The CrowPanel 7.0″ ESP32-S3 HMI Display integrates various peripherals, including an I2S DAC (specifically, the NS4168 amplifier) and an SD card interface. Below is a detailed GPIO mapping to assist in your development:Electronics-Lab.com
🎵 I2S Audio (NS4168 DAC)
The CrowPanel utilizes the NS4168 stereo Class-D amplifier with a built-in I2S DAC for audio output. The typical GPIO assignments for I2S audio are:
- I2S_SDIN (Data Input): GPIO17
- I2S_LRCLK (Word Select / Left-Right Clock): GPIO18
- I2S_BCLK (Bit Clock): GPIO42Elecrow+8Embedded+8Home Assistant Community+8Little Bird+11Flux+11Home Assistant Community+11Embedded+20Elecrow+20Little Bird+20
These pins facilitate the transmission of digital audio data from the ESP32-S3 to the NS4168 amplifier.
💾 SD Card Interface (TF Slot)
The CrowPanel features a built-in TF card slot for SD card access. The GPIO assignments for the SD card interface are:
- SD_CMD: GPIO11
- SD_CLK: GPIO12
- SD_D0: GPIO13
- SD_D1: GPIO14
- SD_D2: GPIO15
- SD_D3: GPIO16Espressif DocsEmbedded+5Electronics-Lab.com+5Elecrow+5GitHub+12Little Bird+12Elecrow+12
These pins are configured for 4-bit SDMMC mode, providing efficient data transfer rates suitable for audio playback and file management.
🖥️ Display and Touch Interface
The CrowPanel’s 7.0″ display operates using a parallel RGB interface, consuming several GPIOs for data lines, synchronization, and control signals. Additionally, the capacitive touch functionality is managed via an I2C interface. The typical GPIO assignments are:
- Display Data Lines and Control Signals: GPIOs 0–10 (specific assignments depend on the display controller)
- Touch I2C SDA: GPIO4
- Touch I2C SCL: GPIO5Elecrow+7Makerguides.com+7Elecrow+7Reddit+4Flux+4Elecrow+4
These assignments ensure seamless integration of the display and touch functionalities with the ESP32-S3 module.
🔄 Multiplexing Considerations
Due to the limited number of GPIOs on the ESP32-S3, the CrowPanel employs multiplexing techniques to manage multiple peripherals. For instance, certain GPIOs are shared between the SD card interface and the I2S audio output. To switch between these functionalities, the CrowPanel uses analog switches controlled via I2C commands. This design allows dynamic reconfiguration of GPIO assignments based on the active peripheral, optimizing the use of available pins.
📘 Additional Resources
For a practical example of implementing audio playback using the CrowPanel’s integrated amplifier, refer to the following tutorial provided by Elecrow:
This resource offers guidance on setting up the I2S interface and configuring the ESP32-S3 to work with the NS4168 amplifier.