Colin, as you have probably noticed there is not a lot of activity up on the forum. Some of us users try to help out when we can. I purchased the GIGA and display shield as a diversion from my normal diversions, which are Teensy boards (PJRC)...
It sometimes helps attract others to help, when more details are provided. So far, we only know that you have a sketch that faults using the Wire library.
Details like: What is your hardware setup. That is what do you have connected to the GIGA board? Display Shield? What I2C devices?
If you have I2C devices connected, are they setup for 3.3v? Or are they setup for the MEGA, which are most likely running at 5v.
Are there Pull Up resistors on the Wire Busses that you are using? If so what resistence. Note many devices may have ones built into them.
What have you tried? I am surprised that the Wire library here does not come with some form of Wire Scanner sketch example.
Here is one from the Teensy: Slightly modified to set how many wire busses that are defined.
// Wire Scanner - scans for I2C devices on all Wire ports
//
// This Wire library adapted is for Teensy boards
//
// https://github.com/PaulStoffregen/Wire/
//
// Adapted from I2C Scanner originally published on Arduino Playground
// see comments below for link and credits for original authors.
#include <Wire.h>
#define WIRE_INTERFACES_COUNT 3
void setup() {
#if WIRE_INTERFACES_COUNT >= 1
//Wire.setSCL(16); // uncomment these to use alternate Wire pins
//Wire.setSDA(17);
Wire.begin();
#endif
#if WIRE_INTERFACES_COUNT >= 2
Wire1.begin();
#endif
#if WIRE_INTERFACES_COUNT >= 3
Wire2.begin();
#endif
#if WIRE_INTERFACES_COUNT >= 4
Wire3.begin();
#endif
Serial.begin(9600);
while (!Serial); // Wait for Arduino Serial Monitor
Serial.println(F("\nI2C Scanner"));
}
void loop() {
Serial.println();
#if WIRE_INTERFACES_COUNT >= 1
Serial.println(F("Scanning Wire..."));
scan(Wire);
delay(500);
#endif
#if WIRE_INTERFACES_COUNT >= 2
Serial.println(F("Scanning Wire1..."));
scan(Wire1);
delay(500);
#endif
#if WIRE_INTERFACES_COUNT >= 3
Serial.println(F("Scanning Wire2..."));
scan(Wire2);
delay(500);
#endif
#if WIRE_INTERFACES_COUNT >= 4
Serial.println(F("Scanning Wire3..."));
scan(Wire3);
delay(500);
#endif
delay(5000); // wait 5 seconds for next scan
}
void scan(TwoWire &myport) {
int nDevices = 0;
for (int address = 1; address < 127; address++) {
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
myport.beginTransmission(address);
int error = myport.endTransmission();
if (error == 0) {
Serial.print(F("Device found at address 0x"));
if (address < 16) {
Serial.print("0");
}
Serial.print(address,HEX);
Serial.print(" (");
printKnownChips(address);
Serial.println(")");
nDevices++;
} else if (error==4) {
Serial.print(F("Unknown error at address 0x"));
if (address < 16) {
Serial.print("0");
}
Serial.println(address,HEX);
}
}
if (nDevices == 0) {
Serial.println(F("No I2C devices found"));
} else {
Serial.println(F("done"));
}
Serial.println();
}
void printKnownChips(byte address)
{
// Is this list missing part numbers for chips you use?
// Please suggest additions here:
// https://github.com/PaulStoffregen/Wire/issues/new
switch (address) {
case 0x00: Serial.print(F("AS3935")); break;
case 0x01: Serial.print(F("AS3935")); break;
case 0x02: Serial.print(F("AS3935")); break;
case 0x03: Serial.print(F("AS3935")); break;
case 0x04: Serial.print(F("ADAU1966")); break;
case 0x0A: Serial.print(F("SGTL5000")); break; // MCLK required
case 0x0B: Serial.print(F("SMBusBattery?")); break;
case 0x0C: Serial.print(F("AK8963")); break;
case 0x10: Serial.print(F("CS4272")); break;
case 0x11: Serial.print(F("Si4713")); break;
case 0x13: Serial.print(F("VCNL4000,AK4558")); break;
case 0x18: Serial.print(F("LIS331DLH")); break;
case 0x19: Serial.print(F("LSM303,LIS331DLH")); break;
case 0x1A: Serial.print(F("WM8731")); break;
case 0x1C: Serial.print(F("LIS3MDL")); break;
case 0x1D: Serial.print(F("LSM303D,LSM9DS0,ADXL345,MMA7455L,LSM9DS1,LIS3DSH")); break;
case 0x1E: Serial.print(F("LSM303D,HMC5883L,FXOS8700,LIS3DSH")); break;
case 0x20: Serial.print(F("MCP23017,MCP23008,PCF8574,FXAS21002,SoilMoisture")); break;
case 0x21: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
case 0x22: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
case 0x23: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
case 0x24: Serial.print(F("MCP23017,MCP23008,PCF8574,ADAU1966,HM01B0")); break;
case 0x25: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
case 0x26: Serial.print(F("MCP23017,MCP23008,PCF8574")); break;
case 0x27: Serial.print(F("MCP23017,MCP23008,PCF8574,LCD16x2,DigoleDisplay")); break;
