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Author Topic: enumeration issues if device is already powered by batteries  (Read 5818 times)

doctormano

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enumeration issues if device is already powered by batteries
« on: January 11, 2017, 03:23:26 pm »
Hello,

   I have a device that could be powered by batteries or USB. If no batteries are present, USB enumeration is 100% and device manager shows the virtual com port. However if unit is already powered by batteries, USB enumeration fails 50-70% of times. The unit is event driven so it isn't busy at all. When it fails device manager shows unknown device.
Attached a USB beagle to check the data flow and it lots of sync problems. Does anyone know why this maybe happening? See beagle output below.

Thanks in advance for your help.

# Level   Sp   Index   m:s.ms.us   Dur   Len   Err   Dev   Ep   Record   Summary
0      0   0:00.000.000                  Capture started (Aggregate)   [01/10/17 14:17:37]
0      1   0:00.000.023                  <Unreset> / <Target connected>   
0      2   0:00.003.019   1.999.989.250 s               [62648 SYNC ERRORS]   [Periodic Timeout]
0      3   0:02.003.030   1.397.959.666 s               [43782 SYNC ERRORS]   
0      4   0:03.401.030                  <Reset> / <Target disconnected>   
0      5   0:05.944.161                  <Unreset> / <Target connected>   
0      6   0:05.949.172   100.077.229 ms               [3289 SYNC ERRORS]   
0      7   0:06.049.288                  <Reset> / <Target disconnected>   
0      8   0:06.099.569                  <Unreset> / <Target connected>   
0      9   0:06.100.490   31.829.270 ms               [74 SYNC ERRORS]   
0      10   0:06.132.323   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      11   0:06.132.494   35.270 us               [12 SYNC ERRORS]   
0      12   0:06.132.533   61.875 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      13   0:06.132.610   31.645 us               [10 SYNC ERRORS]   
0      14   0:06.132.645   61.833 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      15   0:06.133.494   499.064.791 ms               [1000 SYNC ERRORS]   
0      16   0:06.633.260                  <Reset> / <Target disconnected>   
0      17   0:06.688.124                  <Unreset> / <Target connected>   
0      18   0:06.688.565   100.275.812 ms               [212 SYNC ERRORS]   
0      19   0:06.788.844   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      20   0:06.788.921   31.645 us               [10 SYNC ERRORS]   
0      21   0:06.788.956   61.833 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      22   0:06.789.035   31.645 us               [10 SYNC ERRORS]   
0      23   0:06.789.070   61.854 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      24   0:06.789.577   500.064.916 ms               [1002 SYNC ERRORS]   
0      25   0:07.289.831                  <Reset> / <Target disconnected>   
0      26   0:07.344.696                  <Unreset> / <Target connected>   
0      27   0:07.345.648   99.836.229 ms               [210 SYNC ERRORS]   
0      28   0:07.445.488   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      29   0:07.445.661   35.250 us               [12 SYNC ERRORS]   
0      30   0:07.445.700   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      31   0:07.445.776   31.645 us               [10 SYNC ERRORS]   
0      32   0:07.445.812   61.833 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      33   0:07.446.661   499.064.770 ms               [1000 SYNC ERRORS]   
0      34   0:07.946.380                  <Reset> / <Target disconnected>   
0      35   0:08.001.244                  <Unreset> / <Target connected>   
0      36   0:08.001.731   100.223.187 ms               [212 SYNC ERRORS]   
0      37   0:08.101.958   61.833 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      38   0:08.102.035   31.645 us               [10 SYNC ERRORS]   
0      39   0:08.102.070   61.854 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      40   0:08.102.147   31.645 us               [10 SYNC ERRORS]   
0      41   0:08.102.182   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      42   0:08.106.603   1.759.804.645 s               [55131 SYNC ERRORS]   
0      43   0:09.866.438                  <Reset> / <Target disconnected>   
0      44   0:23.947.729                  <Unreset> / <Target connected>   
0      45   0:23.951.834   95.091.687 ms               [1652 SYNC ERRORS]   
0      46   0:24.056.964                  <Reset> / <Target disconnected>   
0      47   0:24.103.316                  <Unreset> / <Target connected>   
0      48   0:24.103.774   32.294.145 ms               [76 SYNC ERRORS]   
0      49   0:24.136.072   61.979 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      50   0:24.136.149   31.645 us               [10 SYNC ERRORS]   
0      51   0:24.136.184   62.000 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      52   0:24.136.261   31.645 us               [10 SYNC ERRORS]   
0      53   0:24.136.297   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      54   0:24.136.778   500.064.895 ms               [1002 SYNC ERRORS]   
0      55   0:24.637.021                  <Reset> / <Target disconnected>   
0      56   0:24.691.885                  <Unreset> / <Target connected>   
0      57   0:24.692.849   99.887.395 ms               [210 SYNC ERRORS]   
0      58   0:24.792.740   61.979 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      59   0:24.792.862   35.250 us               [12 SYNC ERRORS]   
0      60   0:24.792.901   62.104 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      61   0:24.792.977   31.645 us               [10 SYNC ERRORS]   
0      62   0:24.793.013   61.916 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      63   0:24.793.862   499.064.770 ms               [1000 SYNC ERRORS]   
