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Two channel-swap bugs were stacked, hiding each other on symmetric
pixels (white text on black background) and showing up only on
saturated colour JPEGs:
1. jpeg_decoder: rgb_order was JPEG_DEC_RGB_ELEMENT_ORDER_RGB which
empirically emits the RGB565 word in big-endian byte order (the
IDF header comment "color component in big endian" is correct;
the enum's "RGB" name is misleading). Our painter reads native
LE uint16_t, so the bytes were always swapped. Flipped to
_BGR which emits LE — verified by dumping decoded bytes for
solid red/green/blue JPEGs.
2. display: rgb565_to_rgb888 wrote bytes [R, G, B], but the
ESP32-P4 DSI engine + TC358762 + Pi panel expect [B, G, R]
in memory despite the "RGB888" label. (MIPI DSI defines bit
order, not byte position in memory.) Verified with an
embedded solid-blue test JPEG: with [R, G, B] the panel
showed solid red; with [B, G, R] it shows solid blue.
Diagnosed by embedding a 480x800 blue test JPEG in firmware, decoding
+ dumping the buffer at boot, and reading the actual bytes over USB
serial (ethernet was disconnected mid-investigation). The temporary
self-test + debug dump are removed; the fixes themselves are tiny.
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Previously the 4-line "identity" screen showed only viewport name, mDNS
host, IP, and state. Expanded to 15 lines covering the full GET /config
+ GET /state output (name, host, ip, state, configured, scrypted,
orientation, brightness, idle, fw, uptime, frames, errs, free heap,
free PSRAM), label/value pairs left-aligned with auto-scaled font.
Renames "identity" → "info" throughout — symbol, log messages,
README/TESTING references.
Also:
- Move the info-screen render's big locals (~1.6 KiB: lines[16][80] +
scrypt[256] + vp_name[64]) to BSS. The touch task's 3 KiB stack
was overflowing on every long-press, leaving whatever frame was
previously on the panel — gave the appearance of a "blue screen"
after the M5 test pattern.
- Drop the ≥5 s touch factory-reset gesture and remove all stale
references to it in docs and comments. NVS wipe is now a USB-side
`idf.py erase-flash` operation only.
- M5 follow-up TODO in jpeg_decoder.c: solid green renders ~black and
solid blue renders green; not a byte-order issue (BGR setting turns
red into blue). Tracked as a known M5 gap.
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Holding the touch panel for 5 s to wipe NVS is dangerous (easy to
trigger by accident — phone resting on the panel, kids, etc.) and
useless as a recovery path (factory reset alone doesn't undo a bricked
config; a USB reflash does). Factory reset should be an explicit API
or USB-side action.
Touch gestures now: tap = toggle wake/sleep, ≥1.5 s hold = identity
overlay.
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POST /config has ~2.4 KiB of stack locals (2 KiB body buffer + the
scrypted URL + viewport name + cJSON parser frames) which overran the
default 4 KiB httpd task stack and tripped the stack-protect canary
mid-handler. The request body was applied to RAM + NVS, but the
handler crashed before sending the response, so curl saw a connection
reset and the device rebooted into "Stack protection fault".
M4 + M6 ✅ verified 2026-06-14 after the bump:
- POST /config full / partial → 204; survives reboot via NVS
- 5 validation failure modes → 400
- POST /state wake/sleep → 204; idempotent repeats → 204
- POST /frame while asleep → 409 with expected body
- idle timer fires after idle_timeout_ms; 0 correctly disables
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The Waveshare ESP32-P4-ETH board exposes BOOT on GPIO 35, but at runtime
that pin is owned by the EMAC TXD1 signal. No usable GPIO is wired to a
separate user button, so the BOOT-button task could never fire.
Move both BOOT-button behaviours onto the touch panel:
- ≥1.5s hold → 15s identity overlay (was BOOT short-press)
- ≥5s hold → factory reset (was BOOT long-hold)
Short tap (<500ms) still toggles wake/sleep. Long-press fires while the
finger is still down so the user gets immediate feedback at each
threshold.
Also strip the R/G/B 6 s boot test sequence — the panel now renders
correctly, so it's no longer useful diagnostically.
Boot subsystem flags drop the trailing B column: [EMHDJT].
