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Added some information on the Library used
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Zachtek
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RFout1MHzV1_04/RFout1MHzV1_04.ino
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260
RFout1MHzV1_04/RFout1MHzV1_04.ino
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//Software for Zachtek "GPS Referenced RF generator 1MHz Out" with a 8MHz Mini Pro Arduno
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//This will program an NEO-6 Gps module at startup to output an RF signal when locked.
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//The NEO-6 has an internal 48MHz PLL that can be diveded down to any freq below 10MHz. Divide to a frequency that is an integer fraction of 48MHz to get
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//the lowest jitter
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//Examples on low jitter freqencies is 1, 2, 4 and 8 MHz
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//To compile you need to install the Library "NeoGps by SlashDevin", you can download it using The Library manager in the Arduino IDE
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//ZachTec 2017-2018
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//The Version of this software is stored in the constant "softwareversion" and is displayed on the Serialport att startup
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//For Arduino Pro Mini.
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#include <NMEAGPS.h> //NeoGps by SlashDEvin https://github.com/SlashDevin/NeoGPS
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#include <SoftwareSerial.h> // SoftwareSerial by Arduino
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SoftwareSerial gpsPort(2, 3); // RX, TX
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#define LEDIndicator1 5 //LED indicator for GPS Lock on pin A3
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#define FIXOut 4 //Pin Out at IDC. Indicator for GPS Lock on pin 4
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#define LDO_Enable A3 //GPS Voltage regulator Enable on pin A0
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boolean GPSOK;
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const char softwareversion[] = "1.04" ; //Version of this program, sent to serialport at startup
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NMEAGPS gps; // This parses the GPS characters
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gps_fix fix; // This holds on to the latest values
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//-------------------------- SETUP -----------------------
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void setup()
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{
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Serial.begin(9600);
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while (!Serial)
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;
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Serial.println("");
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Serial.print(F("Zachtek GPS referenced RF, Software version: "));
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Serial.println(softwareversion);
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pinMode(LDO_Enable, OUTPUT); // Set Voltage Regulator Enable pin as output.
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digitalWrite(LDO_Enable, HIGH); //Turn on 3.1V Power supply for the Ublox GPS module
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Serial.println (F("Turning on Voltage Regulator for GPS module"));
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pinMode(LEDIndicator1, OUTPUT); // Set GPS Lock LED pin as output.
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pinMode(FIXOut, OUTPUT); // Set GPS Lock line as output.
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digitalWrite(LEDIndicator1, LOW); //Turn off Lock LED
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digitalWrite(FIXOut, LOW); //Go low on Lock line
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delay(500);//Wait for GPSmodule to complete it's power on.
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gpsPort.begin(9600);
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GPSOK=true;
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//Program GPS to output RF
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if (setGPS_OutputFreq1MHz()) {
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Serial.println ("GPS Initialized to output RF at 1MHz");
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Serial.println ("Initialization is complete.");
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Serial.println ("");
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GPSOK=true;
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}
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else
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{
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Serial.println ("Error! Could not program GPS!");
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GPSOK=false;
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}
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}
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//--------------------------
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//-------------------------- Main loop -----------------------
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void loop()
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{
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while (gps.available( gpsPort )) {
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fix = gps.read();
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if (fix.valid.location && fix.valid.date && fix.valid.time)
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{
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Serial.print( F("Fix - Location: ") );
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digitalWrite(LEDIndicator1, HIGH); // turn the LED on
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digitalWrite(FIXOut, HIGH); // Set Lock Line high
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Serial.print( fix.latitude(), 6 );
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Serial.print( ',' );
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Serial.print( fix.longitude(), 6 );
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Serial.println();
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}
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else
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{
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if (GPSOK) { //If the GPS is connected but not locked then short blink
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digitalWrite(LEDIndicator1, HIGH); // turn the LED on
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digitalWrite(FIXOut, LOW); // Set Lock Line low
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delay(100);
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digitalWrite(LEDIndicator1, LOW); // turn the LED off
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Serial.println(F("Waiting for GPS location fix"));
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}
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}
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}
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}
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//--------------------------
