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/* |
This program (files gps.c and gps.h) is free software; you can redistribute it and/or modify |
it under the terms of the GNU General Public License as published by the Free Software Foundation; |
either version 3 of the License, or (at your option) any later version. |
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
GNU General Public License for more details. You should have received a copy of the GNU General Public License |
along with this program. If not, see <http://www.gnu.org/licenses/>. |
|
Please note: All the other files for the project "Mikrokopter" by H.Buss are under the license (license_buss.txt) published by www.mikrokopter.de |
*/ |
/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
Peter Muehlenbrock |
Auswertung der Daten vom GPS im ublox Format |
Regelung fuer GPS noch nicht implementiert |
Stand 16.9.2007 |
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
*/ |
#include "main.h" |
//#include "gps.h" |
|
// Defines fuer ublox Messageformat um Auswertung zu steuern |
#define UBLOX_IDLE 0 |
#define UBLOX_SYNC1 1 |
#define UBLOX_SYNC2 2 |
#define UBLOX_CLASS 3 |
#define UBLOX_ID 4 |
#define UBLOX_LEN1 5 |
#define UBLOX_LEN2 6 |
#define UBLOX_CKA 7 |
#define UBLOX_CKB 8 |
#define UBLOX_PAYLOAD 9 |
|
// ublox Protokoll Identifier |
#define UBLOX_NAV_POSUTM 0x08 |
#define UBLOX_NAV_STATUS 0x03 |
#define UBLOX_NAV_VELED 0x12 |
#define UBLOX_NAV_CLASS 0x01 |
#define UBLOX_SYNCH1_CHAR 0xB5 |
#define UBLOX_SYNCH2_CHAR 0x62 |
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signed int GPS_Nick = 0; |
signed int GPS_Roll = 0; |
short int ublox_msg_state = UBLOX_IDLE; |
static uint8_t chk_a =0; //Checksum |
static uint8_t chk_b =0; |
short int gps_state; |
short int gps_updte_flag; |
signed int GPS_hdng_abs_2trgt; //Winkel zum Ziel bezogen auf Nordpol |
signed int GPS_hdng_rel_2trgt; //Winkel zum Ziel bezogen auf Nordachse des Kopters |
signed int GPS_dist_2trgt; //vorzeichenlose Distanz zum Ziel |
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static unsigned int rx_len; |
unsigned int cnt0,cnt1,cnt2; //******Provisorisch |
static unsigned int ptr_payload_data_end; |
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static uint8_t *ptr_payload_data; |
static uint8_t *ptr_pac_status; |
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short int Get_GPS_data(void); |
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NAV_POSUTM_t actual_pos; // Aktuelle Nav Daten werden hier im ublox Format abgelegt |
NAV_STATUS_t actual_status; // Aktueller Nav Status |
NAV_VELNED_t actual_speed; // Aktueller Geschwindigkeits und Richtungsdaten |
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GPS_ABS_POSITION_t gps_act_position; // Alle wichtigen Daten zusammengefasst |
GPS_ABS_POSITION_t gps_home_position; // Die Startposition, beim Kalibrieren ermittelt |
GPS_REL_POSITION_t gps_rel_act_position; // Die aktuelle relative Position bezogen auf Home Position |
GPS_REL_POSITION_t gps_rel_hold_position; // Die gespeicherte Sollposition fuer GPS_ Hold Mode |
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// Initialisierung |
void GPS_Neutral(void) |
{ |
short int n; |
ublox_msg_state = UBLOX_IDLE; |
gps_state = GPS_CRTL_IDLE; |
actual_pos.status = 0; |
actual_speed.status = 0; |
actual_status.status = 0; |
gps_home_position.status = 0; // Noch keine gueltige Home Position |
gps_act_position.status = 0; |
gps_rel_act_position.status = 0; |
GPS_Nick = 0; |
GPS_Roll = 0; |
gps_updte_flag = 0; |
} |
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// Home Position sichern falls Daten verfuegbar sind. |
void GPS_Save_Home(void) |
{ |
short int n; |
n = Get_GPS_data(); |
if (n == 0) // Gueltige und aktuelle Daten ? |
{ |
// Neue GPS Daten liegen vor |
gps_home_position.utm_east = gps_act_position.utm_east; |
gps_home_position.utm_north = gps_act_position.utm_north; |
gps_home_position.utm_alt = gps_act_position.utm_alt; |
gps_home_position.status = 1; // Home Position gueltig |