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The Hosyond 5" panel uses Pi 7" v1.1 architecture (ATTINY ID 0xC3 +
TC358762 DSI-to-DPI bridge). Getting it to paint needed three things
that ESP-IDF doesn't expose:
1. TC358762 bridge configuration — 16 register writes via DSI Generic
Long Write (DT=0x29) packets, transcribed from Linux's tc358762.c.
2. Non-burst video mode — IDF hardcodes BURST_WITH_SYNC_PULSES, but
TC358762 requires NON_BURST_WITH_SYNC_PULSES. Overridden via the
mipi_dsi_host_ll_* API after esp_lcd_new_panel_dpi() and before
panel_init().
3. ATTINY v1.1 power-on sequence + SPI-proxy bridge wake. The legacy
REG_POWERON(0x85) path doesn't apply to 0xC3 firmware; instead
write PORTC/PORTA/PORTB/PORTC in order, then later release bridge
reset and proxy-write TC358762 SYSPMCTRL=0 through the ATTINY's
ADDR_H/L + WR_DATA_H/L registers.
Reaching the LL/HAL APIs requires shadowing esp_lcd_dsi_bus_t so we can
pick the mipi_dsi_hal_context_t out of the private struct. Documented
the layout dependency at the shadow definition.
Tuned config (observed stable on ESP32-P4 per embenix's reference):
- 1 data lane @ 600 Mbps
- DPI 26 MHz (Linux modeline is 25.98)
- timings HSW=2 HBP=46 HFP=210 / VSW=20 VBP=4 VFP=22
- RGB888 end-to-end, R,G,B byte order (BGR was wrong)
- disable_lp=0 so LP windows are available for the bridge writes
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DSI / panel:
- LDO_VO3 acquired at 2500 mV (VDD_MIPI_DPHY) — without this the PHY
PLL busy-waits forever inside esp_lcd_new_dsi_bus.
- PSRAM bumped to 200 MHz (CONFIG_IDF_EXPERIMENTAL_FEATURES) to keep
the DPI fed without underruns.
- Pi-7"-style 800x480 panel init (REG_POWERON, PORTA/PORTB/PWM/PORTC)
+ 16-bit RGB565 framebuffer with portrait-mode rotation buffer in
PSRAM. Currently shows garbled output — known issue, next commit
switches to the TC358762-bridge-aware init sequence.
State + UX:
- viewport_state simplified to AWAKE/ASLEEP only; "unconfigured" is
a flag, not a state. Tap always toggles; content choice (identity
vs frame) is driven by the configured flag.
- BOOT button arms a 15 s identity overlay via local_screens_overlay;
expired callback returns to prior state.
- Boot-done indicator: two backlight flashes (no usable LED GPIO on
the Waveshare board — GPIO 35 BOOT is shared with EMAC TXD1).
- Best-effort subsystem init in app_main; display init deferred to
its own task so a panel hang can't block networking.
Display test pattern: solid R/G/B for 2 s each on boot to characterize
the garble independent of text rendering.
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First flash to real hardware (Waveshare ESP32-P4-ETH on USB power,
no LAN cable, no panel attached) exposed three bugs and the need to
degrade gracefully when peripherals are missing.
1. net_eth.c: RXD0 / RXD1 GPIO swap. ESP32-P4's EMAC iomux table
(components/soc/esp32p4/emac_periph.c) fixes RXD0 to GPIO 29 and
RXD1 to GPIO 30. The Waveshare-wiki/ESPHome research had them
transposed. Symptom was:
E (esp.emac.gpio): invalid RXD0 GPIO number
E (esp.emac): esp_eth_mac_new_esp32 failed
-> ESP_ERROR_CHECK abort
Fix: swap the two #defines. CRS_DV / TXD0 / TXD1 / TX_EN / REF_CLK
pinout was already correct.
2. mdns_service.c: mdns_service_add() rejects with INVALID_ARG when
the hostname isn't set yet (see mdns_responder.c:771 — first guard
in mdns_service_add_for_host). We were setting hostname AFTER
service_add inside apply_records(). Restructure mdns_service_start
to: init -> hostname -> service_add -> txt. apply_hostname() and
apply_txt() helpers reuse the same snapshot under viewport_state's
mutex; mdns_service_refresh() re-applies both.
