c program for gps based warning system when crossing boundaries

[chalani]

 

#include <htc.h>

#define RX_PIN TRISC7
#define TX_PIN TRISC6
#define _XTAL_FREQ 4000000


__CONFIG(1,XT & WDTDIS & LVPDIS);

/****** serial comms using USART to comm port ***************/

void serial_setup()
{
SYNC=0; //Asynchronous mode
BRGH=1; //High Speed
SPBRG=25; //9600 bps
SPEN=1; //Enable serial port
CREN=1; //Enable reception
SREN=0; //No effect
TXIE=0; //Desable interrupts
RCIE=0; //disable rx interrupts
TX9=0; //8-bit transmission
RX9=0; //8-bit reception
TXEN=1; // Enable transmission
}

void putch(unsigned char byte) 
{
/* output one byte */
while(!TXIF) /* set when register is empty */
continue;
TXREG = byte;
}

unsigned char getch() {
/* retrieve one byte */
while(!RCIF) /* set when register is not empty */
continue;
return RCREG;
}



unsigned char getch();
unsigned char longi_data[12];
unsigned char lati_data[12];
unsigned char data,value=0;
unsigned int i=0,pos;

float latitude;

void main(void){
RX_PIN = 1;
TX_PIN = 0;
unsigned char input1;
unsigned char input2;
unsigned char input3;
serial_setup();
INTCON=0; // purpose of disabling the interrupts.




while(1){

{
data=getch(); // Check the string ‘$GPGGA,’
if(data==’$’)
{
data=getch();
if(data==’G’)
{
data=getch();
if(data==’P’);
{
data=getch();
if(data==’G’);
{
data=getch();;
if(data==’G’)
{
data=getch();
if(data==’A’)
{
data=getch();
if(data==’,’)
{
data=getch();
while(data!=’,’)

data=getch();

for(i=0;data!=’N’;i++)
{ data=getch();
lati_data=data; // Store the Latitude data

putch(data);
}
} data=getch();
if(data==’,’)
{
for(i=0;data!=’E’;i++)
{
data=getch();

longi_data=data; // Store the Longitude data
putch(data);
}
}




i=0;

while(i<11)
{
PORTB=lati_data; // Print the Latitude data

i++;
}

i=0;

while(i<12)
{
PORTD=longi_data; // Print the Longitude data


i++;
}





}









}
}
}
}
}
}

__delay_ms(10);
for(i=0;i<12;i++)
{
data=0;
lati_data=0;
longi_data=0;
}
}


}

 

 

 

 

 

am doing my final project on gps based warning system for fishermen, and i want to receive gps data into my controller and exctract only the longitudanal and latitudanal data, and then i have to compare it with my previously stored boundaries and make nececsary outputs by comaparing, In my program i could exctract only the longitudanal and latitudanal data , and stored them as character strings. This worked fine and i checked using pic simulator i gave the sentence $GPGGA,100156.000,2650.9416,N,07547.8441,E,1,08,1. 0,442.8,M,-42.5,M,,0000*71 to the hardware UART simulation interface and it correctly worked.I am using MPLAB IDE V8.83 and now i want to convert this character string in to numerics in order to compare with my boundaries. i hv no idea how to do this and compare with boundaries.. It would be grateful if u can help me on this or give any support 

Thank you

 

[AJISH ALFRED]

Hi Chalani,

So you need to convert the string to intger value, right?

Here is a simple code for string to intger conversion. Please refer it, and apply in your code.

I’m not sure the atoi() will work on your compiler.

 

#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
int main() {
  int i;
  i = atoi("100");                  // HERE IS THE CONVERSION
  printf("The integer value is: %d", i);
  getch();
  return 0;
}

 

Try and update the result

[chalani]

hi ajish,

 

thnak you so much, for your kind consideration on my problem. yes its work fine on my compiler..

thnk you again

 

regards 

chalani

 

 

 

[AJISH ALFRED]

 

You are welcome. If you face any further issues regarding your project, just update here.

All the best

[Author]

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