} |
} |
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// Relative Position zur Home Position bestimmen |
// Rueckgabewert 0= Daten sind aktuell und gueltig. 1= Keine Aenderung. 2= Daten ungueltig |
short int Get_Rel_Position(void) |
{ |
short int n = 0; |
n = Get_GPS_data(); |
if (n >=1) return (n); // nix zu tun, weil keine neue Daten da sind |
if (gps_home_position.status > 0) //Nur wenn Home Position vorliegt |
{ |
gps_rel_act_position.utm_east = (int) (gps_act_position.utm_east - gps_home_position.utm_east); |
gps_rel_act_position.utm_north = (int) (gps_act_position.utm_north - gps_home_position.utm_north); |
gps_rel_act_position.status = 1; // gueltige Positionsdaten |
n = 0; |
gps_updte_flag = 1; // zeigt an, dass neue Daten vorliegen. |
} |
else |
{ |
n = 2; //keine gueltigen Daten vorhanden |
gps_rel_act_position.status = 0; //keine gueltige Position weil keine home Position da ist. |
} |
return (n); |
} |
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// Daten aus aktuellen ublox Messages extrahieren |
// Rueckgabewert 0= Daten sind aktuell und gueltig. 1= Keine Aenderung. 2= Daten ungueltig |
short int Get_GPS_data(void) |
{ |
short int n = 1; |
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if (actual_pos.status == 0) return (1); //damit es schnell geht, wenn nix zu tun ist |
if ((actual_pos.status > 0) && (actual_status.status > 0) && (actual_speed.status > 0)) |
{ |
cnt1++; //**** noch Rausschmeissen |
if (((actual_status.gpsfix_type & 0x03) >=2) && ((actual_status.nav_status_flag & 0x01) >=1)) // nur wenn Daten aktuell und gueltig sind |
{ |
gps_act_position.utm_east = actual_pos.utm_east/10; |
gps_act_position.utm_north = actual_pos.utm_north/10; |
gps_act_position.utm_alt = actual_pos.utm_alt/10; |
gps_act_position.speed_gnd = actual_speed.speed_gnd/10; |
gps_act_position.speed_gnd = actual_speed.speed_gnd/10; |
gps_act_position.heading = actual_speed.heading/100000; |
gps_act_position.status = 1; |
n = 0; //Daten gueltig |
} |
else |
{ |
gps_act_position.status = 0; //Keine gueltigen Daten |
n = 2; |
} |
actual_pos.status = 0; //neue ublox Messages anfordern |
actual_status.status = 0; |
actual_speed.status = 0; |
} |
return (n); |
} |
|
|
/* |
Daten vom GPS im ublox MSG Format auswerten |
Die Routine wird bei jedem Empfang eines Zeichens vom GPS Modul durch den UART IRQ aufgerufen |
// Die UBX Messages NAV_POSUTM, NAV_STATUS und NAV_VALED muessen aktiviert sein |
*/ |
void Get_Ublox_Msg(uint8_t rx) |
{ |
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switch (ublox_msg_state) |
{ |
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case UBLOX_IDLE: // Zuerst Synchcharacters pruefen |
if ( rx == UBLOX_SYNCH1_CHAR ) ublox_msg_state = UBLOX_SYNC1; |
else ublox_msg_state = UBLOX_IDLE; |
break; |
|
case UBLOX_SYNC1: |
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if (rx == UBLOX_SYNCH2_CHAR) ublox_msg_state = UBLOX_SYNC2; |
else ublox_msg_state = UBLOX_IDLE; |
chk_a = 0,chk_b = 0; |
break; |
|
case UBLOX_SYNC2: |
if (rx == UBLOX_NAV_CLASS) ublox_msg_state = UBLOX_CLASS; |
else ublox_msg_state = UBLOX_IDLE; |
break; |
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case UBLOX_CLASS: // Nur NAV Meldungen auswerten |
switch (rx) |
{ |
case UBLOX_NAV_POSUTM: |
ptr_pac_status = &actual_pos.status; |
if (*ptr_pac_status > 0) ublox_msg_state = UBLOX_IDLE; //Abbruch weil Daten noch nicht verwendet wurden |
else |
{ |
ptr_payload_data = &actual_pos; |
ptr_payload_data_end = &actual_pos.status; |
ublox_msg_state = UBLOX_LEN1; |
} |
break; |
|
case UBLOX_NAV_STATUS: |
ptr_pac_status = &actual_status.status; |
if (*ptr_pac_status > 0) ublox_msg_state = UBLOX_IDLE; |
else |
{ |
ptr_payload_data = &actual_status; |
ptr_payload_data_end = &actual_status.status; |
ublox_msg_state = UBLOX_LEN1; |
} |
break; |
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case UBLOX_NAV_VELED: |
ptr_pac_status = &actual_speed.status; |
if (*ptr_pac_status > 0) ublox_msg_state = UBLOX_IDLE; |
