esp-hal 1.2.0

Bare-metal HAL for Espressif devices
Documentation 
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# esp-hal

[![Crates.io](https://img.shields.io/crates/v/esp-hal?labelColor=1C2C2E&color=C96329&logo=Rust&style=flat-square)](https://crates.io/crates/esp-hal)
[![docs.rs](https://img.shields.io/docsrs/esp-hal?labelColor=1C2C2E&color=C96329&logo=rust&style=flat-square)](https://docs.espressif.com/projects/rust/esp-hal/latest/)
![MSRV](https://img.shields.io/badge/MSRV-1.95.0-blue?labelColor=1C2C2E&style=flat-square)
![Crates.io](https://img.shields.io/crates/l/esp-hal?labelColor=1C2C2E&style=flat-square)
[![Matrix](https://img.shields.io/matrix/esp-rs:matrix.org?label=join%20matrix&labelColor=1C2C2E&color=BEC5C9&logo=matrix&style=flat-square)](https://matrix.to/#/#esp-rs:matrix.org)

Bare-metal (`no_std`) hardware abstraction layer for Espressif devices.

Implements a number of blocking and, where applicable, async traits from the various packages in the [embedded-hal] repository.

For help getting started with this HAL, please refer to [The Rust on ESP Book] and the [documentation].

[embedded-hal]: https://github.com/rust-embedded/embedded-hal
[the rust on esp book]: https://docs.espressif.com/projects/rust/book/

## [Documentation]

[documentation]: https://docs.espressif.com/projects/rust/

## Supported Devices

<!-- The following table is machine generated. Do not edit the comments and the table by hand! -->
<!-- start supported devices table -->
| Chip  | Documentation | Target | Note  |
| :---: | :-----------: | :----: | :---: |
| ESP32 | [Datasheet][esp32-datasheet] [TRM][esp32-trm] | `xtensa-esp32-none-elf` | Revisions below v3.0 are not supported. |
| ESP32-C2 | [Datasheet][esp32c2-datasheet] [TRM][esp32c2-trm] | `riscv32imc-unknown-none-elf` |  |
| ESP32-C3 | [Datasheet][esp32c3-datasheet] [TRM][esp32c3-trm] | `riscv32imc-unknown-none-elf` |  |
| ESP32-C5 | [Datasheet][esp32c5-datasheet] [TRM][esp32c5-trm] | `riscv32imac-unknown-none-elf` |  |
| ESP32-C6 | [Datasheet][esp32c6-datasheet] [TRM][esp32c6-trm] | `riscv32imac-unknown-none-elf` |  |
| ESP32-C61 | [Datasheet][esp32c61-datasheet] [TRM][esp32c61-trm] | `riscv32imac-unknown-none-elf` |  |
| ESP32-H2 | [Datasheet][esp32h2-datasheet] [TRM][esp32h2-trm] | `riscv32imac-unknown-none-elf` |  |
| ESP32-P4 | [Datasheet][esp32p4-datasheet] [TRM][esp32p4-trm] | `riscv32imafc-unknown-none-elf` | Revisions below v3.0 are not supported. |
| ESP32-S2 | [Datasheet][esp32s2-datasheet] [TRM][esp32s2-trm] | `xtensa-esp32s2-none-elf` |  |
| ESP32-S3 | [Datasheet][esp32s3-datasheet] [TRM][esp32s3-trm] | `xtensa-esp32s3-none-elf` |  |
| ESP32-S31 | [Datasheet][esp32s31-datasheet] [TRM][esp32s31-trm] | `riscv32imafc-unknown-none-elf` | In early stages of development. |

[esp32-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32_datasheet_en.pdf
[esp32-trm]: https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
[esp32c2-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp8684_datasheet_en.pdf
[esp32c2-trm]: https://www.espressif.com/sites/default/files/documentation/esp8684_technical_reference_manual_en.pdf
[esp32c3-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-c3_datasheet_en.pdf
[esp32c3-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-c3_technical_reference_manual_en.pdf
[esp32c5-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-c5_datasheet_en.pdf
[esp32c5-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-c5_technical_reference_manual_en.pdf
[esp32c6-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-c6_datasheet_en.pdf
[esp32c6-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-c6_technical_reference_manual_en.pdf
[esp32c61-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-c61_datasheet_en.pdf
[esp32c61-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-c61_technical_reference_manual_en.pdf
[esp32h2-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-h2_datasheet_en.pdf
[esp32h2-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-h2_technical_reference_manual_en.pdf
[esp32p4-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-p4_datasheet_en.pdf
[esp32p4-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-p4_technical_reference_manual_en.pdf
[esp32s2-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-s2_datasheet_en.pdf
[esp32s2-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-s2_technical_reference_manual_en.pdf
[esp32s3-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf
[esp32s3-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-s3_technical_reference_manual_en.pdf
[esp32s31-datasheet]: https://www.espressif.com/sites/default/files/documentation/esp32-s31_datasheet_en.pdf
[esp32s31-trm]: https://www.espressif.com/sites/default/files/documentation/esp32-s31_technical_reference_manual_en.pdf
<!-- end supported devices table -->

