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1612 | dongfang | 1 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 | // + Copyright (c) 04.2007 Holger Buss |
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3 | // + Nur für den privaten Gebrauch |
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4 | // + www.MikroKopter.com |
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5 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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6 | // + Es gilt für das gesamte Projekt (Hardware, Software, Binärfiles, Sourcecode und Dokumentation), |
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7 | // + dass eine Nutzung (auch auszugsweise) nur für den privaten (nicht-kommerziellen) Gebrauch zulässig ist. |
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8 | // + Sollten direkte oder indirekte kommerzielle Absichten verfolgt werden, ist mit uns (info@mikrokopter.de) Kontakt |
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9 | // + bzgl. der Nutzungsbedingungen aufzunehmen. |
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10 | // + Eine kommerzielle Nutzung ist z.B.Verkauf von MikroKoptern, Bestückung und Verkauf von Platinen oder Bausätzen, |
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11 | // + Verkauf von Luftbildaufnahmen, usw. |
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12 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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13 | // + Werden Teile des Quellcodes (mit oder ohne Modifikation) weiterverwendet oder veröffentlicht, |
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14 | // + unterliegen sie auch diesen Nutzungsbedingungen und diese Nutzungsbedingungen incl. Copyright müssen dann beiliegen |
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15 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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16 | // + Sollte die Software (auch auszugesweise) oder sonstige Informationen des MikroKopter-Projekts |
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17 | // + auf anderen Webseiten oder sonstigen Medien veröffentlicht werden, muss unsere Webseite "http://www.mikrokopter.de" |
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18 | // + eindeutig als Ursprung verlinkt werden |
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19 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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20 | // + Keine Gewähr auf Fehlerfreiheit, Vollständigkeit oder Funktion |
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21 | // + Benutzung auf eigene Gefahr |
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22 | // + Wir übernehmen keinerlei Haftung für direkte oder indirekte Personen- oder Sachschäden |
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23 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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24 | // + Die Portierung der Software (oder Teile davon) auf andere Systeme (ausser der Hardware von www.mikrokopter.de) ist nur |
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25 | // + mit unserer Zustimmung zulässig |
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26 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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27 | // + Die Funktion printf_P() unterliegt ihrer eigenen Lizenz und ist hiervon nicht betroffen |
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28 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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29 | // + Redistributions of source code (with or without modifications) must retain the above copyright notice, |
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30 | // + this list of conditions and the following disclaimer. |
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31 | // + * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived |
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32 | // + from this software without specific prior written permission. |
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33 | // + * The use of this project (hardware, software, binary files, sources and documentation) is only permittet |
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34 | // + for non-commercial use (directly or indirectly) |
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35 | // + Commercial use (for excample: selling of MikroKopters, selling of PCBs, assembly, ...) is only permitted |
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36 | // + with our written permission |
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37 | // + * If sources or documentations are redistributet on other webpages, out webpage (http://www.MikroKopter.de) must be |
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38 | // + clearly linked as origin |
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39 | // + * porting to systems other than hardware from www.mikrokopter.de is not allowed |
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40 | // + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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41 | // + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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42 | // + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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43 | // + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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44 | // + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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45 | // + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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46 | // + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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47 | // + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN// + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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48 | // + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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49 | // + POSSIBILITY OF SUCH DAMAGE. |
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50 | // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
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51 | #include <inttypes.h> |
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52 | #include <stdlib.h> |
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1775 | - | 53 | //#include "mymath.h" |
1612 | dongfang | 54 | #include "timer0.h" |
55 | #include "uart0.h" |
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56 | #include "rc.h" |
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57 | #include "eeprom.h" |
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58 | |||
1805 | - | 59 | typedef enum { |
60 | GPS_FLIGHT_MODE_UNDEF, |
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61 | GPS_FLIGHT_MODE_FREE, |
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62 | GPS_FLIGHT_MODE_AID, |
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63 | GPS_FLIGHT_MODE_HOME, |
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64 | } FlightMode_t; |
