Posted on May 31, 2015 at 01:33Hello!
I am looking for an overhead free solution for UDP data streaming.
Today I am able to stream UDP data from SPI->DMA->MEM->ETH, using pbuf by
Ref:
TaskUdpStreamErr = netbuf_ref(buf, dataPointer, TASK_UDP_STREAM_PACKET_SIZE);
// dataPointer is filled by the DMA and shared with the with other tasks
The issue is
that I want to add a one byte header to the UDP packet, but I want to avoid copying from one memory to another AND I want to avoid packet fragmentation.
so I tried this hack:
TaskUdpStreamErr = netbuf_ref(buf, dataPointer, TASK_UDP_STREAM_PACKET_SIZE + 1);
buf->p->flags = 0x80 | (i << 5) | ci;
-- And in the low_level_output():
if (q->flags & 0x80)
{
*((uint8_t*)buffer + bufferoffset) = q->flags;
bufferoffset += 1;
byteslefttocopy -= 1;
}
Problem is that it will fail on the CRC...
1. Is there a way to disable the CRC? is it a valid solution?
2. What other solution do you suggest?