## Peripheral support

<!-- The following table is machine generated. Do not edit the comments and the table by hand! -->
<!-- start chip support table -->
 * Empty cell: Not available
 * ❌: Not supported
 * ⚒️: Partial support
 * ✔️: Supported

### GPIO

| Driver         | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| -------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| GPIO           | ✔️   | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       |
| Dedicated GPIO |       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| IOMUX          | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| LP IO          | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ❌        |

### Serial interfaces

| Driver          | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| --------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| UART            | [✔️][6138] [^1] | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       |
| LP UART         |       |          |          | [❌][5155] [^1] | ⚒️      |           |          | ❌       |          |          | ❌        |
| UHCI            | ❌    |          | ⚒️      | ⚒️      | ⚒️      |           | ⚒️      | ⚒️      | ❌       | ⚒️      | ⚒️       |
| I2C master      | ✔️   | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       |
| LP I2C master   | ❌    |          |          | ⚒️      | ⚒️      |           |          | ⚒️      | ❌       | ⚒️      | ❌        |
| I2C slave       | [❌][1909] [^1] |          | ⚒️      | [❌][1909] [^1] | ⚒️      | [❌][1909] [^1] | [❌][1909] [^1] | ❌       | [❌][1909] [^1] | [❌][1909] [^1] | ❌        |
| I3C master      |       |          |          |          |          |           |          | ❌       |          |          |           |
| I3C slave       |       |          |          |          |          |           |          | ❌       |          |          |           |
| SPI master      | ✔️   | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       | ✔️      | ✔️      | ✔️      | ✔️      | ✔️       |
| SPI slave       | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| LP SPI master   |       |          |          |          |          |           |          | ❌       |          |          |           |
| LP SPI slave    |       |          |          |          |          |           |          | ❌       |          |          |           |
| I2S             | ⚒️   |          | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ❌        |
| LP I2S          |       |          |          |          |          |           |          | ❌       |          |          |           |
| PARL_IO         |       |          |          | ⚒️      | ⚒️      |           | ⚒️      | ❌       |          |          | ❌        |
| RMT             | ⚒️   |          | ⚒️      | ⚒️      | ⚒️      |           | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| SDMMC/SDIO host | ⚒️   |          |          |          |          |           |          | ⚒️      |          | ⚒️      | ⚒️       |
| SDIO slave      | ❌    |          |          | [❌][5169] [^1] | ❌       | [❌][5417] [^1] |          |          |          |          |           |
| TWAI            | ⚒️   |          | ⚒️      |          | ⚒️      |           | ⚒️      | ❌       | ⚒️      | ⚒️      |           |
| CANFD           |       |          |          | [❌][5163] [^1] |          |           |          |          |          |          | ❌        |
| USB OTG FS      |       |          |          |          |          |           |          | ⚒️      | ⚒️      | ⚒️      |           |
| USB OTG HS      |       |          |          |          |          |           |          | ⚒️      |          |          | ⚒️       |
| USB Serial/JTAG |       |          | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      |          | ⚒️      | ⚒️       |

### Wireless and networking

| Driver        | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| Bluetooth     | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      |          |          | ⚒️      | ❌        |
| WIFI          | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |          |          | ⚒️      | ⚒️      | ❌        |
| IEEE 802.15.4 |       |          |          | ⚒️      | ⚒️      |           | ⚒️      |          |          |          | ❌        |
| Ethernet      | ⚒️   |          |          |          |          |           |          | ⚒️      |          |          | ❌        |