case 0x28: Serial.print(F("BNO055,EM7180,CAP1188")); break;
case 0x29: Serial.print(F("TSL2561,VL6180,TSL2561,TSL2591,BNO055,CAP1188")); break;
case 0x2A: Serial.print(F("SGTL5000,CAP1188")); break;
case 0x2B: Serial.print(F("CAP1188")); break;
case 0x2C: Serial.print(F("MCP44XX ePot")); break;
case 0x2D: Serial.print(F("MCP44XX ePot")); break;
case 0x2E: Serial.print(F("MCP44XX ePot")); break;
case 0x2F: Serial.print(F("MCP44XX ePot")); break;
case 0x30: Serial.print(F("Si7210")); break;
case 0x31: Serial.print(F("Si7210")); break;
case 0x32: Serial.print(F("Si7210")); break;
case 0x33: Serial.print(F("MAX11614,MAX11615,Si7210,MLX90640,MLX90641")); break;
case 0x34: Serial.print(F("MAX11612,MAX11613")); break;
case 0x35: Serial.print(F("MAX11616,MAX11617")); break;
case 0x38: Serial.print(F("RA8875,FT6206,MAX98390")); break;
case 0x39: Serial.print(F("TSL2561, APDS9960")); break;
case 0x3A: Serial.print(F("MLX90632")); break;
case 0x3C: Serial.print(F("SSD1306,DigisparkOLED")); break;
case 0x3D: Serial.print(F("SSD1306")); break;
case 0x40: Serial.print(F("PCA9685,Si7021,MS8607")); break;
case 0x41: Serial.print(F("STMPE610,PCA9685")); break;
case 0x42: Serial.print(F("PCA9685")); break;
case 0x43: Serial.print(F("PCA9685")); break;
case 0x44: Serial.print(F("PCA9685, SHT3X, ADAU1966")); break;
case 0x45: Serial.print(F("PCA9685, SHT3X")); break;
case 0x46: Serial.print(F("PCA9685")); break;
case 0x47: Serial.print(F("PCA9685")); break;
case 0x48: Serial.print(F("ADS1115,PN532,TMP102,LM75,PCF8591,CS42448")); break;
case 0x49: Serial.print(F("ADS1115,TSL2561,PCF8591,CS42448,TC74A1")); break;
case 0x4A: Serial.print(F("ADS1115,Qwiic Keypad,CS42448")); break;
case 0x4B: Serial.print(F("ADS1115,TMP102,BNO080,Qwiic Keypad,CS42448")); break;
case 0x50: Serial.print(F("EEPROM,FRAM")); break;
case 0x51: Serial.print(F("EEPROM")); break;
case 0x52: Serial.print(F("Nunchuk,EEPROM")); break;
case 0x53: Serial.print(F("ADXL345,EEPROM")); break;
case 0x54: Serial.print(F("EEPROM")); break;
case 0x55: Serial.print(F("EEPROM")); break;
case 0x56: Serial.print(F("EEPROM")); break;
case 0x57: Serial.print(F("EEPROM")); break;
case 0x58: Serial.print(F("TPA2016,MAX21100")); break;
case 0x5A: Serial.print(F("MPR121,MLX90614")); break;
case 0x60: Serial.print(F("MPL3115,MCP4725,MCP4728,TEA5767,Si5351")); break;
case 0x61: Serial.print(F("MCP4725,AtlasEzoDO")); break;
case 0x62: Serial.print(F("LidarLite,MCP4725,AtlasEzoORP")); break;
case 0x63: Serial.print(F("MCP4725,AtlasEzoPH")); break;
case 0x64: Serial.print(F("AtlasEzoEC, ADAU1966")); break;
case 0x66: Serial.print(F("AtlasEzoRTD")); break;
case 0x68: Serial.print(F("DS1307,DS3231,MPU6050,MPU9050,MPU9250,ITG3200,ITG3701,LSM9DS0,L3G4200D")); break;
case 0x69: Serial.print(F("MPU6050,MPU9050,MPU9250,ITG3701,L3G4200D")); break;
case 0x6A: Serial.print(F("LSM9DS1")); break;
case 0x6B: Serial.print(F("LSM9DS0")); break;
case 0x6F: Serial.print(F("Qwiic Button")); break;
case 0x70: Serial.print(F("HT16K33,TCA9548A")); break;
case 0x71: Serial.print(F("SFE7SEG,HT16K33")); break;
case 0x72: Serial.print(F("HT16K33")); break;
case 0x73: Serial.print(F("HT16K33")); break;
case 0x76: Serial.print(F("MS5607,MS5611,MS5637,BMP280")); break;
case 0x77: Serial.print(F("BMP085,BMA180,BMP280,MS5611")); break;
case 0x7C: Serial.print(F("FRAM_ID")); break;
default: Serial.print(F("unknown chip"));
}
}
// --------------------------------------
// i2c_scanner
// https://playground.arduino.cc/Main/I2cScanner/
//
// Version 1
// This program (or code that looks like it)
// can be found in many places.
// For example on the Arduino.cc forum.
// The original author is not know.
// Version 2, Juni 2012, Using Arduino 1.0.1
// Adapted to be as simple as possible by Arduino.cc user Krodal
// Version 3, Feb 26 2013
// V3 by louarnold
// Version 4, March 3, 2013, Using Arduino 1.0.3
// by Arduino.cc user Krodal.
// Changes by louarnold removed.
// Scanning addresses changed from 0...127 to 1...119,
// according to the i2c scanner by Nick Gammon
// http://www.gammon.com.au/forum/?id=10896
// Version 5, March 28, 2013
// As version 4, but address scans now to 127.
// A sensor seems to use address 120.
// Version 6, November 27, 2015.
// Added waiting for the Leonardo serial communication.
//
//
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
//
Does it crash? Does it find your devices?
If it crashes, it really helps if you could then create an example (stripped down sketch) which demonstrates the issue, and then hopefully somone can help you debug it.
Sorry again, not much to go on here.
Good luck