3. app_main.c: every subsystem now best-effort instead of
ESP_ERROR_CHECK abort. A single missing peripheral can't take down
the rest of the firmware. End-of-boot summary line:
boot complete — subsystems [EMHdJ-B] ip=(no link)
Uppercase letter = up, lowercase = down. E=Ethernet M=mDNS H=HTTP
D=Display J=JPEG T=Touch B=BootButton. Touch shows '-' when display
didn't come up (it shares the panel I2C bus). On a stripped board
(just ESP32-P4-ETH on USB, no panel, no LAN) the line above prints
and the device serves /state, /config, and mDNS over the loopback;
plugging Ethernet in later picks up DHCP without a reboot.
Side-effects: the DHCP timeout in app_main shortened from 30s to 15s
so a no-cable boot finishes quickly. Reaching the "ready" state with
no link is fine — the driver keeps the link-up event handler armed and
gets the IP whenever a cable appears.
Verified on hardware (bare ESP32-P4-ETH, no LAN, no panel):
- ESP-IDF v5.4.1, esp32p4, 32 MB PSRAM detected, 16 MB flash config
(actual 32 MB silkscreen — keeping 16 MB until access-beyond-16MB
support lands in flash driver).
- Ethernet driver started — MAC e8:f6:0a:e0:90:94.
- mDNS up advertising viewport.local on _scrypted-viewport._tcp:80.
- HTTP up listening :80.
- JPEG decoder ready.
- Display reports "panel MCU @0x45 unreachable" — exactly correct
for no-panel state.
- Touch skipped as designed.
- BOOT button registered on GPIO 0 (still a guess; harmless if wrong).
This is enough to flip M1's "code" status to ✅ on hardware once
Ethernet is plugged in. M2 (mDNS browse + GET /state) ready to verify.
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local_screens_show_ip() now renders four lines instead of two —
all the device's runtime identity at once:
line 1: viewport name ("mudroom" / "viewport" if unconfigured)
line 2: mDNS hostname ("viewport-mudroom.local" / "viewport.local")
line 3: IP ("192.168.1.42" / "no network")
line 4: state ("awake" / "asleep" / "unconfigured")
Same screen is shown on first boot, after factory reset, and as a
15s BOOT short-press overlay — operator always has the device's full
identity one button-press away (find it on the LAN, confirm name +
configuration without curling).
Font scale is auto-picked: the largest integer scale (1×–6×) where
the longest line fits within 90% of width AND all four lines plus
inter-line spacing fit within 90% of height. Works for both portrait
(480×800) and landscape (800×480) without separate code paths.
Font expanded to cover the new strings:
- All lowercase a–z (added b, f, h, j, k, m, q, s, u, x, y, z).
- Punctuation: dash, slash (digits, period, colon already covered).
Fallback policy unchanged: unsupported chars render as blank, which
keeps the table tight and the failure mode visible rather than
crashing.
README "Local rendering" + TESTING.md M8 updated to describe the
four-line identity layout and show both the unconfigured-boot and
configured-overlay example outputs.
Build verified clean against ESP-IDF 5.4 (binary ~873 KB, +1.6 KB
for the expanded font).
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local_screens.{h,c}:
- Embedded 8x8 bitmap font sized to a 95-char table; only the glyphs
used by today's strings (viewport.local, the IPv4 string, Loading...)
are populated. Unsupported chars render blank.
- 768 KB PSRAM scratch FB at panel-native dims.
- local_screens_show_ip() — two centered lines:
"viewport.local"
<current IP>
Scale 3x portrait / 4x landscape; centered vertically.
- local_screens_show_loading() — centered "Loading..." at scale 4x/5x.
- local_screens_restore_for_state() — repaint after BOOT-overlay expiry:
UNCONFIGURED -> IP screen; AWAKE/ASLEEP -> black FB (next /frame or
sleep handles the rest).
- All paths go through display_present_rgb565() so orientation rotation
is automatic.
button.{h,c}:
- Polling task at 30ms, active-low with internal pull-up.
- Short press (<5s, released) → backlight on, IP overlay for 15s via
esp_timer one-shot, then restore.
- Hold ≥ 5s → nvs_config_reset() + esp_restart().
