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49 lines
2.5 KiB
Markdown
49 lines
2.5 KiB
Markdown
# ESP Hardware Abstraction Layer for I2S Peripheral(s)
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> [!NOTE]
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> This component is currently in beta. Its API, behavior, and compatibility may change at any time and without notice; backward compatibility is not guaranteed. Use caution when integrating into production systems.
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## Overview
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The `esp_hal_i2s` component provides a **Hardware Abstraction Layer** for Inter-IC Sound (I2S) controllers across all ESP-IDF supported targets. I2S is a serial bus interface standard used for connecting digital audio devices, enabling high-quality audio data transmission between integrated circuits.
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## Architecture
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The I2S HAL is structured in two main sub-layers:
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1. **HAL Layer (Upper)**: Defines the operational steps and data structures required to control I2S peripherals (e.g., initialization, clock configuration, STD/TDM/PDM slot configuration, channel enable/disable).
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2. **Low-Level Layer (Bottom)**: Serves as a translation layer between the HAL and the register files defined in the `soc` component, handling target-specific register configurations.
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## Supported I2S Controllers
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This HAL supports two I2S controller types depending on the ESP chip:
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- **Standard I2S**: Traditional I2S interface supporting master/slave modes. And the different hardware versions are supported regarding different chips.
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- **Low-Power I2S (LP I2S)**: Power-efficient I2S controller for low-power applications (on supported chips)
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## Features
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- **Multiple Audio Formats**:
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- Standard I2S (STD) mode
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- Pulse Density Modulation (PDM) mode
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- Time Division Multiplexing (TDM) mode
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- **Master/Slave Mode Support**: Configurable as master or slave device
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- **Bidirectional Communication**: Independent TX and RX channel configuration
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- **Clock Configuration**: Precise master clock (MCLK) and bit clock (BCLK) division
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- **Slot Configuration**: Mono/stereo mode, slot selection, bit width configuration
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- **PDM/PCM Converter Features**: PCM-to-PDM and PDM-to-PCM conversion, high-pass filtering (on supported chips)
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- **TDM Features**: Multi-slot TDM support with configurable slot masks
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- **Signal Connection Management**: GPIO signal mapping and interrupt configuration
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## Usage
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The HAL functions primarily serve ESP-IDF peripheral drivers such as `esp_driver_i2s`.
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Advanced developers can use these interfaces directly when implementing custom drivers, with the understanding that API stability is not guaranteed.
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## Dependencies
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- `soc`: Provides chip-specific register definitions
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- `hal`: Core hardware abstraction utilities and macros
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