armfly/MiddleWare/lwip-2.0.2/port/STM32F4xx/UCOS_II/ethernetif.c

/**
 * @file
 * Ethernet Interface for standalone applications (without RTOS) - works only for
 * ethernet polling mode (polling for ethernet frame reception)
 *
 */

/*
 * 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 <[email protected]>
 *
 */

#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/mem.h"
#include "lwip/pbuf.h"
#include "lwip/timeouts.h"
#include "netif/etharp.h"
#include "lwip/err.h"
#include "ethernetif.h"

#include "main.h"
#include "stm32f4x7_eth.h"
#include <string.h>

#define ENET_RX_TASK_PRIO (4)
#define ENET_RX_TASK_STK_SIZE (2048)
CPU_STK enet_rx_task_stk[ENET_RX_TASK_STK_SIZE];

/* Network interface name */
#define IFNAME0 's'
#define IFNAME1 't'

/* Ethernet Rx & Tx DMA Descriptors */
extern ETH_DMADESCTypeDef DMARxDscrTab[ETH_RXBUFNB], DMATxDscrTab[ETH_TXBUFNB];

/* Ethernet Driver Receive buffers  */
extern uint8_t Rx_Buff[ETH_RXBUFNB][ETH_RX_BUF_SIZE];

/* Ethernet Driver Transmit buffers */
extern uint8_t Tx_Buff[ETH_TXBUFNB][ETH_TX_BUF_SIZE];

/* Global pointers to track current transmit and receive descriptors */
extern ETH_DMADESCTypeDef *DMATxDescToSet;
extern ETH_DMADESCTypeDef *DMARxDescToGet;

/* Global pointer for last received frame infos */
extern ETH_DMA_Rx_Frame_infos *DMA_RX_FRAME_infos;

static struct netif *low_netif = NULL;
OS_EVENT *g_enet_rx_sem = NULL;

static void ethernetif_input(void *pvParameters);
/**
 * 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)
{
#ifdef CHECKSUM_BY_HARDWARE
  int i;
#endif
  /* set MAC hardware address length */
  netif->hwaddr_len = ETHARP_HWADDR_LEN;

  /* set MAC hardware address */
  netif->hwaddr[0] = MAC_ADDR0;
  netif->hwaddr[1] = MAC_ADDR1;
  netif->hwaddr[2] = MAC_ADDR2;
  netif->hwaddr[3] = MAC_ADDR3;
  netif->hwaddr[4] = MAC_ADDR4;
  netif->hwaddr[5] = MAC_ADDR5;

  /* initialize MAC address in ethernet MAC */
  ETH_MACAddressConfig(ETH_MAC_Address0, netif->hwaddr);

  /* 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;

  /* 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_DMATxDescTransmitITConfig(&DMARxDscrTab[i], ENABLE);
    }
  }

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

  /* Note: TCP, UDP, ICMP checksum checking for received frame are enabled in DMA config */

  /* create the task that handles the ENET RX */
  // OSTaskCreateExt((void (*)(void *))ethernetif_input,
  //                 (void *)0,
  //                 (OS_STK *)&enet_rx_task_stk[ENET_RX_TASK_STK_SIZE - 1],
  //                 (INT8U)ENET_RX_TASK_PRIO,
  //                 (INT16U)ENET_RX_TASK_PRIO,
  //                 (OS_STK *)&enet_rx_task_stk[0],
  //                 (INT32U)ENET_RX_TASK_STK_SIZE,
  //                 (void *)0,
  //                 (INT16U)OS_TASK_OPT_STK_CHK | OS_TASK_OPT_STK_CLR | OS_TASK_OPT_SAVE_FP);

  /* 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)
{
  static OS_EVENT *p_enet_tx_sem = NULL;
  INT8U err;
  struct pbuf *q;
  uint8_t *buffer;
  FrameTypeDef frame;
  uint16_t framelength = 0;
  ErrorStatus reval = ERROR;
  SYS_ARCH_DECL_PROTECT(sr);

  if (NULL == p_enet_tx_sem)
  {
    p_enet_tx_sem = OSSemCreate(1);
  }

  OSSemPend(p_enet_tx_sem, 0, &err);

  SYS_ARCH_PROTECT(sr);

  while ((uint32_t)RESET != (DMATxDescToSet->Status & ETH_DMATxDesc_OWN))
  {
  }
  /* get received frame */
  frame = ETH_Get_Received_Frame();

  /* Obtain the size of the packet and put it into the "len" variable. */
  buffer = (u8 *)frame.buffer;

  for (q = p; q != NULL; q = q->next)
  {
    memcpy((uint8_t *)&buffer[framelength], q->payload, q->len);
    framelength = framelength + q->len;
  }

  /* Prepare transmit descriptors to give to DMA*/
  reval = ETH_Prepare_Transmit_Descriptors(framelength);

  SYS_ARCH_UNPROTECT(sr);

  /* give semaphore and exit */
  OSSemPost(p_enet_tx_sem);

  if (SUCCESS == reval)
  {
    return ERR_OK;
  }
  else
  {
    while (1)
    {
    }
  }
}

/**
 * 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 = NULL, *q;
  uint32_t l = 0;
  u16_t len;
  FrameTypeDef frame;
  uint8_t *buffer;

  /* get received frame */
  frame = ETH_Get_Received_Frame();

  /* Obtain the size of the packet and put it into the "len" variable. */
  len = frame.length;
  buffer = (u8 *)frame.buffer;

  if (len > 0)
  {
    /* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
    p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
  }

  if (p != NULL)
  {
    for (q = p; q != NULL; q = q->next)
    {
      memcpy((uint8_t *)q->payload, (u8_t *)&buffer[l], q->len);
      l = l + q->len;
    }
  }

