public void CacheInvalidatesWhenReset(TestDevice testDevice)
{
Mcp23xxx device = testDevice.Device;
// Check the output latches after enabling and setting
// different bits.
device.Enable();
device.Write(0, PinValue.High);
Assert.Equal(1, device.ReadByte(Register.OLAT));
device.Write(1, PinValue.High);
Assert.Equal(3, device.ReadByte(Register.OLAT));
// Flush OLAT
device.WriteByte(Register.OLAT, 0x00);
Assert.Equal(0, device.ReadByte(Register.OLAT));
// Now setting the next bit will pick back up our cached 3
device.Write(2, PinValue.High);
Assert.Equal(7, device.ReadByte(Register.OLAT));
// Re-enabling will reset the cache
device.WriteByte(Register.OLAT, 0x00);
device.Disable();
device.Enable();
device.Write(3, PinValue.High);
Assert.Equal(8, device.ReadByte(Register.OLAT));
device.WriteByte(Register.OLAT, 0x02);
device.Disable();
device.Enable();
device.Write(0, PinValue.High);
Assert.Equal(3, device.ReadByte(Register.OLAT));
}
public void CacheInvalidatesWhenReset(TestDevice testDevice)
{
Mcp23xxx device = testDevice.Device;
GpioController controller = testDevice.Controller;
// Check the output latches after enabling and setting
// different bits.
device.Enable();
for (int i = 0; i < 4; i++)
{
controller.OpenPin(i, PinMode.Output);
}
controller.Write(0, PinValue.High);
Assert.Equal(1, device.ReadByte(Register.OLAT));
controller.Write(1, PinValue.High);
Assert.Equal(3, device.ReadByte(Register.OLAT));
// Flush OLAT
device.WriteByte(Register.OLAT, 0x00);
Assert.Equal(0, device.ReadByte(Register.OLAT));
// Now setting the next bit will pick back up our cached 3
controller.Write(2, PinValue.High);
Assert.Equal(7, device.ReadByte(Register.OLAT));
// Re-enabling will reset the cache
device.WriteByte(Register.OLAT, 0x00);
device.Disable();
device.Enable();
controller.Write(3, PinValue.High);
Assert.Equal(8, device.ReadByte(Register.OLAT));
device.WriteByte(Register.OLAT, 0x02);
device.Disable();
device.Enable();
controller.Write(0, PinValue.High);
Assert.Equal(3, device.ReadByte(Register.OLAT));
}