ESP32-P4 Function EV Board Example

This example demonstrates the espp::Esp32P4FunctionEvBoard BSP for the Espressif ESP32-P4 Function EV Board + ESP32-P4-HMI-Subboard.

image

It:

  • initializes the MIPI-DSI display (EK79007 or ILI9881C, per Kconfig) and the GT911 touch controller,

  • draws an LVGL UI that lets you draw circles wherever you touch and plays a click sound on each touch (press the BOOT button to clear the drawing),

  • shows a live on-screen status read-out: display panel, touch coordinates, SD card size, Ethernet IP, RTPS publisher status, and system info (free internal/PSRAM heap and uptime),

  • mounts the microSD card (if inserted),

  • initializes the ES8311 audio codec (and loads an embedded click.wav),

  • brings up Ethernet (IP101) with DHCP and, once it has an IP, starts an RTPS participant that publishes a counter on espp/test/counter, and

  • wires the BOOT button.

[!IMPORTANT] The LCD adapter board’s RST_LCD and PWM signals must be jumpered to the ESP32-P4 main board (RST_LCD → J1 GPIO27, PWM → J1 GPIO26) or the screen stays black. See the component README.

Configuration

Use idf.py menuconfig → ESP32-P4 Function EV Board Configuration to select the display panel (EK79007 1024x600 by default, or ILI9881C 800x1280), adjust task stack sizes, and enable Ethernet.

By default touch is polled. If you wire the GT911 touch INT pin (from the LCD expansion header) to a free GPIO, enable Use interrupt-driven touch instead of polling and set Touch interrupt GPIO to read touch from an interrupt instead. The example needs no code change — initialize_touch() follows the Kconfig setting.

Build and Flash

idf.py set-target esp32p4
idf.py build flash monitor

Notes

  • PSRAM is required (enabled in sdkconfig.defaults) for the MIPI-DSI frame buffers.

  • Plug an Ethernet cable to see the DHCP-assigned IP appear on screen and in the log.

