public void GoToNextDescriptor()
{
if (descriptors.Count == 0)
{
// this is the first descriptor - read it from baseAddress
descriptors.Add(creator(bus, baseAddress));
}
else
{
var shouldInvalidate = true;
CurrentDescriptor.Update();
if (CurrentDescriptor.Wrap)
{
currentDescriptorIndex = 0;
}
else
{
if (currentDescriptorIndex == descriptors.Count - 1)
{
// we need to generate new descriptor
descriptors.Add(creator(bus, CurrentDescriptor.BaseAddress + DmaBufferDescriptor.LengthInBytes));
// there is no need to invalidate newly created descriptor as it is invalidated in the constructor
shouldInvalidate = false;
}
currentDescriptorIndex++;
}
if (shouldInvalidate)
{
CurrentDescriptor.Invalidate();
}
}
}
public void GoToNextDescriptor()
{
if (descriptors.Count == 0)
{
// this is the first descriptor - read it from baseAddress
descriptors.Add(creator(bus, baseAddress));
currentDescriptorIndex = 0;
}
else
{
// If wrap is set, we have reached end of ring and need to start from the beginning
if (CurrentDescriptor.Wrap)
{
currentDescriptorIndex = 0;
}
else
{
descriptors.Add(creator(bus, CurrentDescriptor.DescriptorAddress + CurrentDescriptor.SizeInBytes));
currentDescriptorIndex++;
}
}
CurrentDescriptor.Read();
}
public void GoToBaseAddress()
{
currentDescriptorIndex = 0;
CurrentDescriptor.Read();
}