/*
  Time Pulse Parameters
  By: Paul Clark (PaulZC)
  Date: January 13th, 2021

  License: MIT. See license file for more information but you can
  basically do whatever you want with this code.

  This example shows how to change the time pulse parameters and configure the TIMEPULSE (PPS)
  pin to produce a 1kHz squarewave

  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 GNSS 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 GNSS

#include "SparkFun_u-blox_GNSS_Arduino_Library.h" //http://librarymanager/All#SparkFun_u-blox_GNSS
SFE_UBLOX_GNSS myGNSS;

void setup()
{
  Serial.begin(115200);
  while (!Serial)
    ; //Wait for user to open terminal
  Serial.println(F("SparkFun u-blox Example"));

  Wire.begin();

  //myGNSS.enableDebugging(); // Uncomment this line to enable debug messages

  if (myGNSS.begin() == false) //Connect to the u-blox module using Wire port
  {
    Serial.println(F("u-blox GNSS not detected at default I2C address. Please check wiring. Freezing."));
    while (1)
      ;
  }

  myGNSS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)

  // Create storage for the time pulse parameters
  UBX_CFG_TP5_data_t timePulseParameters;

  // Get the time pulse parameters
  if (myGNSS.getTimePulseParameters(&timePulseParameters) == false)
  {
    Serial.println(F("getTimePulseParameters failed! Freezing..."));
    while (1) ; // Do nothing more
  }

  timePulseParameters.tpIdx = 0; // Select the TIMEPULSE pin
  //timePulseParameters.tpIdx = 1; // Or we could select the TIMEPULSE2 pin instead, if the module has one

  // We can configure the time pulse pin to produce a defined frequency or period
  // Here is how to set the frequency:
  timePulseParameters.freqPeriod = 1000; // Set the frequency/period to 1000Hz
  timePulseParameters.pulseLenRatio = 0x80000000; // Set the pulse ratio to 2^31 * 2^-32 to produce 50:50 mark:space

  timePulseParameters.flags.bits.active = 1; // Make sure the active flag is set to enable the time pulse. (Set to 0 to disable.)
  timePulseParameters.flags.bits.isFreq = 1; // Tell the module that we want to set the frequency (not the period)
  timePulseParameters.flags.bits.isLength = 0; // Tell the module that pulseLenRatio is a ratio / duty cycle (2^-32) - not a length (in us)
  timePulseParameters.flags.bits.polarity = 0; // Tell the module that we want the falling edge at the top of second. (Set to 1 for rising edge.)

  // Now set the time pulse parameters
  if (myGNSS.setTimePulseParameters(&timePulseParameters) == false)
  {
    Serial.println(F("setTimePulseParameters failed!"));
  }
  else
  {
    Serial.println(F("Success!"));
  }
}

void loop()
{
  // Nothing to do here
}