UART based interrupt not working

[KOH YUEN KHANG]

I'm currently interfacing pic18f4550 with a gps module(replaced by virtual terminal in proteus). But the interrupt seems not working and the data cannot be parsed. 

I'm using Mplab IDE x8.92 with xc8 compiler.

 

---

---

---

---

void main()

{

INTCON=0;

TRISB=0;

LATB=0;

TRISA=0;

LATA=0;

TRISC=0x80;

SPBRG=spbrg_value;

lcd_ini();

UART_Initilization();

INTCONbits.GIE  = 1;              

INTCONbits.PEIE = 1;  

 

while(1)

{

while(finish!=1);

i=0;

lcdcmd(0x80);

while(i<12)

{

lcddata(lati_data); 

i++;

}

 

i=0;

lcdcmd(0xC0);

while(i<12)

{

lcddata(longi_data); 

i++;

}

 

for(i=0;i<=100;i++)

{

__delay_ms(10);

}

 

lcdcmd(0x01);

finish=0;

}

}

 

---

---

---

---

void interrupt ISR()

{

 

if(PIR1bits.RCIF && PIE1bits.RCIE)

{

PIR1bits.RCIF = 0;

 

        if(RCSTAbits.OERR)       

        {               

            RCSTAbits.CREN=0; 

            RCSTAbits.CREN=1;    

        }

 

      if(finish ==0)

{

data=rx_data(); 

if(data=='$')

{

data=rx_data();

if(data=='G')

{

data=rx_data();

if(data=='P');

{

data=rx_data();

if(data=='G');

{

data=rx_data();

if(data=='G')

{

data=rx_data();

if(data=='A')

{

data=rx_data();

if(data==',')

{

data=rx_data();

 

while(data!=',')

{

data=rx_data();

}

 

for(i=0;data!='N';i++)

{

data=rx_data();

lati_data=data; 

}

}

 

data=rx_data();

if(data==',')

{

for(i=0;data!='W';i++)

{

data=rx_data();

longi_data=data; 

}

}

}

}

}

}

}

}

      }

finish=1;

}

}

---

---

---

---

Please help!

[Author]

Posts