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minimal NMEA support for 4.5 (#13044)
* minimal NMEA * fix a typo thanks Karate
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ctzsnooze
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1 changed files with 36 additions and 95 deletions
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@ -101,17 +101,15 @@ typedef struct gpsInitData_s {
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uint8_t index;
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uint8_t baudrateIndex; // see baudRate_e
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const char *ubx;
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const char *mtk;
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} gpsInitData_t;
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// NMEA will cycle through these until valid data is received
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// UBX will cycle through these until valid data is received
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static const gpsInitData_t gpsInitData[] = {
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{ GPS_BAUDRATE_115200, BAUD_115200, "$PUBX,41,1,0003,0001,115200,0*1E\r\n", "$PMTK251,115200*1F\r\n" },
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{ GPS_BAUDRATE_57600, BAUD_57600, "$PUBX,41,1,0003,0001,57600,0*2D\r\n", "$PMTK251,57600*2C\r\n" },
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{ GPS_BAUDRATE_38400, BAUD_38400, "$PUBX,41,1,0003,0001,38400,0*26\r\n", "$PMTK251,38400*27\r\n" },
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{ GPS_BAUDRATE_19200, BAUD_19200, "$PUBX,41,1,0003,0001,19200,0*23\r\n", "$PMTK251,19200*22\r\n" },
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// 9600 is not enough for 5Hz updates - leave for compatibility to dumb NMEA that only runs at this speed
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{ GPS_BAUDRATE_9600, BAUD_9600, "$PUBX,41,1,0003,0001,9600,0*16\r\n", "" }
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{ GPS_BAUDRATE_115200, BAUD_115200, "$PUBX,41,1,0003,0001,115200,0*1E\r\n" },
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{ GPS_BAUDRATE_57600, BAUD_57600, "$PUBX,41,1,0003,0001,57600,0*2D\r\n" },
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{ GPS_BAUDRATE_38400, BAUD_38400, "$PUBX,41,1,0003,0001,38400,0*26\r\n" },
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{ GPS_BAUDRATE_19200, BAUD_19200, "$PUBX,41,1,0003,0001,19200,0*23\r\n" },
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{ GPS_BAUDRATE_9600, BAUD_9600, "$PUBX,41,1,0003,0001,9600,0*16\r\n" }
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};
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#define GPS_INIT_DATA_ENTRY_COUNT ARRAYLEN(gpsInitData)
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@ -339,8 +337,6 @@ typedef enum {
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baudRate_e initBaudRateIndex;
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size_t initBaudRateCycleCount;
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static void ubloxSendClassMessage(ubxProtocolBytes_e class_id, ubxProtocolBytes_e msg_id, uint16_t length);
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#endif // USE_GPS_UBLOX
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gpsData_t gpsData;
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@ -953,111 +949,57 @@ void setSatInfoMessageRate(uint8_t divisor)
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#ifdef USE_GPS_NMEA
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void gpsConfigureNmea(void)
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{
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static bool atgmRestartDone = false;
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#if !defined(GPS_NMEA_TX_ONLY)
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#endif
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// minimal support for NMEA, we only:
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// - set the FC's GPS port to the user's configured rate, and
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// - send any NMEA custom commands to the GPS Module
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// the user must configure the power-up baud rate of the module to be fast enough for their data rate
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// Note: we always parse all incoming NMEA messages
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DEBUG_SET(DEBUG_GPS_CONNECTION, 4, (gpsData.state * 100 + gpsData.state_position));
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// wait 500ms between changes
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if (cmp32(gpsData.now, gpsData.state_ts) < 500) {
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return;
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}
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gpsData.state_ts = gpsData.now;
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// Check that the GPS transmit buffer is empty
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if (!isSerialTransmitBufferEmpty(gpsPort)) {
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return;
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}
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switch (gpsData.state) {
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case GPS_STATE_DETECT_BAUD:
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#if !defined(GPS_NMEA_TX_ONLY)
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if (cmp32(gpsData.now, gpsData.state_ts) < 1000) {
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return;
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}
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gpsData.state_ts = gpsData.now;
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switch (gpsData.state_position) {
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case 0: // first run after bootup
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serialSetBaudRate(gpsPort, 4800);
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gpsData.state_position++;
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break;
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case 1: // second run
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// print the init string for the baudrate we want to be at
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serialPrint(gpsPort, "$PSRF100,1,115200,8,1,0*05\r\n");
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gpsData.state_position++;
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break;
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default:
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// we're now (hopefully) at the correct rate, next state should switch to it
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// TO DO: Check that this actually works, it seems broken at present
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gpsData.state_position = 0;
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gpsSetState(GPS_STATE_CHANGE_BAUD);
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break;
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}
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// no attempt to read the baud rate of the GPS module, or change it
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gpsSetState(GPS_STATE_CHANGE_BAUD);
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break;
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#endif
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case GPS_STATE_CHANGE_BAUD:
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#if !defined(GPS_NMEA_TX_ONLY)
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// wait a short time between sending commands
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// note that no commands are sent to request the packets we need
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if (cmp32(gpsData.now, gpsData.state_ts) < 500) {
