features.yaml

%YAML 1.2
---
# This files is the source of truth what features (as build system entities)
# exist in RIOT. The file `makefiles/features_existing.inc.mk` is generated
# from this list, and so is the documentation in
# `doc/doxygen/src/feature_list.md`. To regenerate them, run
# `make generate-features` in the root of the repo.
#
# The syntax is relatively simple: A group is a mapping that may contain a
# string-valued "title" and "help", may contain a list of groups under the
# "groups" key, and a list of features under the "features" key, where a
# feature is expressed as a mapping that contains a "name" and a "help" string.
# The syntax is formally described in dist/tools/features_yaml2mx/schema.cddl.
#
# Note: The syntax or even the file format will likely change and evolve over
#       time.
groups:
- title: Architecture Features
  help: These indicate architecture features, such as word size of the CPU,
        supported instruction sets and so on. All architecture features provided
        by a given board will always be used, e.g. an 8-bit CPU cannot just stop
        being an 8-bit CPU on request.
  groups:
  - title: Word size
    help: Word size of the CPU
    features:
    - name: arch_8bit
      help: CPU has a 8-bits architecture
    - name: arch_16bit
      help: CPU has a 16-bits architecture
    - name: arch_32bit
      help: CPU has a 32-bits architecture
    - name: arch_64bit
      help: CPU has a 64-bits architecture
  - title: Architecture grouping
    help: Instruction set of the CPU
    features:
    - name: arch_arm
      help: CPU architecture is classic ARM or Cortex M
    - name: arch_arm7
      help: CPU architecture is classic ARM (ARM7)
    - name: arch_avr8
      help: CPU architecture is AVR-8
    - name: arch_efm32
      help: FIXME. This is not an architecture. Use cpu_efm32 for this
    - name: arch_esp
      help: "CPU architecture is an ESP. (Fixme: This is not an architecture)"
    - name: arch_esp_xtensa
      help: CPU architecture is Xtensa
    - name: arch_esp_riscv
      help: CPU architecture is RISC-V (ESP flavor)
    - name: arch_esp32
      help: "CPU architecture is an ESP32. (Fixme: This is not an architecture)"
    - name: arch_esp32_xtensa
      help: CPU architecture is Xtensa (ESP32 flavor)
    - name: arch_esp8266
      help: CPU architecture is Xtensa (ESP8266 flavor)
    - name: arch_msp430
      help: CPU architecture is MSP430
    - name: arch_native
      help: CPU architecture is `native`
    - name: arch_riscv
      help: CPU architecture is RISC-V
    - name: arch_nuclei
      help: The CPU is based on a Nuclei System Technology design. Hence, RIOT is
            using the Nuclei Microcontroller Software Interface Standard
            (NMSIS) vendor independent hardware abstraction layer.

