tfaour
461beed04f
ESP-IDF locks ("holds") every pin armed as a GPIO deep-sleep wakeup
source across the sleep transition, and never releases it automatically
on wake -- confirmed against sleep_modes.c's
esp_sleep_gpio_wakeup_prepare_on_hp_periph_powerdown(), which calls
gpio_hold_en() with no corresponding gpio_hold_dis() anywhere in
ESP-IDF's own wake path. Left held, live gpio_get_level() reads stay
frozen at whatever level the pin had when sleep began (almost always
"not pressed"), which is indistinguishable from a real "not pressed"
reading and silently broke any live poll for a *new* press later in the
same awake session.
This never surfaced before the manage menu's escalation feature, since
every other button check either used the latched wakeup-status register
(unaffected by hold) or only polled once, early in boot, before any
sleep/wake cycle in that session. wait_for_button_press() is the first
code in this project to repeatedly poll a button live *after* having
just woken via that same pin -- exactly the case hold breaks. Fixed by
calling gpio_hold_dis() before gpio_config() in all three buttons' init
functions, not just manage's -- reset and next-photo have the same
latent issue in their own live-read fallback paths, just not yet
exercised the same way.
ESPresso Frame
A DIY e-ink photo frame: an ESP32-C6 pulls photos from your Immich library and displays them on a 7.3" full-color e-paper panel, waking on a timer to refresh and spending the rest of its time in deep sleep.
- No cables to a computer, no SD card shuffling. Provisioning is a captive portal with a QR code drawn on the panel itself -- scan, join, fill in your WiFi and server address, done.
- The frame never decodes an image. A small self-hosted server does all the work (pulling from Immich, cropping, dithering, packing into the panel's exact pixel format) and hands the device a stream it can write straight to SPI. The ESP32-C6 has no PSRAM and not much SRAM to spare -- keeping it a dumb display client is what makes that workable.
- Crops toward faces, not just the center, using face bounding boxes Immich already computed for its own People feature -- no bundled face detector.
- Refresh interval and album are configurable from a web UI, no reflashing needed to change them.
Hardware
- ESP32-C6 dev board (8MB flash)
- Waveshare 7.3" E Ink Spectra 6 (E6) panel -- 800x480, 6-color, SPI
See docs/hardware.md for wiring and
docs/architecture.md for how the two halves talk
to each other.
Getting started
server/-- run the FastAPI server first (Docker Compose, points at your Immich instance). Seeserver/README.md.firmware/-- build and flash the ESP32-C6, then scan the QR codes it draws on first boot to provision it. Seefirmware/README.md.
Repo layout
firmware/ ESP-IDF project for the ESP32-C6
server/ FastAPI server: Immich -> crop/dither/pack -> the frame
docs/ Wiring and architecture notes
License
MIT -- see LICENSE. A few small pieces of vendored
third-party code (a QR code generator, a bitmap font table) keep their
own permissive licenses; see LICENSE for details.
Built with substantial assistance from Claude Code.