NXP LPC LWIP port documentation  v0.80
LWIP port for LPC devices
C:/lwip_lpc/nxpcommon/examples/ea1788_tcpecho_sa/source/configs/iram_zc/lpc_emac_config.h File Reference

PHY and EMAC configuration file. More...

#include "lwip/opt.h"

Go to the source code of this file.


#define LPC_PHY_LAN8720
 Enable the DP83848 PHY. Only 1 PHY type can be selected in a system. Comment out the define to remove the PHY. Uncomment to enable it.
 The PHY address connected the to MII/RMII.
#define PHY_USE_AUTONEG   1
 Enable autonegotiation mode. If this is enabled, the PHY will attempt to auto-negotiate the best link mode if the PHY supports it. If this is not enabled, the PHY_USE_FULL_DUPLEX and PHY_USE_100MBS defines will be used to select the link mode. Note that auto-negotiation may take a few seconds to complete.
 Sets up the PHY interface to either full duplex operation or half duplex operation if PHY_USE_AUTONEG is not enabled.
#define PHY_USE_100MBS   1
 Sets up the PHY interface to either 100MBS operation or 10MBS operation if PHY_USE_AUTONEG is not enabled.
#define LPC_EMAC_RMII   1
 Selects RMII or MII connection type in the EMAC peripheral.
 Set this define to '0' to use traditional copied buffers. If set to 0, receive buffers will be allocated statically for the EMAC interface per descriptor (LPC_NUM_BUFF_RXDESCS) and then copied into another allocated buffer that is passed to the network layer. If set to 1, receive buffers are allocated when needed for an empty receive descriptor and then sent directly to the network layer without a copy when a packet is received. New buffers must be allocated and re-queued for receive by periodically calling the lpc_rx_requeue() function.
 Defines the number of descriptors used for RX. A higher number of descriptors allows for more receive packets before rejecting them, but uses more memory. 1 buffer is allocated per descriptor. This must be a minimum value of 2.
 Set this define to '1' to enable zero-copy pbufs for transmit. If this is used, the EMAC driver will not create or use any local buffers - this can save lots of memory.
 Defines the number of descriptors used for TX. In zero-copy mode, this value designates the number of descriptors that can be assigned to buffers for transmit. When not in zero-copy mode, a buffer is also assigned to the descriptor, so memory use can be high if this value is set high. Use a low count when LPC_PBUF_TX_ZEROCOPY=0. Must be a minimum value of 2.
 Set this define to 1 to enable bounce buffers for transmit pbufs that cannot be sent via the zero-copy method. Some chained pbufs may have a payload address that links to an area of memory that cannot be used for transmit DMA operations. If this define is set to 1, an extra check will be made with the pbufs. If a buffer is determined to be non-usable for zero-copy, a temporary bounce buffer will be created and used instead.

Detailed Description

PHY and EMAC configuration file.

20 Nov. 2011
NXP MCU SW Application Team

Copyright(C) 2011, NXP Semiconductor All rights reserved.

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