### Display and camera

| Driver            | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ----------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| Camera interface  | ❌    |          |          |          |          |           |          | ❌       | ❌       | ⚒️      | ❌        |
| MIPI-CSI          |       |          |          |          |          |           |          | ❌       |          |          |           |
| MIPI-DSI          |       |          |          |          |          |           |          | ⚒️      |          |          |           |
| RGB display       | ⚒️   |          |          |          |          |           |          | ❌       | ❌       | ⚒️      | ❌        |
| SPI LCD interface |       |          |          |          |          |           |          |          | [❌][5374] [^1] |          |           |

### Signal processing

| Driver                       | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ---------------------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| Bit Scrambler                |       |          |          | [❌][5170] [^1] |          |           |          | ❌       |          |          | ❌        |
| Image Signal Processor       |       |          |          |          |          |           |          | ❌       |          |          |           |
| Pixel Processing Accelerator |       |          |          |          |          |           |          | ❌       |          |          | ❌        |
| JPEG Codec                   |       |          |          |          |          |           |          | ❌       |          |          | ❌        |
| H.264 encoder                |       |          |          |          |          |           |          | ❌       |          |          |           |
| Audio Sample Rate Converter  |       |          |          |          |          |           |          |          |          |          | ❌        |
| CORDIC accelerator           |       |          |          |          |          |           |          |          |          |          | ❌        |
| Voice Activity Detection     |       |          |          |          |          |           |          | ❌       |          |          |           |

### Analog

| Driver                    | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ------------------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| ADC                       | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| Analog Voltage Comparator |       |          |          | [❌][5168] [^1] |          | [❌][5423] [^1] | ❌       | ❌       |          |          | ❌        |
| DAC                       | ⚒️   |          |          |          |          |           |          |          | ⚒️      |          | ❌        |
| Temperature sensor        | ⚒️   | ⚒️      | ⚒️      | [❌][5153] [^1] | ⚒️      | [❌][5421] [^1] | ⚒️      | ❌       | ⚒️      | ⚒️      | ❌        |
| Touch                     | ⚒️   |          |          | [❌][5164] [^1] |          |           |          | ❌       | [❌][1905] [^1] | [❌][1905] [^1] | ❌        |

### Timers and motor control

| Driver          | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| --------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| LEDC            | ⚒️   | ⚒️      | ⚒️      | [❌][5161] [^1] | ⚒️      | [❌][5418] [^1] | ⚒️      | ❌       | ⚒️      | ⚒️      | ❌        |
| MCPWM           | ⚒️   |          |          | [❌][5154] [^1] | ⚒️      |           | ⚒️      | ❌       |          | ⚒️      | ❌        |
| PCNT            | ⚒️   |          |          | ⚒️      | ⚒️      |           | ⚒️      | ❌       | ⚒️      | ⚒️      | ❌        |
| RTC Timekeeping | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| SDM             | ⚒️   |          | ⚒️      | ⚒️      | ⚒️      |           | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| SYSTIMER        |       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| Timers          | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |

### Cryptography and security

| Driver                  | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ----------------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| AES                     | ⚒️   |          | ⚒️      | ⚒️      | ⚒️      |           | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| RSA Digital Signature   |       |          | [❌][884] [^1] | [❌][884] [^1] | [❌][884] [^1] |           | [❌][884] [^1] | ❌       | [❌][884] [^1] | [❌][884] [^1] | ❌        |
| ECDSA Digital Signature |       |          |          | [❌][5444] [^1] |          | [❌][5444] [^1] | [❌][5444] [^1] | ❌       |          |          | ❌        |
| ECC                     |       | ⚒️      |          | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      |          |          | [⚒️][5972] [^1] |
| HMAC                    |       |          | ⚒️      | [❌][5166] [^1] | ⚒️      |           | ⚒️      | ❌       | ⚒️      | ⚒️      | ❌        |
| Key Manager             |       |          |          | [❌][5171] [^1] |          |           |          | ❌       |          |          | ❌        |
| RNG                     | [⚒️][5979] [^1] | [⚒️][5979] [^1] | [⚒️][5979] [^1] | [⚒️][5980] [^1] | [⚒️][5979] [^1] | [⚒️][5981] [^1] | [⚒️][5979] [^1] | [⚒️][5982] [^1] | [⚒️][5979] [^1] | [⚒️][5979] [^1] | [⚒️][5977] [^1] |
| RSA                     | ⚒️   |          | ⚒️      | ⚒️      | ⚒️      |           | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| SHA                     | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | [⚒️][5973] [^1] |