- title: CPU Features
  help: These features are related to CPU capabilities or just used to
        indicated which CPU family is used.
  groups:
  - title: CPU Capabilities
    help: These correspond to features/capabilities provided by certain CPUs
    groups:
    - title: Cortex M Specific Features
      help: These features are only available on (some) ARM Cortex M MCUs
      features:
      - name: cpu_check_address
        help: The @ref cpu_check_address can be used to check if
              accessing a given address would cause a bus fault.
      - name: cortexm_stack_limit
        help: ARM Cortex-M PSPLIM/MSPLIM registers are available.
      - name: cortexm_svc
        help: ARM Cortex-M Supervisor Calls are available.
      - name: cortexm_fpu
        help: A hardware floating point unit is available.
      - name: cortexm_mpu
        help: A memory protection unit (MPU) is available.
      groups:
      - title: nRF Capabilities
        help: These features are only available on (some) nordic nRF MCUs
        features:
        - name: vdd_lc_filter_reg1
          help: An LC filter for use with the internal DC/DC converter is
                present. If this is the case, the DC/DC converter is used over the
                LDO regulator for improved power efficiency.
        - name: vdd_lc_filter_reg0
          help: The MCU supports a high voltage supply via an two-stage regulator
                and the board has an LC filter required for using the two-stage
                DC/DC converter. This enables the two-stage DC/DC converter.
    - title: AVR-8 Specific Features
      groups:
      - title: ATmega Specific Features
        help: These features are only available on (some) ATmega MCUs.
        features:
        - name: atmega_pcint0
          help: Required pin-mapping for pin change interrupt on bank 0 is available.
                See section on pin change interrupts in @ref cpu_atmega_common
        - name: atmega_pcint1
          help: Required pin-mapping for pin change interrupt on bank 1 is available.
                See section on pin change interrupts in @ref cpu_atmega_common
        - name: atmega_pcint2
          help: Required pin-mapping for pin change interrupt on bank 2 is available.
            See section on pin change interrupts in @ref cpu_atmega_common
        - name: atmega_pcint3
          help: Required pin-mapping for pin change interrupt on bank 3 is available.
                See section on pin change interrupts in @ref cpu_atmega_common
      - title: ATxmega Specific Features
        help: These features are only available on (some) ATxmega MCUs.
        features:
        - name: atxmega_ebi
          help: MCU supports the external bus interface (EBI) to either extend
                RAM with external RAM or attach memory mapped peripherals such
                as (some) displays.
    - title: EFM32 Specific Features
      features:
      - name: efm32_coretemp
        help: Y R U not using `periph_temperature` for this?
      - name: gecko_sdk_librail_nonfpu
        help: The CPU offers librail support if the FPU is disabled.
              Librail is shipped as pre-compiled blobs. Thus, we have to adapt to
              their choice how to process floats.
      - name: gecko_sdk_librail_fpu
        help: The CPU offers librail support if the FPU is enabled.
              Librail is shipped as pre-compiled blobs. Thus, we have to adapt to
              their choice how to process floats.
    - title: ESP Specific Features
      help: These features are only available on (some) ESP MCUs.
      features:
      - name: esp_jtag
        help: The MCU supports JTAG for programming and debugging. Enable this
              feature to expose the interface at the cost of having fewer pins as
              GPIOs available.
      - name: esp_now
        help: An ESP NOW-compatible radio is present.
      - name: esp_spiffs
        help: A Serial Peripheral Interface Flash File System can be used.
      - name: esp_wifi
        help: An ESP WiFi radio is present.
      - name: esp_wifi_ap
        help: ESP WiFi SoftAP support is present.
      - name: esp_wifi_enterprise
        help: The ESP WiFi interface supports WPA2 enterprise mode.
      - name: esp_ble_esp32
        help: The ESP32x SoC uses the SDK Bluetooth LE library for the ESP32
              variant.
      - name: esp_ble_esp32c3
        help: The ESP32x SoC uses the SDK Bluetooth LE library for the ESP32-C3 or
              ESP32-S3 variant.
      - name: esp_hw_counter
        help: The used ESP32x SoC supports HW counters that can be used as timers.
      - name: esp_rmt
        help: The ESP32x SoC has an RMT (Remote Control Transceiver) peripheral.
      - name: esp_rtc_timer_32k
        help: An external 32.768 kHz crystal is connected to the ESP32x Soc on the
              board.
      - name: esp_spi_ram
        help: An external RAM is connected via the SPI interface to
              the ESP32x SoC on the board.
      - name: esp_spi_oct
        help: Octal SPI mode is used for Flash and SPI RAM. In this
              case additional GPIOs are used for the SPI interface and cannot be
              used for other purposes.
      - name: esp_ble
        help: An ESP32 Bluetooth LE transceiver is present.
    - title: nordic nRF Specific Features
      features:
      - name: radio_nrf802154
        help: An nRF MCU with a peripheral radio that supports IEEE 802.15.4 is
              present.
      - name: radio_nrfble
        help: An nRF MCU with a peripheral radio that supports Bluetooth LE is
              present.
      - name: radio_nrfmin
        help: An nRF MCU with a peripheral radio that supports nordics proprietary
              link layer protocol is present.

