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- display: s_last_pwm cached the raw 0-100 percentage at init but
display_wake writes it straight to REG_PWM (0-255 duty) — first wake
ran visibly dim until a /config brightness change. Shared pct_to_duty
helper now converts in both paths.
- http_api: cap consecutive OTA recv timeouts (a stalled client spun
forever holding s_ota_in_progress, wedging OTA until reboot); cap
viewport name at 54 chars so viewport-<name> fits the 63-byte mDNS
label; log mdns_service_refresh failures; /state builds JSON from a
snapshot instead of holding the state lock across ~25 cJSON allocs;
respond_400 delegates to respond_status.
- stream_server: bytes_in_window now counts painted frames only (frames
discarded while asleep inflated the first post-wake window's MB/s,
avg-jpeg and chunk/wire averages; recv_bytes folded in); so_rcvbuf
carried into the stats snapshot under the mux; drop dead HEADER_BYTES;
merge read_body_instrumented into read_n.
- state_machine: transition mutex serializes concurrent wake/sleep
(display side-effects ran after the state lock dropped, so racing
callers could leave the backlight contradicting st->state); wake-path
placeholder paint now takes the decoder lock like the stream path
(concurrent esp_lcd_panel_draw_bitmap from two tasks isn't safe).
- local_screens: overlay paint takes the decoder lock too; check the
overlay timer create; panel dims from viewport_state.h.
- jpeg_decoder: try_lock before init returns busy instead of passing a
NULL semaphore to xSemaphoreTake.
- net_eth: clear cached IP string on link down (stale /state + info).
- dead code: display_present_bgr888, TOUCH_FT5426_ADDR, touch s_task,
JPEG_DECODER_MAX_OUTPUT_BYTES; doc drift in nvs_config.h /
jpeg_decoder.h / app_main flag legend.
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Code-review pass after the M5 colour fix. -126 net lines (-215 / +89).
Dead code removed:
- display_fill, display_test_pattern — M3 bring-up self-tests, no callers
- net_eth_is_up — no callers
- nvs_config_reset — no callers (factory-reset gesture was removed earlier;
NVS wipe now goes through `idf.py erase-flash`)
Helpers inlined or collapsed (each had one call site):
- state_name / orientation_name — ternaries at the cJSON site
- fmt_bytes / fmt_uptime — inline scope in local_screens_show_info
- expected_dims (http_api) + effective_dims (local_screens) — merged into
viewport_state_effective_dims() in viewport_state, one canonical source
state_machine cleanup:
- arm_idle_timer_unlocked / disarm_idle_timer collapsed to one arm_idle_timer(ms)
that takes the snapshotted timeout (ms==0 disables). Removes the misleading
name and the second viewport_state lock acquisition per painted frame.
- state_machine_set + state_machine_frame_painted now snapshot state + idle_ms
under one lock.
mdns_service cleanup:
- snapshot_state / apply_hostname / apply_txt collapsed into a single
apply_state(include_hostname) helper; mdns_service_start grabs hostname
once for hostname_set + log instead of going under the lock three times.
http_api cleanup:
- POST /config brightness-changed path uses the local `bright` it already
validated instead of re-locking + re-reading st->brightness.
- Trimmed verbose bring-up comments (stack-size justification, M5 saga,
DSI shadow struct) to one line each — kept the load-bearing facts.
Smoke-tested on hardware: boot clean, display + JPEG + touch all up
([DJT]), info screen renders, no crashes.
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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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