static err_t
low_level_output(struct netif *netif, struct pbuf *p)
{
struct pbuf *q;
int l = 0;
u8 *buffer = NULL;
SYS_ARCH_DECL_PROTECT(sr);
/* Interrupts are disabled through this whole thing to support multi-threading
transmit calls. Also this function might be called from an ISR. */
SYS_ARCH_PROTECT(sr);
buffer = (u8 *)ETH_GetCurrentTxBuffer();
for(q = p; q != NULL; q = q->next)
{
memcpy((u8_t*)&buffer[l], q->payload, q->len);
l = l + q->len;
}
ETH_TxPkt_ChainMode(l);
SYS_ARCH_UNPROTECT(sr);
return ERR_OK;
}
static err_t
low_level_output(struct netif *netif, struct pbuf *p)
{
static xSemaphoreHandle xTxSemaphore = NULL;
struct pbuf *q;
int l = 0;
u8 *buffer ;
if (xTxSemaphore == NULL)
{
vSemaphoreCreateBinary (xTxSemaphore);
}
if (xSemaphoreTake(xTxSemaphore, netifGUARD_BLOCK_TIME))
{
u8 *buffer = (u8 *)ETH_GetCurrentTxBuffer();
for(q = p; q != NULL; q = q->next)
{
memcpy((u8_t*)&buffer[l], q->payload, q->len);
l = l + q->len;
}
}
xSemaphoreGive(xTxSemaphore);
ETH_TxPkt_ChainMode(l);
return ERR_OK;
}
/*
* This function should do the actual transmission of the packet. The packet is
* contained in the pbuf that is passed to the function. This pbuf
* might be chained.
*
* @param netif the lwip network interface structure for this ethernetif
* @param p the MAC packet to send (e.g. IP packet including MAC addresses and type)
* @return ERR_OK if the packet could be sent
* an err_t value if the packet couldn't be sent
*
* @note Returning ERR_MEM here if a DMA queue of your MAC is full can lead to
* strange results. You might consider waiting for space in the DMA queue
* to become availale since the stack doesn't retry to send a packet
* dropped because of memory failure (except for the TCP timers).
*/
err_t low_level_output(struct netif *netif, struct pbuf *p)
{
struct pbuf *q;
int l = 0;
u8 *buffer = (u8 *)ETH_GetCurrentTxBuffer();
for (q = p; q != NULL; q = q->next) {
memcpy((u8_t*)&buffer[l], q->payload, q->len);
l = l + q->len;
}
ETH_TxPkt_ChainMode(l);
return ERR_OK;
}
