Adding better time pulse examples (including bullet time)

2021-01-14 09:09:23 +00:00
parent 9467848bb2
commit 6529daaeb1
3 changed files with 229 additions and 1 deletions
@@ -0,0 +1,120 @@
+/*
+  Time Pulse Parameters - Bullet Time (https://en.wikipedia.org/wiki/Bullet_time)
+  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 pulse once per second but with an adjustable delay. You could use this to
+  trigger multiple cameras and replicate the "bullet time" effect.
+
+  The SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic) (https://www.sparkfun.com/products/16481)
+  has solder pads which will let you connect an SMA connector to the TIMEPULSE signal. Need an
+  accurate timelapse camera shutter signal? This is the product for you!
+
+  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
+  }
+
+  // Print the CFG TP5 version
+  Serial.print(F("UBX_CFG_TP5 version: "));
+  Serial.println(timePulseParameters.version);
+
+  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 period:
+
+  // Let's say that we want our pulse-per-second to be as accurate as possible. So, let's tell the module
+  // to generate no signal while it is _locking_ to GNSS time. We want the signal to start only when the module is
+  // _locked_ to GNSS time.
+  timePulseParameters.freqPeriod = 0; // Set the frequency/period to zero
+  timePulseParameters.pulseLenRatio = 0; // Set the pulse ratio to zero
+
+  // When the module is _locked_ to GNSS time, make it generate a 0.1 second pulse once per second
+  timePulseParameters.freqPeriodLock = 1000000; // Set the period to 1,000,000 us
+  timePulseParameters.pulseLenRatioLock = 100000; // Set the pulse length to 0.1s (100,000 us)
+  timePulseParameters.flags.bits.polarity = 1; // Set the polarity to "1" (high for 0.1s, low for 0.9s, rising edge at top of second)
+
+  // We can use userConfigDelay to delay the pulse for each camera. The delay needs to be negative for this example.
+  // We can delay the pulse by +/- 2^31 nanoseconds (+/- 2.147 seconds)
+  //timePulseParameters.userConfigDelay = 0; // Camera 1: delay the pulse by 0ns
+  //timePulseParameters.userConfigDelay = -100000000; // Camera 2: delay the pulse by 0.1s (100,000,000 ns)
+  //timePulseParameters.userConfigDelay = -200000000; // Camera 3: delay the pulse by 0.2s (200,000,000 ns)
+  timePulseParameters.userConfigDelay = -300000000; // Camera 4: delay the pulse by 0.3s (300,000,000 ns)
+  //timePulseParameters.userConfigDelay = -400000000; // Camera 5: delay the pulse by 0.4s (400,000,000 ns)
+  //timePulseParameters.userConfigDelay = -500000000; // Camera 6: delay the pulse by 0.5s (500,000,000 ns)
+  //timePulseParameters.userConfigDelay = -600000000; // Camera 7: delay the pulse by 0.6s (600,000,000 ns)
+  //timePulseParameters.userConfigDelay = -700000000; // Camera 8: delay the pulse by 0.7s (700,000,000 ns)
+  //timePulseParameters.userConfigDelay = -800000000; // Camera 9: delay the pulse by 0.8s (800,000,000 ns)
+  //timePulseParameters.userConfigDelay = -900000000; // Camera 10: delay the pulse by 0.9s (900,000,000 ns)
+
+  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.lockedOtherSet = 1; // Tell the module to use freqPeriod while locking and freqPeriodLock when locked to GNSS time
+  timePulseParameters.flags.bits.isFreq = 0; // Tell the module that we want to set the period (not the frequency)
+  timePulseParameters.flags.bits.isLength = 1; // Tell the module that pulseLenRatio is a length (in us) - not a duty cycle
+
+  // Now set the time pulse parameters
+  if (myGNSS.setTimePulseParameters(&timePulseParameters) == false)
+  {
+    Serial.println(F("setTimePulseParameters failed!"));
+  }
+  else
+  {
+    Serial.println(F("Success!"));
+  }
+
+  // Finally, save the time pulse parameters in battery-backed memory so the pulse will automatically restart at power on
+  myGNSS.saveConfigSelective(VAL_CFG_SUBSEC_NAVCONF); // Save the configuration
+}
+
+void loop()
+{
+  // Nothing to do here
+}
@@ -1,5 +1,5 @@
 /*
-  Time Pulse Parameters
+  Time Pulse Parameters - Frequency
  By: Paul Clark (PaulZC)
  Date: January 13th, 2021

@@ -0,0 +1,108 @@
+/*
+  Time Pulse Parameters - Period
+  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 1 second pulse every 30 seconds. What's really cool is that if you run this
+  example on two GNSS boards, the pulses are precisely synchronised!
+
+  The SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic) (https://www.sparkfun.com/products/16481)
+  has solder pads which will let you connect an SMA connector to the TIMEPULSE signal. Need an
+  accurate timelapse camera shutter signal? This is the product for you!
+
+  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
+  }
+
+  // Print the CFG TP5 version
+  Serial.print(F("UBX_CFG_TP5 version: "));
+  Serial.println(timePulseParameters.version);
+
+  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 period:
+
+  // Let's say that we want our 1 pulse every 30 seconds to be as accurate as possible. So, let's tell the module
+  // to generate no signal while it is _locking_ to GNSS time. We want the signal to start only when the module is
+  // _locked_ to GNSS time.
+  timePulseParameters.freqPeriod = 0; // Set the frequency/period to zero
+  timePulseParameters.pulseLenRatio = 0; // Set the pulse ratio to zero
+
+  // When the module is _locked_ to GNSS time, make it generate a 1 second pulse every 30 seconds
+  // (Although the period can be a maximum of 2^32 microseconds (over one hour), the upper limit appears to be around 33 seconds)
+  timePulseParameters.freqPeriodLock = 30000000; // Set the period to 30,000,000 us
+  timePulseParameters.pulseLenRatioLock = 1000000; // Set the pulse length to 1,000,000 us
+
+  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.lockedOtherSet = 1; // Tell the module to use freqPeriod while locking and freqPeriodLock when locked to GNSS time
+  timePulseParameters.flags.bits.isFreq = 0; // Tell the module that we want to set the period (not the frequency)
+  timePulseParameters.flags.bits.isLength = 1; // Tell the module that pulseLenRatio is a length (in us) - not a duty cycle
+  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.)
+
+  // Now set the time pulse parameters
+  if (myGNSS.setTimePulseParameters(&timePulseParameters) == false)
+  {
+    Serial.println(F("setTimePulseParameters failed!"));
+  }
+  else
+  {
+    Serial.println(F("Success!"));
+  }
+
+  // Finally, save the time pulse parameters in battery-backed memory so the pulse will automatically restart at power on
+  myGNSS.saveConfigSelective(VAL_CFG_SUBSEC_NAVCONF); // Save the configuration
+}
+
+void loop()
+{
+  // Nothing to do here
+}