基于STM32构建EtherCAT主站（SOEM方案）5

这里讲一下soem的网卡驱动

大小端序

ethercattype.h文件夹里有一些关于大端序、小端序的宏定义。

#if !defined(EC_BIG_ENDIAN) && defined(EC_LITTLE_ENDIAN)

  #define htoes(A) (A)
  #define htoel(A) (A)
  #define htoell(A) (A)
  #define etohs(A) (A)
  #define etohl(A) (A)
  #define etohll(A) (A)

#elif !defined(EC_LITTLE_ENDIAN) && defined(EC_BIG_ENDIAN)

  #define htoes(A) ((((uint16)(A) & 0xff00) >> 8) | \
                    (((uint16)(A) & 0x00ff) << 8))
  #define htoel(A) ((((uint32)(A) & 0xff000000) >> 24) | \
                    (((uint32)(A) & 0x00ff0000) >> 8)  | \
                    (((uint32)(A) & 0x0000ff00) << 8)  | \
                    (((uint32)(A) & 0x000000ff) << 24))
  #define htoell(A) ((((uint64)(A) & (uint64)0xff00000000000000ULL) >> 56) | \
                     (((uint64)(A) & (uint64)0x00ff000000000000ULL) >> 40) | \
                     (((uint64)(A) & (uint64)0x0000ff0000000000ULL) >> 24) | \
                     (((uint64)(A) & (uint64)0x000000ff00000000ULL) >> 8)  | \
                     (((uint64)(A) & (uint64)0x00000000ff000000ULL) << 8)  | \
                     (((uint64)(A) & (uint64)0x0000000000ff0000ULL) << 24) | \
                     (((uint64)(A) & (uint64)0x000000000000ff00ULL) << 40) | \
                     (((uint64)(A) & (uint64)0x00000000000000ffULL) << 56))

  #define etohs  htoes
  #define etohl  htoel
  #define etohll htoell

#else

  #error "Must define one of EC_BIG_ENDIAN or EC_LITTLE_ENDIAN"

#endif

这里选择小端序（默认）。

nicdiv文件修改

这里只罗列了一部分

ecx_setupnic

/** Basic setup to connect NIC to socket.
 * @param[in] port        = port context struct
 * @param[in] ifname      = Name of NIC device, f.e. "eth0"
 * @param[in] secondary   = if >0 then use secondary stack instead of primary
 * @return >0 if succeeded
 */
int ecx_setupnic(ecx_portt *port, const char *ifname, int secondary) 
{
   int i;
   int rVal;
   int *psock;

//   port->getindex_mutex = mtx_create();
//   port->tx_mutex = mtx_create();
//   port->rx_mutex = mtx_create();

//   rVal = bfin_EMAC_init((uint8_t *)priMAC);
//   if (rVal != 0)
//      return 0;
      
   if (secondary)
   {
      /* secondary port stuct available? */
      if (port->redport)
      {
         /* when using secondary socket it is automatically a redundant setup */
         //psock = &(port->redport->sockhandle);
         *psock = -1;
         port->redstate                   = ECT_RED_DOUBLE;
         //port->redport->stack.sock        = &(port->redport->sockhandle);
         port->redport->stack.txbuf       = &(port->txbuf);
         port->redport->stack.txbuflength = &(port->txbuflength);
         port->redport->stack.tempbuf     = &(port->redport->tempinbuf);
         port->redport->stack.rxbuf       = &(port->redport->rxbuf);
         port->redport->stack.rxbufstat   = &(port->redport->rxbufstat);
         port->redport->stack.rxsa        = &(port->redport->rxsa);
         ecx_clear_rxbufstat(&(port->redport->rxbufstat[0]));
      }
      else
      {
         /* fail */
         return 0;
      }
   }
   else
   {
//      port->getindex_mutex = mtx_create();
//      port->tx_mutex = mtx_create();
//      port->rx_mutex = mtx_create();
      port->sockhandle        = -1;
      port->lastidx           = 0;
      port->redstate          = ECT_RED_NONE;
      //port->stack.sock        = &(port->sockhandle);
      port->stack.txbuf       = &(port->txbuf);
      port->stack.txbuflength = &(port->txbuflength);
      port->stack.tempbuf     = &(port->tempinbuf);
      port->stack.rxbuf       = &(port->rxbuf);
      port->stack.rxbufstat   = &(port->rxbufstat);
      port->stack.rxsa        = &(port->rxsa);
      ecx_clear_rxbufstat(&(port->rxbufstat[0]));
      psock = &(port->sockhandle);
   }  

   /* setup ethernet headers in tx buffers so we don't have to repeat it */
   for (i = 0; i < EC_MAXBUF; i++)
   {
      ec_setupheader(&(port->txbuf[i]));
      port->rxbufstat[i] = EC_BUF_EMPTY;
   }
   ec_setupheader(&(port->txbuf2));

   return 1;
}

ecx_outframe

/** Transmit buffer over socket (non blocking).
 * @param[in] port        = port context struct
 * @param[in] idx         = index in tx buffer array
 * @param[in] stacknumber  = 0=Primary 1=Secondary stack
 * @return socket send result
 */
int ecx_outframe(ecx_portt *port, int idx, int stacknumber)
{
   int lp, rval;
   ec_stackT *stack;

   if (!stacknumber)
   {
      stack = &(port->stack);
   }
   else
   {
      stack = &(port->redport->stack);
   }
   lp = (*stack->txbuflength)[idx];
   //rval = bfin_EMAC_send((*stack->txbuf)[idx], lp);
   rval = EthWrPacket((*stack->txbuf)[idx], lp);
   (*stack->rxbufstat)[idx] = EC_BUF_TX;

   return rval;
}

ecx_recvpkt

/** Non blocking read of socket. Put frame in temporary buffer.
 * @param[in] port        = port context struct
 * @param[in] stacknumber = 0=primary 1=secondary stack
 * @return >0 if frame is available and read
 */
static int ecx_recvpkt(ecx_portt *port, int stacknumber)
{
   int lp, bytesrx;
   ec_stackT *stack;

   if (!stacknumber)
   {
      stack = &(port->stack);
   }
   else
   {
      stack = &(port->redport->stack);
   }
   lp = sizeof(port->tempinbuf);
   //bytesrx = bfin_EMAC_recv((*stack->tempbuf), lp);
   bytesrx = EthRdPacket((*stack->tempbuf));
   port->tempinbufs = bytesrx;

   return (bytesrx > 0);
}