ethernetif.c

LWIP在STM32裸机上的移植

/**
 * @file
 * Ethernet Interface Skeleton
 *
 */

/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <[e-mail]>
 *
 */

/*
 * This file is a skeleton for developing Ethernet network interface
 * drivers for lwIP. Add code to the low_level functions and do a
 * search-and-replace for the word "ethernetif" to replace it with
 * something that better describes your network interface.
 */

#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/sys.h"
#include "lwip/stats.h"
#include "lwip/snmp.h"
#include "lwip/err.h"

#include "netif/etharp.h"
#include "netif/ppp_oe.h"

#include "ethernetif.h"

#include "stm32_eth.h"
#include <string.h>

/* TCP and ARP timeouts */
volatile int tcp_end_time, arp_end_time;

/* Define those to better describe your network interface. */
#define IFNAME0 's'
#define IFNAME1 't'

#define  ETH_DMARxDesc_FrameLengthShift           16
#define  ETH_ERROR              ((u32)0)
#define  ETH_SUCCESS            ((u32)1)

/**
 * Helper struct to hold private data used to operate your ethernet interface.
 * Keeping the ethernet address of the MAC in this struct is not necessary
 * as it is already kept in the struct netif.
 * But this is only an example, anyway...
 */
struct ethernetif
{
  struct eth_addr *ethaddr;
  /* Add whatever per-interface state that is needed here. */
  int unused;
};

/* Forward declarations. */
err_t  ethernetif_input(struct netif *netif);

#define ETH_RXBUFNB        4
#define ETH_TXBUFNB        2

uint8_t MACaddr[6];
ETH_DMADESCTypeDef  DMARxDscrTab[ETH_RXBUFNB], DMATxDscrTab[ETH_TXBUFNB];/* Ethernet Rx & Tx DMA Descriptors */
uint8_t Rx_Buff[ETH_RXBUFNB][ETH_MAX_PACKET_SIZE], Tx_Buff[ETH_TXBUFNB][ETH_MAX_PACKET_SIZE];/* Ethernet buffers */

ETH_DMADESCTypeDef  *DMATxDesc = DMATxDscrTab;
extern ETH_DMADESCTypeDef  *DMATxDescToSet;
extern ETH_DMADESCTypeDef  *DMARxDescToGet;

typedef struct{
u32 length;
u32 buffer;
ETH_DMADESCTypeDef *descriptor;
}FrameTypeDef;

FrameTypeDef ETH_RxPkt_ChainMode(void);
u32 ETH_GetCurrentTxBuffer(void);
u32 ETH_TxPkt_ChainMode(u16 FrameLength);


/**
 * Setting the MAC address.
 *
 * @param netif the already initialized lwip network interface structure
 *        for this ethernetif
 */
void Set_MAC_Address(uint8_t* macadd)
{
  MACaddr[0] = macadd[0];
  MACaddr[1] = macadd[1];
  MACaddr[2] = macadd[2];
  MACaddr[3] = macadd[3];
  MACaddr[4] = macadd[4];
  MACaddr[5] = macadd[5];
  
  ETH_MACAddressConfig(ETH_MAC_Address0, macadd);  
}

/**
 * In this function, the hardware should be initialized.
 * Called from ethernetif_init().
 *
 * @param netif the already initialized lwip network interface structure
 *        for this ethernetif
 */
static void
low_level_init(struct netif *netif)
{
  /* set MAC hardware address length */
  netif->hwaddr_len = ETHARP_HWADDR_LEN;

  /* set MAC hardware address */
  netif->hwaddr[0] =  MACaddr[0];
  netif->hwaddr[1] =  MACaddr[1];
  netif->hwaddr[2] =  MACaddr[2];
  netif->hwaddr[3] =  MACaddr[3];
  netif->hwaddr[4] =  MACaddr[4];
  netif->hwaddr[5] =  MACaddr[5];

  /* maximum transfer unit */
  netif->mtu = 1500;

  /* device capabilities */
  /* don't set NETIF_FLAG_ETHARP if this device is not an ethernet one */
  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_LINK_UP;

  /* Do whatever else is needed to initialize interface. */

  /* Initialize Tx Descriptors list: Chain Mode */
  ETH_DMATxDescChainInit(DMATxDscrTab, &Tx_Buff[0][0], ETH_TXBUFNB);
  /* Initialize Rx Descriptors list: Chain Mode  */
  ETH_DMARxDescChainInit(DMARxDscrTab, &Rx_Buff[0][0], ETH_RXBUFNB);

  /* Enable Ethernet Rx interrrupt */
  { int i;
    for(i=0; i<ETH_RXBUFNB; i++)
    {
      ETH_DMARxDescReceiveITConfig(&DMARxDscrTab[i], ENABLE);
    }
  }

#ifdef CHECKSUM_BY_HARDWARE
  /* Enable the checksum insertion for the Tx frames */
  { int i;
    for(i=0; i<ETH_TXBUFNB; i++)
    {
      ETH_DMATxDescChecksumInsertionConfig(&DMATxDscrTab[i], ETH_DMATxDesc_ChecksumTCPUDPICMPFull);
    }
  }
#endif

  /* Enable MAC and DMA transmission and reception */
  ETH_Start();

}

/**
 * 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).
 */

static err_t
low_level_output(struct netif *netif, struct pbuf *p)
{
  struct pbuf *q;
  int l = 0;
  u8 *buffer =  (u8 *)ETH_GetCurrentTxBuffer();

  /* Send the data from the pbuf to the interface, one pbuf at a time. 
     The size of the data in each pbuf is kept in the ->len variable. */  
  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;
}

/**
 * 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;
  
  p = NULL;
  frame = ETH_RxPkt_ChainMode();

  /* Obtain the size of the packet and put it into the "len"
     variable. */