  - title: CPU Grouping
    help: These are not actually features/capabilities, but just indicate to
          which CPU family a certain CPU belongs
    features:
    - name: cpu_native
      help: The board is simulated by a native program running on the host

    groups:
    - title: Atmel / Microchip AVR-8 Grouping
      groups:
      - title: ATmega Grouping
        features:
        - name: cpu_core_atmega
          help: The MCU has an ATmega CPU
        - name: cpu_atmega8
          help: The MCU is an ATmega8
        - name: cpu_atmega32u4
          help: The MCU is an ATmega32U4
        - name: cpu_atmega128rfa1
          help: The MCU is an ATmega128RFA1
        - name: cpu_atmega256rfr2
          help: The MCU is an ATmega256RFR2
        - name: cpu_atmega328p
          help: The MCU is an ATmega328P
        - name: cpu_atmega1281
          help: The MCU is an ATmega1281
        - name: cpu_atmega1284p
          help: The MCU is an ATmega1284P
        - name: cpu_atmega2560
          help: The MCU is an ATmega2560
      - title: ATxmega Grouping
        features:
        - name: cpu_core_atxmega
          help: The MCU has an ATxmega CPU
        - name: cpu_atxmega
          help: The MCU is an ATxmega XYZ CPU
    - title: ARM Cortex-M and Classic ARM Grouping
      features:
      - name: cpu_core_cortexm
        help: The MCU has an ARM Cortex-M CPU (any family)
      - name: cpu_stm32
        help: The MCU has an STM32 MCU

      groups:
      - title: Atmel / Microchip SAM Grouping
        groups:
        - title: SAM0 Grouping
          features:
          - name: cpu_samd21
            help: The MCU has an Atmel/Microchip SAM D10/D11/D20/D21 CPU
          - name: cpu_samd5x
            help: The MCU has an Atmel/Microchip SAM D5x CPU
          - name: cpu_saml1x
            help: The MCU has an Atmel/Microchip SAM L1x CPU
          - name: cpu_saml21
            help: The MCU has an Atmel/Microchip SAM L2x / L3x CPU
        - title: SAM3 Grouping
          features:
          - name: cpu_sam3
            help: The MCU has an Atmel/Microchip SAM 3 CPU

      - title: GigaDevice Semiconductor Inc Grouping
        features:
        - name: cpu_gd32v
          help: The MCU is part of the GigaDevice GD32V family

      - title: nordic nRF Grouping
        features:
        - name: cpu_nrf51
          help: The MCU has an nordic nRF51 CPU
        - name: cpu_nrf52
          help: The MCU has an nordic nRF52 CPU
        - name: cpu_nrf53
          help: The MCU has an nordic nRF53 CPU
        - name: cpu_nrf9160
          help: The MCU has an nordic nRF9160 CPU

      - title: NXP Grouping
        features:
        - name: cpu_kinetis
          help: The MCU is part of the NXP Kinetis family
        - name: cpu_lpc1768
          help: The MCU is an NXP LPC1768
        - name: cpu_lpc23xx
          help: The MCU is part of the NXP LPC23xx classic ARM family
        - name: cpu_qn908x
          help: The MCU is part of the NXP QN908x family

      - title: Nintendo Grouping
        features:
        - name: cpu_arm7tdmi_gba
          help: The MCU of the Game Boy Advance.

      - title: Raspberry Pi Grouping
        features:
        - name: cpu_rpx0xx
          help: The MCU is part of the Raspberry PI RPx0xx family.