- PIN_BOOT_BUTTON = GPIO 0 is a TODO placeholder. ESP32-P4 strap pin
GPIO35 is owned by RMII TXD1 at runtime so Waveshare must expose a
separate user button on a free pin; confirm against the schematic.
Fail-soft if mis-wired: input reads stuck-high and the task never
fires.
state_machine on AWAKE transition now calls local_screens_show_loading()
right after display_wake() — so every wake (tap or POST /state) flashes
a clear "Loading..." until the next /frame paints over it.
app_main on boot:
- Calls local_screens_init() after display_init().
- UNCONFIGURED → paint IP screen (replaces the M3 test pattern).
- ASLEEP → backlight off (unchanged).
- After all subsystems: button_init().
Build clean against ESP-IDF 5.4 (binary ~870 KB; the font/glyph data is
under 800 bytes).
TESTING.md M8 documents the visual checks, the BOOT-pin placeholder
caveat, the AWAKE-overlay-overwrite behavior, the open follow-up about
post-overlay backlight when ASLEEP, and the font fallback policy.
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state_client.{h,c}:
- Worker task drains a depth-1 queue (xQueueOverwrite gives the
replace-on-full semantics from the spec — in-flight POST is never
cancelled; the next queued entry is overwritten by newer state).
- esp_http_client POST to <scrypted>/state with Content-Type application/
json, User-Agent ScryptedViewport/<version>, Connection: close, 1s
timeout. Body: {"viewport":"<name>","state":"wake"|"sleep"}.
- Any non-2xx or transport error increments state_post_failures and is
otherwise ignored. Silently drops if no Scrypted URL is configured.
touch.{h,c}:
- FT5426 capacitive touch on the shared I2C bus at 0x38.
- 30ms polling task; tracks down/up transitions, detects taps as
down-then-up within 500ms with a 150ms debounce.
- On tap, toggles wake/sleep via state_machine_set_local(), which drives
the local transition AND fires state_client_post() at Scrypted.
state_machine adds state_machine_set_local(): runs the same transition
as state_machine_set() then enqueues an outbound POST. Idle-timer
expiry now uses this path so Scrypted sees idle-driven sleeps too
(the spec's "tighten the race with /frame 409" path stays in place as
the fallback).
display.h exposes display_i2c_bus(); touch.c uses it instead of
re-initializing the same I2C port.
app_main starts state_client right after the state machine and starts
touch after display init (touch is skipped if display isn't up since
they share the bus).
CMakeLists.txt: add esp_http_client to REQUIRES.
Build clean against ESP-IDF 5.4 (binary ~860 KB; jumped ~210 KB from
M6 because esp_http_client + cJSON path pulls in tcp_transport, mbedtls,
http_parser).
TESTING.md M7: flask-based test receiver, tap dispatch verification,
failure-path check (kill receiver, confirm counter increments),
queue-coalescing behavior, no-POST-on-Scrypted-initiated, no-POST-
when-unconfigured.
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state_machine.{h,c} — central wake/sleep transitions:
- state_machine_init() creates the esp_timer one-shot for the idle timer.
- state_machine_set(target) is idempotent and atomic. On AWAKE: backlight
on, idle timer (re)armed. On ASLEEP: idle timer cancelled, backlight off.
Rejects with INVALID_STATE when the device is unconfigured.
- state_machine_frame_painted() restarts the idle timer if awake; called
by /frame after each successful paint.
- Idle-timer callback transitions to ASLEEP. TODO M7 hook: outbound POST
{viewport, state:sleep} to <scrypted>/state.
http_api.c:
- POST /state: parse {state}, accept "wake"/"sleep", reject others 400.
Unconfigured device → 409 "device unconfigured". Already-in-state → 204
(idempotent no-op). Successful transition → 204.
- POST /frame: 409 Conflict when state != AWAKE. After successful paint,
call state_machine_frame_painted() so the idle clock keeps resetting
while frames stream.
app_main:
- Initialize state_machine before http_api so the route handler can drive
it from request 0.
