102 lines
4.0 KiB
Arduino
102 lines
4.0 KiB
Arduino
/*
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Time Pulse Parameters
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By: Paul Clark (PaulZC)
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Date: January 13th, 2021
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License: MIT. See license file for more information but you can
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basically do whatever you want with this code.
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This example shows how to change the time pulse parameters and configure the TIMEPULSE (PPS)
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pin to produce a 1kHz squarewave
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The SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic) (https://www.sparkfun.com/products/16481)
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has solder pads which will let you connect an SMA connector to the TIMEPULSE signal. Need an
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accurate frequency or clock source for your latest project? This is the product for you!
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Feel like supporting open source hardware?
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Buy a board from SparkFun!
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ZED-F9P RTK2: https://www.sparkfun.com/products/15136
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NEO-M8P RTK: https://www.sparkfun.com/products/15005
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SAM-M8Q: https://www.sparkfun.com/products/15106
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Hardware Connections:
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Plug a Qwiic cable into the GNSS and a BlackBoard
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If you don't have a platform with a Qwiic connection use the SparkFun Qwiic Breadboard Jumper (https://www.sparkfun.com/products/14425)
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Open the serial monitor at 115200 baud to see the output
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*/
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#include <Wire.h> //Needed for I2C to GNSS
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#include "SparkFun_u-blox_GNSS_Arduino_Library.h" //http://librarymanager/All#SparkFun_u-blox_GNSS
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SFE_UBLOX_GNSS myGNSS;
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void setup()
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{
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Serial.begin(115200);
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while (!Serial)
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; //Wait for user to open terminal
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Serial.println(F("SparkFun u-blox Example"));
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Wire.begin();
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//myGNSS.enableDebugging(); // Uncomment this line to enable debug messages
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if (myGNSS.begin() == false) //Connect to the u-blox module using Wire port
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{
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Serial.println(F("u-blox GNSS not detected at default I2C address. Please check wiring. Freezing."));
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while (1)
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;
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}
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myGNSS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
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// Create storage for the time pulse parameters
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UBX_CFG_TP5_data_t timePulseParameters;
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// Get the time pulse parameters
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if (myGNSS.getTimePulseParameters(&timePulseParameters) == false)
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{
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Serial.println(F("getTimePulseParameters failed! Freezing..."));
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while (1) ; // Do nothing more
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}
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// Print the CFG TP5 version
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Serial.print(F("UBX_CFG_TP5 version: "));
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Serial.println(timePulseParameters.version);
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timePulseParameters.tpIdx = 0; // Select the TIMEPULSE pin
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//timePulseParameters.tpIdx = 1; // Or we could select the TIMEPULSE2 pin instead, if the module has one
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// We can configure the time pulse pin to produce a defined frequency or period
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// Here is how to set the frequency:
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// While the module is _locking_ to GNSS time, make it generate 2kHz
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timePulseParameters.freqPeriod = 2000; // Set the frequency/period to 2000Hz
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timePulseParameters.pulseLenRatio = 0x55555555; // Set the pulse ratio to 1/3 * 2^32 to produce 33:67 mark:space
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// When the module is _locked_ to GNSS time, make it generate 1kHz
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timePulseParameters.freqPeriodLock = 1000; // Set the frequency/period to 1000Hz
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timePulseParameters.pulseLenRatioLock = 0x80000000; // Set the pulse ratio to 1/2 * 2^32 to produce 50:50 mark:space
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timePulseParameters.flags.bits.active = 1; // Make sure the active flag is set to enable the time pulse. (Set to 0 to disable.)
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timePulseParameters.flags.bits.lockedOtherSet = 1; // Tell the module to use freqPeriod while locking and freqPeriodLock when locked to GNSS time
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timePulseParameters.flags.bits.isFreq = 1; // Tell the module that we want to set the frequency (not the period)
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timePulseParameters.flags.bits.isLength = 0; // Tell the module that pulseLenRatio is a ratio / duty cycle (* 2^-32) - not a length (in us)
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timePulseParameters.flags.bits.polarity = 1; // Tell the module that we want the rising edge at the top of second. (Set to 0 for falling edge.)
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// Now set the time pulse parameters
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if (myGNSS.setTimePulseParameters(&timePulseParameters) == false)
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{
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Serial.println(F("setTimePulseParameters failed!"));
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}
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else
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{
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Serial.println(F("Success!"));
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}
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}
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void loop()
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{
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// Nothing to do here
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}
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