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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2039 | - | 1 | #include <inttypes.h> |
| 2 | #include "ubx.h" |
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| 3 | #include <avr/io.h> |
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| 2058 | - | 4 | #include "output.h" |
| 2039 | - | 5 | |
| 6 | // ubx protocol parser state machine |
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| 7 | #define UBXSTATE_IDLE 0 |
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| 8 | #define UBXSTATE_SYNC1 1 |
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| 9 | #define UBXSTATE_SYNC2 2 |
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| 10 | #define UBXSTATE_CLASS 3 |
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| 11 | #define UBXSTATE_LEN1 4 |
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| 12 | #define UBXSTATE_LEN2 5 |
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| 13 | #define UBXSTATE_DATA 6 |
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| 14 | #define UBXSTATE_CKA 7 |
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| 15 | #define UBXSTATE_CKB 8 |
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| 16 | |||
| 17 | // ublox protocoll identifier |
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| 18 | #define UBX_CLASS_NAV 0x01 |
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| 19 | |||
| 20 | #define UBX_ID_POSLLH 0x02 |
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| 21 | #define UBX_ID_SOL 0x06 |
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| 22 | #define UBX_ID_VELNED 0x12 |
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| 23 | |||
| 24 | #define UBX_SYNC1_CHAR 0xB5 |
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| 25 | #define UBX_SYNC2_CHAR 0x62 |
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| 26 | |||
| 27 | typedef struct { |
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| 28 | uint32_t ITOW; // ms GPS Millisecond Time of Week |
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| 2044 | - | 29 | int32_t frac; // ns remainder of rounded ms above |
| 2039 | - | 30 | int16_t week; // GPS week |
| 31 | uint8_t GPSfix; // GPSfix Type, range 0..6 |
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| 2044 | - | 32 | uint8_t flags; // Navigation Status Flags |
| 2039 | - | 33 | int32_t ECEF_X; // cm ECEF X coordinate |
| 34 | int32_t ECEF_Y; // cm ECEF Y coordinate |
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| 35 | int32_t ECEF_Z; // cm ECEF Z coordinate |
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| 2044 | - | 36 | uint32_t pAcc; // cm 3D Position Accuracy Estimate |
| 2039 | - | 37 | int32_t ECEFVX; // cm/s ECEF X velocity |
| 38 | int32_t ECEFVY; // cm/s ECEF Y velocity |
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| 39 | int32_t ECEFVZ; // cm/s ECEF Z velocity |
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| 2044 | - | 40 | uint32_t sAcc; // cm/s Speed Accuracy Estimate |
| 2039 | - | 41 | uint16_t PDOP; // 0.01 Position DOP |
| 42 | uint8_t res1; // reserved |
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| 43 | uint8_t numSV; // Number of SVs used in navigation solution |
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| 44 | uint32_t res2; // reserved |
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| 2044 | - | 45 | Status_t status; |
| 2039 | - | 46 | } UBX_SOL_t; |
| 47 | |||
| 48 | typedef struct { |
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| 49 | uint32_t ITOW; // ms GPS Millisecond Time of Week |
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| 2044 | - | 50 | int32_t lon; // 1e-07 deg Longitude |
| 51 | int32_t lat; // 1e-07 deg Latitude |
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| 52 | int32_t height; // mm Height above Ellipsoid |
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| 2039 | - | 53 | int32_t HMSL; // mm Height above mean sea level |
| 2044 | - | 54 | uint32_t hAcc; // mm Horizontal Accuracy Estimate |
| 55 | uint32_t vAacc; // mm Vertical Accuracy Estimate |
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| 56 | Status_t status; |
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| 2039 | - | 57 | } UBX_POSLLH_t; |
| 58 | |||
| 59 | typedef struct { |
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| 60 | uint32_t ITOW; // ms GPS Millisecond Time of Week |
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| 61 | int32_t VEL_N; // cm/s NED north velocity |
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| 62 | int32_t VEL_E; // cm/s NED east velocity |
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| 63 | int32_t VEL_D; // cm/s NED down velocity |
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| 2044 | - | 64 | uint32_t speed; // cm/s Speed (3-D) |
| 65 | uint32_t gSpeed; // cm/s Ground Speed (2-D) |
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| 66 | int32_t heading; // 1e-05 deg Heading 2-D |
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| 67 | uint32_t sAcc; // cm/s Speed Accuracy Estimate |
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| 68 | uint32_t cAcc; // deg Course / Heading Accuracy Estimate |
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| 69 | Status_t status; |
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| 2039 | - | 70 | } UBX_VELNED_t; |
| 71 | |||
| 2044 | - | 72 | UBX_SOL_t ubxSol = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, INVALID }; |
| 73 | UBX_POSLLH_t ubxPosLlh = { 0, 0, 0, 0, 0, 0, 0, INVALID }; |
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| 74 | UBX_VELNED_t ubxVelNed = { 0, 0, 0, 0, 0, 0, 0, 0, 0, INVALID }; |
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| 2039 | - | 75 | GPS_INFO_t GPSInfo = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, INVALID }; |