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bool setGPS_OutputFreq100kHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0xA0, 0x86, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0xEF, 0x00, 0x00, 0x00, 0x20, 0x1B };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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bool setGPS_OutputFreq1MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x40, 0x42, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0xEF, 0x00, 0x00, 0x00, 0x8A, 0x8B };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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bool setGPS_OutputFreq2MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x80, 0x84, 0x1E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0xEF, 0x00, 0x00, 0x00, 0x1B, 0x7F };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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bool setGPS_OutputFreq4MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x32, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x00, 0x09, 0x3D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0xEF, 0x00, 0x00, 0x00, 0x3F, 0x8C };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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//8MHz is the highest low-jitter frequency possible
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bool setGPS_OutputFreq8MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x00, 0x12, 0x7A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0x6F, 0x00, 0x00, 0x00, 0xD4, 0x28 };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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//10 MHz is very jittery. Numbers that can be done with an integer division from 48MHz will produce
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//the lowest jitter so 16 ,12 ,8 ,6 ,4 ,2 and 1 MHz is low jitter but 10MHz is not
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//If 10MHz low jitter is needed then one option is to output 2MHz and then filter out the 5th overtone arriving at 10MHz in that way.
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bool setGPS_OutputFreq10MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x80, 0x96, 0x98, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0x6F, 0x00, 0x00, 0x00, 0xF6, 0x10 };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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//16MHz is above the specs for lUblox Neo-6, only included for experiments.
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//This will not produce as clean Square wave.
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bool setGPS_OutputFreq16MHz()
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{
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int gps_set_sucess=0;
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uint8_t setOutputFreq[] = {
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0xB5, 0x62, 0x06, 0x31, 0x20, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
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0x00, 0x00, 0x00, 0x24, 0xF4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
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0x00, 0x00, 0x6F, 0x00, 0x00, 0x00, 0x60, 0x12 };
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sendUBX(setOutputFreq, sizeof(setOutputFreq)/sizeof(uint8_t));
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gps_set_sucess=getUBX_ACK(setOutputFreq);
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//Serial.println("Set output Freq Done");
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return gps_set_sucess;
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}
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void sendUBX(uint8_t *MSG, uint8_t len) {
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gpsPort.flush();
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gpsPort.write(0xFF);
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_delay_ms(500);
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for(int i=0; i<len; i++) {
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gpsPort.write(MSG[i]);
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}
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}
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boolean getUBX_ACK(uint8_t *MSG) {
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uint8_t b;
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uint8_t ackByteID = 0;
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uint8_t ackPacket[10];
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unsigned long startTime = millis();
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// Construct the expected ACK packet
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ackPacket[0] = 0xB5; // header
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ackPacket[1] = 0x62; // header
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ackPacket[2] = 0x05; // class
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ackPacket[3] = 0x01; // id
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ackPacket[4] = 0x02; // length
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ackPacket[5] = 0x00;
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ackPacket[6] = MSG[2]; // ACK class
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ackPacket[7] = MSG[3]; // ACK id
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ackPacket[8] = 0; // CK_A
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ackPacket[9] = 0; // CK_B
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// Calculate the checksums
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for (uint8_t ubxi=2; ubxi<8; ubxi++) {
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ackPacket[8] = ackPacket[8] + ackPacket[ubxi];
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ackPacket[9] = ackPacket[9] + ackPacket[8];
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}
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while (1) { // Test for success
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if (ackByteID > 9) {
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// All packets in order!
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return true;
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}
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// Timeout if no valid response in 3 seconds
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if (millis() - startTime > 3000) {
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return false;
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}
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// Make sure data is available to read
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if (gpsPort.available()) {
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b = gpsPort.read();
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// Check that bytes arrive in sequence as per expected ACK packet
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if (b == ackPacket[ackByteID]) {
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ackByteID++;
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}
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else {
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ackByteID = 0; // Reset and look again, invalid order
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}//else
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}//If
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}//While
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}//getUBX_ACK
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