private void RXInitialize()
{
var tmp = (uint)Cosmos.Core.Memory.Heap.Alloc(32 * 16 + 16);
RXDescs = (tmp % 16 != 0) ? (tmp + 16 - (tmp % 16)) : tmp;
for (uint i = 0; i < 32; i++)
{
RXDesc *desc = (RXDesc *)(RXDescs + (i * 16));
desc->addr = (uint)Cosmos.Core.Memory.Heap.Alloc(2048 + 16);
desc->status = 0;
}
WriteRegister(REG_RXDESCLO, RXDescs);
WriteRegister(REG_RXDESCHI, 0);
WriteRegister(REG_RXDESCLEN, 32 * 16);
WriteRegister(REG_RXDESCHEAD, 0);
WriteRegister(REG_RXDESCTAIL, 32 - 1);
WriteRegister(REG_RCTRL,
(1 << 1) | // Receiver Enable
(1 << 2) | // Store Bad Packets
(1 << 3) | // Unicast Promiscuous Enabled
(1 << 4) | // Multicast Promiscuous Enabled
(0 << 6) | // No Loopback
(0 << 8) | // Free Buffer Threshold is 1/2 of RDLEN
(1 << 15) | // Broadcast Accept Mode
(1 << 26) | // Strip Ethernet CRC
(0 << 16) //Buffer size of 2048 bytes
);
}
private void HandleIRQ(ref INTs.IRQContext aContext)
{
uint Status = ReadRegister(0xC0);
if ((Status & 0x04) != 0)
{
//Turn link up
LinkUp();
}
if ((Status & 0x10) != 0)
{
//Good threshold
}
if ((Status & 0x80) != 0)
{
uint _RXCurr = RXCurr;
RXDesc *desc = (RXDesc *)(RXDescs + (RXCurr * 16));
while ((desc->status & 0x1) != 0)
{
byte[] data = new byte[desc->length];
byte * ptr = (byte *)desc->addr;
for (int i = 0; i < desc->length; i++)
{
data[i] = ptr[i];
}
DataReceived(data);
desc->status = 0;
RXCurr = (RXCurr + 1) % 32;
WriteRegister(0x2818, _RXCurr);
}
}
}
