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#include <pic.h>
#include <htc.h>
#include "lcd.h"
#include "delay.h"


__CONFIG(INTIO & WDTDIS & PWRTDIS & MCLRDIS & UNPROTECT & BORDIS & IESODIS & FCMDIS);
unsigned int BUFFMAX = 80;
unsigned char gps_string[80];	//Databuffer
//char gps_string2[] = "$GPRMC,224204.000,A,5535.3985,N,01300.8159,E,6.83,258.07,040810,,*0F";

int head = 0; 


void usart(void){
	TRISB = 0XFF;
	#asm
	bcf _TRISB,7	//RB7 USART-output 	
	#endasm
	TRISC = 0X00;	//Just for debug
	PORTC = 0;		//-||-
	ANSELH = 0x00; 	//All pins digital
	SPBRG = 51;		//4800 bps
	BRGH = 1;
	TXEN = 1; 		//Allows sending
	SYNC = 0; 		//The SYNC bit should be cleared to select asynchronous operation.
	SPEN = 1; 		//SPEN bit is used to enable the entire serial port
	CREN = 0;
	CREN = 1; 		//Allows receiving
	GIE = 1;  		//*Interrupts
	PEIE = 1;
	TXIE = 0; 		//Disable transmit interrupt
	RCIE = 1; 		//Enable receive interrupt

}

void putch(unsigned char c){ 
	
	while(!TXIF) 	//Set when TXREG is empty
	continue; 		//Continue looping while TXREG is not available
	TXREG = c; 		//Put character to be sent onto TXREG 

}


enum {START_WAIT, RECEIVING, MSG_RECEIVED} state = START_WAIT;  
void interrupt pic_isr(void) {  
    unsigned char c;
	if((RCIE)&&(RCIF)){                                  // If this interrupt was generated by a receive character  
		c = RCREG;
	 	switch(state){
						
			case START_WAIT:
				if(c == '$'){
					head = 0;
					state = RECEIVING;
				}
				break;
			case RECEIVING:
					
					if(c == '*'){
						state = MSG_RECEIVED;
					}
					else{
						gps_string[head] = c;
						if(++head>=BUFFMAX){
							state = START_WAIT;
						}					
					}
					break;	
		}
	}
   	if(OERR){           // If we missed a character (Overrun Error) 
    	CREN = 0;          // Reset the error bit  
		CREN = 1;
	}
} 

void main(void){
	usart();									//Initialize USART
	while(1){								
		if(state == MSG_RECEIVED){
				for(int i = 0; i <= head; i++){
					putch(gps_string[i]);
				}	
			state = START_WAIT;		
		}
	}
}

Kod: Markera allt

void putch(unsigned char c)
  {
  while(!TXIF)    //Set when TXREG is empty
  continue; // <-- Vad fan är detta?
  TXREG = c;       //Put character to be sent onto TXREG
  }

Kod: Markera allt

void putch(unsigned char c)
  {
  while(!TXIF);    //Set when TXREG is empty
  TXREG = c;       //Put character to be sent onto TXREG
  }

Kod: Markera allt

unsigned int BUFFMAX = 80;
unsigned char gps_string[80];   //Databuffer

Kod: Markera allt

#define BUFFMAX 80
unsigned char gps_string[BUFFMAX];   //Databuffer

Kod: Markera allt

...
               else{
                  gps_string[head] = c;
                  if(++head >= sizeof(gps_string)){
                     state = START_WAIT;
                  }