      - title: Silicon Laboratories EFM32 Grouping
        features:
        - name: cpu_efm32
          help: The MCU is part of the Silicon Labs EFM32 family

      - title: SiFive, Inc. Grouping
        features:
        - name: cpu_fe310
          help: The MCU is in SiFive Freedom E310

      - title: STMicroelectronics STM32 Grouping
        features:
        - name: cpu_stm32c0
          help: The MCU has an STM32 C0 MCU
        - name: cpu_stm32f0
          help: The MCU has an STM32 F0 MCU
        - name: cpu_stm32f1
          help: The MCU has an STM32 F1 MCU
        - name: cpu_stm32f2
          help: The MCU has an STM32 F2 MCU
        - name: cpu_stm32f3
          help: The MCU has an STM32 F3 MCU
        - name: cpu_stm32f4
          help: The MCU has an STM32 F4 MCU
        - name: cpu_stm32f7
          help: The MCU has an STM32 F7 MCU
        - name: cpu_stm32g0
          help: The MCU has an STM32 G0 MCU
        - name: cpu_stm32g4
          help: The MCU has an STM32 G4 MCU
        - name: cpu_stm32l0
          help: The MCU has an STM32 L0 MCU
        - name: cpu_stm32l1
          help: The MCU has an STM32 L1 MCU
        - name: cpu_stm32l4
          help: The MCU has an STM32 L4 MCU
        - name: cpu_stm32l5
          help: The MCU has an STM32 L5 MCU
        - name: cpu_stm32mp1
          help: The MCU has an STM32 MP1 MCU
        - name: cpu_stm32u5
          help: The MCU has an STM32 U5 MCU
        - name: cpu_stm32wb
          help: The MCU has an STM32 WB MCU
        - name: cpu_stm32wl
          help: The MCU has an STM32 WL MCU

      - title: Texas Instruments ARM MCU Grouping
        features:
        - name: cpu_cc26x2_cc13x2
          help: The CPU in an TI CC26x2 or an TI CC13x2
        - name: cpu_cc26x0_cc13x0
          help: The CPU in an TI CC26x0 or an TI CC13x0
        - name: cpu_cc2538
          help: The CPU in an TI CC2538
        - name: cpu_lm4f120
          help: The CPU is an TI LM4F120

    - title: Expressif ESP Grouping
      features:
      - name: cpu_esp32
        help: The MCU is part of the ESP32 family
      - name: cpu_esp8266
        help: The MCU is an ESP8266

    - title: Texas Instruments MSP430 MCU Grouping
      features:
      - name: cpu_msp430
        help: The MCU is member of the MSP430 family.
      - name: cpu_msp430_x1xx
        help: The MCU is member of the MSP430 x1xx family.
      - name: cpu_msp430_f2xx_g2xx
        help: The MCU is member of the MSP430 F2xx/G2xx family.

- title: Arduino Features
  help: These features indicate that an Arduino style I/O mapping is available,
        in which common descriptors refer to a GPIO pin / I²C bus / SPI bus /
        PWM output / ADC input / etc. at a well-known location on a well-known
        board form factor.
  groups:
  - title: Arduino I/O Mapping Features
    help: These features indicate presence of I/O mappings (e.g. well-known
          preprocessor macro names such as `ARDUINO_PIN_0` for a GPIO pin that
          is routed to pin `D0` on the board.
    features:
    - name: arduino_analog
      help: Indicates that Arduino analog pins mappings are provided.
    - name: arduino_dac
      help: Indicates that Arduino DAC pins mappings are provided.
    - name: arduino_i2c
      help: Indicates that Arduino I²C bus mappings are provided.
    - name: arduino_pins
      help: Indicates that Arduino digital pins mappings are provided.
    - name: arduino_pwm
      help: Indicates that Arduino digital pin to PWM mappings are provided.
    - name: arduino_spi
      help: Indicates that Arduino SPI bus mappings are provided.
    - name: arduino_uart
      help: Indicates that Arduino UART device mappings are provided.
  - title: Arduino Form Factor Features
    help: These features indicate compatibility with a specific form factor,
          e.g. Arduino UNO or Adafruit Feather
    features:
    - name: arduino_shield_isp
      help: Indicates that the board is mechanically and electrically compatible
            with shields that mate with the ISP header for SPI connectivity.
    - name: arduino_shield_mega
      help: >
            Indicates that the board is mechanically and electrically compatible
            with shields developed for the Arduino Mega 2560. (Note: Except
            the ISP header, that requires `arduino_shield_isp` in addition.)
    - name: arduino_shield_nano
      help: >
            Indicates that the board is mechanically and electrically compatible
            with shields developed for the Arduino Nano. (Note: Except the
            ISP header, that requires `arduino_shield_isp` in addition.)
    - name: arduino_shield_uno
      help: >
            Indicates that the board is mechanically and electrically compatible
            with shields developed for the Arduino Nano. (Note: Except the
            ISP header, that requires `arduino_shield_isp` in addition.)

