPGGA"};
int main()
{
uart_init();
lcd_init();
while(1){
receiveserial();
checkgpgga();
latitude();
longitdude();
}
return 0;
}
void uart_init()
{
IE=0x00;
SCON=0x50; // receiving enabled
TMOD=0x20; // timer 1 auto reload
TH1=0xfd;// value loaded to timer, baud rate 9600bps
TR1=1; //timer 1 start
IE=0x90; // enable serial interrupt
}
void lcdcmd(unsigned char n)
{
lcdport=n;
rw=0;
rs=0;
en=1;
delay(1);
en=0;
}
void lcddata(unsigned char n)
{
lcdport=n;
rs=1;
rw=0;
en=1;
delay(1);
en=0;
}
void lcd_init()
{
lcdcmd(0x38); //2 line matrix
delay(50);
lcdcmd(0x0F); //cursor blinking
delay(50);
lcdcmd(0x01); // clears lcdcmd
delay(50);
lcdcmd(0x80); //cursor begins at line 1
delay(50);
}
void receiveserial()
{
while(RI==0);
send2[i]=send2[90];
send2[i++]=SBUF;
RI=0;
return (send2);
}
void checkgpgga()
{
data=receiveserial();
if(data=='$')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial()
if(data=='P')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial();
if(data=='G')
{
data=receiveserial();
if(data=='A')
{
data-receiveserial();
if(data==',')
{
data=receiveserial();
while(data!=',')
{
data=receiveserial();
}
while(data!=',')
{
data=receiveserial();
}
lat[0]=receiveserial();
data=lat[0];
for(i=0;data!=',';i++)
{
lat[i]=receiveserial();
data=lat[i];
}
}
}
}
}
}
}
}
}
void latitude()
{
int i;
lcdcmd(0x01); //clear LCD display
lcdcmd(0x84); //move cursor to position 6 of line 1
drawstring("Latitude:");
lcdcmd(0xC0); //beginning of second line
lcddata(lat[i+1]);
lcddata(lat[i+2]);
lcdcmd(64); //for degrees
lcddata(lat[i+3]);
lcddata(lat[i+4]);
lcddata(lat[i+5]);
lcddata(lat[i+6]);
lcddata(lat[i+7]);
lcddata(lat[i+8]);
lcddata(lat[i+9]);
lcddata(0x27); // minute hand
lcddata(lat[i+10]);
lcddata(lat[i+11]);
delay(250);
}
void longitude()
{
int i;
for(i=0; data!=','; i++)
{
long[i]=receiveserial();
data=long[i];
}
lcdcmd(0x01); //clear LCD display
lcdcmd(0x84); //move cursor to position 6 of line 1
drawstring("Longitude:");
lcdcmd(0xC0); //beginning of second line
lcddata(long[i+1]);
lcddata(long[i+2]);
lcdcmd(64); //for degrees
lcddata(long[i+3]);
lcddata(long[i+4]);
lcddata(long[i+5]);
lcddata(long[i+6]);
lcddata(long[i+7]);
lcddata(long[i+8]);
lcddata(long[i+9]);
lcddata(0x27); // minute hand
lcddata(long[i+10]);
lcddata(long[i+11]);
delay(250);
}
void delay(unsigned int times)
{
unsigned int i;
unsigned int j;
for(i=0;i<times;i++)
for(j=0;j<1275;j++);
}
Fri Jan 12 2018, 05:31 am
I tried to compile your 8051 version in Keil 5
but failed,because there were several errors.
You need to start with simple code that at least compiles
before writing a full program.
Are you building a hardware project or simulating in Proteus ?
What compiler are you using ?
but failed,because there were several errors.
You need to start with simple code that at least compiles
before writing a full program.
Are you building a hardware project or simulating in Proteus ?
What compiler are you using ?
[ Edited Fri Jan 12 2018, 05:33 am ]
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