| 76 | |||
| 77 | volatile uint8_t GPSTimeout = 0; |
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| 2058 | - | 78 | volatile uint16_t GPSDatasetCounter = 0; |
| 2039 | - | 79 | |
| 80 | void updateGPSInfo(void) { |
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| 2058 | - | 81 | if ((ubxSol.status == NEWDATA) && (ubxPosLlh.status == NEWDATA) && (ubxVelNed.status == NEWDATA)) { |
| 2039 | - | 82 | //RED_FLASH; |
| 83 | // DebugOut.Digital ....blah... |
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| 84 | if (GPSInfo.status != NEWDATA) { |
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| 2058 | - | 85 | GPSDatasetCounter++; |
| 2039 | - | 86 | GPSInfo.status = INVALID; |
| 87 | // NAV SOL |
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| 2044 | - | 88 | GPSInfo.flags = ubxSol.flags; |
| 89 | GPSInfo.satfix = ubxSol.GPSfix; |
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| 90 | GPSInfo.satnum = ubxSol.numSV; |
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| 91 | GPSInfo.PAcc = ubxSol.pAcc; |
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| 92 | GPSInfo.VAcc = ubxSol.sAcc; |
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| 2039 | - | 93 | // NAV POSLLH |
| 2044 | - | 94 | GPSInfo.longitude = ubxPosLlh.lon; |
| 95 | GPSInfo.latitude = ubxPosLlh.lat; |
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| 96 | GPSInfo.altitude = ubxPosLlh.height; |
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| 2039 | - | 97 | |
| 2044 | - | 98 | GPSInfo.veleast = ubxVelNed.VEL_E; |
| 99 | GPSInfo.velnorth = ubxVelNed.VEL_N; |
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| 2051 | - | 100 | GPSInfo.veltop = -ubxVelNed.VEL_D; |
| 2044 | - | 101 | GPSInfo.velground = ubxVelNed.gSpeed; |
| 2039 | - | 102 | |
| 103 | GPSInfo.status = NEWDATA; |
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| 104 | } |
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| 105 | |||
| 106 | // set state to collect new data |
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| 2044 | - | 107 | ubxSol.status = PROCESSED; // never update old data |
| 108 | ubxPosLlh.status = PROCESSED; // never update old data |
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| 109 | ubxVelNed.status = PROCESSED; // never update old data |
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| 2039 | - | 110 | } |
| 111 | } |
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| 112 | |||
| 113 | // this function should be called within the UART RX ISR |
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| 114 | void ubx_parser(uint8_t c) { |
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| 115 | static uint8_t ubxstate = UBXSTATE_IDLE; |
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| 116 | static uint8_t cka, ckb; |
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| 117 | static uint16_t msglen; |
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| 118 | static int8_t *ubxP, *ubxEp, *ubxSp; // pointers to data currently transfered |
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| 119 | |||
| 120 | switch (ubxstate) { |
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| 121 | case UBXSTATE_IDLE: // check 1st sync byte |
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| 122 | if (c == UBX_SYNC1_CHAR) |
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| 123 | ubxstate = UBXSTATE_SYNC1; |
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| 124 | else |
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| 125 | ubxstate = UBXSTATE_IDLE; // out of synchronization |
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| 126 | break; |
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| 127 | |||
| 128 | case UBXSTATE_SYNC1: // check 2nd sync byte |
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| 129 | if (c == UBX_SYNC2_CHAR) |
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| 130 | ubxstate = UBXSTATE_SYNC2; |
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| 131 | else |
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| 132 | ubxstate = UBXSTATE_IDLE; // out of synchronization |
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| 133 | break; |
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| 134 | |||
| 135 | case UBXSTATE_SYNC2: // check msg class to be NAV |
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| 136 | if (c == UBX_CLASS_NAV) |
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| 137 | ubxstate = UBXSTATE_CLASS; |
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| 138 | else |
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| 139 | ubxstate = UBXSTATE_IDLE; // unsupported message class |
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| 140 | break; |
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| 141 | |||
| 142 | case UBXSTATE_CLASS: // check message identifier |
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| 143 | switch (c) { |
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| 144 | case UBX_ID_POSLLH: // geodetic position |
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| 2044 | - | 145 | ubxP = (int8_t *) &ubxPosLlh; // data start pointer |
| 146 | ubxEp = (int8_t *) (&ubxPosLlh + 1); // data end pointer |
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| 147 | ubxSp = (int8_t *) &ubxPosLlh.status; // status pointer |
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| 2039 | - | 148 | break; |
| 149 | |||
| 150 | case UBX_ID_SOL: // navigation solution |
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| 2044 | - | 151 | ubxP = (int8_t *) &ubxSol; // data start pointer |
| 152 | ubxEp = (int8_t *) (&ubxSol + 1); // data end pointer |