  ETH_Get_Received_Frame_interrupt();

  return p;
}

// static struct pbuf *low_level_input(struct netif *netif)
// {
//   struct pbuf *p, *q;
//   uint32_t len;
//   FrameTypeDef frame;
//   u8 *buffer;
//   __IO ETH_DMADESCTypeDef *DMARxDesc;
//   uint32_t bufferoffset = 0;
//   uint32_t payloadoffset = 0;
//   uint32_t byteslefttocopy = 0;
//   uint32_t i = 0;

//   /* get received frame */
//   frame = ETH_Get_Received_Frame();

//   /* Obtain the size of the packet and put it into the "len" variable. */
//   len = frame.length;
//   buffer = (u8 *)frame.buffer;

//   /* We allocate a pbuf chain of pbufs from the Lwip buffer pool */
//   p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);

//   if (p != NULL)
//   {
//     DMARxDesc = frame.descriptor;
//     bufferoffset = 0;
//     for (q = p; q != NULL; q = q->next)
//     {
//       byteslefttocopy = q->len;
//       payloadoffset = 0;

//       /* Check if the length of bytes to copy in current pbuf is bigger than Rx buffer size*/
//       while ((byteslefttocopy + bufferoffset) > ETH_RX_BUF_SIZE)
//       {
//         /* Copy data to pbuf*/
//         memcpy((u8_t *)((u8_t *)q->payload + payloadoffset), (u8_t *)((u8_t *)buffer + bufferoffset), (ETH_RX_BUF_SIZE - bufferoffset));

//         /* Point to next descriptor */
//         DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
//         buffer = (unsigned char *)(DMARxDesc->Buffer1Addr);

//         byteslefttocopy = byteslefttocopy - (ETH_RX_BUF_SIZE - bufferoffset);
//         payloadoffset = payloadoffset + (ETH_RX_BUF_SIZE - bufferoffset);
//         bufferoffset = 0;
//       }
//       /* Copy remaining data in pbuf */
//       memcpy((u8_t *)((u8_t *)q->payload + payloadoffset), (u8_t *)((u8_t *)buffer + bufferoffset), byteslefttocopy);
//       bufferoffset = bufferoffset + byteslefttocopy;
//     }
//   }

//   /* Release descriptors to DMA */
//   DMARxDesc = frame.descriptor;

//   /* Set Own bit in Rx descriptors: gives the buffers back to DMA */
//   for (i = 0; i < DMA_RX_FRAME_infos->Seg_Count; i++)
//   {
//     DMARxDesc->Status = ETH_DMARxDesc_OWN;
//     DMARxDesc = (ETH_DMADESCTypeDef *)(DMARxDesc->Buffer2NextDescAddr);
//   }

//   /* Clear Segment_Count */
//   DMA_RX_FRAME_infos->Seg_Count = 0;

//   /* When Rx Buffer unavailable flag is set: clear it and resume reception */
//   if ((ETH->DMASR & ETH_DMASR_RBUS) != (u32)RESET)
//   {
//     /* Clear RBUS ETHERNET DMA flag */
//     ETH->DMASR = ETH_DMASR_RBUS;
//     /* Resume DMA reception */
//     ETH->DMARPDR = 0;
//   }
//   return p;
// }

/**
 * This function should be called when a packet is ready to be read
 * from the interface. It uses the function low_level_input() that
 * should handle the actual reception of bytes from the network
 * interface. Then the type of the received packet is determined and
 * the appropriate input function is called.
 *
 * @param netif the lwip network interface structure for this ethernetif
 */
void ethernetif_input(void *pvParameters)
{
  struct pbuf *p;
  INT8U err;

  SYS_ARCH_DECL_PROTECT(sr);

  for (;;)
  {

    OSSemPend(g_enet_rx_sem, 0, &err);

  TRY_GET_NEXT_FRAME:
    SYS_ARCH_PROTECT(sr);
    p = low_level_input(low_netif);
    SYS_ARCH_UNPROTECT(sr);

    if (p != NULL)
    {
      if (ERR_OK != low_netif->input(p, low_netif))
      {
        pbuf_free(p);
      }
      else
      {
        goto TRY_GET_NEXT_FRAME;
      }
    }
  }
}
// err_t ethernetif_input(struct netif *netif)
// {
//   err_t err;
//   struct pbuf *p;

//   /* move received packet into a new pbuf */
//   p = low_level_input(netif);

//   /* no packet could be read, silently ignore this */
//   if (p == NULL)
//     return ERR_MEM;

//   /* entry point to the LwIP stack */
//   err = netif->input(p, netif);

//   if (err != ERR_OK)
//   {
//     LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
//     pbuf_free(p);
//   }
//   return err;
// }

/**
 * Should be called at the beginning of the program to set up the
 * network interface. It calls the function low_level_init() to do the
 * actual setup of the hardware.
 *
 * This function should be passed as a parameter to netif_add().
 *
 * @param netif the lwip network interface structure for this ethernetif
 * @return ERR_OK if the loopif is initialized
 *         ERR_MEM if private data couldn't be allocated
 *         any other err_t on error
 */
err_t ethernetif_init(struct netif *netif)
{
  LWIP_ASSERT("netif != NULL", (netif != NULL));

#if LWIP_NETIF_HOSTNAME
  /* Initialize interface hostname */
  netif->hostname = "lwip";
#endif /* LWIP_NETIF_HOSTNAME */

  netif->name[0] = IFNAME0;
  netif->name[1] = IFNAME1;

  netif->output = etharp_output;
  netif->linkoutput = low_level_output;

  /* initialize the hardware */
  low_level_init(netif);

  return ERR_OK;
}