- title: RAM Related Features
  help: These features indicate presence of special RAM regions or features
  features:
  - name: backup_ram
    help: A special portion of RAM is retained during deep sleep.
          Variables can be placed there by annotating them with the `BACKUP_RAM`
          attribute.
  - name: periph_rtc_mem
    help: The RTC peripheral provides storage memory for deep sleep. Unlike
          `backup_ram`, this memory is not mapped in the address space and requires
          calls to @ref rtc_mem_read and @ref rtc_mem_write to access.
  - name: puf_sram
    help: The @ref sys_puf_sram module can be used to harvest entropy from
          uninitialized SRAM on cold boot to seed PRNGs.

- title: Bluetooth Low Energy Features
  help: The capabilities of the integrated (peripheral) BLE transceiver are
        modules using these features.
  features:
  - name: ble_adv_ext
    help: Support for Bluetooth LE 5 Advertising Extension
  - name: ble_nimble
    help: Support for the NimBLE stack
  - name: ble_nimble_netif
    help: NimBLE supports the netif API, so that network stacks such as GNRC can
          be used on top. See @ref pkg_nimble_netif for details.
  - name: ble_phy_2mbit
    help: The BLE radio supports the 2Mbit PHY mode
  - name: ble_phy_coded
    help: The BLE radio supports the CODED PHY mode

- title: Toolchain Features
  help: These features are used to indicate which toolchains are supported,
        which languages they support, which libraries (e.g. picolibc, newlibc,
        libstdc++, etc.) are supported. Unless using `BUILD_IN_DOCKER=1`, those
        toolchains/libraries need to be installed on the system for the given
        platform to actually be usable, though.
  features:
  - name: cpp
    help: The C++ programming language is supported. Note that libstdc++ support
          is not implied and indicated by a separate feature.
  - name: libstdcpp
    help: When using C++, a libstdc++ is available.
  - name: picolibc
    help: The picolibc C library is available for the platform.
  - name: newlib
    help: The newlib C library is available for the platform.
  - name: rust_target
    help: The Rust target definition ("triple") is known. This is
          a mandatory requirement to build Rust code.
  - name: emulator_renode
    help: The platform is compatible with the Renode emulator.

- title: Peripheral Features
  help: These features indicate presence of peripheral IP block, presence of
        a corresponding driver in RIOT, and any required board specific
        configuration needed.
  features:
  - name: periph_cpuid
    help: The CPU has identification information available. In the best case this
          is a globally unique ID, in the worst case it is some calibration
          parameters to compensate production variance that may or may not allow
          telling the CPU apart from any given other.
  - name: periph_pwm
    help: A Pulse-Width Modulation (PWM) peripheral is present.
  - name: periph_qdec
    help: A Quadrature Decoder (QDEC) peripheral is present.
  - name: periph_temperature
    help: The MCU has a built-in temperature sensor.
  - name: periph_vbat
    help: Backup battery monitoring is supported
  - name: periph_freqm
    help: A Frequency Meter peripheral is present.
  - name: periph_dma
    help: A DMA peripheral is present. Enabling this feature affects the
          implementation of other peripheral drivers. E.g. SPI/I²C/UART/...
          transfers may use the DMA (possible only when transfers are longer than
          a certain cut-off). The main benefit is that other threads can run
          while the thread issuing the, say SPI transfer, is blocked until the
          transfer is completed. It often also speeds up longer transfers.
  - name: periph_pm
    help: The MCU supports power management (PM) and RIOT can make use of that.
  - name: periph_ltdc
    help: An LCD/TFT Display Controller (LTDC) peripheral is present. (Currently
          only provided by some STM32 MCUs.)
  - name: periph_pio
    help: A Programmable IO (PIO) is present. (Currently only RP2040)

