espressif/esp32_p4_function_ev_board

# BSP: ESP32-P4 Function EV Board | [HW Reference](https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32p4/esp32-p4-function-ev-board/user_guide.html) | [HOW TO USE API](#api-reference) | [EXAMPLES](#compatible-bsp-examples) | [![Component Registry](https://components.espressif.com/components/espressif/esp32_p4_function_ev_board/badge.svg)](https://components.espressif.com/components/espressif/esp32_p4_function_ev_board) | ![maintenance-status](https://img.shields.io/badge/maintenance-actively--developed-brightgreen.svg) | | --- | --- | --- | --- | -- | ## Overview <table> <tr><td> ESP32-P4-Function-EV-Board is a multimedia development board based on the ESP32-P4 chip. ESP32-P4 chip features a dual-core 400 MHz RISC-V processor and supports up to 32 MB PSRAM. In addition, ESP32-P4 supports USB 2.0 specification, MIPI-CSI/DSI, H264 Encoder, and various other peripherals. With all of its outstanding features, the board is an ideal choice for developing low-cost, high-performance, low-power network-connected audio and video products. </td><td width="200"> <img src="doc/esp32_p4_function_ev_board.webp"> </td></tr> </table> ![](doc/esp32-p4-function-ev-board-annotated-photo-front.png) ## HW Version | HW version | BSP Version | | :--------: | :---------: | | V1.0 | ^1 | | V1.2 | ^2 | | [V1.4](https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32p4/esp32-p4-function-ev-board/user_guide.html) | ^3 | ## Configuration Configuration in `menuconfig`. Selection LCD display `Board Support Package(ESP32-P4) --> Display --> Select LCD type` - LCD 1280x800 - ili9881c (default) - LCD 1024x600 - ek79007 - HDMI - lt8912b - 800x600@60HZ - 1280x720@60HZ - 1280x800@60HZ - 1920x1080@30HZ Selection color format `Board Support Package(ESP32-P4) --> Display --> Select LCD color format` - RGB565 (default) - RGB888 ## HDMI Support This BSP supports HDMI converter Lontium LT8912B. Follow these rules for using it with HDMI: - Use ESP-IDF 5.4 or older (from commit [93fdbf2](https://github.com/espressif/esp-idf/commit/93fdbf25b3ea7e44d1f519ed61050847dcc8a076)) - Only RGB888 is supported with HDMI - Use MIPI-DSI to HDMI converter Lontium LT8912B ## Capabilities and dependencies <div align="center">  | Available | Capability | Controller/Codec | Component | Version | |------------------|------------------------|--------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------| |:heavy_check_mark:| :pager: DISPLAY |ek79007, ili9881c, lt8912b|[espressif/esp_lcd_ek79007](https://components.espressif.com/components/espressif/esp_lcd_ek79007) [espressif/esp_lcd_ili9881c](https://components.espressif.com/components/espressif/esp_lcd_ili9881c) [espressif/esp_lcd_lt8912b](https://components.espressif.com/components/espressif/esp_lcd_lt8912b) idf|1.* 1.* >=0.1.1,<1.0.0 >=5.3| |:heavy_check_mark:|:black_circle: LVGL_PORT| | [espressif/esp_lvgl_port](https://components.espressif.com/components/espressif/esp_lvgl_port) | ^2 | |:heavy_check_mark:| :point_up: TOUCH | gt911 | [espressif/esp_lcd_touch_gt911](https://components.espressif.com/components/espressif/esp_lcd_touch_gt911) | ^1 | | :x: | :radio_button: BUTTONS | | | | |:heavy_check_mark:| :musical_note: AUDIO | | [espressif/esp_codec_dev](https://components.espressif.com/components/espressif/esp_codec_dev) | 1.2.* | |:heavy_check_mark:| :speaker: AUDIO_SPEAKER| es8311 | | | |:heavy_check_mark:| :microphone: AUDIO_MIC | es8311 | | | |:heavy_check_mark:| :floppy_disk: SDCARD | | idf | >=5.3 | | :x: | :video_game: IMU | | | |  </div> ## Compatible BSP Examples <div align="center">  | Example | Description | Try with ESP Launchpad | | ------- | ----------- | ---------------------- | | [Display Example](https://github.com/espressif/esp-bsp/tree/master/examples/display) | Show an image on the screen with a simple startup animation (LVGL) | [Flash Example](https://espressif.github.io/esp-launchpad/?flashConfigURL=https://espressif.github.io/esp-bsp/config.toml&app=display) | | [LVGL Benchmark Example](https://github.com/espressif/esp-bsp/tree/master/examples/display_lvgl_benchmark) | Run LVGL benchmark tests | - | | [LVGL Demos Example](https://github.com/espressif/esp-bsp/tree/master/examples/display_lvgl_demos) | Run the LVGL demo player - all LVGL examples are included (LVGL) | [Flash Example](https://espressif.github.io/esp-launchpad/?flashConfigURL=https://espressif.github.io/esp-bsp/config.toml&app=display_lvgl_demo) | | [Display Rotation Example](https://github.com/espressif/esp-bsp/tree/master/examples/display_rotation) | Rotate screen using buttons or an accelerometer (`BSP_CAPS_IMU`, if available) | [Flash Example](https://espressif.github.io/esp-launchpad/?flashConfigURL=https://espressif.github.io/esp-bsp/config.toml&app=display_rotation) | | [USB HID Example](https://github.com/espressif/esp-bsp/tree/master/examples/display_usb_hid) | USB HID demo (keyboard, mouse, or gamepad visualization using LVGL) | - |  </div>  ## LVGL Benchmark **DATE:** 08.07.2025 10:31 **LVGL version:** 9.3.0 | Name | Avg. CPU | Avg. FPS | Avg. time | render time | flush time | | ---- | :------: | :------: | :-------: | :---------: | :--------: | | Empty screen | 55% | 88 | 6 | 5 | 1 | | Moving wallpaper | 89% | 71 | 10 | 7 | 3 | | Single rectangle | 23% | 88 | 1 | 1 | 0 | | Multiple rectangles | 39% | 90 | 2 | 2 | 0 | | Multiple RGB images | 30% | 98 | 1 | 1 | 0 | | Multiple ARGB images | 56% | 91 | 6 | 6 | 0 | | Rotated ARGB images | 88% | 58 | 14 | 14 | 0 | | Multiple labels | 92% | 61 | 12 | 12 | 0 | | Screen