- After display_init(), reconcile the panel with the boot state:
UNCONFIGURED → test pattern (placeholder until M8 IP screen)
ASLEEP → display_sleep() so a configured device boots dark
AWAKE → leave on (not reached on fresh boot)
Disable path: idle_timeout_ms=0 in /config means the timer is never armed
and a wake state persists until /state {sleep} or a power cycle.
Build clean against ESP-IDF 5.4 (binary ~645 KB).
TESTING.md M6 expands with idempotency checks, 409-when-asleep, 409-when-
unconfigured, idle-timer firing within idle_timeout_ms+slack, /frame
restarting the idle timer, idle-timer disable via idle_timeout_ms=0, and
the M7 dependency note about the missing outbound sleep POST.
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jpeg_decoder.{h,c} wraps esp_driver_jpeg (ESP32-P4 hardware decoder).
- One-time engine + DMA-aligned PSRAM scratch buffer setup (1 MB input,
768 KB output @ panel native 800x480 RGB565).
- try_lock + unlock so concurrent /frame POSTs get 503 instead of
queueing, per spec.
- jpeg_decoder_get_info() reports the dimensions; the http handler
validates them against the effective resolution before painting.
display.h adds display_present_rgb565(src, w, h):
- Landscape: src is 800x480, memcpy 1:1 into the panel framebuffer.
- Portrait: src is 480x800, software rotate 90° CW into the 800x480
panel framebuffer. (PPA / 2D-DMA hardware rotation is a later
optimization if portrait latency matters.)
http_api.c adds POST /frame:
- Content-Type must be image/jpeg → else 400.
- Empty body → 400. > 1 MB → 413. Display not initialized → 500.
- jpeg_decoder_try_lock(0) for concurrency: second post returns 503.
- Body streamed into the decoder's input buffer in chunks.
- Decode failure or dimension mismatch → 400 + decode_errors++.
- Paint failure → 500.
- Success → frames_received++, last_frame_us = esp_timer_get_time(),
204 No Content.
app_main initializes the JPEG decoder after display_init(). Both are
best-effort: failures log a warning and leave the rest of the firmware
running.
CMakeLists.txt: add esp_driver_jpeg to REQUIRES.
Known gap (M6 closes it): /frame currently paints regardless of
wake/sleep state. The 409-when-asleep rule lands with POST /state
in M6.
Build clean against ESP-IDF 5.4 (binary ~640 KB).
TESTING.md M5 expanded with portrait/landscape test commands,
ImageMagick test-image recipes, the full negative matrix (wrong
Content-Type, oversize, wrong dims, concurrent, garbage), and the
M6 dependency note.
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nvs_config.{h,c} — persist the runtime config (viewport, scrypted,
idle_timeout_ms, orientation, brightness) under a single NVS namespace.
nvs_config_load() applies persisted values over the in-RAM defaults on
boot and flips state from UNCONFIGURED to ASLEEP once both name and
Scrypted URL are present. nvs_config_save() commits the whole record
atomically.
http_api.c — add GET /config and POST /config:
- GET serializes viewport_state to the spec's JSON shape, with null
for unset string fields and defaults filled in for the rest.
- POST is partial: each field is optional; only present fields are
validated and applied. Validation runs on a staged copy and errors
short-circuit with 400 + reason before any state mutation, so a
rejected request leaves the device untouched.
- Validation rules: viewport non-empty <64 chars; scrypted starts with
http:// and <256 chars; idle_timeout_ms 0 or >=5000; orientation in
{portrait,landscape}; brightness 0..100.
- Side-effects fire after the lock + save: brightness change pushes
PWM to the panel MCU; viewport/orientation change reapplies mDNS
hostname + TXT.
- 204 on success; 400 with a single-line reason on validation error.
app_main calls nvs_config_load() right after viewport_state_init(), so
mdns_service_start() and display_init() see the persisted hostname,
orientation, and brightness from the first packet/PWM.
Build clean against ESP-IDF 5.4 (binary ~620 KB).
TESTING.md M3 now documents the Hosyond jumper wiring (5V/GND/SDA=GPIO7/
SCL=GPIO8 from board to panel header; DSI FPC carries only the high-
speed lanes). M4 entry expands the validation matrix and side-effects
to verify.
