Chapter 4. API Guides
Fig. 48: RX Buffer Allocation
• The Wi-Fi hardware receives a packet over the air and puts the packet content to the “Static Rx Buffer”,
which is also called “RX DMA Buffer”.
• The Wi-Fi driver allocates a “Dynamic Rx Buffer”, makes a copy of the “Static Rx Buffer”, and returns
the “Static Rx Buffer”to hardware.
• The Wi-Fi driver delivers the packet to the upper-layer (LwIP), and allocates a PBUF for holding the“Dynamic
Rx Buffer”.
• The application receives data from LwIP.
The diagram shows the configuration of the Wi-Fi internal buffer.
Espressif Systems 1552
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