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return;
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}
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gpsData.state_ts = gpsData.now;
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if (gpsData.state_position < 1) { // first run after boot up
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if (gpsData.state_position < 1) {
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// set the FC's baud rate to the user's configured baud rate
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serialSetBaudRate(gpsPort, baudRates[gpsInitData[gpsData.userBaudRateIndex].baudrateIndex]);
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gpsData.state_position++;
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} else if (gpsData.state_position < 2) {
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// *** this message also appears to fail ***//
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// NMEA reports back at whatever speed the module is configured to send at, not 5Hz
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serialPrint(gpsPort, "$PSRF103,00,6,00,0*23\r\n"); // set GGA rate to 5Hz
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gpsData.state_position++;
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} else if (gpsData.state_position < 3) {
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// special initialization for NMEA ATGM336 and similar GPS recivers - should be done only once
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if (!atgmRestartDone) {
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atgmRestartDone = true;
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serialPrint(gpsPort, "$PCAS02,100*1E\r\n"); // 10Hz refresh rate
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serialPrint(gpsPort, "$PCAS10,0*1C\r\n"); // hot restart
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}
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gpsData.state_position++;
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} else if (gpsData.state_position < 4) {
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#ifdef USE_GPS_UBLOX
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// try to disable UBlox NAV-PVT and NAV-SAT, using ValSet, to which M9 or above should respond
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ubloxSetMessageRateValSet(CFG_MSGOUT_UBX_NAV_PVT_UART1, 0);
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ubloxSetMessageRateValSet(CFG_MSGOUT_UBX_NAV_SAT_UART1, 0);
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#endif
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gpsData.state_position++;
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} else if (gpsData.state_position < 5) {
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#ifdef USE_GPS_UBLOX
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// try to disable UBX NAV-PVT, NAV-SAT and NAV_SVINFO, to which M7 and M8 should respond
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ubloxSetMessageRate(CLASS_NAV, MSG_NAV_PVT, 0);
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ubloxSetMessageRate(CLASS_NAV, MSG_NAV_SAT, 0);
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ubloxSetMessageRate(CLASS_NAV, MSG_NAV_SVINFO, 0);
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#endif
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gpsData.state_position++;
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} else if (gpsData.state_position < 6) {
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if (!(isConfiguratorConnected())) {
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// disable GSV MESSAGES
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// *** THIS COMMAND FAILS TO DISABLE GSV MESSAGES WHEN SENT ****
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// bug?? why??
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serialPrint(gpsPort, "$PSRF103,03,00,00,01*27\r\n"); // disable GSV (Sat info) messages
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// *** BUT THE UBLOX EQUIVALENT WORKS ****
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// so I'll send both for now...
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ubloxSetMessageRate(CLASS_NMEA_STD, MSG_NMEA_GSV, 0);
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}
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gpsData.state_position++;
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} else if (gpsData.state_position < 7) {
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// NMEA custom commands after ATGM336 initialization
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// send NMEA custom commands to select which messages being sent, data rate etc
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// use PUBX, MTK, SiRF or GTK format commands, depending on module type
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static int commandOffset = 0;
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const char *commands = gpsConfig()->nmeaCustomCommands;
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const char *cmd = commands + commandOffset;
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// skip leading whitespaces and get first command length
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int commandLen;
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while (*cmd && (commandLen = strcspn(cmd, " \0")) == 0) {
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cmd++; // skip separators
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}
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if (*cmd) {
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// Send the current command to the GPS
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serialWriteBuf(gpsPort, (uint8_t *)cmd, commandLen);
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serialWriteBuf(gpsPort, (uint8_t *)"\r\n", 2);
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// Move to the next command
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cmd += commandLen;
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}
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// skip trailing whitespaces
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while (*cmd && strcspn(cmd, " \0") == 0) cmd++;
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if (*cmd) {
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// more commands to send
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commandOffset = cmd - commands;
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@ -1065,14 +1007,13 @@ void gpsConfigureNmea(void)
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gpsData.state_position++;
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commandOffset = 0;
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}
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} else
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#else
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{
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serialSetBaudRate (gpsPort, baudRates[gpsInitData[gpsData.userBaudRateIndex].baudrateIndex]);
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gpsData.state_position++;
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gpsSetState(GPS_STATE_RECEIVING_DATA);
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}
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#endif
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#else // !GPS_NMEA_TX_ONLY
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gpsSetState(GPS_STATE_RECEIVING_DATA);
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break;
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#endif // !GPS_NMEA_TX_ONLY
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break;
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}
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}
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#endif // USE_GPS_NMEA
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