ft245使用过程中偶尔不稳定
我用FT245BM做USB转串口,驱动装的是虚拟串口那个,确定使用的USB连接线使用比较好的线缆,直接插到PC机主板上未用连接线也没使用前面板连接线。使用过程中发现偶尔USB会不正常,请问以下到底是怎么回事?特别是“no response”或“canceled”表示出了什么问题?数据如下:Bus Hound 3.02 capture. Complements of www.perisoft.net
Dev - Device ID
Time- Elapsed time since the start of the previous Phase
Phase - ADDR= 1394 transfer addressLOCK= 1394 lock transaction
CDB = Command block NSTS= NT status
CTL = USB control packet RSET= bus reset
DI= Data In RSTS= I/O Request Status
DO= Data Out SNS = SCSI Sense Data
IDE = IDE task file commandSSTS= SCSI Request Block Status
ISOC= Isochronous Transfer USTS= USB status
(13) USB <-> Serial
DevPhaseData Info Time Cmd.Phase.Ofs
---------------------------------------------------------------------
13CTL 40 00 00 00 - 00 00 00 00VENDOR 0us 1.1.0
13CTL 40 00 00 00 - 00 00 00 00VENDOR 2.8ms 2.1.0
13CTL 40 00 00 00 - 00 00 00 00VENDOR 2.9ms 3.1.0
13CTL 40 00 00 00 - 00 00 00 00VENDOR 2.9ms 4.1.0
13CTL 40 00 00 00 - 00 00 00 00VENDOR 2.9ms 5.1.0
13CTL 40 00 00 00 - 00 00 00 00VENDOR 3.0ms 6.1.0
13CTL 40 09 10 00 - 00 00 00 00VENDOR 3.0ms 7.1.0
13DI 31 60 1` 4.9ms 8.1.0
13CTL c0 05 00 00 - 00 00 02 00VENDOR 69us 9.1.0
13DI 31 60 1` 3.9ms 9.2.0
13CTL 40 04 08 00 - 00 00 00 00VENDOR 149us 10.1.0
13CTL 40 01 01 01 - 00 00 00 00VENDOR 2.9ms 11.1.0
13DI 31 60 1` 2.9ms 12.1.0
13CTL 40 01 02 02 - 00 00 00 00VENDOR 165us 13.1.0
13CTL 40 02 00 00 - 00 00 00 00VENDOR 2.8ms 14.1.0
13DI 31 60 1` 13ms 15.1.0
13CTL 40 03 1a 00 - 00 00 00 00VENDOR 856us 16.1.0
13CTL 40 03 1a 00 - 00 00 00 00VENDOR 3.3ms 17.1.0
13CTL 40 01 02 02 - 00 00 00 00VENDOR 2.8ms 18.1.0
13CTL 40 01 01 01 - 00 00 00 00VENDOR 3.0ms 19.1.0
13CTL 40 04 08 00 - 00 00 00 00VENDOR 2.9ms 20.1.0
13DI 31 60 1` 2.9ms 21.1.0
13DI 31 60 1` 15ms 22.1.0
13DI 31 60 1` 15ms 23.1.0
13DI 31 60 1` 16ms 24.1.0
13DI 31 60 1` 15ms 25.1.0
。。。。。。。。
13DI 31 60 1` 15ms 227.1.0
13USTS 05 00 00 c0 no response 11ms 228.1.0
13USTS 00 00 01 c0 canceled 1.7sc 20.2.0
13CTL 40 02 00 00 - 00 00 00 00VENDOR 107us 229.1.0
13DI 31 60 1` 7.9ms 230.1.0
13CTL 40 06 00 00 - 00 00 00 00VENDOR 864us 231.1.0
13DI 31 60 1` 14ms 232.1.0
。。。。。。。。。
13DI 31 60 1` 16ms 410.1.0
13USTS 05 00 00 c0 no response 3.9ms 411.1.0
13DI 31 60 1` 12ms 412.1.0
。。。。。。。。。。
13DI 31 60 1` 15ms 432.1.0
13USTS 05 00 00 c0 no response 8.9ms 433.1.0
13DI 31 60 1` 23ms 434.1.0 各位可否告知怎样减小USB出错的几率? freny 发表于 2008-1-11 08:53 static/image/common/back.gif
各位可否告知怎样减小USB出错的几率?
为什么有时候上电,单片机跟电脑通信不上?
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