morris
ae8acf82e7
Enable esp32s31 RMT caps and clock source definitions for esp_driver_rmt. Add esp32s31 RMT LL/periph hooks, sleep retention metadata, and RMTMEM linker symbol.
ESP Hardware Abstraction Layer for RMT Peripheral
Note
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.
Overview
The esp_hal_rmt component provides a Hardware Abstraction Layer for the RMT (Remote Control Transceiver) peripherals across all ESP-IDF supported targets. It serves as a foundation for the higher-level RMT drivers, offering a consistent interface to interact with RMT hardware while hiding the complexities of chip-specific implementations.
Architecture
The HAL architecture consists of two primary layers:
-
HAL Layer (Upper): Defines the operational sequences and data structures required to interact with RMT peripherals, including:
- Initialization and de-initialization
- TX/RX channel control operations
- Memory and DMA management
- Carrier and modulation configuration
-
Low-Level Layer (Bottom): Acts as a translation layer between the HAL and the register definitions in the
soccomponent, handling:- Register access abstractions
- Chip-specific register configurations
- Hardware feature compatibility
Features
- Unified RMT interface across all ESP chip families
- Support for both transmit and receive channels
- Flexible pulse timing and encoding capabilities
- Carrier wave modulation for IR remote control
- Loop transmission mode for repeated patterns
- DMA support on capable chips for large data transfers
- Multiple clock source options
- Memory block allocation and management
Usage
This component is primarily used by ESP-IDF peripheral drivers such as esp_driver_rmt.
For advanced developers implementing custom RMT solutions, the HAL functions can be used directly. However, please note that the interfaces provided by this component are internal to ESP-IDF and are subject to change.
Dependencies
soc: Provides chip-specific register definitionshal: Core hardware abstraction utilities and macros