0      64   0:25.293.778                  <Reset> / <Target disconnected>   
0      65   0:25.348.642                  <Unreset> / <Target connected>   
0      66   0:25.348.932   100.477.250 ms               [212 SYNC ERRORS]   
0      67   0:25.449.413   62.083 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      68   0:25.449.490   31.645 us               [10 SYNC ERRORS]   
0      69   0:25.449.526   61.875 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      70   0:25.449.602   31.645 us               [10 SYNC ERRORS]   
0      71   0:25.449.638   61.979 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      72   0:25.449.945   500.064.895 ms               [1002 SYNC ERRORS]   
0      73   0:25.950.329                  <Reset> / <Target disconnected>   
0      74   0:26.005.193                  <Unreset> / <Target connected>   
0      75   0:26.006.016   100.525.770 ms               [212 SYNC ERRORS]   
0      76   0:26.106.545   62.083 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      77   0:26.106.622   31.645 us               [10 SYNC ERRORS]   
0      78   0:26.106.657   61.916 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      79   0:26.106.734   31.645 us               [10 SYNC ERRORS]   
0      80   0:26.106.770   61.895 us   9 B   C         CORRUPTED packet   06 00 01 00 00 40 00 DD 94
0      81   0:26.107.028   1.998.588.270 s               [62512 SYNC ERRORS]   [Periodic Timeout]
0      82   0:28.110.630   835.283.979 ms               [26293 SYNC ERRORS]   
0      83   0:28.945.942                  <Reset> / <Target disconnected>   
0      84   0:29.622.313                  <Unreset> / <Target connected>   
0      85   0:29.637.207   110.107.333 ms               [1888 SYNC ERRORS]   
0      86   0:29.757.352                  <Reset> / <Target disconnected>   
0      87   0:29.803.743                  <Unreset> / <Target connected>   
0      394   2:14.886.497                  <Reset> / <Target disconnected>   
0      395   2:18.153.563                  <Unreset> / <Target connected>   
0      396   2:18.253.981                  <Reset> / <Target disconnected>   
0      397   2:18.308.845                  <Unreset> / <Target connected>   
0      398   2:18.309.262   32.006.875 ms               [33 SOF]   [Frames: 454 - 486]
0      399   2:18.341.646   11.416 us   8 B   I   0   0   SETUP txn   80 06 00 01 00 00 40 00
0      402   2:18.341.661   11.416 us   8 B   I   0   0   SETUP txn   80 06 00 01 00 00 40 00
0      405   2:18.341.676   11.437 us   8 B   I   0   0   SETUP txn   80 06 00 01 00 00 40 00
0      408   2:18.342.267   500.066.250 ms               [501 SOF]   [Frames: 487 - 987]
0      409   2:18.842.515                  <Reset> / <Target disconnected>   
0      410   2:18.897.380                  <Unreset> / <Target connected>   
0      411   2:18.898.340   99.995.458 ms               [4702 SYNC ERRORS]   
0      412   2:18.998.365                  <Reset> / <Target disconnected>   
0      413   2:19.053.229                  <Unreset> / <Target connected>   
0      414   2:19.053.357   100.015.500 ms               [101 SOF]   [Frames: 1198 - 1298]
0      415   2:19.153.933   47.104 us   0 B      0   0   Set Address   Address=31
0      425   2:19.154.370   10.004.083 ms               [11 SOF]   [Frames: 1299 - 1309]
0      426   2:19.164.459   107.791 us   18 B      31   0   Get Device Descriptor   Index=0 Length=18
0      445   2:19.165.123   199.729 us   67 B      31   0   Get Configuration Descriptor   Index=0 Length=255
0      469   2:19.165.371   2.833 us               [1 SOF]   [Frame: 1310]
0      470   2:19.165.391   113.645 us   26 B      31   0   Get String Descriptor   Index=3 Length=255
0      489   2:19.165.570   99.854 us   4 B      31   0   Get String Descriptor   Index=0 Length=255
0      508   2:19.165.734   133.500 us   50 B      31   0   Get String Descriptor   Index=2 Length=255
0      527   2:19.165.932   50.666 us   0 B      31   0   Control Transfer (STALL)   Index=0 Length=10
0      536   2:19.166.371   13.004.479 ms               [14 SOF]   [Frames: 1311 - 1324]
0      537   2:19.179.376   76.375 us   18 B      31   0   Get Device Descriptor   Index=0 Length=18
0      551   2:19.179.491   107.083 us   9 B      31   0   Get Configuration Descriptor   Index=0 Length=9
0      570   2:19.179.639   191.437 us   67 B      31   0   Get Configuration Descriptor   Index=0 Length=67
0      594   2:19.179.937   198.104 us   67 B      31   0   Get Configuration Descriptor   Index=0 Length=265
0      618   2:19.180.251   62.854 us   0 B      31   0   Set Configuration   Configuration=1
0      628   2:19.180.373   1.002.958 ms               [2 SOF]   [Frames: 1325 - 1326]
0      629   2:19.181.305   127.229 us   7 B      31   0   Control Transfer   00 C2 01 00 00 00 08
0      647   2:19.181.475   53.583 us   0 B      31   0   Control Transfer   
0      657   2:19.181.752   108.708 us   7 B      31   0   Control Transfer   00 C2 01 00 00 00 08
0      676   2:19.181.919   108.562 us   7 B      31   0   Control Transfer   00 C2 01 00 00 00 08
0      695   2:19.182.373   588.077.395 ms               [589 SOF]   [Frames: 1327 - 1915]
0      696   2:19.770.813   81.104 us   7 B      31   0   Control Transfer   00 C2 01 00 00 00 08
0      710   2:19.771.448   2.812 us               [1 SOF]   [Frame: 1916]
0      711   2:19.771.458   76.312 us   7 B      31   0   Control Transfer   00 C2 01 00 00 00 08
0      725   2:19.772.448   9.004.041 ms               [10 SOF]   [Frames: 1917 - 1926]
0      726   2:19.782.208   53.958 us   0 B      31   0   Control Transfer   
0      736   2:19.770.759   4.415.354 ms         31   1   [150 IN-NAK]   [Periodic Timeout]
0      737   2:19.775.459   4.666 us         31   2   [1 IN-NAK]   [Periodic Timeout]
0      738   2:19.782.449   1.999.256.395 s               [2000 SOF]   [Frames: 1927 - 1878] [Periodic Timeout]
 