else |
{ |
ptr_payload_data = &actual_speed; |
ptr_payload_data_end = &actual_speed.status; |
ublox_msg_state = UBLOX_LEN1; |
} |
break; |
|
default: |
ublox_msg_state = UBLOX_IDLE; |
break; |
} |
chk_a = UBLOX_NAV_CLASS + rx; |
chk_b = UBLOX_NAV_CLASS + chk_a; |
break; |
|
case UBLOX_LEN1: // Laenge auswerten |
rx_len = rx; |
chk_a += rx; |
chk_b += chk_a; |
ublox_msg_state = UBLOX_LEN2; |
break; |
|
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case UBLOX_LEN2: // Laenge auswerten |
rx_len = rx_len + (rx *256); // Laenge ermitteln |
chk_a += rx; |
chk_b += chk_a; |
ublox_msg_state = UBLOX_PAYLOAD; |
break; |
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case UBLOX_PAYLOAD: // jetzt Nutzdaten einlesen |
if (rx_len > 0) |
{ |
*ptr_payload_data = rx; |
chk_a += rx; |
chk_b += chk_a; |
--rx_len; |
if ((rx_len > 0) && (ptr_payload_data <= ptr_payload_data_end)) |
{ |
ptr_payload_data++; |
ublox_msg_state = UBLOX_PAYLOAD; |
} |
else ublox_msg_state = UBLOX_CKA; |
} |
else ublox_msg_state = UBLOX_IDLE; // Abbruch wegen Fehler |
break; |
|
case UBLOX_CKA: // Checksum pruefen |
if (rx == chk_a) ublox_msg_state = UBLOX_CKB; |
else ublox_msg_state = UBLOX_IDLE; // Abbruch wegen Fehler |
break; |
|
case UBLOX_CKB: // Checksum pruefen |
if (rx == chk_b) *ptr_pac_status = 1; // Paket ok |
ublox_msg_state = UBLOX_IDLE; |
break; |
|
default: |
ublox_msg_state = UBLOX_IDLE; |
break; |
} |
} |
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//Zentrale Statemachine fuer alle GPS relevanten Regelungsablauefe |
short int GPS_CRTL(short int cmd) |
{ |
static unsigned int cnt; //Zaehler fuer diverse Verzoegerungen |
|
switch (cmd) |
{ |
case GPS_CMD_REQ_HOLD: // Die Lageregelung soll aktiviert werden. |
if (gps_state != GPS_CRTL_HOLD_ACTIVE) |
{ |
cnt++; |
if (cnt > 300) // erst nach Verzoegerung |
{ |
cnt = 0; |
// aktuelle positionsdaten abespeichern |
if (gps_rel_act_position.status > 0) |
{ |
gps_rel_hold_position.utm_east = gps_rel_act_position.utm_east; |
gps_rel_hold_position.utm_north = gps_rel_act_position.utm_north; |
gps_rel_hold_position.status = 1; // gueltige Positionsdaten |
gps_state = GPS_CRTL_HOLD_ACTIVE; |
return (GPS_STST_OK); |
} |
else |
{ |
gps_rel_hold_position.status = 0; //Keine Daten verfuegbar |
gps_state = GPS_CRTL_IDLE; |
return(GPS_STST_ERR); // Keine Daten da |
} |
} |
else return(GPS_STST_PEND); // noch warten |
} |
break; |
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case GPS_CMD_STOP_HOLD: // Lageregelung beenden |
cnt = 0; |
GPS_Nick = 0; |
GPS_Roll = 0; |
gps_state = GPS_CRTL_IDLE; |
return (GPS_STST_OK); |
break; |
|
default: |
return (GPS_STST_ERR); |
break; |
} |
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switch (gps_state) |
{ |
case GPS_CRTL_IDLE: |
cnt = 0; |
return (GPS_STST_OK); |
break; |
|
case GPS_CRTL_HOLD_ACTIVE: // Hier werden die Daten fuer Nick und Roll errechnet |
if (gps_updte_flag = 1) //nur wenn neue GPS Daten vorliegen |
{ |
gps_updte_flag = 0; |
// ab hier wird geregelt |
// Richtung zum Ziel ermitteln |
signed int dist_north,dist_east; |
dist_east = gps_rel_hold_position.utm_east - gps_rel_act_position.utm_east; |
dist_north = gps_rel_hold_position.utm_north - gps_rel_act_position.utm_north; |
GPS_hdng_abs_2trgt = arctan_i((long)dist_east,(long)dist_north); |
//in Winkel 0..360 grad umrechnen |
if ((dist_east >= 0) && (dist_north < 0)) GPS_hdng_abs_2trgt = ( 90-GPS_hdng_abs_2trgt); |
else if ((dist_east < 0) ) GPS_hdng_abs_2trgt = (270 - GPS_hdng_abs_2trgt); |
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// Distanz zum Ziel ermitteln |
GPS_dist_2trgt = abs(dist_north) + abs(dist_east);//ACHTUNG: Noch Nicht korrekt |
return (GPS_STST_OK); |
} |
else return (GPS_STST_OK); |
break; |
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default: |
gps_state = GPS_CRTL_IDLE; |
return (GPS_STST_ERR); |
break; |
} |
return (GPS_STST_ERR); |
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} |
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