Added powerSaveMode (and some minor corrections)

Author: PaulZC

examples/Example19_PowerSaveMode/Example19_PowerSaveMode.ino

@@ -0,0 +1,123 @@
+/*
+  Power Save Mode
+  By: Paul Clark (PaulZC)
+  Date: December 18th, 2019
+  
+  Based extensively on Example3_GetPosition
+  By: Nathan Seidle
+  SparkFun Electronics
+  Date: January 3rd, 2019
+  License: MIT. See license file for more information but you can
+  basically do whatever you want with this code.
+
+  This example shows how to put the Ublox module into power save mode and then
+  query its lat/long/altitude. We also turn off the NMEA output on the I2C port.
+  This decreases the amount of I2C traffic dramatically.
+
+  ** When it is able to ** the module will reduce its current draw.
+  For the ZOE-M8Q with a passive antenna, you should see the current drop
+  from (approx.) 25-28mA to (approx.) 9mA when power save mode kicks in.
+
+  Note: this will fail on the ZED (protocol version >= 27) as UBX-CFG-RXM is not supported
+
+  Note: Long/lat are large numbers because they are * 10^7. To convert lat/long
+  to something google maps understands simply divide the numbers by 10,000,000. We 
+  do this so that we don't have to use floating point numbers.
+
+  Leave NMEA parsing behind. Now you can simply ask the module for the datums you want!
+
+  Feel like supporting open source hardware?
+  Buy a board from SparkFun!
+  ZED-F9P RTK2: https://www.sparkfun.com/products/15136
+  NEO-M8P RTK: https://www.sparkfun.com/products/15005
+  SAM-M8Q: https://www.sparkfun.com/products/15106
+
+  Hardware Connections:
+  Plug a Qwiic cable into the GPS and a BlackBoard
+  If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
+  Open the serial monitor at 115200 baud to see the output
+*/
+
+#include <Wire.h> //Needed for I2C to GPS
+
+#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_Ublox_GPS
+SFE_UBLOX_GPS myGPS;
+
+long lastTime = 0; //Simple local timer. Limits amount if I2C traffic to Ublox module.
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial); //Wait for user to open terminal
+  Serial.println("SparkFun Ublox Example");
+
+  Wire.begin();
+
+  if (myGPS.begin() == false) //Connect to the Ublox module using Wire port
+  {
+    Serial.println(F("Ublox GPS not detected at default I2C address. Please check wiring. Freezing."));
+    while (1);
+  }
+
+  //myGPS.enableDebugging(); // Uncomment this line to enable debug messages
+
+  Serial.println(F("Waiting for a 3D fix..."));
+
+  byte fixType = 0;
+
+  while (fixType != 3) // Wait for a 3D fix
+  {
+    fixType = myGPS.getFixType(); // Get the fix type
+    Serial.print(F("Fix: "));
+    Serial.print(fixType);
+    if(fixType == 0) Serial.print(F(" = No fix"));
+    else if(fixType == 1) Serial.print(F(" = Dead reckoning"));
+    else if(fixType == 2) Serial.print(F(" = 2D"));
+    else if(fixType == 3) Serial.print(F(" = 3D"));
+    else if(fixType == 4) Serial.print(F(" = GNSS + Dead reckoning"));
+    Serial.println();
+    delay(1000);
+  }
+
+  Serial.println(F("3D fix found! Engaging power save mode..."));
+
+  // Put the GNSS into power save mode
+  // (If you want to disable power save mode, call myGPS.powerSaveMode(false) instead)
+  // This will fail on the ZED (protocol version >= 27) as UBX-CFG-RXM is not supported
+  if (myGPS.powerSaveMode())
+  {
+    Serial.println(F("Power Save Mode enabled."));
+  }
+  else
+  {
+    Serial.println(F("***!!! Power Save Mode FAILED !!!***"));
+  }
+
+  myGPS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
+  //myGPS.saveConfiguration(); //Uncomment this line to save the current settings to flash and BBR
+}
+
+void loop()
+{
+  //Query module every 10 seconds so it is easier to monitor the current draw
+  if (millis() - lastTime > 10000)
+  {
+    lastTime = millis(); //Update the timer
+    
+    long latitude = myGPS.getLatitude();
+    Serial.print(F("Lat: "));
+    Serial.print(latitude);
+
+    long longitude = myGPS.getLongitude();
+    Serial.print(F(" Long: "));
+    Serial.print(longitude);
+    Serial.print(F(" (degrees * 10^-7)"));
+
+    long altitude = myGPS.getAltitude();
+    Serial.print(F(" Alt: "));
+    Serial.print(altitude);
+    Serial.print(F(" (mm)"));
+
+    Serial.println();
+  }
+}

keywords.txt

@@ -125,6 +125,8 @@ addGeofence	KEYWORD2
 clearGeofences	KEYWORD2
 getGeofenceState	KEYWORD2
 
+powerSaveMode	KEYWORD2
+
 #######################################
 # Constants (LITERAL1)
 #######################################

src/SparkFun_Ublox_Arduino_Library.cpp

@@ -1789,6 +1789,53 @@ boolean SFE_UBLOX_GPS::getGeofenceState(geofenceState &currentGeofenceState, uin
   return(true);
 }
 
