Adding enableGNSS. This one is for @adamgarbo !

Author: PaulZC

src/SparkFun_Ublox_Arduino_Library.cpp

@@ -4176,6 +4176,34 @@ boolean SFE_UBLOX_GPS::resetOdometer(uint16_t maxWait)
   return (sendCommand(&packetCfg, maxWait) == SFE_UBLOX_STATUS_DATA_SENT); // We are only expecting an ACK
 }
 
+//Enable/Disable individual GNSS systems using UBX-CFG-GNSS
+boolean SFE_UBLOX_GPS::enableGNSS(boolean enable, sfe_ublox_gnss_ids_e id, uint16_t maxWait)
+{
+  packetCfg.cls = UBX_CLASS_NAV;
+  packetCfg.id = UBX_NAV_RESETODO;
+  packetCfg.len = 0;
+  packetCfg.startingSpot = 0;
+
+  if (sendCommand(&packetCfg, maxWait) != SFE_UBLOX_STATUS_DATA_RECEIVED) // We are expecting data and an ACK
+    return (false);
+
+  uint8_t numConfigBlocks = payloadCfg[3]; // Extract the numConfigBlocks
+
+  for (uint8_t id = 0; id < numConfigBlocks; id++) // Check each configuration block
+  {
+    if (payloadCfg[(id * 8) + 4] == (uint8_t)id) // Check the gnssId for this block. Do we have a match?
+    {
+      // We have a match so set/clear the enable bit in flags
+      if (enable)
+        payloadCfg[(id * 8) + 4 + 4] |= 0x01; // Set the enable bit in flags (Little Endian)
+      else
+        payloadCfg[(id * 8) + 4 + 4] &= 0xFE; // Clear the enable bit in flags (Little Endian)
+    }
+  }
+
+  return (sendCommand(&packetCfg, maxWait) == SFE_UBLOX_STATUS_DATA_SENT); // We are only expecting an ACK
+}
+
 // CONFIGURATION INTERFACE (protocol v27 and above)
 
 //Form 32-bit key from group/id/size

src/SparkFun_Ublox_Arduino_Library.h

@@ -393,6 +393,18 @@ enum dynModel // Possible values for the dynamic platform model, which provide m
 	DYN_MODEL_BIKE,			  // Supported in protocol versions 19.2
 };
 
+// The GNSS identifiers - used by UBX-CFG-GNSS (0x06 0x3E) GNSS system configuration
+enum sfe_ublox_gnss_ids_e
+{
+	SFE_UBLOX_GNSS_ID_GPS,
+	SFE_UBLOX_GNSS_ID_SBAS,
+	SFE_UBLOX_GNSS_ID_GALILEO,
+	SFE_UBLOX_GNSS_ID_BEIDOU,
+	SFE_UBLOX_GNSS_ID_IMES,
+	SFE_UBLOX_GNSS_ID_QZSS,
+	SFE_UBLOX_GNSS_ID_GLONASS
+};
+
 #ifndef MAX_PAYLOAD_SIZE
 // v2.0: keep this for backwards-compatibility, but this is largely superseded by setPacketCfgPayloadSize
 #define MAX_PAYLOAD_SIZE 256 //We need ~220 bytes for getProtocolVersion on most ublox modules
@@ -622,6 +634,11 @@ class SFE_UBLOX_GPS
 	//Reset the odometer
 	boolean resetOdometer(uint16_t maxWait = defaultMaxWait); // Reset the odometer
 
+	//Enable/Disable individual GNSS systems using UBX-CFG-GNSS
+	//Note: you must leave at least one major GNSS enabled! If in doubt, enable GPS before disabling the others
+	//TO DO: Add support for sigCfgMask and maxTrkCh. (Need to resolve ambiguity with maxWait)
+	boolean enableGNSS(boolean enable, sfe_ublox_gnss_ids_e id, uint16_t maxWait = defaultMaxWait);
+
 	//General configuration (used only on protocol v27 and higher - ie, ZED-F9P)
 
 	//It is probably safe to assume that users of the ZED-F9P will be using I2C / Qwiic.