Odroid C2 + UPS3 power supply + 3.5 inch lcd shield

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phoax
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Odroid C2 + UPS3 power supply + 3.5 inch lcd shield

Unread post by phoax » Fri Aug 10, 2018 12:45 am

Hello,

Not easy to make the 3.5 inch lcd shield work with Ubuntu, fortunately this forum got informations to do it.

But when I plug the UPS3 power supply in addition to the lcd, I've got a white image.

Does anybody succeed in plugin the 3 elements together ?

Thanks,

joshua.yang
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ODROIDs: XU4, XU4Q + Cloudshell2
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Re: Odroid C2 + UPS3 power supply + 3.5 inch lcd shield

Unread post by joshua.yang » Mon Aug 13, 2018 2:28 pm

Hi @phoax,

I had tested that condition and it also shows only the white screen.

So I've been trying to figure out why, and the cause has to do with what pins both parts uses.

UPS3 uses 3 pins to inform its status.
- GPIO #225: POWER_LATCH
- GPIO #239: BAT_OK
- GPIO #247: AC_OK
And the 3.5 inch LCD shield uses a lot of pins than UPS3 uses. Among them, GPIO #247 is included for reset pin.
So the LCD won't work due to the pin shared with UPS3.

Please refer to the Wiki page.
UPS3 pin map: https://wiki.odroid.com/accessory/power ... nfigure_sw
3.5 inch LCD pin map: https://wiki.odroid.com/accessory/displ ... io_pin_map

For this reason, you also can't load the essential module(flexfb for generating a new frame buffer) for 3.5 inch LCD when you register a cron job for UPS3: https://wiki.odroid.com/accessory/power ... own_script

Thus, unfortunately, it is difficult to use the 3 parts together.

phoax
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Re: Odroid C2 + UPS3 power supply + 3.5 inch lcd shield

Unread post by phoax » Sun Aug 19, 2018 9:04 pm

Hello Joshua,

Thanks for you answer.

So sad they are not compatible :|

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