low_level_output() function

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.

Syntax

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Summary

Declaration

from ethernetif.c:275

static err_t low_level_output(struct netif *netif, struct pbuf *p);

Arguments

Argument

Description

netif

the lwip network interface structure for this ethernetif

the MAC packet to send (e.g. IP packet including MAC addresses and type)

Return value

ERR_OK if the packet could be sent an err_t value if the packet couldn't be sent

Notes

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 available since the stack doesn't retry to send a packet dropped because of memory failure (except for the TCP timers).

Examples

References

from examples

low_level_output() function

Syntax

Arguments

Return value

Notes

Examples

References

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