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1612 | dongfang | 65 | |
66 | #define GPS_POSINTEGRAL_LIMIT 32000 |
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67 | #define GPS_STICK_LIMIT 45 // limit of gps stick control to avoid critical flight attitudes |
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68 | #define GPS_P_LIMIT 25 |
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69 | |||
1805 | - | 70 | typedef struct { |
71 | int32_t Longitude; |
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72 | int32_t Latitude; |
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73 | int32_t Altitude; |
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74 | Status_t Status; |
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1612 | dongfang | 75 | } GPS_Pos_t; |
76 | |||
77 | // GPS coordinates for hold position |
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1805 | - | 78 | GPS_Pos_t HoldPosition = { 0, 0, 0, INVALID }; |
1612 | dongfang | 79 | // GPS coordinates for home position |
1805 | - | 80 | GPS_Pos_t HomePosition = { 0, 0, 0, INVALID }; |
1612 | dongfang | 81 | // the current flight mode |
82 | FlightMode_t FlightMode = GPS_FLIGHT_MODE_UNDEF; |
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83 | |||
84 | // --------------------------------------------------------------------------------- |
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1775 | - | 85 | void GPS_UpdateParameter(void) { |
1805 | - | 86 | static FlightMode_t FlightModeOld = GPS_FLIGHT_MODE_UNDEF; |
1612 | dongfang | 87 | |
1805 | - | 88 | if ((RC_Quality < 100) || (MKFlags & MKFLAG_EMERGENCY_LANDING)) { |
89 | FlightMode = GPS_FLIGHT_MODE_FREE; |
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90 | } else { |
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91 | if (dynamicParams.NaviGpsModeControl < 50) |
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92 | FlightMode = GPS_FLIGHT_MODE_AID; |
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93 | else if (dynamicParams.NaviGpsModeControl < 180) |
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94 | FlightMode = GPS_FLIGHT_MODE_FREE; |
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95 | else |
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96 | FlightMode = GPS_FLIGHT_MODE_HOME; |
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97 | } |
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98 | |||
99 | if (FlightMode != FlightModeOld) { |
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100 | BeepTime = 100; |
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101 | } |
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102 | FlightModeOld = FlightMode; |
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1612 | dongfang | 103 | } |
104 | |||
105 | // --------------------------------------------------------------------------------- |
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106 | // This function defines a good GPS signal condition |
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1775 | - | 107 | uint8_t GPS_IsSignalOK(void) { |
1805 | - | 108 | static uint8_t GPSFix = 0; |
109 | if ((GPSInfo.status != INVALID) && (GPSInfo.satfix == SATFIX_3D) |
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110 | && (GPSInfo.flags & FLAG_GPSFIXOK) && ((GPSInfo.satnum |
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111 | >= staticParams.NaviGpsMinSat) || GPSFix)) { |
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112 | GPSFix = 1; |
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113 | return 1; |
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114 | } else |
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115 | return (0); |
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1775 | - | 116 | } |
1612 | dongfang | 117 | |
118 | // --------------------------------------------------------------------------------- |
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119 | // rescale xy-vector length to limit |
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1775 | - | 120 | uint8_t GPS_LimitXY(int32_t *x, int32_t *y, int32_t limit) { |
1805 | - | 121 | uint8_t retval = 0; |
122 | int32_t len; |
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123 | len = (int32_t) c_sqrt(*x * *x + *y * *y); |
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124 | if (len > limit) { |
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125 | // normalize control vector components to the limit |
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126 | *x = (*x * limit) / len; |
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127 | *y = (*y * limit) / len; |
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128 | retval = 1; |
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129 | } |
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130 | return (retval); |
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1612 | dongfang | 131 | } |
132 | |||
133 | // checks nick and roll sticks for manual control |
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1775 | - | 134 | uint8_t GPS_IsManualControlled(void) { |
1805 | - | 135 | if ((abs(PPM_in[staticParams.ChannelAssignment[CH_NICK]]) |
136 | < staticParams.NaviStickThreshold) |
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137 | && (abs(PPM_in[staticParams.ChannelAssignment[CH_ROLL]]) |
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138 | < staticParams.NaviStickThreshold)) |
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139 | return 0; |
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140 | else |
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141 | return 1; |
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1612 | dongfang | 142 | } |
143 | |||
144 | // set given position to current gps position |
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1775 | - | 145 | uint8_t GPS_SetCurrPosition(GPS_Pos_t * pGPSPos) { |
1805 | - | 146 | uint8_t retval = 0; |
147 | if (pGPSPos == NULL) |
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148 | return (retval); // bad pointer |
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1612 | dongfang | 149 | |
1805 | - | 150 | if (GPS_IsSignalOK()) { // is GPS signal condition is fine |
151 | pGPSPos->Longitude = GPSInfo.longitude; |
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152 | pGPSPos->Latitude = GPSInfo.latitude; |
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153 | pGPSPos->Altitude = GPSInfo.altitude; |
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154 | pGPSPos->Status = NEWDATA; |
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155 | retval = 1; |
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156 | } else { // bad GPS signal condition |
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157 | pGPSPos->Status = INVALID; |
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158 | retval = 0; |
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159 | } |
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160 | return (retval); |
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1612 | dongfang | 161 | } |
162 | |||
163 | // clear position |
