为什么枚举过程没有设备描述符的获取？

只看该作者 · 2014-3-13 16:24

用BUS HOUND监视虚拟串口的枚举过程，先打开BUS HOUND监视功能再插入USB虚拟串口,俘获到下列信息，为什么没有设备描述符、配置描述符等的获取过程？
--------------------------------
Device  Phase  Data                                              Description    Cmd.Phase.Ofs(rep)
------  -----  --------------------------------------------------  ----------------  ------------------
  25.0  CTL 00 01 01 00  00 00 00 00                         CLEAR FEATURE          1.1.0
  25.1  IN    08 00                                              ..                      2.1.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             3.1.0(2)
  25.0  IN    01 01 01 00                                        ....                   3.2.0
  25.0  CTL 23 01 10 00  03 00 00 00                         CLEAR FEATURE          5.1.0
  25.0  CTL a3 00 00 00  01 00 04 00                         GET STATUS             6.1.0
  25.0  IN    00 01 00 00                                        ....                   6.2.0
  25.0  CTL a3 00 00 00  02 00 04 00                         GET STATUS             7.1.0
  25.0  IN    00 01 00 00                                        ....                   7.2.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             8.1.0(2)
  25.0  IN    01 01 00 00                                        ....                   8.2.0
  25.0  CTL 23 03 04 00  03 00 00 00                         SET FEATURE          10.1.0
  25.1  IN    08 00                                              ..                   11.1.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             12.1.0
  25.0  IN    03 01 10 00                                        ....                   12.2.0
  25.0  CTL 23 01 14 00  03 00 00 00                         CLEAR FEATURE          13.1.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             14.1.0(3)
  25.0  IN    03 01 00 00                                        ....                   14.2.0
  25.0  CTL 23 03 04 00  03 00 00 00                         SET FEATURE          17.1.0
  25.1  IN    08 00                                              ..                   18.1.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             19.1.0
  25.0  IN    03 01 10 00                                        ....                   19.2.0
  25.0  CTL 23 01 14 00  03 00 00 00                         CLEAR FEATURE          20.1.0
  25.0  CTL a3 00 00 00  03 00 04 00                         GET STATUS             21.1.0
  25.0  IN    03 01 00 00                                        ....                   21.2.0
  25.0  CTL a3 00 00 00  04 00 04 00                         GET STATUS             22.1.0
  25.0  IN    00 01 00 00                                        ....                   22.2.0
  25.0  CTL a3 00 00 00  05 00 04 00                         GET STATUS             23.1.0
  25.0  IN    00 01 00 00                                        ....                   23.2.0
  25.0  CTL a3 00 00 00  06 00 04 00                         GET STATUS             24.1.0
  25.0  IN    00 01 00 00                                        ....                   24.2.0
  25.0  CTL a3 00 00 00  07 00 04 00                         GET STATUS             25.1.0
  25.0  IN    00 01 00 00                                        ....                   25.2.0
  25.0  CTL a3 00 00 00  08 00 04 00                         GET STATUS             26.1.0
  25.0  IN    00 01 00 00                                        ....                   26.2.0
  26.0  CTL 80 06 00 03  00 00 ff 00                         GET DESCRIPTOR       27.1.0(2)
  26.0  IN    04 03 09 04                                        ....                   27.2.0
  26.0  CTL 80 06 02 03  09 04 ff 00                         GET DESCRIPTOR       28.1.0(2)
  26.0  IN    20 03 55 00  53 00 42 00  20 00 56 00  69 00 72 00 .U.S.B. .V.i.r.       28.2.0
            74 00 75 00  61 00 6c 00  20 00 43 00  4f 00 4d 00  t.u.a.l. .C.O.M.       28.2.16
  25.0  CTL 80 00 00 00  00 00 02 00                         GET STATUS             31.1.0(3)
  25.0  IN    01 00                                              ..                   31.2.0

只看该作者 · 2014-3-14 09:05

本帖最后由与时俱进于 2014-3-14 15:27 编辑

获取描述符只有两处：语言ID 和字符串描述符，没有设备描述符和配置描述符的获取，为什么？
-------------
  26.0  CTL 80 06 00 03  00 00 ff 00                         GET DESCRIPTOR       27.1.0(2)
  26.0  IN    04 03 09 04                                        ....                   27.2.0
  26.0  CTL 80 06 02 03  09 04 ff 00                         GET DESCRIPTOR       28.1.0(2)
  26.0  IN    20 03 55 00  53 00 42 00  20 00 56 00  69 00 72 00 .U.S.B. .V.i.r.       28.2.0
            74 00 75 00  61 00 6c 00  20 00 43 00  4f 00 4d 00  t.u.a.l. .C.O.M.       28.2.16

只看该作者 · 2014-3-15 12:08

同样东西插到另一台电脑上，BUS HOUND检测出来的枚举信息就很正常。

只看该作者 · 2014-3-15 12:47

打开和关闭虚拟串口的USB活动信息：
Device  Phase  Data                                              Description    Cmd.Phase.Ofs(rep)
------  -----  --------------------------------------------------  ----------------  ------------------
//关闭串口
  28.0  CTL 21 22 00 00  00 00 00 00                         SET CTRL LINE ST    458.1.0
  28.0  USTS c0000004                                           stall pid             458.2.0
//打开串口
  28.0  CTL a1 21 00 00  00 00 07 00                         GET LINE CODING       459.1.0(2)
  28.0  USTS c0000004                                           stall pid             459.2.0
  28.0  CTL 21 20 00 00  00 00 07 00                         SET LINE CODING       461.1.0
  28.0  OUT 00 c2 01 00  00 00 08                            .......             461.2.0
  28.0  CTL a1 21 00 00  00 00 07 00                         GET LINE CODING       462.1.0
  28.0  USTS c0000004                                           stall pid             462.2.0
  28.0  CTL 21 22 01 00  00 00 00 00                         SET CTRL LINE ST    463.1.0
  28.0  USTS c0000004                                           stall pid             463.2.0

为什么枚举过程没有设备描述符的获取？

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