uint16_t net_receive(uint8_t *uipbuf)
{
uint32_t i;
FrameTypeDef frame;
__IO ETH_DMADESCTypeDef *DMARxNextDesc;
uint16_t len = 0;
if (ETH_CheckFrameReceived())
{
frame = ETH_Get_Received_Frame();
len = frame.length;
//printf("Frame length: %d\n", len);
// FIXME is it ok?
memcpy(uipbuf, frame.buffer, len);
/*
for (i = 0; i < len; i++)
{
printf("%x ", uipbuf[i]);
}
printf("\n");
printf("Copied to uipbuf\n");
*/
/* Release descriptors to DMA */
/* Check if frame with multiple DMA buffer segments */
if (DMA_RX_FRAME_infos->Seg_Count > 1)
{
DMARxNextDesc = DMA_RX_FRAME_infos->FS_Rx_Desc;
}
else
{
DMARxNextDesc = frame.descriptor;
}
/* Set Own bit in Rx descriptors: givrs the buffers back to DMA */
for (i = 0; i < DMA_RX_FRAME_infos->Seg_Count; i++)
{
DMARxNextDesc->Status = ETH_DMARxDesc_OWN;
DMARxNextDesc = (ETH_DMADESCTypeDef *)(DMARxNextDesc->Buffer2NextDescAddr);
}
/* Clear Segment_Count */
DMA_RX_FRAME_infos->Seg_Count = 0;
/* When Rx Buffer unavailable flag is set: clear it and resume reception */
if ((ETH->DMASR & ETH_DMASR_RBUS) != (uint32_t)RESET)
{
/* Clear RBUS ETHERNET DMA flag */
ETH->DMASR = ETH_DMASR_RBUS;
/* Resume DMA Reception */
ETH->DMARPDR = 0;
}
}
return len;
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this ethernetif
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf * low_level_input(struct netif *netif)
{
struct pbuf *p, *q;
u16_t len;
int l =0;
FrameTypeDef frame;
u8 *buffer;
uint32_t i=0;
__IO ETH_DMADESCTypeDef *DMARxNextDesc;
p = NULL;
/* get received frame */
frame = ETH_Get_Received_Frame();
/* Obtain the size of the packet and put it into the "len" variable. */
len = frame.length;
buffer = (u8 *)frame.buffer;
/* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
/* copy received frame to pbuf chain */
if (p != NULL)
{
for (q = p; q != NULL; q = q->next)
{
memcpy((u8_t*)q->payload, (u8_t*)&buffer[l], q->len);
l = l + q->len;
}
}
/* Release descriptors to DMA */
/* Check if frame with multiple DMA buffer segments */
if (DMA_RX_FRAME_infos->Seg_Count > 1)
{
DMARxNextDesc = DMA_RX_FRAME_infos->FS_Rx_Desc;
}
else
{
DMARxNextDesc = frame.descriptor;
}
/* Set Own bit in Rx descriptors: gives the buffers back to DMA */
for (i=0; i<DMA_RX_FRAME_infos->Seg_Count; i++)
{
DMARxNextDesc->Status = ETH_DMARxDesc_OWN;
DMARxNextDesc = (ETH_DMADESCTypeDef *)(DMARxNextDesc->Buffer2NextDescAddr);
}
/* Clear Segment_Count */
DMA_RX_FRAME_infos->Seg_Count =0;
/* When Rx Buffer unavailable flag is set: clear it and resume reception */
if ((ETH->DMASR & ETH_DMASR_RBUS) != (u32)RESET)
{
/* Clear RBUS ETHERNET DMA flag */
ETH->DMASR = ETH_DMASR_RBUS;
/* Resume DMA reception */
ETH->DMARPDR = 0;
}
return p;
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this ethernetif
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf * low_level_input(struct netif *netif)
{
struct pbuf *p, *q;
uint32_t len;
FrameTypeDef frame;
uint8_t *buffer;
__IO ETH_DMADESCTypeDef *DMARxDesc;
uint32_t bufferoffset = 0;
uint32_t payloadoffset = 0;
uint32_t byteslefttocopy = 0;
uint32_t i=0;
/* get received frame */
frame = ETH_Get_Received_Frame();
/* Obtain the size of the packet and put it into the "len" variable. */
len = frame.length;
buffer = (uint8_t *)frame.buffer;
/* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL)
{
DMARxDesc = frame.descriptor;
bufferoffset = 0;
for(q = p; q != NULL; q = q->next)
{
byteslefttocopy = q->len;
payloadoffset = 0;
/* Check if the length of bytes to copy in current pbuf is bigger than Rx buffer size*/
while( (byteslefttocopy + bufferoffset) > ETH_RX_BUF_SIZE )
{
/* Copy data to pbuf*/
memcpy( (uint8_t*)((uint8_t*)q->payload + payloadoffset), (uint8_t*)((uint8_t*)buffer + bufferoffset), (ETH_RX_BUF_SIZE - bufferoffset));
/* Point to next descriptor */
DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
buffer = (unsigned char *)(DMARxDesc->Buffer1Addr);
byteslefttocopy = byteslefttocopy - (ETH_RX_BUF_SIZE - bufferoffset);
payloadoffset = payloadoffset + (ETH_RX_BUF_SIZE - bufferoffset);
bufferoffset = 0;
}
/* Copy remaining data in pbuf */
memcpy( (u8_t*)((u8_t*)q->payload + payloadoffset), (u8_t*)((u8_t*)buffer + bufferoffset), byteslefttocopy);
bufferoffset = bufferoffset + byteslefttocopy;
}
}
/* Release descriptors to DMA */
DMARxDesc =frame.descriptor;
/* Set Own bit in Rx descriptors: gives the buffers back to DMA */
for (i=0; i<DMA_RX_FRAME_infos->Seg_Count; i++)
{
DMARxDesc->Status = ETH_DMARxDesc_OWN;
DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
}
/* Clear Segment_Count */
DMA_RX_FRAME_infos->Seg_Count =0;
/* When Rx Buffer unavailable flag is set: clear it and resume reception */
if ((ETH->DMASR & ETH_DMASR_RBUS) != (uint32_t)RESET)
{
/* Clear RBUS ETHERNET DMA flag */
ETH->DMASR = ETH_DMASR_RBUS;
/* Resume DMA reception */
ETH->DMARPDR = 0;
}
return p;
}
