Beaglebone black wireless and wl18xx ...

Philippe Frossard

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Sep 1, 2020, 5:18:10 AM9/1/20

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Hi,
I'm using Beaglebone black wireless with Debian 9.13 and kernel
4.19.135-bone54,
The wl1835 doesn't work on LiPo battery when DC 5v is disconnected,
I read about diode D2 on the board ...
I would like to know if this diode is the solution ?
Thanks.

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Philippe Frossard

Alexander Zangerl

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Sep 1, 2020, 5:18:26 PM9/1/20

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On Tue, 01 Sep 2020 11:17:47 +0200, Philippe Frossard writes:
>The wl1835 doesn't work on LiPo battery when DC 5v is disconnected,
>I read about diode D2 on the board ...
>I would like to know if this diode is the solution ?

it is, at least according to the bbbw schematic
at https://github.com/beagleboard/beaglebone-black-wireless/blob/master/BeagleBone_Black_Wireless_SCH.pdf
(top left corner of the 'wifi module' section).

for unknown reasons the bbbw designers have marked it 'dnp' (do not populate)
on the schematic.

regards
az

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Philippe Frossard

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Sep 2, 2020, 3:22:52 AM9/2/20

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Hi,
Yes, I saw ...
D2 is not present on the board, I will do the test with D2 ...
The BBBW doesn't shutdown correctly without wifi, some process block ...
I have also a problem with ADC power,
The ADC power (P9.32) doesn't fall to 0v and I use this signal (With
BBB) to disconnect my LiPo ...
I try to find another way,
Thanks.

Le 01/09/2020 à 23:18, Alexander Zangerl a écrit :
> On Tue, 01 Sep 2020 11:17:47 +0200, Philippe Frossard writes:
>> The wl1835 doesn't work on LiPo battery when DC 5v is disconnected,
>> I read about diode D2 on the board ...
>> I would like to know if this diode is the solution ?
> it is, at least according to the bbbw schematic
> at https://github.com/beagleboard/beaglebone-black-wireless/blob/master/BeagleBone_Black_Wireless_SCH.pdf
> (top left corner of the 'wifi module' section).
>
> for unknown reasons the bbbw designers have marked it 'dnp' (do not populate)
> on the schematic.
>
> regards
> az
>
>

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Philippe Frossard

Philippe Frossard

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Sep 4, 2020, 9:05:30 AM9/4/20

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Hi,
With diode D2 the shutdown process works,
And wifi is available on battery ...
A+

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