sized text | 99% | 13 | 69 | 67 | 2 | | Multiple arcs | 98% | 47 | 17 | 15 | 2 | | Containers | 30% | 89 | 3 | 3 | 0 | | Containers with overlay | 95% | 28 | 31 | 29 | 2 | | Containers with opa | 31% | 92 | 4 | 4 | 0 | | Containers with opa_layer | 65% | 75 | 12 | 12 | 0 | | Containers with scrolling | 99% | 28 | 32 | 30 | 2 | | Widgets demo | 99% | 17 | 51 | 49 | 2 | | All scenes avg. | 68% | 64 | 16 | 16 | 0 |

# API Reference <div align="center"> | :1234: [CAPABILITIES](#1234-capabilities) | :floppy_disk: [SD CARD AND SPIFFS](#floppy_disk-sd-card-and-spiffs) | :musical_note: [AUDIO](#musical_note-audio) | :pager: [DISPLAY AND TOUCH](#pager-display-and-touch) | :electric_plug: [USB](#electric_plug-usb) | | :-------------------------: | :-------------------------: | :-------------------------: | :-------------------------: | :-------------------------: | </div> ## Overview This document provides an overview of the ESP-BSP (Board Support Package) API as implemented by this board. While the ESP-BSP framework defines a unified API shared across multiple boards, this documentation focuses only on the APIs supported by the current board. Any APIs not applicable to this board's hardware are excluded or may not be functional. The goal of this document is to make it easier for developers to understand the available APIs and how to use them consistently across different boards. ## General ### Pinout Each BSP defines a set of macros for default pin assignments used by its hardware peripherals. These macros allow users to configure or reference standard interfaces like I2C, SPI, LCD, audio, or SD cards easily. - I2C: `BSP_I2C_*` - Display: `BSP_LCD_*` - Audio I2S: `BSP_I2S_*` - USB: `BSP_USB_*` - SD Card (MMC): `BSP_SD_*` - SD Card (SPI): `BSP_SD_SPI_*` > [!NOTE] > Not all boards support all interfaces. You should always check if the related capability macro (e.g., BSP_CAPS_SDCARD) is defined. ### I2C Some devices included in BSPs (e.g., sensors, displays, audio codecs) communicate via the I2C interface. In many cases, I2C is initialized automatically as part of the device setup. However, you can manually initialize or deinitialize the I2C peripheral using the following API: ``` /* Initialize the default I2C bus used by the BSP */ bsp_i2c_init(); ... /* Deinitialize the I2C bus */ bsp_i2c_deinit(); ``` If you need direct access to the initialized I2C bus (e.g., to communicate with an external peripheral not handled by the BSP), you can retrieve the I2C bus handle: ``` i2c_master_bus_handle_t i2c = bsp_i2c_get_handle(); ``` > [!NOTE] > The BSP ensures that I2C initialization is performed only once, even if called multiple times. This helps avoid conflicts when multiple components rely on the same I2C bus. ### ADC Some devices included in BSPs (such as buttons, battery monitoring, etc.) use the ADC peripheral. In most cases, the ADC is automatically initialized as part of the specific device setup. However, you can manually initialize the ADC using the following API: ``` /* Initialize the ADC peripheral */ bsp_adc_initialize(); ``` If you need direct access to the ADC instance (e.g., for custom measurements), you can retrieve the handle: ``` adc_oneshot_unit_handle_t adc = bsp_adc_get_handle(); ``` > [!NOTE] > The BSP ensures the ADC is initialized only once, even if `bsp_adc_initialize()` is called multiple times. ### Features Some boards support enabling or disabling specific hardware features (such as LCD, SD card, camera, etc.) to reduce power consumption or manage shared resources. The BSP provides a unified API to control these features: ``` /* Enable the LCD feature */ bsp_feature_enable(BSP_FEATURE_LCD, true); /* Disable the speaker to reduce power usage */ bsp_feature_enable(BSP_FEATURE_SPEAKER, false); ``` Supported feature flags (may vary depending on the board): - `BSP_FEATURE_LCD` - Display module - `BSP_FEATURE_TOUCH` - Touch controller - `BSP_FEATURE_SD` - SD card interface - `BSP_FEATURE_SPEAKER`- Audio speaker - `BSP_FEATURE_BATTERY` - Battery monitoring - `BSP_FEATURE_VIBRATION` - Vibration motor > [!NOTE] > Not all BSPs support feature toggling, and some features may not be available or controllable via this API. Always check the BSP header or documentation for supported features. > [!TIP] > Disabling unused features can help reduce power consumption, especially in battery-powered applications. ## Identification Each BSP defines an identifier macro in the form of `BSP_BOARD_*`. ### Board Name API Reference ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_BOARD\_ESP32\_P4\_FUNCTION\_EV\_BOARD**](#define-bsp_board_esp32_p4_function_ev_board) | ## :1234: Capabilities Each BSP defines a set of capability macros that indicate which features are supported. The list may look like this. You can use these macros to conditionally compile code depending on feature availability. ### Capabilities API Reference ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_CAPS\_AUDIO**](#define-bsp_caps_audio) 1 | | define | [**BSP\_CAPS\_AUDIO\_MIC**](#define-bsp_caps_audio_mic) 1 | | define | [**BSP\_CAPS\_AUDIO\_SPEAKER**](#define-bsp_caps_audio_speaker) 1 | | define | [**BSP\_CAPS\_BUTTONS**](#define-bsp_caps_buttons) 0 | | define | [**BSP\_CAPS\_DISPLAY**](#define-bsp_caps_display) 1 | | define | [**BSP\_CAPS\_IMU**](#define-bsp_caps_imu) 0 | | define | [**BSP\_CAPS\_SDCARD**](#define-bsp_caps_sdcard) 1 | | define | [**BSP\_CAPS\_TOUCH**](#define-bsp_caps_touch) 1 | ### I2C API Reference ## Functions | Type | Name | | ---: | :--- | | esp\_err\_t | [**bsp\_i2c\_deinit**](#function-bsp_i2c_deinit) (void) _Deinit I2C driver and free its resources._ | | i2c\_master\_bus\_handle\_t | [**bsp\_i2c\_get\_handle**](#function-bsp_i2c_get_handle) (void) _Get I2C driver handle._ | | esp\_err\_t | [**bsp\_i2c\_init**](#function-bsp_i2c_init) (void) _Init I2C driver._ | ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_I2C\_NUM**](#define-bsp_i2c_num) CONFIG\_BSP\_I2C\_NUM | | define | [**BSP\_I2C\_SCL**](#define-bsp_i2c_scl) (GPIO\_NUM\_8) | | define | [**BSP\_I2C\_SDA**](#define-bsp_i2c_sda) (GPIO\_NUM\_7) | ## Functions Documentation ### function `bsp_i2c_deinit` _Deinit I2C driver and free its resources._ ```c esp_err_t bsp_i2c_deinit ( void ) ``` **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG I2C parameter error ### function `bsp_i2c_get_handle` _Get I2C driver handle._ ```c i2c_master_bus_handle_t bsp_i2c_get_handle ( void ) ``` **Returns:** * I2C handle ### function `bsp_i2c_init` _Init I2C driver._ ```c esp_err_t bsp_i2c_init ( void ) ``` **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG I2C parameter error * ESP\_FAIL I2C driver installation error ## :floppy_disk: SD Card and SPIFFS ### SPIFFS Initialization / Deinitialization Each BSP provides a simple API for mounting and unmounting the SPI Flash File System (SPIFFS). ``` /* Mount SPIFFS to the virtual file system */ bsp_spiffs_mount(); /* ... perform file operations ... */ /* Unmount SPIFFS from the virtual file system */ bsp_spiffs_unmount(); ``` ### SD Card Initialization / Deinitialization The BSP offers a flexible API for working with SD cards. In addition to the default mount and unmount functions, you can also use a configuration structure or access preconfigured `host` and `slot` structures. Mount with Default Configuration ``` /* Mount microSD card to the virtual file system */ bsp_sdcard_mount(); /* ... perform file operations ... */ /* Unmount microSD card */ bsp_sdcard_unmount(); ``` Mount with Custom Configuration Some BSPs allow selecting between SDMMC and SPI interfaces for the SD card. Use the appropriate API function based on your hardware: ``` bsp_sdcard_cfg_t cfg = {0}; /* Mount SD card using SDMMC interface */ bsp_sdcard_sdmmc_mount(&cfg); ``` or ``` bsp_sdcard_cfg_t cfg = {0}; /* Mount SD card using SPI interface */ bsp_sdcard_sdspi_mount(&cfg) ``` > [!NOTE] > Not all BSPs support both SDMMC and SPI modes. Check the board documentation to see which interfaces are available. > If an unsupported interface is used, the API will return `ESP_ERR_NOT_SUPPORTED` error. ### After Mounting Once the SD card or SPIFFS is mounted, you can use standard file I/O functions (`fopen`, `fread`, `fwrite`, `fclose`, etc.) provided by ESP-IDF's VFS (Virtual File System). To print basic SD card information (after mounting), you can use: ``` sdmmc_card_t *sdcard = bsp_sdcard_get_handle(); sdmmc_card_print_info(stdout, sdcard); ``` > [!TIP] > The bsp_sdcard_get_handle() function returns a pointer to the sdmmc_card_t structure, which contains detailed information about the connected SD card. ### SD Card and SPIFFS API Reference ## Structures and Types | Type | Name | | ---: | :--- | | struct | [**bsp\_sdcard\_cfg\_t**](#struct-bsp_sdcard_cfg_t) _BSP SD card configuration structure._ | ## Functions | Type | Name | | ---: | :--- | | sdmmc\_card\_t \* | [**bsp\_sdcard\_get\_handle**](#function-bsp_sdcard_get_handle) (void) _Get SD card handle._ | | void | [**bsp\_sdcard\_get\_sdmmc\_host**](#function-bsp_sdcard_get_sdmmc_host) (const int slot, sdmmc\_host\_t \*config) _Get SD card MMC host config._ | | void | [**bsp\_sdcard\_get\_sdspi\_host**](#function-bsp_sdcard_get_sdspi_host) (const int slot, sdmmc\_host\_t \*config) _Get SD card SPI host config._ | | esp\_err\_t | [**bsp\_sdcard\_mount**](#function-bsp_sdcard_mount) (void) _Mount microSD card to virtual file system._ | | void | [**bsp\_sdcard\_sdmmc\_get\_slot**](#function-bsp_sdcard_sdmmc_get_slot) (const int slot, sdmmc\_slot\_config\_t \*config) _Get SD card MMC slot config._ | | esp\_err\_t | [**bsp\_sdcard\_sdmmc\_mount**](#function-bsp_sdcard_sdmmc_mount) ([**bsp\_sdcard\_cfg\_t**](#struct-bsp_sdcard_cfg_t) \*cfg) _Mount microSD card to virtual file system (MMC mode)_ | | void | [**bsp\_sdcard\_sdspi\_get\_slot**](#function-bsp_sdcard_sdspi_get_slot) (const spi\_host\_device\_t spi\_host, sdspi\_device\_config\_t \*config) _Get SD card SPI slot config._ | | esp\_err\_t | [**bsp\_sdcard\_sdspi\_mount**](#function-bsp_sdcard_sdspi_mount) ([**bsp\_sdcard\_cfg\_t**](#struct-bsp_sdcard_cfg_t) \*cfg) _Mount microSD card to virtual file system (SPI mode)_ | | esp\_err\_t | [**bsp\_sdcard\_unmount**](#function-bsp_sdcard_unmount) (void) _Unmount microSD card from virtual file system._ | | esp\_err\_t | [**bsp\_spiffs\_mount**](#function-bsp_spiffs_mount) (void) _Mount SPIFFS to virtual file system._ | | esp\_err\_t | [**bsp\_spiffs\_unmount**](#function-bsp_spiffs_unmount) (void) _Unmount SPIFFS from virtual file system._ | ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_SDSPI\_HOST**](#define-bsp_sdspi_host) (SDSPI\_DEFAULT\_HOST) | | define | [**BSP\_SD\_CLK**](#define-bsp_sd_clk) (GPIO\_NUM\_43) | | define | [**BSP\_SD\_CMD**](#define-bsp_sd_cmd) (GPIO\_NUM\_44) | | define | [**BSP\_SD\_D0**](#define-bsp_sd_d0) (GPIO\_NUM\_39) | | define | [**BSP\_SD\_D1**](#define-bsp_sd_d1) (GPIO\_NUM\_40) | | define | [**BSP\_SD\_D2**](#define-bsp_sd_d2) (GPIO\_NUM\_41) | | define | [**BSP\_SD\_D3**](#define-bsp_sd_d3) (GPIO\_NUM\_42) | | define | [**BSP\_SD\_MOUNT\_POINT**](#define-bsp_sd_mount_point) CONFIG\_BSP\_SD\_MOUNT\_POINT | | define | [**BSP\_SD\_SPI\_CLK**](#define-bsp_sd_spi_clk) (GPIO\_NUM\_43) | | define | [**BSP\_SD\_SPI\_CS**](#define-bsp_sd_spi_cs) (GPIO\_NUM\_42) | | define | [**BSP\_SD\_SPI\_MISO**](#define-bsp_sd_spi_miso) (GPIO\_NUM\_39) | | define | [**BSP\_SD\_SPI\_MOSI**](#define-bsp_sd_spi_mosi) (GPIO\_NUM\_44) | | define | [**BSP\_SPIFFS\_MOUNT\_POINT**](#define-bsp_spiffs_mount_point) CONFIG\_BSP\_SPIFFS\_MOUNT\_POINT | ## Structures and Types Documentation ### struct `bsp_sdcard_cfg_t` _BSP SD card configuration structure._ Variables: - sdmmc\_host\_t \* host - const esp\_vfs\_fat\_sdmmc\_mount\_config\_t \* mount - const sdmmc\_slot\_config\_t \* sdmmc - const sdspi\_device\_config\_t \* sdspi - union [**bsp\_sdcard\_cfg\_t**](#struct-bsp_sdcard_cfg_t) slot ## Functions Documentation ### function `bsp_sdcard_get_handle` _Get SD card handle._ ```c sdmmc_card_t * bsp_sdcard_get_handle ( void ) ``` **Returns:** SD card handle ### function `bsp_sdcard_get_sdmmc_host` _Get SD card MMC host config._ ```c void bsp_sdcard_get_sdmmc_host ( const int slot, sdmmc_host_t *config ) ``` **Parameters:** * `slot` SD card slot * `config` Structure which will be filled ### function `bsp_sdcard_get_sdspi_host` _Get SD card SPI host config._ ```c void bsp_sdcard_get_sdspi_host ( const int slot, sdmmc_host_t *config ) ``` **Parameters:** * `slot` SD card slot * `config` Structure which will be filled ### function `bsp_sdcard_mount` _Mount microSD card to virtual file system._ ```c esp_err_t bsp_sdcard_mount ( void ) ``` **Returns:** * ESP\_OK on success * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_fat\_sdmmc\_mount was already called * ESP\_ERR\_NO\_MEM if memory cannot be allocated * ESP\_FAIL if partition cannot be mounted * other error codes from SDMMC or SPI drivers, SDMMC protocol, or FATFS drivers ### function `bsp_sdcard_sdmmc_get_slot` _Get SD card MMC slot config._ ```c void bsp_sdcard_sdmmc_get_slot ( const int slot, sdmmc_slot_config_t *config ) ``` **Parameters:** * `slot` SD card slot * `config` Structure which will be filled ### function `bsp_sdcard_sdmmc_mount` _Mount microSD card to virtual file system (MMC mode)_ ```c esp_err_t bsp_sdcard_sdmmc_mount ( bsp_sdcard_cfg_t *cfg ) ``` **Parameters:** * `cfg` SD card configuration **Returns:** * ESP\_OK on success * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_fat\_sdmmc\_mount was already called * ESP\_ERR\_NO\_MEM if memory cannot be allocated * ESP\_FAIL if partition cannot be mounted * other error codes from SDMMC or SPI drivers, SDMMC protocol, or FATFS drivers ### function `bsp_sdcard_sdspi_get_slot` _Get SD card SPI slot config._ ```c void bsp_sdcard_sdspi_get_slot ( const spi_host_device_t spi_host, sdspi_device_config_t *config ) ``` **Parameters:** * `spi_host` SPI host ID * `config` Structure which will be filled ### function `bsp_sdcard_sdspi_mount` _Mount microSD card to virtual file system (SPI mode)_ ```c esp_err_t bsp_sdcard_sdspi_mount ( bsp_sdcard_cfg_t *cfg ) ``` **Parameters:** * `cfg` SD card configuration **Returns:** * ESP\_OK on success * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_fat\_sdmmc\_mount was already called * ESP\_ERR\_NO\_MEM if memory cannot be allocated * ESP\_FAIL if partition cannot be mounted * other error codes from SDMMC or SPI drivers, SDMMC protocol, or FATFS drivers ### function `bsp_sdcard_unmount` _Unmount microSD card from virtual file system._ ```c esp_err_t bsp_sdcard_unmount ( void ) ``` **Returns:** * ESP\_OK on success * ESP\_ERR\_NOT\_FOUND if the partition table does not contain FATFS partition with given label * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_fat\_spiflash\_mount was already called * ESP\_ERR\_NO\_MEM if memory can not be allocated * ESP\_FAIL if partition can not be mounted * other error codes from wear levelling library, SPI flash driver, or FATFS drivers ### function `bsp_spiffs_mount` _Mount SPIFFS to virtual file system._ ```c esp_err_t bsp_spiffs_mount ( void ) ``` **Returns:** * ESP\_OK on success * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_spiffs\_register was already called * ESP\_ERR\_NO\_MEM if memory can not be allocated * ESP\_FAIL if partition can not be mounted * other error codes ### function `bsp_spiffs_unmount` _Unmount SPIFFS from virtual file system._ ```c esp_err_t bsp_spiffs_unmount ( void ) ``` **Returns:** * ESP\_OK on success * ESP\_ERR\_NOT\_FOUND if the partition table does not contain SPIFFS partition with given label * ESP\_ERR\_INVALID\_STATE if esp\_vfs\_spiffs\_unregister was already called * ESP\_ERR\_NO\_MEM if memory can not be allocated * ESP\_FAIL if partition can not be mounted * other error codes ## :musical_note: Audio ### Initialization Before using speaker or microphone features, the audio codec must be initialized. ``` /* Initialize the speaker codec */ esp_codec_dev_handle_t spk_codec_dev = bsp_audio_codec_speaker_init(); /* Initialize the microphone codec */ esp_codec_dev_handle_t mic_codec_dev = bsp_audio_codec_microphone_init(); ``` After initialization, the [esp_codec_dev](https://components.espressif.com/components/espressif/esp_codec_dev) API can be used to control playback and recording. > [!NOTE] > Some BSPs may only support playback (speaker) or only input (microphone). Use the capability macros (`BSP_CAPS_AUDIO`, `BSP_CAPS_AUDIO_SPEAKER`, `BSP_CAPS_AUDIO_MIC`) to check supported features. ### Example of audio usage #### Speaker Below is an example of audio playback using the speaker (source data not included): ``` /* Set