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1775 | - | 164 | uint8_t GPS_ClearPosition(GPS_Pos_t * pGPSPos) { |
1805 | - | 165 | uint8_t retval = 0; |
166 | if (pGPSPos == NULL) |
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167 | return retval; // bad pointer |
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168 | else { |
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169 | pGPSPos->Longitude = 0; |
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170 | pGPSPos->Latitude = 0; |
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171 | pGPSPos->Altitude = 0; |
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172 | pGPSPos->Status = INVALID; |
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173 | retval = 1; |
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174 | } |
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175 | return (retval); |
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1612 | dongfang | 176 | } |
177 | |||
178 | // disable GPS control sticks |
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1775 | - | 179 | void GPS_Neutral(void) { |
1805 | - | 180 | GPSStickNick = 0; |
181 | GPSStickRoll = 0; |
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1612 | dongfang | 182 | } |
183 | |||
184 | // calculates the GPS control stick values from the deviation to target position |
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185 | // if the pointer to the target positin is NULL or is the target position invalid |
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186 | // then the P part of the controller is deactivated. |
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1775 | - | 187 | void GPS_PIDController(GPS_Pos_t *pTargetPos) { |
1805 | - | 188 | static int32_t PID_Nick, PID_Roll; |
189 | int32_t coscompass, sincompass; |
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190 | int32_t GPSPosDev_North, GPSPosDev_East; // Position deviation in cm |
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191 | int32_t P_North = 0, D_North = 0, P_East = 0, D_East = 0, I_North = 0, |
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192 | I_East = 0; |
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193 | int32_t PID_North = 0, PID_East = 0; |
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194 | static int32_t cos_target_latitude = 1; |
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195 | static int32_t GPSPosDevIntegral_North = 0, GPSPosDevIntegral_East = 0; |
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196 | static GPS_Pos_t *pLastTargetPos = 0; |
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1612 | dongfang | 197 | |
1805 | - | 198 | // if GPS data and Compass are ok |
199 | if (GPS_IsSignalOK() && (CompassHeading >= 0)) { |
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200 | if (pTargetPos != NULL) // if there is a target position |
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201 | { |
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202 | if (pTargetPos->Status != INVALID) // and the position data are valid |
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203 | { |
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204 | // if the target data are updated or the target pointer has changed |
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1821 | - | 205 | if ((pTargetPos->Status != PROCESSED) || (pTargetPos != pLastTargetPos)) { |
1805 | - | 206 | // reset error integral |
207 | GPSPosDevIntegral_North = 0; |
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208 | GPSPosDevIntegral_East = 0; |
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209 | // recalculate latitude projection |
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210 | cos_target_latitude = (int32_t) c_cos_8192( |
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211 | (int16_t) (pTargetPos->Latitude / 10000000L)); |
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212 | // remember last target pointer |
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213 | pLastTargetPos = pTargetPos; |
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214 | // mark data as processed |
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215 | pTargetPos->Status = PROCESSED; |
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216 | } |
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217 | // calculate position deviation from latitude and longitude differences |
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218 | GPSPosDev_North = (GPSInfo.latitude - pTargetPos->Latitude); // to calculate real cm we would need *111/100 additionally |
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219 | GPSPosDev_East = (GPSInfo.longitude - pTargetPos->Longitude); // to calculate real cm we would need *111/100 additionally |
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220 | // calculate latitude projection |
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221 | GPSPosDev_East *= cos_target_latitude; |
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222 | GPSPosDev_East /= 8192; |
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223 | } else {// no valid target position available |
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224 | // reset error |
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225 | GPSPosDev_North = 0; |
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226 | GPSPosDev_East = 0; |
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227 | // reset error integral |
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228 | GPSPosDevIntegral_North = 0; |
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229 | GPSPosDevIntegral_East = 0; |
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230 | } |
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231 | } else { // no target position available |
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232 | // reset error |
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233 | GPSPosDev_North = 0; |
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234 | GPSPosDev_East = 0; |
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235 | // reset error integral |
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236 | GPSPosDevIntegral_North = 0; |
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237 | GPSPosDevIntegral_East = 0; |
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238 | } |
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239 | |||
240 | //Calculate PID-components of the controller |
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241 | |||
242 | // D-Part |
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243 | D_North = ((int32_t) dynamicParams.NaviGpsD * GPSInfo.velnorth) / 512; |
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244 | D_East = ((int32_t) dynamicParams.NaviGpsD * GPSInfo.veleast) / 512; |
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245 | |||
246 | // P-Part |
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247 | P_North = ((int32_t) dynamicParams.NaviGpsP * GPSPosDev_North) / 2048; |
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248 | P_East = ((int32_t) dynamicParams.NaviGpsP * GPSPosDev_East) / 2048; |
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249 | |||
