private static void WriteSequentialBytes(Mcp23xxx mcp23xxx)
{
// This assumes the device is in default Sequential Operation mode.
Console.WriteLine("Write Sequential Bytes");
using (mcp23xxx)
{
void SequentialRead(Mcp23xxx mcp)
{
byte[] dataRead = mcp23xxx.Read(0, 2, Port.PortA, Bank.Bank0);
Console.WriteLine($"\tIODIRA: 0x{dataRead[0]:X2}");
Console.WriteLine($"\tIODIRB: 0x{dataRead[1]:X2}");
}
Console.WriteLine("Before Write");
SequentialRead(mcp23xxx);
byte[] dataWrite = new byte[] { 0x12, 0x34 };
mcp23xxx.Write(0, dataWrite, Port.PortA, Bank.Bank0);
Console.WriteLine("After Write");
SequentialRead(mcp23xxx);
dataWrite = new byte[] { 0xFF, 0xFF };
mcp23xxx.Write(0, dataWrite, Port.PortA, Bank.Bank0);
Console.WriteLine("After Writing Again");
SequentialRead(mcp23xxx);
}
}
private static void WriteIndividualByte(Mcp23xxx mcp23xxx)
{
// This assumes the device is in default Sequential Operation mode.
Console.WriteLine("Write Individual Byte");
using (mcp23xxx)
{
Register.Address address = Register.Address.IODIR;
void IndividualRead(Mcp23xxx mcp, Register.Address addressToRead)
{
byte[] dataRead = mcp23xxx.Read(addressToRead, 1, Port.PortB, Bank.Bank0);
Console.WriteLine($"\tIODIRB: 0x{dataRead[0]:X2}");
}
Console.WriteLine("Before Write");
IndividualRead(mcp23xxx, address);
byte[] dataWrite = new byte[] { 0x12 };
mcp23xxx.Write(address, dataWrite, Port.PortB, Bank.Bank0);
Console.WriteLine("After Write");
IndividualRead(mcp23xxx, address);
dataWrite = new byte[] { 0xFF };
mcp23xxx.Write(address, dataWrite, Port.PortB, Bank.Bank0);
Console.WriteLine("After Writing Again");
IndividualRead(mcp23xxx, address);
}
}
// This is now Read(pinNumber)
private static void ReadBits(Mcp23xxx mcp23xxx)
{
Console.WriteLine("Read Bits");
for (int bitNumber = 0; bitNumber < 8; bitNumber++)
{
PinValue bit = mcp23xxx.Read(bitNumber);
Console.WriteLine($"{bitNumber}: {bit}");
}
}
public void Read_GoodPin(TestDevice testDevice)
{
Mcp23xxx device = testDevice.Device;
for (int pin = 0; pin < testDevice.Device.PinCount; pin++)
{
bool first = pin < 8;
int register = testDevice.Device.PinCount == 16
? (first ? 0x12 : 0x13)
: 0x09;
// Flip the bit on (set the backing buffer directly to simulate incoming data)
testDevice.ChipMock.Registers[register] = (byte)(1 << (first ? pin : pin - 8));
Assert.Equal(PinValue.High, device.Read(pin));
// Clear the register
testDevice.ChipMock.Registers[register] = 0x00;
Assert.Equal(PinValue.Low, device.Read(pin));
}
}
private static void ReadAllRegisters(Mcp23xxx mcp23xxx)
{
// This assumes the device is in default Sequential Operation mode.
Console.WriteLine("Read All Registers");
using (mcp23xxx)
{
// Start at first register. Total of 22 registers for MCP23x17.
byte[] data = mcp23xxx.Read(0, 22, Port.PortA, Bank.Bank0);
for (int index = 0; index < data.Length; index++)
{
Console.WriteLine($"0x{index:X2}: 0x{data[index]:X2}");
}
}
}
private static void ReadSwitchesWriteLeds(Mcp23xxx mcp23xxx)
{
Console.WriteLine("Read Switches & Write LEDs");
using (mcp23xxx)
{
// Input direction for switches.
mcp23xxx.Write(Register.Address.IODIR, 0b1111_1111, Port.PortA, Bank.Bank0);
// Output direction for LEDs.
mcp23xxx.Write(Register.Address.IODIR, 0b0000_0000, Port.PortB, Bank.Bank0);
while (true)
{
// Read switches.
byte data = mcp23xxx.Read(Register.Address.GPIO, Port.PortA, Bank.Bank0);
// Write data to LEDs.
mcp23xxx.Write(Register.Address.GPIO, data, Port.PortB, Bank.Bank0);
Console.WriteLine(data);
Thread.Sleep(500);
}
}
}