public static MCP23017GpioController CreateDevice(string i2cBus, int address = HARDWARE_BASE_ADDRESS, I2cBusSpeed busSpeed = I2cBusSpeed.StandardMode, I2cSharingMode sharingMode = I2cSharingMode.Exclusive, IGpioPin interruptPin = null)
{
// Create the I2c connection settings instance.
I2cConnectionSettings settings = new I2cConnectionSettings(address)
{
BusSpeed = busSpeed, SharingMode = sharingMode
};
// Create the I2c device instance
var i2cDevice = I2cDevice.FromId(i2cBus, settings);
if (i2cDevice == null)
{
// No device was created
throw new Exception("Unable to create I2c instance.");
}
try
{
var instance = new MCP23017GpioController(i2cDevice, interruptPin);
// Set the defaults for our device. These are power on defaults
instance.WriteRegister(MCP23017_IODIRA, 0xFF);
instance.WriteRegister(MCP23017_IPOLA, 0x00);
instance.WriteRegister(MCP23017_GPINTENA, 0x00);
instance.WriteRegister(MCP23017_DEFVALA, 0x00);
instance.WriteRegister(MCP23017_INTCONA, 0x00);
instance.WriteRegister(MCP23017_IOCONA, 0x00);
instance.WriteRegister(MCP23017_GPPUA, 0x00);
instance.WriteRegister(MCP23017_GPIOA, 0x00);
instance.WriteRegister(MCP23017_OLATA, 0x00);
instance.WriteRegister(MCP23017_IODIRB, 0xFF);
instance.WriteRegister(MCP23017_IPOLB, 0x00);
instance.WriteRegister(MCP23017_GPINTENB, 0x00);
instance.WriteRegister(MCP23017_DEFVALB, 0x00);
instance.WriteRegister(MCP23017_INTCONB, 0x00);
instance.WriteRegister(MCP23017_IOCONB, 0x00);
instance.WriteRegister(MCP23017_GPPUB, 0x00);
instance.WriteRegister(MCP23017_GPIOB, 0x00);
instance.WriteRegister(MCP23017_OLATB, 0x00);
return(instance);
}
catch (Exception)
{
i2cDevice?.Dispose();
throw;
}
}
internal MCP23017GpioPin(MCP23017GpioController gpioController, int pinNumber, GpioSharingMode sharingMode)
{
_gpioController = gpioController;
PinNumber = pinNumber;
SharingMode = sharingMode;
}