250 | // I-Part |
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251 | I_North = ((int32_t) dynamicParams.NaviGpsI * GPSPosDevIntegral_North) |
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252 | / 8192; |
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1821 | - | 253 | I_East = ((int32_t) dynamicParams.NaviGpsI * GPSPosDevIntegral_East) / 8192; |
1805 | - | 254 | |
255 | // combine P & I |
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256 | PID_North = P_North + I_North; |
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257 | PID_East = P_East + I_East; |
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258 | if (!GPS_LimitXY(&PID_North, &PID_East, GPS_P_LIMIT)) { |
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259 | GPSPosDevIntegral_North += GPSPosDev_North / 16; |
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260 | GPSPosDevIntegral_East += GPSPosDev_East / 16; |
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261 | GPS_LimitXY(&GPSPosDevIntegral_North, &GPSPosDevIntegral_East, |
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262 | GPS_POSINTEGRAL_LIMIT); |
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263 | } |
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264 | |||
265 | // combine PI- and D-Part |
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266 | PID_North += D_North; |
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267 | PID_East += D_East; |
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268 | |||
269 | // scale combination with gain. |
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270 | PID_North = (PID_North * (int32_t) dynamicParams.NaviGpsGain) / 100; |
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271 | PID_East = (PID_East * (int32_t) dynamicParams.NaviGpsGain) / 100; |
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272 | |||
273 | // GPS to nick and roll settings |
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274 | // A positive nick angle moves head downwards (flying forward). |
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275 | // A positive roll angle tilts left side downwards (flying left). |
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276 | // If compass heading is 0 the head of the copter is in north direction. |
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277 | // A positive nick angle will fly to north and a positive roll angle will fly to west. |
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278 | // In case of a positive north deviation/velocity the |
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279 | // copter should fly to south (negative nick). |
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280 | // In case of a positive east position deviation and a positive east velocity the |
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281 | // copter should fly to west (positive roll). |
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282 | // The influence of the GPSStickNick and GPSStickRoll variable is contrarily to the stick values |
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283 | // in the flight.c. Therefore a positive north deviation/velocity should result in a positive |
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284 | // GPSStickNick and a positive east deviation/velocity should result in a negative GPSStickRoll. |
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285 | |||
286 | coscompass = (int32_t) c_cos_8192(YawGyroHeading / GYRO_DEG_FACTOR); |
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287 | sincompass = (int32_t) c_sin_8192(YawGyroHeading / GYRO_DEG_FACTOR); |
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288 | PID_Nick = (coscompass * PID_North + sincompass * PID_East) / 8192; |
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289 | PID_Roll = (sincompass * PID_North - coscompass * PID_East) / 8192; |
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290 | |||
291 | // limit resulting GPS control vector |
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292 | GPS_LimitXY(&PID_Nick, &PID_Roll, GPS_STICK_LIMIT); |
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293 | |||
294 | GPSStickNick = (int16_t) PID_Nick; |
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295 | GPSStickRoll = (int16_t) PID_Roll; |
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296 | } else { // invalid GPS data or bad compass reading |
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297 | GPS_Neutral(); // do nothing |
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1775 | - | 298 | // reset error integral |
299 | GPSPosDevIntegral_North = 0; |
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300 | GPSPosDevIntegral_East = 0; |
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1805 | - | 301 | } |
1612 | dongfang | 302 | } |
303 | |||
1775 | - | 304 | void GPS_Main(void) { |
1805 | - | 305 | static uint8_t GPS_P_Delay = 0; |
306 | static uint16_t beep_rythm = 0; |
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1612 | dongfang | 307 | |
1805 | - | 308 | GPS_UpdateParameter(); |
1612 | dongfang | 309 | |
1805 | - | 310 | // store home position if start of flight flag is set |
311 | if (MKFlags & MKFLAG_CALIBRATE) { |
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312 | if (GPS_SetCurrPosition(&HomePosition)) |
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313 | BeepTime = 700; |
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314 | } |
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315 | |||
316 | switch (GPSInfo.status) { |
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317 | case INVALID: // invalid gps data |
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1775 | - | 318 | GPS_Neutral(); |
1805 | - | 319 | if (FlightMode != GPS_FLIGHT_MODE_FREE) { |
320 | BeepTime = 100; // beep if signal is neccesary |
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321 | } |
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322 | break; |
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323 | case PROCESSED: // if gps data are already processed do nothing |
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324 | // downcount timeout |
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325 | if (GPSTimeout) |
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326 | GPSTimeout--; |
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327 | // if no new data arrived within timeout set current data invalid |
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328 | // and therefore disable GPS |
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329 | else { |
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1775 | - | 330 | GPS_Neutral(); |
1805 | - | 331 | GPSInfo.status = INVALID; |
332 | } |
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333 | break; |
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334 | case NEWDATA: // new valid data from gps device |
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335 | // if the gps data quality is good |
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336 | beep_rythm++; |
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337 | if (GPS_IsSignalOK()) { |
