Re: [ECOS] What functions should I call in ethernet drv ?

["ariga masahiro" <ariga@link-lab.co.jp>]

Hello Gary and others,

> Gray wrote:
> You should not have to change the driver.  The differences in
> endian-ness are handled by the macros CYG_CPU_TO_LE16() and
> CYG_LE16_TO_CPU().  Make sure that your HAL defines them
> correctly.

The received data are reserved into data buffer in lan91cxx_recv's
line 1230 - line 1235
lan91cxx_recv()
      1230:         if (data) {
      1231:             while( clen > 0 ) {
      1232:                 *data++ = get_data_byte(sc);
      1233:                 clen--;
      1234:             }
      1235:         }

-->
cyg_uint8 get_data_byte(struct eth_drv_sc *sc)
{
    cyg_uint8 c;
    struct lan91cxx_priv_data *cpd =
        (struct lan91cxx_priv_data *)sc->driver_private;

    if( cpd->data_pos == sizeof(rxd_t) )
    {
        cpd->data_buf = get_data(sc);
        cpd->data_pos = 0;
    }

    c = (cpd->data_buf>>(cpd->data_pos*8))&0xFF;
    cpd->data_pos++;

    return c;

}

-->
get_data(struct eth_drv_sc *sc)
{
    rxd_t val;
    struct lan91cxx_priv_data *cpd =
        (struct lan91cxx_priv_data *)sc->driver_private;

#ifdef LAN91CXX_32BIT_RX
    HAL_READ_UINT32(cpd->base+((LAN91CXX_DATA_HIGH & 0x7) << cpd->addrsh), 
val);
#else
     HAL_READ_UINT16(cpd->base+((LAN91CXX_DATA & 0x7) << cpd->addrsh), val);
 #endif

 #if DEBUG & 2
     diag_printf("read data 0x%x\n", val);
 #endif
     return val;
 }

-->
#define HAL_READ_UINT16( _register_, _value_ )                  \
    CYG_MACRO_START                                             \
    ((_value_) = *((volatile CYG_WORD16 *)(_register_)));       \
    CYG_MACRO_END

As you can see CYG_CPU_TO_LE16() and CYG_LE16_TO_CPU() are never used,
and it is impossible to reserve data in BigEndian form without change.

Maybe at the time of interpriting ARP-request, reading data exchangedly ?
I tried to find where ARP-request is parsed and interpreted,but couldn't 
find where it is.

I checked that ISR,DSR are called(although I'm not sure they are called 
right time)
so I suppose that if ARP-request is correctly interpreted and ARP-reply is 
made and sent out,
it will work.

I sincerely ask your favor.
Would you please let me know next few questions ?
1.I would like to know where ARP-request is parsed and interpreted,
  entry function name, and if possible line numbers.

2.After ARP-request is recognised, by what sequence lan91cxx_send is called.

3.Where ARP-reply packet is made ?
  entry function name, and if possible line numbers.

I look forward to your reply.
Thank you in advance.

Masahiro Ariga



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