Please find the code attached. It doesn’t display any. I am using mikroPRO C. Kindly help
– regards
-samp
//
// Program to Interface GPS GTPA010 with PIC18F2550 Microcontroller
//LCD Control pins
#define rs LATB.F4
#define en LATB.F5
//LCD Data pins
#define lcdport LATB
void lcd_ini();
void dis_cmd(unsigned char);
void dis_data(unsigned char);
void lcdcmd(unsigned char);
void lcddata(unsigned char);
unsigned char rx_data();
unsigned char longi_data[12];
unsigned char lati_data[12];
unsigned char data1,value=0;
unsigned int i=0,pos;
void main()
{
TRISB=0; // Set Port B as output port
LATB=0;
TRISA=0;
LATA=0;
UART1_init(9600);
Delay_ms(100);
// RCSTA.SPEN=1; // To activate serial port (Tx and Rx pins)
// RCSTA.CREN=1; // To enable continuous reception
lcd_ini();
while(1)
{
data1=rx_data(); // Check the string ‘$GPGGA,’
if(data1==’$’)
{
data1=rx_data();
if(data1==’G’)
{
data1=rx_data();
if(data1==’P’);
{
data1=rx_data();
if(data1==’G’);
{
data1=rx_data();
if(data1==’G’)
{
data1=rx_data();
if(data1==’A’)
{
data1=rx_data();
if(data1==’,’)
{
data1=rx_data();
while(data1!=’,’)
data1=rx_data();
for(i=0;data1!=’N’;i++)
data1=rx_data();
lati_data=data1; // Store the Latitude data
}
data1=rx_data();
if(data1==’,’)
{
for(i=0;data1!=’E’;i++)
{
data1=rx_data();
longi_data=data1; // Store the Longitude data
}
}
i=0;
dis_cmd(0x80);
while(i<11)
{
dis_data(lati_data); // Print the Latitude data
i++;
}
i=0;
dis_cmd(0xC0);
while(i<12)
{
dis_data(longi_data); // Print the Longitude data
i++;
}
}
}
}
}
}
//}
}
Delay_ms(1000);
for(i=0;i<12;i++)
{
data1=0;
lati_data=0;
longi_data=0;
}
}
}
unsigned char rx_data(void)
{
while(PIR1.RCIF==0); // Wait until RCIF gets low
return RCREG; // Store data in Reception register
}
void lcd_ini()
{
dis_cmd(0x02); // To initialize LCD in 4-bit mode.
dis_cmd(0x28); // To initialize LCD in 2 lines, 5×7 dots and 4bit mode.
dis_cmd(0x0C); // 0x01 – clear screen, 0x02, return home, 0x046- increment cursor , 0x04- decrement cursor
dis_cmd(0x06); // 0x0E – Display On, Cursor ON, 0x80-force sursor to begining of 1st line
dis_cmd(0x80); //0xC0 – Force cursor to beginning of third line, 0x94 beginning of second line 0xd4, beginning of 4th line
}
void dis_cmd(unsigned char cmd_value)
{
unsigned char cmd_value1;
cmd_value1 = ((cmd_value>>4)&0x0F); // Shift 4-bit and mask
lcdcmd(cmd_value1); // Send to LCD
cmd_value1 = (cmd_value & 0x0F); // Mask lower nibble because RB4-RB7 pins are being used
lcdcmd(cmd_value1); // Send to LCD
}
void dis_data(unsigned char data_value)
{
unsigned char data_value1;
data_value1=((data_value>>4)&0x0F);
lcddata(data_value1);
data_value1=(data_value&0x0F);
lcddata(data_value1);
}
void lcdcmd(unsigned char cmdout)
{
lcdport=cmdout; //Send command to lcdport=PORTB
rs=0;
en=1;
Delay_ms(10);
en=0;
}
void lcddata(unsigned char dataout)
{
lcdport=dataout; //Send data to lcdport=PORTB
rs=1;
en=1;
Delay_ms(10);
en=0;
}