### Low power

| Driver           | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ---------------- |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| Light/deep sleep | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ❌        |
| ULP (FSM)        | [❌][376] [^1] |          |          |          |          |           |          |          | [❌][376] [^1] | [❌][376] [^1] |           |
| ULP (RISC-V)     |       |          |          | [❌][5160] [^1] | ⚒️      |           |          | ❌       | ⚒️      | ⚒️      | ❌        |

### System

| Driver       | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C5 | ESP32-C6 | ESP32-C61 | ESP32-H2 | ESP32-P4 | ESP32-S2 | ESP32-S3 | ESP32-S31 |
| ------------ |:-----:|:--------:|:--------:|:--------:|:--------:|:---------:|:--------:|:--------:|:--------:|:--------:|:---------:|
| ASSIST_DEBUG |       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ❌       |          | ⚒️      | ❌        |
| DMA          | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| ETM          |       |          |          | [❌][5167] [^1] | ⚒️      | [❌][5419] [^1] | ⚒️      | ❌       |          |          | ❌        |
| Interrupts   | ⚒️   | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       | ⚒️      | ⚒️      | ⚒️      | ⚒️      | ⚒️       |
| PSRAM        | ⚒️   |          |          | ⚒️      |          | ⚒️       |          | ⚒️      | ⚒️      | ⚒️      | ⚒️       |

[^1]: This cell is clickable and will open the peripheral's issue on GitHub

[376]: https://github.com/esp-rs/esp-hal/issues/376
[884]: https://github.com/esp-rs/esp-hal/issues/884
[1905]: https://github.com/esp-rs/esp-hal/issues/1905
[1909]: https://github.com/esp-rs/esp-hal/issues/1909
[5153]: https://github.com/esp-rs/esp-hal/issues/5153
[5154]: https://github.com/esp-rs/esp-hal/issues/5154
[5155]: https://github.com/esp-rs/esp-hal/issues/5155
[5160]: https://github.com/esp-rs/esp-hal/issues/5160
[5161]: https://github.com/esp-rs/esp-hal/issues/5161
[5163]: https://github.com/esp-rs/esp-hal/issues/5163
[5164]: https://github.com/esp-rs/esp-hal/issues/5164
[5166]: https://github.com/esp-rs/esp-hal/issues/5166
[5167]: https://github.com/esp-rs/esp-hal/issues/5167
[5168]: https://github.com/esp-rs/esp-hal/issues/5168
[5169]: https://github.com/esp-rs/esp-hal/issues/5169
[5170]: https://github.com/esp-rs/esp-hal/issues/5170
[5171]: https://github.com/esp-rs/esp-hal/issues/5171
[5374]: https://github.com/esp-rs/esp-hal/issues/5374
[5417]: https://github.com/esp-rs/esp-hal/issues/5417
[5418]: https://github.com/esp-rs/esp-hal/issues/5418
[5419]: https://github.com/esp-rs/esp-hal/issues/5419
[5421]: https://github.com/esp-rs/esp-hal/issues/5421
[5423]: https://github.com/esp-rs/esp-hal/issues/5423
[5444]: https://github.com/esp-rs/esp-hal/issues/5444
[5972]: https://github.com/esp-rs/esp-hal/issues/5972
[5973]: https://github.com/esp-rs/esp-hal/issues/5973
[5977]: https://github.com/esp-rs/esp-hal/issues/5977
[5979]: https://github.com/esp-rs/esp-hal/issues/5979
[5980]: https://github.com/esp-rs/esp-hal/issues/5980
[5981]: https://github.com/esp-rs/esp-hal/issues/5981
[5982]: https://github.com/esp-rs/esp-hal/issues/5982
[6138]: https://github.com/esp-rs/esp-hal/issues/6138
<!-- end chip support table -->

## `unstable` feature

The stable feature set is designed to remain consistent and reliable. Other parts guarded by the `unstable` feature, however, are still under active development and may undergo breaking changes and are disabled by default.

## Minimum Supported Rust Version (MSRV)

This crate is guaranteed to compile when using the latest stable Rust version at the time of the crate's release. It _might_ compile with older versions, but that may change in any new release, including patches.

## License

Licensed under either of:

- Apache License, Version 2.0 ([LICENSE-APACHE](../LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](../LICENSE-MIT) or http://opensource.org/licenses/MIT)

at your option.

### Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in
the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without
any additional terms or conditions.