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| 153 | ubxSp = (int8_t *) &ubxSol.status; // status pointer |
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| 2039 | - | 154 | break; |
| 155 | |||
| 156 | case UBX_ID_VELNED: // velocity vector in tangent plane |
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| 2044 | - | 157 | ubxP = (int8_t *) &ubxVelNed; // data start pointer |
| 158 | ubxEp = (int8_t *) (&ubxVelNed + 1); // data end pointer |
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| 159 | ubxSp = (int8_t *) &ubxVelNed.status; // status pointer |
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| 2039 | - | 160 | break; |
| 161 | |||
| 162 | default: // unsupported identifier |
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| 163 | ubxstate = UBXSTATE_IDLE; |
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| 164 | break; |
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| 165 | } |
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| 166 | if (ubxstate != UBXSTATE_IDLE) { |
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| 167 | ubxstate = UBXSTATE_LEN1; |
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| 168 | cka = UBX_CLASS_NAV + c; |
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| 169 | ckb = UBX_CLASS_NAV + cka; |
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| 170 | } |
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| 171 | break; |
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| 172 | |||
| 173 | case UBXSTATE_LEN1: // 1st message length byte |
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| 174 | msglen = c; |
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| 175 | cka += c; |
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| 176 | ckb += cka; |
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| 177 | ubxstate = UBXSTATE_LEN2; |
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| 178 | break; |
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| 179 | |||
| 180 | case UBXSTATE_LEN2: // 2nd message length byte |
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| 181 | msglen += ((uint16_t) c) << 8; |
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| 182 | cka += c; |
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| 183 | ckb += cka; |
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| 184 | // if the old data are not processed so far then break parsing now |
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| 185 | // to avoid writing new data in ISR during reading by another function |
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| 186 | if (*ubxSp == NEWDATA) { |
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| 187 | updateGPSInfo(); //update GPS info respectively |
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| 188 | ubxstate = UBXSTATE_IDLE; |
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| 2058 | - | 189 | } else {// data invalid or already processd |
| 2039 | - | 190 | *ubxSp = INVALID; |
| 191 | ubxstate = UBXSTATE_DATA; |
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| 192 | } |
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| 193 | break; |
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| 194 | |||
| 195 | case UBXSTATE_DATA: |
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| 196 | if (ubxP < ubxEp) |
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| 197 | *ubxP++ = c; // copy curent data byte if any space is left |
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| 198 | cka += c; |
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| 199 | ckb += cka; |
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| 200 | if (--msglen == 0) |
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| 201 | ubxstate = UBXSTATE_CKA; // switch to next state if all data was read |
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| 202 | break; |
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| 203 | |||
| 204 | case UBXSTATE_CKA: |
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| 205 | if (c == cka) |
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| 206 | ubxstate = UBXSTATE_CKB; |
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| 207 | else { |
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| 208 | *ubxSp = INVALID; |
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| 209 | ubxstate = UBXSTATE_IDLE; |
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| 210 | } |
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| 211 | break; |
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| 212 | |||
| 213 | case UBXSTATE_CKB: |
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| 214 | if (c == ckb) { |
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| 215 | *ubxSp = NEWDATA; // new data are valid |
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| 216 | updateGPSInfo(); //update GPS info respectively |
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| 217 | GPSTimeout = 255; |
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| 218 | } else { // if checksum not match then set data invalid |
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| 219 | *ubxSp = INVALID; |
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| 220 | } |
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| 221 | ubxstate = UBXSTATE_IDLE; // ready to parse new data |
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| 222 | break; |
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| 223 | |||
| 224 | default: // unknown ubx state |
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| 225 | ubxstate = UBXSTATE_IDLE; |
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| 226 | break; |
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| 227 | } |
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| 228 | } |