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Jan Axelson

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Re: enumeration issues if device is already powered by batteries
« Reply #1 on: January 11, 2017, 08:32:39 pm »
It looks like the device has a hard time recovering from a USB reset initiated by the host when the device has been powered for some time. I would start looking there in the device firmware.

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bpaddock

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Re: enumeration issues if device is already powered by batteries
« Reply #2 on: January 12, 2017, 07:57:02 am »
I would put an o'scope on the power line to the micro.
Looks like the impedance of the batteries/supply is to high causing the voltage to collapse at USB reset.
What is actually different from the hardware power perspective? Different regulators involved?


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doctormano

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Re: enumeration issues if device is already powered by batteries
« Reply #3 on: January 12, 2017, 02:12:41 pm »
Thanks for the response. There is only one regulator providing power to the micro. When USB is connected, it goes through a switching transistor to switch power from batteries to USB. Bypassing this and keeping the micro's input voltage at 3.3 volts doesn't make any difference in the enumeration frequency. Still fails when batteries are present. Monitored the voltage via scope and there is no dip in the voltage when USB cable is connected.
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doctormano

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Re: enumeration issues if device is already powered by batteries
« Reply #4 on: January 12, 2017, 02:16:08 pm »
Thanks for all inputs. Will look into the USB reset to see if there is anything that might explain this issue.
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Bret

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Re: enumeration issues if device is already powered by batteries
« Reply #5 on: January 13, 2017, 11:44:40 am »
This definitely seems like an issue related to power, though not necessarily voltage.  If it's feasible, you should try to measure both current and voltage, and do it at the input to the micro (after all of the switching transistors and regulators and filters and whatever have done their job).  It's even possible you're losing voltage or limiting current through the switching transistor when the batteries are there but not when USB power is there (depending on how the circuitry is designed).
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