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338 | switch (FlightMode) { // check what's to do |
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339 | case GPS_FLIGHT_MODE_FREE: |
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340 | // update hold position to current gps position |
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341 | GPS_SetCurrPosition(&HoldPosition); // can get invalid if gps signal is bad |
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342 | // disable gps control |
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343 | GPS_Neutral(); |
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344 | break; |
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345 | |||
346 | case GPS_FLIGHT_MODE_AID: |
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347 | if (HoldPosition.Status != INVALID) { |
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348 | if (GPS_IsManualControlled()) { // MK controlled by user |
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349 | // update hold point to current gps position |
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350 | GPS_SetCurrPosition(&HoldPosition); |
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351 | // disable gps control |
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352 | GPS_Neutral(); |
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353 | GPS_P_Delay = 0; |
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354 | } else { // GPS control active |
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355 | if (GPS_P_Delay < 7) { |
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356 | // delayed activation of P-Part for 8 cycles (8*0.25s = 2s) |
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357 | GPS_P_Delay++; |
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358 | GPS_SetCurrPosition(&HoldPosition); // update hold point to current gps position |
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359 | GPS_PIDController(NULL); // activates only the D-Part |
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360 | } else |
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361 | GPS_PIDController(&HoldPosition);// activates the P&D-Part |
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362 | } |
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363 | } else // invalid Hold Position |
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364 | { // try to catch a valid hold position from gps data input |
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365 | GPS_SetCurrPosition(&HoldPosition); |
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366 | GPS_Neutral(); |
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367 | } |
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368 | break; |
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369 | |||
370 | case GPS_FLIGHT_MODE_HOME: |
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371 | if (HomePosition.Status != INVALID) { |
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372 | // update hold point to current gps position |
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373 | // to avoid a flight back if home comming is deactivated |
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374 | GPS_SetCurrPosition(&HoldPosition); |
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375 | if (GPS_IsManualControlled()) // MK controlled by user |
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376 | { |
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377 | GPS_Neutral(); |
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378 | } else // GPS control active |
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379 | { |
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380 | GPS_PIDController(&HomePosition); |
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381 | } |
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382 | } else // bad home position |
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383 | { |
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384 | BeepTime = 50; // signal invalid home position |
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385 | // try to hold at least the position as a fallback option |
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386 | |||
387 | if (HoldPosition.Status != INVALID) { |
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388 | if (GPS_IsManualControlled()) // MK controlled by user |
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389 | { |
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390 | GPS_Neutral(); |
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391 | } else // GPS control active |
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392 | { |
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393 | GPS_PIDController(&HoldPosition); |
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394 | } |
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395 | } else { // try to catch a valid hold position |
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396 | GPS_SetCurrPosition(&HoldPosition); |
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397 | GPS_Neutral(); |
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398 | } |
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399 | } |
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400 | break; // eof TSK_HOME |
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401 | default: // unhandled task |
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402 | GPS_Neutral(); |
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403 | break; // eof default |
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404 | } // eof switch GPS_Task |
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405 | } // eof gps data quality is good |
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406 | else // gps data quality is bad |
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407 | { // disable gps control |
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408 | GPS_Neutral(); |
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409 | if (FlightMode != GPS_FLIGHT_MODE_FREE) { |
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410 | // beep if signal is not sufficient |
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411 | if (!(GPSInfo.flags & FLAG_GPSFIXOK) && !(beep_rythm % 5)) |
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412 | BeepTime = 100; |
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1821 | - | 413 | else if (GPSInfo.satnum < staticParams.NaviGpsMinSat && !(beep_rythm |
414 | % 5)) |
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1805 | - | 415 | BeepTime = 10; |
416 | } |
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417 | } |
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418 | // set current data as processed to avoid further calculations on the same gps data |
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419 | GPSInfo.status = PROCESSED; |
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420 | break; |
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421 | } // eof GPSInfo.status |
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1612 | dongfang | 422 | } |
423 |