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display.{h,c} brings up the Hosyond 5\" 800x480 panel via the Raspberry
Pi 7\" touchscreen architecture:
- I2C init to the panel-side MCU at 0x45 (Pi 7\" register map ported
from drivers/gpu/drm/panel/panel-raspberrypi-touchscreen.c).
- POWERON write + 120ms settle.
- ESP32-P4 MIPI-DSI bring-up in DPI video mode: 2-lane, 480 Mbps,
800x480 @ 60Hz, RGB565, canonical Pi 7\" timings (HSW=18/HBP=20/HFP=62,
VSW=4/VBP=27/VFP=18, 30 MHz pixel clock).
- Gamma-corrected (^2.2) PWM brightness via REG_PWM (0x86).
- display_sleep / display_wake hooks for M6.
- display_fill() and display_test_pattern() (8 vertical color bars)
for M3 acceptance and reuse by M8 local screens.
app_main calls display_init() as best-effort — if the panel isn't
attached or wiring is wrong, the rest of the firmware (Ethernet, mDNS,
/state) keeps running. On success it paints the test pattern.
Pin assignments (PIN_I2C_SDA=7, PIN_I2C_SCL=8) match Waveshare's
bundled-panel BSP convention but are flagged TODO until the user's
specific FPC adapter wiring is confirmed.
main/CMakeLists.txt: add driver, esp_driver_i2c, esp_lcd to REQUIRES.
Build verified clean against ESP-IDF 5.4 for target esp32p4. M3
acceptance (color bars on screen) cannot be verified without a
flashed board + connected panel.
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- viewport_state.{h,c}: shared state struct (config, run-state, counters,
orientation, timestamps) behind a FreeRTOS mutex. Modules update it
under viewport_state_lock(); GET /state serializes a snapshot.
- http_api.{h,c}: starts esp_http_server on :80, registers GET /state.
Returns the full JSON shape from the spec (name, version, configured,
state, uptime_ms, last_frame_ms_ago, frames_received, decode_errors,
state_post_failures, resolution, ip, free_heap, free_psram).
- mdns_service.{h,c}: mdns_init + advertise _scrypted-viewport._tcp.local
on :80 with version/resolution/orientation/name TXT records.
mdns_service_refresh() reapplies hostname + TXT after /config writes
(called from M4 onward).
- main/CMakeLists.txt: add esp_http_server, esp_timer, json, mdns to
REQUIRES. espressif/mdns added as managed component via
main/idf_component.yml.
app_main calls viewport_state_init early so any module can read defaults
before /config arrives.
Also adds TESTING.md tracking per-milestone verification status and an
integration test plan to run after M9 (races, failure modes, longevity,
power cycles, negative protocol, multi-viewport).
M1 promoted to "🟡 builds clean" in TESTING.md; combined HW verification
of M1+M2 will be one flash session. Build verified against ESP-IDF 5.4
for target esp32p4 (binary ~550 KB).
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net_eth module brings up the Waveshare ESP32-P4-ETH-POE Ethernet
interface (internal EMAC + IP101GRI PHY) and waits for a DHCP lease.
Pin map confirmed via Waveshare wiki + ESPHome's working config:
MDC=31, MDIO=52, REF_CLK=50 (CLK_EXT_IN from PHY)
TX_EN=49, TXD0=34, TXD1=35
CRS_DV=28, RXD0=30, RXD1=29
PHY reset/enable=51, PHY addr=1
app_main initializes NVS, netif, the default event loop, then starts
the Ethernet driver and waits up to 30s for an IP. On success it logs
the IP; on timeout it logs a warning and proceeds (the driver keeps
retrying in the background).
sdkconfig: declare 16 MB flash so partitions.csv (6.1 MB) fits.
main/CMakeLists.txt: explicit REQUIRES esp_eth esp_event esp_netif
nvs_flash.
Acceptance (per M1 in the impl guide): device gets a DHCP lease over
Ethernet and prints its IP. Build is clean against ESP-IDF 5.4 for
target esp32p4.
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Plain ESP-IDF project targeting Waveshare ESP32-P4-ETH-POE with a 5" 800x480
MIPI-DSI capacitive touch panel. Stub app_main with TODOs for Ethernet, mDNS,
HTTP API (/health, /config, /frame, /sleep, /brightness), JPEG decode, and
touch callback delivery per the v1 spec in README.md.
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