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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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