  groups:
  - title: General-Purpose Input/Output (GPIO)
    features:
    - name: periph_gpio_fast_read
      help: This feature is currently available on Microchip SAM0 based MCUs only.
            Enabling this feature reduces read latency for an increase in power
            consumption. It affects both the classic GPIO API driver and the
            GPIO LL driver.

    groups:
    - title: Pin Level Peripheral GPIO API
      help: This is a pin-level API that caters most use cases. Most code
            should be using this API over GPIO LL.
      features:
      - name: periph_gpio
        help: The classic GPIO API is implemented
      - name: periph_gpio_irq
        help: The classic GPIO driver supports external interrupts.
      - name: periph_gpio_tamper_wake
        help: This features is currently available on Microchip SAMD5x MCUs only.
              Enabling this features allows GPIO IRQs to wake the CPU even in
              deep sleep. The SAMD5x is not the only MCU that can be woken from
              lower power modes via GPIO, but it is currently the only MCU were
              this feature is configurable.

    - title: GPIO LL API
      help: This is a lower level GPIO API that allows port based access. It
            exposes a number of advanced features and lower latency GPIO
            access at the cost of a more complex and more frequently
            changing API. You should only use this if the Pin Level Peripheral
            GPIO API is not catering your use case well enough.
      features:
      - name: periph_gpio_ll
        help: The GPIO LL driver is implemented for the MCU's GPIO peripheral.
      - name: periph_gpio_ll_irq
        help: The GPIO LL driver has IRQ support.
      - name: periph_gpio_ll_irq_level_triggered_high
        help: Level triggered IRQs are supported for level high.
      - name: periph_gpio_ll_irq_level_triggered_low
        help: Level triggered IRQs are supported for level low.
      - name: periph_gpio_ll_irq_unmask
        help: The GPIO LL driver supports unmasking interrupts without
              clearing pending IRQs that came in while masked.
      - name: periph_gpio_ll_disconnect
        help: Some or all GPIO pins can be electrically disconnected from the MCU
              (high impedance state) with the GPIO LL API.
      - name: periph_gpio_ll_input_pull_down
        help: Some or all GPIO pins can enable an internal pull down resistor when
              the GPIO is configured in input mode.
      - name: periph_gpio_ll_input_pull_keep
        help: Some or all GPIO pins can enable internal pull resistors that pull
              towards the current bus level (pull down when bus is low, pull up
              when bus is high).
      - name: periph_gpio_ll_input_pull_up
        help: Some or all GPIO pins can enable an internal pull up resistor when
              the GPIO is configured in input mode.
      - name: periph_gpio_ll_open_drain
        help: Some or all pins can be configured in open drain mode.
      - name: periph_gpio_ll_open_drain_pull_up
        help: Some or all GPIO pins can enable an internal pull up resistor when
              the GPIO is configured in open drain mode.
      - name: periph_gpio_ll_open_source
        help: Some or all pins can be configured in open source mode.
      - name: periph_gpio_ll_open_source_pull_down
        help: Some or all GPIO pins can enable an internal pull down resistor when
              the GPIO is configured in open source mode.
      - name: periph_gpio_ll_switch_dir
        help: The GPIO LL driver allows switching the direction between input
              and (push-pull) output in an efficient manner. The main use case
              is bit-banging bidirectional protocols when open-drain / open-source
              mode is not supported. GPIO LL drivers for peripherals that do
              support open drain mode typically do not bother implementing this,
              even if the hardware would allow it.

