public override void DigitalWrite(int gpioIndex, MadeInTheUSB.GPIO.PinState d)
{
this.SetGpioMask(ComputeMask(GetGpioMask(), gpioIndex, d));
}
public override void SetPullUp(int gpioIndex, MadeInTheUSB.GPIO.PinState d)
{
var mcpGpioIndex = gpioIndex - this.GpioStartIndex;
// only 8 bits!
if (mcpGpioIndex > 7)
throw new InvalidGpioOperationException(string.Format("Invalid gpio index:{0}", gpioIndex));
int gppu = this._i2c.Send1ByteRead1Byte(MCP230XX_GPPU);
if (gppu == -1)
throw new InvalidGpioOperationException(string.Format("Command MCP230XX_GPPU({0}) failed gpio index:{1}", MCP230XX_GPPU, gpioIndex));
if (d == GPIO.PinState.High)
{ // set the pin and direction
gppu |= (byte)(1 << mcpGpioIndex);
}
else
{
gppu &= (byte)(~(1 << mcpGpioIndex));
}
// write the new GPIO
this._i2c.Send2BytesCommand(MCP230XX_GPPU, (byte)gppu);
}
public virtual void SetPullUp(int p, MadeInTheUSB.GPIO.PinState d)
{
}
//public void SetGpioMask(byte mask)
//{
// SetGPIOMask(mask);
//}
public byte ComputeMask(byte mask, int gpioIndex, MadeInTheUSB.GPIO.PinState d)
{
var mcpIndex = gpioIndex - this.GpioStartIndex;
// only 8 bits!
if (mcpIndex > 7)
return mask;
int gpio = mask;
// set the pin and direction
if (d == GPIO.PinState.High)
{
gpio |= (byte)(1 << mcpIndex);
}
else
{
gpio &= (byte)(~(1 << mcpIndex));
}
return (byte)gpio;
}
public virtual void DigitalWrite(int p, MadeInTheUSB.GPIO.PinState d)
{
}
public void SetPinMode(byte gpioIndex, MadeInTheUSB.GPIO.PinMode mode)
{
var k = MCP230XX_Base.BuildGpioName(gpioIndex);
if (this.GPIOS.ContainsKey(k))
this.GPIOS[k].Mode = mode;
else
throw new ArgumentException(string.Format("Gpio {0} not available", gpioIndex));
var mcpIndex = gpioIndex - this.GpioStartIndex;
if (mcpIndex > (this.GetMaxGPIO()-1))
throw new ArgumentException(string.Format("Gpio {0} not available", gpioIndex));
int iodir = this._i2c.Send1ByteRead1Byte(MCP230XX_IODIR);
if (iodir == -1)
throw new ArgumentException(string.Format("Cannot read state of MCP230XX"));
if (mode == GPIO.PinMode.Input)
iodir |= (byte)(1 << mcpIndex);
else
iodir &= (byte)(~(1 << mcpIndex));
if (!this._i2c.Send2BytesCommand(MCP230XX_IODIR, (byte)iodir))
throw new ArgumentException(string.Format("Cannot set state of MCP230XX"));
}
public void SetPinMode(int p, MadeInTheUSB.GPIO.PinMode mode)
{
SetPinMode((byte)p, mode);
}
public void SetPinMode(string gpio, MadeInTheUSB.GPIO.PinMode mode)
{
SetPinMode(McpGpio.ExtractGpioIndex(gpio), mode);
}
public bool ValidateOperation(MadeInTheUSB.spi.SPIEngine.SPIResult result, ADDRESS address, COMMAND command, int? value = null)
{
var r = false;
// See datasheet http://exploringarduino.com/wp-content/uploads/2013/06/MCP4231-datasheet.pdf
// Page 48
// Value Function MOSI (SDI pin) MISO (SDO pin) (2)
// 00h Volatile Wiper 0 Write Data nn nnnn nnnn 0000 00nn nnnn nnnn 1111 1111 1111 1111
// Read Data nn nnnn nnnn 0000 11nn nnnn nnnn 1111 111n nnnn nnnn
// Increment Wiper — 0000 0100 1111 1111
// Decrement Wiper — 0000 1000 1111 1111
// 01h Volatile Wiper 1 Write Data nn nnnn nnnn 0001 00nn nnnn nnnn 1111 1111 1111 1111
// Read Data nn nnnn nnnn 0001 11nn nnnn nnnn 1111 111n nnnn nnnn
// Increment Wiper — 0001 0100 1111 1111
// Decrement Wiper — 0001 1000 1111 1111
// 02h Reserved — — — —
// 03h Reserved — — — —
// 04h Volatile
// TCON Register
// Write Data nn nnnn nnnn 0100 00nn nnnn nnnn 1111 1111 1111 1111
// Read Data nn nnnn nnnn 0100 11nn nnnn nnnn 1111 111n nnnn nnnn
// 05h Status Register Read Data nn nnnn nnnn 0101 11nn nnnn nnnn 1111 111n nnnn nnnn
// 06h-0Fh Reserved — — — —
// Note 1: The Data Memory is only 9-bits wide, so the MSb is ignored by the device.
// 2: All these Address/Command combinations are valid, so the CMDERR bit is s
switch (command)
{
case COMMAND.WRITE : r = (result.ReadBuffer.Count == 2) && (result.ReadBuffer[0] == 255) && result.ReadBuffer[1] == 255; break;
case COMMAND.DECREMENT :
case COMMAND.INCREMENT : r = (result.ReadBuffer.Count == 1) && (result.ReadBuffer[0] == 255); break;
case COMMAND.READ :
r = (result.ReadBuffer.Count == 2) && (result.ReadBuffer[0] >= 254);
if(r)
result.Value = result.ReadBuffer[1];
break;
}
return r;
}