firebug-cvs

[David M. D. <do...@us...>]

Update of /cvsroot/firebug/fireboard/sensors/leadtek9546
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv7003

Added Files:
	gsaparse.c 
Log Message:
nmea parsing code written in c added to enable testing 
of functionality when the c code implemented in nesc.

--- NEW FILE: gsaparse.c ---


#include <stdio.h>
#include <stdlib.h>
#include <memory.h>

#include "nmea_parse.h"
#include "leadtek_9546.h"




GSA_Data *
nmea_gsa_new(void) {

  GSA_Data * gsa_data;
  gsa_data = (GSA_Data*)malloc(sizeof(GSA_Data));
  memset(gsa_data,0x0,sizeof(GSA_Data));

  return gsa_data;
}


void
nmea_gsa_delete(GSA_Data * gsa_data) {

  memset((void*)gsa_data,0xdd,sizeof(GSA_Data));
  free(gsa_data);
}

 
void
nmea_gsa_print(const GSA_Data * gsa_data) {

  int i;

  printf("Mode1: %c\n",gsa_data->mode1);
  printf("Mode2: %d\n",gsa_data->mode2);

  for (i=0; i<12; i++) {
     printf("Sat %d: %d\n",i,gsa_data->sat_used[i]);
  }
  
  printf("PDOP: %f\n",gsa_data->PDOP);
  printf("HDOP: %f\n",gsa_data->HDOP);
  printf("VDOP: %f\n",gsa_data->VDOP);
}


#define extract_mode2_m(data)      (data[0] - '0')
#define find_next_field_m(foo)     while (*foo != ',')foo++;foo++
#define extract_sat_number_m(foo)  (10*(foo[0]-'0') + (foo[1]-'0'))
#define extract_DOP_m(foo)         ((foo[0]-'0') + (0.1*(foo[2]-'0')))

GSA_Data * 
nmea_gsa_parse(const char * gsa_string) {

  int i;
  GSA_Data * gsa_data = nmea_gsa_new();
  const char * p = gsa_string;

  find_next_field_m(p);
  gsa_data->mode1 = *p;

  find_next_field_m(p);
  gsa_data->mode2 = *p - '0';


  for (i=0; i<12; i++) {
     find_next_field_m(p);
     //printf("current char: %c\n",*p);
     if (*p != ',') {
        gsa_data->sat_used[i] = extract_sat_number_m(p);
     } else {
        gsa_data->sat_used[i] = 0;
     }
  }

  find_next_field_m(p);
  gsa_data->PDOP = extract_DOP_m(p);
  find_next_field_m(p);
  gsa_data->HDOP = extract_DOP_m(p);
  find_next_field_m(p);
  gsa_data->VDOP = extract_DOP_m(p);

  return gsa_data;
}