+//Power Save Mode
+//Enables/Disables Low Power Mode using UBX-CFG-RXM
+boolean SFE_UBLOX_GPS::powerSaveMode(bool power_save, uint16_t maxWait)
+{
+  // Let's begin by checking the Protocol Version as UBX_CFG_RXM is not supported on the ZED (protocol >= 27)
+  uint8_t protVer = getProtocolVersionHigh();
+  /*
+  if (_printDebug == true)
+  {
+    _debugSerial->print("Protocol version is ");
+    _debugSerial->println(protVer);
+  }
+  */
+  if (protVer >= 27)
+  {
+    debugPrintln((char *)"powerSaveMode (UBX-CFG-RXM) is not supported by this protocol version");
+    return (false);
+  }
+
+  // Now let's change the power setting using UBX-CFG-RXM
+  packetCfg.cls = UBX_CLASS_CFG;
+  packetCfg.id = UBX_CFG_RXM;
+  packetCfg.len = 0;
+  packetCfg.startingSpot = 0;
+
+  if (sendCommand(packetCfg, maxWait) == false) //Ask module for the current power management settings. Loads into payloadCfg.
+    return (false);
+
+  // Let's make sure we wait for the ACK too (sendCommand will have returned as soon as the module sent its response)
+  // This is only required because we are doing two sendCommands in quick succession using the same class and ID
+  waitForResponse(UBX_CLASS_CFG, UBX_CFG_RXM, 100); // But we'll only wait for 100msec max
+
+  if (power_save)
+  {
+    payloadCfg[1] = 1; // Power Save Mode
+  }
+  else
+  {
+    payloadCfg[1] = 0; // Continuous Mode
+  }
+	
+  packetCfg.len = 2;
+  packetCfg.startingSpot = 0;
+
+  return (sendCommand(packetCfg, maxWait)); //Wait for ack
+}
+
 //Given a spot in the payload array, extract four bytes and build a long
 uint32_t SFE_UBLOX_GPS::extractLong(uint8_t spotToStart)
 {
@@ -2133,7 +2180,7 @@ uint16_t SFE_UBLOX_GPS::getPDOP(uint16_t maxWait)
 uint8_t SFE_UBLOX_GPS::getProtocolVersionHigh(uint16_t maxWait)
 {
   if (moduleQueried.versionNumber == false)
-    getProtocolVersion();
+    getProtocolVersion(maxWait);
   moduleQueried.versionNumber = false;
   return (versionHigh);
 }
@@ -2143,7 +2190,7 @@ uint8_t SFE_UBLOX_GPS::getProtocolVersionHigh(uint16_t maxWait)
 uint8_t SFE_UBLOX_GPS::getProtocolVersionLow(uint16_t maxWait)
 {
   if (moduleQueried.versionNumber == false)
-    getProtocolVersion();
+    getProtocolVersion(maxWait);
   moduleQueried.versionNumber = false;
   return (versionLow);
 }
@@ -2166,6 +2213,10 @@ boolean SFE_UBLOX_GPS::getProtocolVersion(uint16_t maxWait)
     if (sendCommand(packetCfg, maxWait) == false)
       return (false); //If command send fails then bail
 
+	  // Let's make sure we wait for the ACK too (sendCommand will have returned as soon as the module sent its response)
+	  // This is only required because we are doing multiple sendCommands in quick succession using the same class and ID
+	  waitForResponse(UBX_CLASS_MON, UBX_MON_VER, 100); // But we'll only wait for 100msec max
+
     if (_printDebug == true)
     {
       _debugSerial->print("Extension ");
@@ -2185,7 +2236,7 @@ boolean SFE_UBLOX_GPS::getProtocolVersion(uint16_t maxWait)
     {
       versionHigh = (payloadCfg[8] - '0') * 10 + (payloadCfg[9] - '0');  //Convert '18' to 18
       versionLow = (payloadCfg[11] - '0') * 10 + (payloadCfg[12] - '0'); //Convert '00' to 00
-      return (versionLow);
+      return (true); // This function returns a boolean (so we can't return versionLow)
     }
   }
 

src/SparkFun_Ublox_Arduino_Library.h

@@ -99,6 +99,7 @@ const uint8_t UBX_CFG_PRT = 0x00;	//Used to configure port specifics
 const uint8_t UBX_CFG_RST = 0x04;	//Used to reset device
 const uint8_t UBX_CFG_RATE = 0x08;   //Used to set port baud rates
 const uint8_t UBX_CFG_CFG = 0x09;	//Used to save current configuration
+const uint8_t UBX_CFG_RXM = 0x11;	//Used to set receiver power management (power save mode)
 const uint8_t UBX_CFG_VALSET = 0x8A; //Used for config of higher version Ublox modules (ie protocol v27 and above)
 const uint8_t UBX_CFG_VALGET = 0x8B; //Used for config of higher version Ublox modules (ie protocol v27 and above)
 const uint8_t UBX_CFG_VALDEL = 0x8C; //Used for config of higher version Ublox modules (ie protocol v27 and above)
@@ -344,6 +345,9 @@ class SFE_UBLOX_GPS
   boolean clearGeofences(uint16_t maxWait = 2000); //Clears all geofences
   boolean getGeofenceState(geofenceState &currentGeofenceState, uint16_t maxWait = 2000);  //Returns the combined geofence state
 
+  //Power Save Mode
+  boolean powerSaveMode(bool power_save = true, uint16_t maxWait = 2000);
+
 	//Survey-in specific controls
 	struct svinStructure
 	{