<mcu 초보자를 위한 MCB BASIC >  <최고의 카페 전자공작>
 
0          1 2         3 4          5 6     7      8      9 10 11   12<-Dcut[]
$GPRMC,004343.000,A,3657.4760,N,12806.0945,E,34.36,344.26,110114,0,0,A*58
$GPRMC,004344.000,A,3657.4675,N,12806.1714,E,34.43,343.61,110114,0,0,A*57
$GPRMC,004345.000,V,3657.4766,N,12806.1681,E,34.43,343.61,110114,0,0,E*4B
$GPRMC,004346.000,V,3657.4858,N,12806.1647,E,34.43,343.61,110114,0,0,E*40
$GPRMC,004347.000,V,3657.4950,N,12806.1613,E,34.43,343.61,110114,0,0,E*49
$GPRMC,004348.000,V,3657.5042,N,12806.1580,E,34.43,343.61,110114,0,0,E*44
$GPRMC,004349.000,V,3657.5134,N,12806.1546,E,34.43,343.61,110114,0,0,E*4F
$GPRMC,004350.000,V,3657.5226,N,12806.1512,E,34.43,343.61,110114,0,0,E*46
$GPRMC,004351.000,V,3657.5318,N,12806.1479,E,34.43,343.61,110114,0,0,E*47
$GPRMC,004352.000,V,3657.5409,N,12806.1445,E,34.43,343.61,110114,0,0,E*4C
$GPRMC,004353.000,V,3657.5501,N,12806.1411,E,34.43,343.61,110114,0,0,E*45
//
//[lcd][AVR PortC]
//RS(pin4)-----bit 0
//RD(pin 5)-----bit 1
//EN(pin 6)-----bit 2
//사용안함         bit 3
//[lcd][AVR PortA]
//DB4(pin 11)---bit 4
//DB5(pin 12)---bit 5
//DB6(pin 13)---bit 6
//DB7(pin 14)---bit 7
//
#include <mega128.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <delay.h>
//
char rx_buf[100];
//
char rx_cnt=0;
//
char*GPS_cut=0;
char*GPS_Dcut[16]={0};
//
char DO,BOON,CHO,HH,MM,SS,y,m,d;
long Zulu_time;
float speed,Knots;
float Latitude,Longitude;
//
char str[30];
//
#define lcd_RS  PORTC.0
#define lcd_E   PORTC.2
#define lcd_Out PORTA // PORTA.4~7 4bits
//
void lcdData(char d){
  lcd_RS=1;
  lcd_Out=(d&0xF0)|1; lcd_E=1; delay_us(1); lcd_E=0; delay_us(1);
  lcd_Out=(d<<4)|1; lcd_E=1; delay_us(1); lcd_E=0; delay_us(40);
}
//
void lcdCmd(char c){
  lcd_RS=0;
  lcd_Out=c&0xF0; lcd_E=1; delay_us(1); lcd_E=0; delay_us(1);
  lcd_Out=c<<4; lcd_E=1; delay_us(1); lcd_E=0; delay_us(40);
}
//
void lcd_init(void){
  delay_ms(50);
  lcdCmd(0x28); lcdCmd(0x28); lcdCmd(0x28);
  lcdCmd(0x0C); lcdCmd(0x06); lcdCmd(0x01); delay_ms(2);
}
//
void lcd_gotoxy(char x,char y){
  if(y==0)lcdCmd(0x80+x);
  else if(y==1)lcdCmd(0xC0+x);
  else if(y==2)lcdCmd(0x94+x);
  else if(y==3)lcdCmd(0xD4+x);
}
//
void lcd_puts(char*str){ while(*str)lcdData(*str++); }
void lcd_putsf(char flash*str){ while(*str)lcdData(*str++); }
//
interrupt[USART0_RXC]void usart0_rx_isr(void){
  unsigned char RX;
