gd407使用dm9000通讯异常

如题，gd407使用dm9000，当通讯一段时间后网络掉线，无法连接，程序未跑死，必须重启或者重新配置dm9000才能重新连接。经过排查之后，在dm9000的发送函数添加一小段延时解决

rt_err_t rt_dm9000_tx( rt_device_t dev, struct pbuf *p)
{
	uint64 tx_timestamp	=	0;
  int tx_status = 0;
  DM9000_TRACE("dm9000 tx: %d\n", p->tot_len);

  /* lock DM9000 device */
  rt_sem_take(&sem_lock, RT_WAITING_FOREVER);

  /* disable dm9000a interrupt */
  dm9000_io_write(DM9000_IMR, IMR_PAR);

  /* Move data to DM9000 TX RAM */
  DM9000_outb(DM9000_IO_BASE, DM9000_MWCMD);

  {
      /* q traverses through linked list of pbuf's
       * This list MUST consist of a single packet ONLY */
      struct pbuf *q;
      rt_uint16_t pbuf_index = 0;
      rt_uint8_t word[2], word_index = 0;

      q = p;
      /* Write data into dm9000a, two bytes at a time
       * Handling pbuf's with odd number of bytes correctly
       * No attempt to optimize for speed has been made */
      while (q)
      {
          if (pbuf_index < q->len)
          {
              word[word_index++] = ((u8_t *)q->payload)[pbuf_index++];
              if (word_index == 2)
              {
                  DM9000_outw(DM9000_DATA_BASE, (word[1] << 8) | word[0]);
                  word_index = 0;
                  dm9000_delay(5); //添加小段延时，约2us
              }
          }
          else
          {
              q = q->next;
              pbuf_index = 0;
          }
      }
      /* One byte could still be unsent */
      if (word_index == 1)
      {
          DM9000_outw(DM9000_DATA_BASE, word[0]);
      }
  }

  if (dm9000_device.packet_cnt == 0)
  {
      DM9000_TRACE("dm9000 tx: first packet\n");

      dm9000_device.packet_cnt ++;
      /* Set TX length to DM9000 */
      dm9000_io_write(DM9000_TXPLL, p->tot_len & 0xff);
      dm9000_io_write(DM9000_TXPLH, (p->tot_len >> 8) & 0xff);

      /* Issue TX polling command */
      dm9000_io_write(DM9000_TCR, TCR_TXREQ);	/* Cleared after TX complete */
  }
  else
  {
      DM9000_TRACE("dm9000 tx: second packet\n");

      dm9000_device.packet_cnt ++;
      dm9000_device.queue_packet_len = p->tot_len;
  }

  /* enable dm9000a interrupt */
  dm9000_io_write(DM9000_IMR, dm9000_device.imr_all);

  /* unlock DM9000 device */
  rt_sem_release(&sem_lock);


	tx_timestamp	=	sys_timer_Getstamp();
  
   /* transmit done */
  while(1)
  {
    //rt_thread_delay(1);
    dm9000_delay(5); //添加小段延时，约2us
    tx_status = dm9000_io_read(DM9000_NSR);    /* Got TX status */

    if (tx_status & (NSR_TX2END | NSR_TX1END))
    {
        txcount++;
        dm9000_device.packet_cnt --;
        if (dm9000_device.packet_cnt > 0)
        {
            DM9000_TRACE("dm9000 isr: tx second packet\n");

            /* transmit packet II */
            /* Set TX length to DM9000 */
            dm9000_io_write(DM9000_TXPLL, dm9000_device.queue_packet_len & 0xff);
            dm9000_io_write(DM9000_TXPLH, (dm9000_device.queue_packet_len >> 8) & 0xff);

            /* Issue TX polling command */
            dm9000_io_write(DM9000_TCR, TCR_TXREQ);	/* Cleared after TX complete */
        }
        break;
    }
    else 
    {
      txrecount++;
      if(sys_timer_getstamp_between(tx_timestamp) >=	20000)
      {
        dm9000_device.packet_txtimecout++;
        dm9000_device.packet_cnt --;
        if (dm9000_device.packet_cnt > 0)
        {
            DM9000_TRACE("dm9000 isr: tx second packet\n");
            
            /* transmit packet II */
            /* Set TX length to DM9000 */
            dm9000_io_write(DM9000_TXPLL, dm9000_device.queue_packet_len & 0xff);
            dm9000_io_write(DM9000_TXPLH, (dm9000_device.queue_packet_len >> 8) & 0xff);

            /* Issue TX polling command */
            dm9000_io_write(DM9000_TCR, TCR_TXREQ);	/* Cleared after TX complete */
        }
        break;
      }
    }
  }
  DM9000_TRACE("dm9000 tx done\n");

    return RT_EOK;
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133