volume to 50% */ esp_codec_dev_set_out_vol(spk_codec_dev, 50); /* Define audio format */ esp_codec_dev_sample_info_t fs = { .sample_rate = wav_header.sample_rate, .channel = wav_header.num_channels, .bits_per_sample = wav_header.bits_per_sample, }; /* Open speaker stream */ esp_codec_dev_open(spk_codec_dev, &fs); ... /* Play audio data */ esp_codec_dev_write(spk_codec_dev, wav_bytes, wav_bytes_len); ... /* Close stream when done */ esp_codec_dev_close(spk_codec_dev); ``` > [!TIP] > Audio data must be in raw PCM format. Use a decoder if playing compressed formats (e.g., WAV, MP3). #### Microphone Below is an example of recording audio using the microphone (destination buffer not included): ``` /* Set input gain (optional) */ esp_codec_dev_set_in_gain(mic_codec_dev, 42.0); /* Define audio format */ esp_codec_dev_sample_info_t fs = { .sample_rate = 16000, .channel = 1, .bits_per_sample = 16, }; /* Open microphone stream */ esp_codec_dev_open(mic_codec_dev, &fs); /* Read recorded data */ esp_codec_dev_read(mic_codec_dev, recording_buffer, BUFFER_SIZE) ... /* Close stream when done */ esp_codec_dev_close(mic_codec_dev); ``` ### Audio API Reference ## Functions | Type | Name | | ---: | :--- | | esp\_codec\_dev\_handle\_t | [**bsp\_audio\_codec\_microphone\_init**](#function-bsp_audio_codec_microphone_init) (void) _Initialize microphone codec device._ | | esp\_codec\_dev\_handle\_t | [**bsp\_audio\_codec\_speaker\_init**](#function-bsp_audio_codec_speaker_init) (void) _Initialize speaker codec device._ | | esp\_err\_t | [**bsp\_audio\_init**](#function-bsp_audio_init) (const i2s\_std\_config\_t \*i2s\_config) _Init audio._ | ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_I2S\_DOUT**](#define-bsp_i2s_dout) (GPIO\_NUM\_9) | | define | [**BSP\_I2S\_DSIN**](#define-bsp_i2s_dsin) (GPIO\_NUM\_11) | | define | [**BSP\_I2S\_LCLK**](#define-bsp_i2s_lclk) (GPIO\_NUM\_10) | | define | [**BSP\_I2S\_MCLK**](#define-bsp_i2s_mclk) (GPIO\_NUM\_13) | | define | [**BSP\_I2S\_SCLK**](#define-bsp_i2s_sclk) (GPIO\_NUM\_12) | | define | [**BSP\_POWER\_AMP\_IO**](#define-bsp_power_amp_io) (GPIO\_NUM\_53) | ## Functions Documentation ### function `bsp_audio_codec_microphone_init` _Initialize microphone codec device._ ```c esp_codec_dev_handle_t bsp_audio_codec_microphone_init ( void ) ``` **Returns:** Pointer to codec device handle or NULL when error occurred ### function `bsp_audio_codec_speaker_init` _Initialize speaker codec device._ ```c esp_codec_dev_handle_t bsp_audio_codec_speaker_init ( void ) ``` **Returns:** Pointer to codec device handle or NULL when error occurred ### function `bsp_audio_init` _Init audio._ ```c esp_err_t bsp_audio_init ( const i2s_std_config_t *i2s_config ) ``` **Note:** There is no deinit audio function. Users can free audio resources by calling i2s\_del\_channel() **Warning:** The type of i2s\_config param is depending on IDF version. **Parameters:** * `i2s_config` I2S configuration. Pass NULL to use default values (Mono, duplex, 16bit, 22050 Hz) **Returns:** * ESP\_OK On success * ESP\_ERR\_NOT\_SUPPORTED The communication mode is not supported on the current chip * ESP\_ERR\_INVALID\_ARG NULL pointer or invalid configuration * ESP\_ERR\_NOT\_FOUND No available I2S channel found * ESP\_ERR\_NO\_MEM No memory for storing the channel information * ESP\_ERR\_INVALID\_STATE This channel has not initialized or already started ## :pager: Display and Touch ### Initialization ESP-BSP provides two ways to initialize the **display**, **touch** and **LVGL**. Simple method: ``` /* Initialize display, touch, and LVGL */ lv_display_t display = bsp_display_start(); ``` Configurable method: ``` bsp_display_cfg_t cfg = { .lvgl_port_cfg = ESP_LVGL_PORT_INIT_CONFIG(), /* See LVGL Port for more info */ .buffer_size = BSP_LCD_V_RES * BSP_LCD_H_RES, /* Screen buffer size in pixels */ .double_buffer = true, /* Allocate two buffers if true */ .flags = { .buff_dma = true, /* Use DMA-capable LVGL buffer */ .buff_spiram = false, /* Allocate buffer in PSRAM if true */ } }; cfg.lvgl_port_cfg.task_stack = 10000; /* Example: change LVGL task stack size */ /* Initialize display, touch, and LVGL */ lv_display_t display = bsp_display_start_with_config(&cfg); ``` After initialization, you can use the [LVGL](https://docs.lvgl.io/master/) API or [LVGL Port](../components/esp_lvgl_port/README.md) API. ### Initialization without LVGL - NoGLIB BSP To initialize the LCD without LVGL, use: ``` esp_lcd_panel_handle_t panel_handle; esp_lcd_panel_io_handle_t io_handle; const bsp_display_config_t bsp_disp_cfg = { .max_transfer_sz = (BSP_LCD_H_RES * 100) * sizeof(uint16_t), }; BSP_ERROR_CHECK_RETURN_NULL(bsp_display_new(&bsp_disp_cfg, &panel_handle, &io_handle)); ``` To initialize the LCD touch without LVGL, use: ``` esp_lcd_touch_handle_t tp; bsp_touch_new(NULL, &tp); ``` After initialization, you can use the [ESP-LCD](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/lcd/index.html) API and [ESP-LCD Touch](../components/lcd_touch/README.md) API. ### Set Brightness ``` /* Set display brightness to 100% */ bsp_display_backlight_on(); /* Set display brightness to 0% */ bsp_display_backlight_off(); /* Set display brightness to 50% */ bsp_display_brightness_set(50); ``` > [!NOTE] > Some boards do not support changing brightness. They return an `ESP_ERR_NOT_SUPPORTED` error. ### LVGL API Usage (only when initialized with LVGL) All LVGL calls must be protected using lock/unlock: ``` /* Wait until other tasks finish screen operations */ bsp_display_lock(0); ... lv_obj_t * screen = lv_disp_get_scr_act(disp_handle); lv_obj_t * obj = lv_label_create(screen); ... /* Unlock after screen operations are done */ bsp_display_unlock(); ``` ### Screen rotation (only when initialized with LVGL) ``` bsp_display_lock(0); /* Rotate display to 90 */ bsp_display_rotate(display, LV_DISPLAY_ROTATION_90); bsp_display_unlock(); ``` > [!NOTE] > Some LCDs do not support hardware rotation and instead use software rotation, which consumes more memory. ### Available constants Constants like screen resolution, pin configuration, and other options are defined in the BSP header files (`{bsp_name}.h`, `display.h`, `touch.h`). Below are some of the most relevant predefined constants: - `BSP_LCD_H_RES` - Horizontal resolution in pixels - `BSP_LCD_V_RES` - Vertical resolution in pixels - `BSP_LCD_SPI_NUM` - SPI bus used by the LCD (if applicable) ### Display and Touch API Reference ## Structures and Types | Type | Name | | ---: | :--- | | struct | [**bsp\_display\_cfg\_t**](#struct-bsp_display_cfg_t) _BSP display configuration structure._ | | struct | [**bsp\_display\_config\_t**](#struct-bsp_display_config_t) _BSP display configuration structure._ | | enum | [**bsp\_hdmi\_resolution\_t**](#enum-bsp_hdmi_resolution_t) _BSP HDMI resolution types._ | | struct | [**bsp\_lcd\_handles\_t**](#struct-bsp_lcd_handles_t) _BSP display return handles._ | | struct | [**bsp\_touch\_config\_t**](#struct-bsp_touch_config_t) _BSP touch configuration structure._ | ## Functions | Type | Name | | ---: | :--- | | esp\_err\_t | [**bsp\_display\_backlight\_off**](#function-bsp_display_backlight_off) (void) _Turn off display backlight._ | | esp\_err\_t | [**bsp\_display\_backlight\_on**](#function-bsp_display_backlight_on) (void) _Turn on display backlight._ | | esp\_err\_t | [**bsp\_display\_brightness\_deinit**](#function-bsp_display_brightness_deinit) (void) _Deinitialize display's brightness._ | | esp\_err\_t | [**bsp\_display\_brightness\_init**](#function-bsp_display_brightness_init) (void) _Initialize display's brightness._ | | esp\_err\_t | [**bsp\_display\_brightness\_set**](#function-bsp_display_brightness_set) (int brightness\_percent) _Set display's brightness._ | | void | [**bsp\_display\_delete**](#function-bsp_display_delete) (void) _Delete display panel._ | | lv\_indev\_t \* | [**bsp\_display\_get\_input\_dev**](#function-bsp_display_get_input_dev) (void) _Get pointer to input device (touch, buttons, ...)_ | | bool | [**bsp\_display\_lock**](#function-bsp_display_lock) (uint32\_t timeout\_ms) _Take LVGL mutex._ | | esp\_err\_t | [**bsp\_display\_new**](#function-bsp_display_new) (const [**bsp\_display\_config\_t**](#struct-bsp_display_config_t) \*config, esp\_lcd\_panel\_handle\_t \*ret\_panel, esp\_lcd\_panel\_io\_handle\_t \*ret\_io) _Create new display panel._ | | esp\_err\_t | [**bsp\_display\_new\_with\_handles**](#function-bsp_display_new_with_handles) (const [**bsp\_display\_config\_t**](#struct-bsp_display_config_t) \*config, [**bsp\_lcd\_handles\_t**](#struct-bsp_lcd_handles_t) \*ret\_handles) _Create new display panel._ | | void | [**bsp\_display\_rotate**](#function-bsp_display_rotate) (lv\_display\_t \*disp, lv\_disp\_rotation\_t rotation) _Rotate screen._ | | lv\_display\_t \* | [**bsp\_display\_start**](#function-bsp_display_start) (void) _Initialize display._ | | lv\_display\_t \* | [**bsp\_display\_start\_with\_config**](#function-bsp_display_start_with_config) (const [**bsp\_display\_cfg\_t**](#struct-bsp_display_cfg_t) \*cfg) _Initialize display._ | | void | [**bsp\_display\_stop**](#function-bsp_display_stop) (lv\_display\_t \*display) _Deinitialize display._ | | void | [**bsp\_display\_unlock**](#function-bsp_display_unlock) (void) _Give LVGL mutex._ | | void | [**bsp\_touch\_delete**](#function-bsp_touch_delete) (void) _Deinitialize touch._ | | esp\_err\_t | [**bsp\_touch\_new**](#function-bsp_touch_new) (const [**bsp\_touch\_config\_t**](#struct-bsp_touch_config_t) \*config, esp\_lcd\_touch\_handle\_t \*ret\_touch) _Create new touchscreen._ | ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_LCD\_BACKLIGHT**](#define-bsp_lcd_backlight) (GPIO\_NUM\_23) | | define | [**BSP\_LCD\_BIGENDIAN**](#define-bsp_lcd_bigendian) (0) | | define | [**BSP\_LCD\_BITS\_PER\_PIXEL**](#define-bsp_lcd_bits_per_pixel) (16) | | define | [**BSP\_LCD\_COLOR\_FORMAT**](#define-bsp_lcd_color_format) (ESP\_LCD\_COLOR\_FORMAT\_RGB565) | | define | [**BSP\_LCD\_COLOR\_SPACE**](#define-bsp_lcd_color_space) (ESP\_LCD\_COLOR\_SPACE\_RGB) | | define | [**BSP\_LCD\_DRAW\_BUFF\_DOUBLE**](#define-bsp_lcd_draw_buff_double) (0) | | define | [**BSP\_LCD\_DRAW\_BUFF\_SIZE**](#define-bsp_lcd_draw_buff_size) (BSP\_LCD\_H\_RES \* 50) | | define | [**BSP\_LCD\_H\_RES**](#define-bsp_lcd_h_res) (800) | | define | [**BSP\_LCD\_MIPI\_DSI\_LANE\_BITRATE\_MBPS**](#define-bsp_lcd_mipi_dsi_lane_bitrate_mbps) (1000) | | define | [**BSP\_LCD\_MIPI\_DSI\_LANE\_NUM**](#define-bsp_lcd_mipi_dsi_lane_num) (2) | | define | [**BSP\_LCD\_PIXEL\_CLOCK\_MHZ**](#define-bsp_lcd_pixel_clock_mhz) (80) | | define | [**BSP\_LCD\_RST**](#define-bsp_lcd_rst) (GPIO\_NUM\_NC) | | define | [**BSP\_LCD\_TOUCH\_INT**](#define-bsp_lcd_touch_int) (GPIO\_NUM\_NC) | | define | [**BSP\_LCD\_TOUCH\_RST**](#define-bsp_lcd_touch_rst) (GPIO\_NUM\_NC) | | define | [**BSP\_LCD\_V\_RES**](#define-bsp_lcd_v_res) (1280) | | define | [**BSP\_MIPI\_DSI\_PHY\_PWR\_LDO\_CHAN**](#define-bsp_mipi_dsi_phy_pwr_ldo_chan) (3) | | define | [**BSP\_MIPI\_DSI\_PHY\_PWR\_LDO\_VOLTAGE\_MV**](#define-bsp_mipi_dsi_phy_pwr_ldo_voltage_mv) (2500) | | define | [**ESP\_LCD\_COLOR\_FORMAT\_RGB565**](#define-esp_lcd_color_format_rgb565) (1) | | define | [**ESP\_LCD\_COLOR\_FORMAT\_RGB888**](#define-esp_lcd_color_format_rgb888) (2) | ## Structures and Types Documentation ### struct `bsp_display_cfg_t` _BSP display configuration structure._ Variables: - unsigned int buff_dma Allocated LVGL buffer will be DMA capable - unsigned int buff_spiram Allocated LVGL buffer will be in PSRAM - uint32\_t buffer_size Size of the buffer for the screen in pixels - bool double_buffer True, if should be allocated two buffers - struct [**bsp\_display\_cfg\_t**](#struct-bsp_display_cfg_t) flags - [**bsp\_display\_config\_t**](#struct-bsp_display_config_t) hw_cfg Display HW configuration - lvgl\_port\_cfg\_t lvgl_port_cfg LVGL port configuration - unsigned int sw_rotate Use software rotation (slower), The feature is unavailable under avoid-tear mode ### struct `bsp_display_config_t` _BSP display configuration structure._ Variables: - struct [**bsp\_display\_config\_t**](#struct-bsp_display_config_t) dsi_bus - [**bsp\_hdmi\_resolution\_t**](#enum-bsp_hdmi_resolution_t) hdmi_resolution HDMI resolution selection - uint32\_t lane_bit_rate_mbps DSI bus config - lane bit rate - mipi\_dsi\_phy\_clock\_source\_t phy_clk_src DSI bus config - clock source ### enum `bsp_hdmi_resolution_t` _BSP HDMI resolution types._ ```c enum bsp_hdmi_resolution_t { BSP_HDMI_RES_NONE = 0, BSP_HDMI_RES_800x600, BSP_HDMI_RES_1024x768, BSP_HDMI_RES_1280x720, BSP_HDMI_RES_1280x800, BSP_HDMI_RES_1920x1080 }; ``` ### struct `bsp_lcd_handles_t` _BSP display return handles._ Variables: - esp\_lcd\_panel\_handle\_t control ESP LCD panel (control) handle - esp\_lcd\_panel\_io\_handle\_t io ESP LCD IO handle - esp\_lcd\_dsi\_bus\_handle\_t mipi_dsi_bus MIPI DSI bus handle - esp\_lcd\_panel\_handle\_t panel ESP LCD panel (color) handle ### struct `bsp_touch_config_t` _BSP touch configuration structure._ Variables: - void \* dummy Prepared for future use. ## Functions Documentation ### function `bsp_display_backlight_off` _Turn off display backlight._ ```c esp_err_t bsp_display_backlight_off ( void ) ``` Brightness is controlled with PWM signal to a pin controlling backlight. Brightness must be already initialized by calling [**bsp\_display\_brightness\_init()**](#function-bsp_display_brightness_init) or[**bsp\_display\_new()**](#function-bsp_display_new) **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error ### function `bsp_display_backlight_on` _Turn on display backlight._ ```c esp_err_t bsp_display_backlight_on ( void ) ``` Brightness is controlled with PWM signal to a pin controlling backlight. Brightness must be already initialized by calling [**bsp\_display\_brightness\_init()**](#function-bsp_display_brightness_init) or[**bsp\_display\_new()**](#function-bsp_display_new) **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error ### function `bsp_display_brightness_deinit` _Deinitialize display's brightness._ ```c esp_err_t bsp_display_brightness_deinit ( void ) ``` ### function `bsp_display_brightness_init` _Initialize display's brightness._ ```c esp_err_t bsp_display_brightness_init ( void ) ``` Brightness is controlled with PWM signal to a pin controlling backlight. **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error ### function `bsp_display_brightness_set` _Set display's brightness._ ```c esp_err_t bsp_display_brightness_set ( int brightness_percent ) ``` Brightness is controlled with PWM signal to a pin controlling backlight. Brightness must be already initialized by calling [**bsp\_display\_brightness\_init()**](#function-bsp_display_brightness_init) or[**bsp\_display\_new()**](#function-bsp_display_new) **Parameters:** * `brightness_percent` Brightness in [%] **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error ### function `bsp_display_delete` _Delete display panel._ ```c void bsp_display_delete ( void ) ``` ### function `bsp_display_get_input_dev` _Get pointer to input device (touch, buttons, ...)_ ```c lv_indev_t * bsp_display_get_input_dev ( void ) ``` **Note:** The LVGL input device is initialized in [**bsp\_display\_start()**](#function-bsp_display_start) function. **Returns:** Pointer to LVGL input device or NULL when not initialized ### function `bsp_display_lock` _Take LVGL mutex._ ```c bool bsp_display_lock ( uint32_t timeout_ms ) ``` **Parameters:** * `timeout_ms` Timeout in [ms]. 0 will block indefinitely. **Returns:** true Mutex was taken **Returns:** false Mutex was NOT taken ### function `bsp_display_new` _Create new display panel._ ```c esp_err_t bsp_display_new ( const bsp_display_config_t *config, esp_lcd_panel_handle_t *ret_panel, esp_lcd_panel_io_handle_t *ret_io ) ``` For maximum flexibility, this function performs only reset and initialization of the display. You must turn on the display explicitly by calling esp\_lcd\_panel\_disp\_on\_off(). The display's backlight is not turned on either. You can use bsp\_display\_backlight\_on/off(), [**bsp\_display\_brightness\_set()**](#function-bsp_display_brightness_set) (on supported boards) or implement your own backlight control. If you want to free resources allocated by this function, you can use esp\_lcd API, ie.: ````cpp esp_lcd_panel_del(panel); esp_lcd_panel_io_del(io); esp_lcd_del_dsi_bus(mipi_dsi_bus); ```` **Parameters:** * `config` display configuration * `ret_panel` esp\_lcd panel handle * `ret_io` esp\_lcd IO handle **Returns:** * ESP\_OK On success * Else esp\_lcd failure ### function `bsp_display_new_with_handles` _Create new display panel._ ```c esp_err_t