  int i;
  RX=UDR0;
//
  if(RX=='$'){ rx_buf[0]='$'; rx_cnt=1; }
  else if(RX==0x0A){
    rx_buf[rx_cnt++]=0; //null
    if(strncmp("$GPRMC",rx_buf,6)==0){
      GPS_cut=strtok(rx_buf,",");
      for(i=0; GPS_cut; i++){ GPS_Dcut[i]=GPS_cut; GPS_cut=strtok(0,","); }
//day
      d=(GPS_Dcut[9][0]&0x0F)*10+(GPS_Dcut[9][1]&0x0F);
      m=(GPS_Dcut[9][2]&0x0F)*10+(GPS_Dcut[9][3]&0x0F);
      y=(GPS_Dcut[9][4]&0x0F)*10+(GPS_Dcut[9][5]&0x0F);
//time
      Zulu_time=atol(GPS_Dcut[1]);
      HH=(char)(Zulu_time/10000+9)%24;
      MM=(char)((Zulu_time%10000)/100);
      SS=(char)(Zulu_time%100);
      sprintf(str,"20%02d/%02d/%02d%02d:%02d:%02d",y,m,d,HH,MM,SS); lcd_gotoxy(0,0); lcd_puts(str);
//speed
      Knots=atof(GPS_Dcut[7]);
      speed=Knots*1.8;
      sprintf(str,"SPEED:%6.2f Km/h    ",speed);; lcd_gotoxy(0,1); lcd_puts(str);
//Latitude 위 도
      Latitude=atof(GPS_Dcut[3]);
      DO=(char)(Latitude/100.0);
      BOON=(int)Latitude%100;
      CHO=(char)((Latitude-(int)Latitude)*60.0);
      sprintf(str,"LATIT:%c%3d\xdf%02d'%02d\x22",GPS_Dcut[4][0],DO,BOON,CHO); lcd_gotoxy(0,2); lcd_puts(str);
//Longitude 경도
      Longitude=atof(GPS_Dcut[5]);
      DO=(char)(Longitude/100.0);
      BOON=((int)Longitude%100);
      CHO=(char)((Longitude-(int)Longitude)*60.0);
      sprintf(str,"LONGI:%c%3d\xdf%02d'%02d\x22",GPS_Dcut[6][0],DO,BOON,CHO); lcd_gotoxy(0,3); lcd_puts(str);
    }
    rx_cnt=0;
  }
  else if(RX==0x0D){
    rx_buf[rx_cnt++]=0; //null
  }
  else if(RX==','){
    if(rx_buf[rx_cnt-1]==',')rx_buf[rx_cnt++]='0'; // 연속된 ','인경우 '0'을 추가함
    rx_buf[rx_cnt++]=RX;
  }
  else{
    if(rx_cnt<95)rx_buf[rx_cnt++]=RX;
  }
}
//
void main(void){
  DDRA=0xF0; DDRC=0x47; //Lcd PORT
  PORTC.6=1; //lcd back light on,K128LCD 사용자만
  DDRE.3=1;
//
  UCSR0B=0x98; UBRR0L=103;
  lcd_init();
  SREG=0x80;
  delay_ms(1000);
  while(1){ };
}
//
GPS 신호가 약해서
스피드 및 경도 위도 데이터가 오락가락 합니다.
다른데로 데이터를 보내야 하는 경우라면
0          1 2         3 4          5 6     7      8      9 10 11   12<-Dcut[]
$GPRMC,004343.000,A,3657.4760,N,12806.0945,E,34.36,344.26,110114,0,0,A*58
$GPRMC,004344.000,A,3657.4675,N,12806.1714,E,34.43,343.61,110114,0,0,A*57
$GPRMC,004345.000,V,3657.4766,N,12806.1681,E,34.43,343.61,110114,0,0,E*4B
$GPRMC,004346.000,V,3657.4858,N,12806.1647,E,34.43,343.61,110114,0,0,E*40
Dcut[2][0]이 A일 때에 보내면 됩니다.
신호가 약하면 A라고 해도 엉터리 데이터지만...
//