private void HandleInterrupt(ref INTs.IRQContext aContext)
{
ushort sr = pTransferStatus.Word;
if ((sr & IRQ_LVBCI) > 0)
{
// Last Valid Buffer interrupt
pTransferStatus.Word = IRQ_LVBCI;
}
else if ((sr & IRQ_BCIS) > 0)
{
// Load a buffer ahead
int next = lastValidIdx + 1;
if (next >= BUFFER_COUNT)
{
next -= BUFFER_COUNT;
}
BufferProvider.RequestBuffer(transferBuffer);
fixed(byte *mainBufPtr = transferBuffer.RawData)
{
MemoryOperations.Copy(
dest: bufferDescriptorList[next].pointer,
src: mainBufPtr,
size: bufferSizeBytes
);
}
// Set the index to the current one
lastValidIdx++;
if (lastValidIdx == BUFFER_COUNT)
{
lastValidIdx = 0;
}
pLastValidEntry.Byte = lastValidIdx;
pTransferStatus.Word = IRQ_BCIS;
}
else if ((sr & IRQ_FIFO_ERROR) > 0)
{
pTransferStatus.Word = IRQ_FIFO_ERROR;
}
}