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Xinyuan-LilyGO / LilyGo-EPD47

GNU General Public License v3.0
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Pullup resistors on the buttons makes them useless for deep sleep #60

Closed cgreening closed 3 years ago

cgreening commented 3 years ago

Just hit a major roadblock on a project.

The buttons have pull up resistors which makes them pretty much pointless for deep sleep mode.

esp_sleep_enable_ext1_wakeup has two modes, ESP_EXT1_WAKEUP_ANY_HIGH or ESP_EXT1_WAKEUP_ALL_LOW

You can only work out which pin woke the device using the ESP_EXT1_WAKEUP_ANY_HIGH - unfortunately this mode is not available as the pins are pulled high. So the device wakes up instantly.

I think the only alternative is to write some ULP assembly.

cgreening commented 3 years ago

I've got some ULP working for this - it's part of my e-Reader project but you should be able to take the relevant bits out. If there's interest I can turn this into a simple example.

https://github.com/atomic14/diy-esp32-epub-reader