Example Output

I (1352) main_task: Calling app_main()
[ESP32-P4 Function EV Board Example/I][1.355]: Starting example!
[ESP32-P4 Function EV Board Example/I][1.363]: Display panel: EK79007
[ESP32-P4 Function EV Board Example/I][1.388]: Found 2 I2C device(s)
[Esp32P4FunctionEvBoard/I][1.388]: Initializing LCD (MIPI-DSI)
[Esp32P4FunctionEvBoard/I][1.390]: Performing LCD hardware reset on GPIO27
[Esp32P4FunctionEvBoard/I][1.529]: Creating MIPI DSI bus (2 lanes, 900 Mbps/lane)
[Esp32P4FunctionEvBoard/I][1.530]: Installing MIPI DSI DBI panel IO
[Esp32P4FunctionEvBoard/I][1.532]: Using display panel: EK79007 (1024x600)
[Esp32P4FunctionEvBoard/I][1.540]: Creating DPI panel (1024x600 @ 52 MHz)
[Esp32P4FunctionEvBoard/I][1.675]: LCD initialization completed (EK79007)
[Esp32P4FunctionEvBoard/I][1.675]: Initializing LVGL display with pixel buffer size: 51200 pixels
[Display/W][1.680]: No rotation callback provided, resolution changed event will not automatically update the display hardware rotation.
[Esp32P4FunctionEvBoard/I][1.695]: LVGL display initialized
[Esp32P4FunctionEvBoard/I][1.703]: Initializing GT911 multi-touch controller
[Esp32P4FunctionEvBoard/I][1.707]: Using GT911 at address 0x5D
[Esp32P4FunctionEvBoard/I][1.713]: Touch in interrupt mode (GT911 INT on GPIO33)
[Esp32P4FunctionEvBoard/I][1.721]: Touch controller initialized
[Esp32P4FunctionEvBoard/I][1.762]: Initializing SD card (4-bit SDMMC)
E (1790) sdmmc_common: sdmmc_init_ocr: send_op_cond (1) returned 0x107
HINT: Please reboot the board and then try again
E (1790) vfs_fat_sdmmc: sdmmc_card_init failed (0x107).
HINT: Please verify if there is an SD card inserted into the SD slot. Then, try rebooting the board.
E (1791) vfs_fat_sdmmc: esp_vfs_fat_sdmmc_sdcard_init failed (0x107).
[Esp32P4FunctionEvBoard/W][1.797]: Failed to initialize the card (ESP_ERR_TIMEOUT). Make sure an SD card is inserted.
[ESP32-P4 Function EV Board Example/W][1.808]: No SD card mounted
[Esp32P4FunctionEvBoard/I][1.819]: Initializing audio (ES8311) at 44100 Hz
W (1822) i2s_common: dma frame num is adjusted to 256 to align the dma buffer with 64, bufsize = 512
I (1833) DRV8311: ES8311 in Slave mode
[ESP32-P4 Function EV Board Example/I][1.843]: Loaded 35875 bytes of click audio @ 44100 Hz
[Esp32P4FunctionEvBoard/I][1.843]: Initializing Ethernet (EMAC + IP101 EMAC)
[Esp32P4FunctionEvBoard/I][1.850]: Creating ESP32 EMAC
[Esp32P4FunctionEvBoard/I][1.857]: Creating generic PHY (IP101)
[Esp32P4FunctionEvBoard/I][1.862]: Installing Ethernet driver
I (2410) esp_eth.netif.netif_glue: 60:55:f9:f9:49:a1
I (2410) esp_eth.netif.netif_glue: ethernet attached to netif
[Esp32P4FunctionEvBoard/I][4.610]: Ethernet started
[Esp32P4FunctionEvBoard/I][4.610]: Ethernet initialized; waiting for link/DHCP
[Esp32P4FunctionEvBoard/I][4.612]: Ethernet link up: 100 Mbps, full duplex
[Esp32P4FunctionEvBoard/E][4.619]: BOOT button shares GPIO35 with Ethernet RMII TXD1; refusing to initialize it while Ethernet is up (it would kill Ethernet TX).
[ESP32-P4 Function EV Board Example/I][4.637]: BOOT button not initialized (shared with Ethernet RMII TXD1 pin)
I (6758) esp_netif_handlers: eth ip: 192.168.1.31, mask: 255.255.255.0, gw: 192.168.1.1
[Esp32P4FunctionEvBoard/I][6.758]: Ethernet got IP: 192.168.1.31
[ESP32-P4 Function EV Board Example/I][6.761]: Ethernet IP: 192.168.1.31
[ESP32-P4 Function EV Board Example/I][6.770]: Got IP 192.168.1.31, starting RTPS participant
[ESP32-P4 Function EV Board Example/I][10.905]: === Connectivity self-test (ping) ===
[ESP32-P4 Function EV Board Example/I][10.905]: Pinging gateway (192.168.1.1)...
[ESP32-P4 Function EV Board Example/I][10.912]:   gateway: seq=1207959553 ttl=1341597504 time=0ms (64 bytes)
[ESP32-P4 Function EV Board Example/I][11.411]:   gateway: seq=1207959554 ttl=1341597504 time=0ms (64 bytes)
[ESP32-P4 Function EV Board Example/I][11.910]:   gateway: seq=1207959555 ttl=1341597504 time=0ms (64 bytes)
[ESP32-P4 Function EV Board Example/I][12.410]:   gateway: seq=1207959556 ttl=1341597504 time=0ms (64 bytes)
[ESP32-P4 Function EV Board Example/I][12.910]: Ping gateway (192.168.1.1): 4/4 received, 0% loss, avg 0 ms
[ESP32-P4 Function EV Board Example/W][12.910]: Ping self-test: no RTPS peer discovered yet to ping
[ESP32-P4 Function EV Board Example/I][12.918]: === Connectivity self-test done ===
image

https://github.com/user-attachments/assets/b6fe4516-af14-455f-9c21-8f5d4323dd56