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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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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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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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