bsp_display_new_with_handles ( const bsp_display_config_t *config, bsp_lcd_handles_t *ret_handles ) ``` For maximum flexibility, this function performs only reset and initialization of the display. You must turn on the display explicitly by calling esp\_lcd\_panel\_disp\_on\_off(). The display's backlight is not turned on either. You can use bsp\_display\_backlight\_on/off(), [**bsp\_display\_brightness\_set()**](#function-bsp_display_brightness_set) (on supported boards) or implement your own backlight control. If you want to free resources allocated by this function, you can use API: ````cpp bsp_display_delete(); ```` **Parameters:** * `config` display configuration * `ret_handles` all esp\_lcd handles in one structure **Returns:** * ESP\_OK On success * Else esp\_lcd failure ### function `bsp_display_rotate` _Rotate screen._ ```c void bsp_display_rotate ( lv_display_t *disp, lv_disp_rotation_t rotation ) ``` Display must be already initialized by calling [**bsp\_display\_start()**](#function-bsp_display_start) **Parameters:** * `disp` Pointer to LVGL display * `rotation` Angle of the display rotation ### function `bsp_display_start` _Initialize display._ ```c lv_display_t * bsp_display_start ( void ) ``` This function initializes MIPI-DSI, display controller and starts LVGL handling task. LCD backlight must be enabled separately by calling [**bsp\_display\_brightness\_set()**](#function-bsp_display_brightness_set) **Returns:** Pointer to LVGL display or NULL when error occured ### function `bsp_display_start_with_config` _Initialize display._ ```c lv_display_t * bsp_display_start_with_config ( const bsp_display_cfg_t *cfg ) ``` This function initializes MIPI-DSI, display controller and starts LVGL handling task. LCD backlight must be enabled separately by calling [**bsp\_display\_brightness\_set()**](#function-bsp_display_brightness_set) **Parameters:** * `cfg` display configuration **Returns:** Pointer to LVGL display or NULL when error occured ### function `bsp_display_stop` _Deinitialize display._ ```c void bsp_display_stop ( lv_display_t *display ) ``` This function deinitializes MIPI-DSI, display controller and stops LVGL. **Parameters:** * `display` Pointer to LVGL display ### function `bsp_display_unlock` _Give LVGL mutex._ ```c void bsp_display_unlock ( void ) ``` ### function `bsp_touch_delete` _Deinitialize touch._ ```c void bsp_touch_delete ( void ) ``` ### function `bsp_touch_new` _Create new touchscreen._ ```c esp_err_t bsp_touch_new ( const bsp_touch_config_t *config, esp_lcd_touch_handle_t *ret_touch ) ``` If you want to free resources allocated by this function, you can use API: ````cpp bsp_touch_delete(); ```` **Parameters:** * `config` touch configuration * `ret_touch` esp\_lcd\_touch touchscreen handle **Returns:** * ESP\_OK On success * Else esp\_lcd\_touch failure ## :electric_plug: USB Boards with USB support define macros for USB pins, such as `BSP_USB_POS` and `BSP_USB_NEG`, and may also provide control APIs for enabling or disabling USB functionality. ``` /* Initialize USB in device mode and enable power */ bsp_usb_host_start(BSP_USB_HOST_POWER_MODE_USB_DEV, true); ... /* Deinitialize and stop USB */ bsp_usb_host_stop(); ``` > [!NOTE] > Not all BSPs implement USB support or provide power control. Refer to the board's documentation and the BSP header files for available functions and supported modes. For more USB-related APIs and configuration options, check the corresponding BSP header files. ### USB API Reference ## Structures and Types | Type | Name | | ---: | :--- | | enum | [**bsp\_usb\_host\_power\_mode\_t**](#enum-bsp_usb_host_power_mode_t) _Power modes of USB Host connector._ | | typedef enum [**bsp\_usb\_host\_power\_mode\_t**](#enum-bsp_usb_host_power_mode_t) | [**bsp\_usb\_host\_power\_mode\_t**](#typedef-bsp_usb_host_power_mode_t) _Power modes of USB Host connector._ | ## Functions | Type | Name | | ---: | :--- | | esp\_err\_t | [**bsp\_usb\_host\_start**](#function-bsp_usb_host_start) ([**bsp\_usb\_host\_power\_mode\_t**](#enum-bsp_usb_host_power_mode_t) mode, bool limit\_500mA) _Start USB host._ | | esp\_err\_t | [**bsp\_usb\_host\_stop**](#function-bsp_usb_host_stop) (void) _Stop USB host._ | ## Macros | Type | Name | | ---: | :--- | | define | [**BSP\_USB\_NEG**](#define-bsp_usb_neg) (GPIO\_NUM\_19) | | define | [**BSP\_USB\_POS**](#define-bsp_usb_pos) (GPIO\_NUM\_20) | ## Structures and Types Documentation ### enum `bsp_usb_host_power_mode_t` _Power modes of USB Host connector._ ```c enum bsp_usb_host_power_mode_t { BSP_USB_HOST_POWER_MODE_USB_DEV }; ``` ### typedef `bsp_usb_host_power_mode_t` _Power modes of USB Host connector._ ```c typedef enum bsp_usb_host_power_mode_t bsp_usb_host_power_mode_t; ``` ## Functions Documentation ### function `bsp_usb_host_start` _Start USB host._ ```c esp_err_t bsp_usb_host_start ( bsp_usb_host_power_mode_t mode, bool limit_500mA ) ``` This is a one-stop-shop function that will configure the board for USB Host mode and start USB Host library **Parameters:** * `mode` USB Host connector power mode (Not used on this board) * `limit_500mA` Limit output current to 500mA (Not used on this board) **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error * ESP\_ERR\_NO\_MEM Memory cannot be allocated ### function `bsp_usb_host_stop` _Stop USB host._ ```c esp_err_t bsp_usb_host_stop ( void ) ``` USB Host lib will be uninstalled and power from connector removed. **Returns:** * ESP\_OK On success * ESP\_ERR\_INVALID\_ARG Parameter error

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