Révision 370
Ajouté par lefraisse il y a presque 4 ans
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#include <stdlib.h>
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#include <strings.h>
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#include <math.h>
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#include "trame.h"
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#include "trame.h"
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#define pi 3.141592
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//Trames de tests ? modifier si n?cessaire.
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char * trames[]= {"$GPGSV,3,2,10,15,03,077,,18,04,041,42,19,85,271,,20,08,214,*7C",
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| ... | ... | |
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"$GPGSA,A,3,,03,,22,14,,01,,18,,,,3.9,3.4,1.9*39",
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"$GPVTG,99.4,T,,M,0.4,N,0.7,K*57",
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"$GPZDA,141914.00,01,02,2006,00,00*69",
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0};
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0};
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int trame_cmp(char* trame,char* type){
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int n=1,i;
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| ... | ... | |
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return n;
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}
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float decode_latitude(char* c){
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int i=0;
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float j, res;
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while (c[i]!= '.')
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i++;
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}
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//renvoie la valeur d?cimale des n premiers caract?res de la cha?ne ch
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int decode_nombre(char * ch, int n){
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| ... | ... | |
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cpt++;
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if (trame_cmp(trame,"GPGGA"))
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printf ("> %s\n",trame);
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}
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}
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typedef struct {
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float latitude;
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float longitude;
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} Position ;
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int decode_trame (char *trame,Position *P){
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char *type="GPGGA";
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int i,j,compteur_virgule=0,compteur_element=0,valide,virgule=0;
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char memorisation_tps[11]={'0','0','0','0','0','0','0','0','0','0','\0'};
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char memorisation_latitude[10]={'0','0','0','0','0','0','0','0','0','\0'};
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char memorisation_indic_latitude[2]={'0','\0'};
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char memorisation_longitude[11]={'0','0','0','0','0','0','0','0','0','0','\0'};
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char memorisation_indic_longitude[2]={'0','\0'};
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if (trame_cmp(trame,"GPGGA")){
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valide=1;
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for (i=6;compteur_virgule<6;i++){
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if (trame[i]==','){
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compteur_element=0;
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compteur_virgule++;
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}
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else{
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switch(compteur_virgule){
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case 1: memorisation_tps[compteur_element]=trame[i];
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compteur_element++;
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break;
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case 2: if (trame[i]!='.'){
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memorisation_latitude[compteur_element]=trame[i];
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}
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compteur_element++;
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break;
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case 3: memorisation_indic_latitude[compteur_element]=trame[i];
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compteur_element++;
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break;
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case 4: if (trame[i]!='.'){
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memorisation_longitude[compteur_element]=trame[i];
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}
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compteur_element++;
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break;
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case 5: memorisation_indic_longitude[compteur_element]=trame[i];
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compteur_element++;
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default:break;
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}
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}
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}
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}
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else
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valide=0;
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//On d?code les degr?s entiers
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P->latitude=decode_nombre(memorisation_latitude,2);
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P->longitude=decode_nombre(memorisation_longitude,3);
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//On d?code les d?gr?s flottants
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for (i=2;i<9;i++){
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P->longitude+=memorisation_longitude[i+1]*1/6*pow(10,-i+2);
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P->latitude+=(memorisation_latitude[i]-'0')*1/6*pow(10,-i+2);
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}
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//On transforme les notations S/N/E/O
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if(memorisation_indic_latitude[0]=='S')
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P->latitude = -P->latitude;
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if(memorisation_indic_longitude[0]=='O')
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P->longitude = -P->longitude;
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return valide;
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}
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float calcul_distance(Position p_1,Position p_2){
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float r=6378.137;
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return 2*r*asin(sqrt(pow(sin(pi/180*(p_1.latitude-p_2.latitude)/2),2)+cos(pi/180*p_1.latitude)*cos(pi/180*p_2.latitude)*pow(sin(pi/180*(p_1.longitude-p_2.longitude)/2),2)));
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}
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//Ajouter vos tests unitaires dans cette fonction.
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void tests_unitaires(void){
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if (5!=5){
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Formats disponibles : Unified diff
Mise en place de la fonction decode_trame et calcul_distance