  - title: Serial Interfaces
    help: Features related to serial interfaces

    groups:
    - title: UART Features
      help: Features related to the Universal Asynchronous Receiver-Transmitter
            peripheral
      features:
      - name: periph_uart
        help: An UART peripheral is present.
      - name: periph_lpuart
        help: A low-power UART peripheral is present.
      - name: periph_uart_collision
        help: The UART peripheral supports hardware collision detection.
      - name: periph_uart_hw_fc
        help: The UART peripheral supports hardware flow control.
      - name: periph_uart_modecfg
        help: The UART peripheral allows configuration to non-default modes.
      - name: periph_uart_tx_ondemand
        help: Indicates that the UART peripheral can enable / disable the TX line
              using @ref uart_enable_tx / @ref uart_disable_tx
      - name: periph_uart_nonblocking
        help: The UART peripheral allows non-blocking operations.
      - name: periph_uart_reconfigure
        help: The UART pins can be made available as regular GPIOS using
              @ref uart_deinit_pins and be attached back to the UART peripheral using
              @ref uart_init_pins
      - name: periph_uart_rxstart_irq
        help: The UART can issue an interrupt when the start condition detected.
              Use @ref uart_rxstart_irq_configure to associate a callback with the
              ISR of a given UART peripheral.

    - title: SPI Features
      help: Features related to the Serial Peripheral Interface peripheral
      features:
      - name: periph_spi
        help: An SPI peripheral is present.
      - name: periph_spi_on_qspi
        help: The QSPI peripheral can be used in SPI mode.
      - name: periph_spi_reconfigure
        help: The SPI pins can be made available as regular GPIOs using
              @ref spi_deinit_pins and re-attached to the SPI peripheral using
              @ref spi_init_pins
      - name: periph_spi_gpio_mode
        help: The SPI peripheral supports specifying the GPIO mode of each SPI
              pin upon initialization of the peripheral.

    - title: I²C Features
      help: Features related to the Inter-Integrated Circuit peripheral
      features:
      - name: periph_i2c
        help: An I²C peripheral is present.
      - name: pio_i2c
        help: An I²C bus can be provided via the PIO peripheral.
      - name: periph_i2c_reconfigure
        help: The I²C pins can be made available as regular GPIOs using
              @ref i2c_deinit_pins and re-attached to the I²C peripheral using
              @ref i2c_init_pins

    - title: USB Features
      help: Features related to the Universal Serial Bus
      features:
      - name: periph_usbdev
        help: An USB peripheral is present.
      - name: periph_usbdev_hs
        help: The USB peripheral supports High-Speed.
      - name: periph_usbdev_hs_utmi
        help: An USB high-speed peripheral with internal UTMI+ HS PHY is present.
      - name: periph_usbdev_hs_ulpi
        help: An USB high-speed peripheral with ULPI HS PHY is present.

  - title: Analog Features
    help: Features related to ADCs/DACs
    features:
    - name: periph_adc
      help: An ADC peripheral is present.
    - name: periph_adc_continuous
      help: The ADC peripheral can be left on between measurements.
    - name: periph_dac
      help: A DAC peripheral is present.

  - title: Integrated Connectivity
    help: Peripheral network and communication interfaces.
    features:
    - name: periph_can
      help: A CAN peripheral is present.
    - name: can_rx_mailbox
      help: CAN controller RX mailbox is supported
    - name: periph_eth
      help: An Ethernet peripheral is present.

  - title: SD / MMC Card Features
    features:
    - name: periph_sdmmc
      help: An SDIO/SD/MMC peripheral is present and used by the board. This feature
            shall be provided by the board configuration, if available.
    - name: periph_sdmmc_8bit
      help: The SDIO/SD/MMC peripheral supports the 8-bit bus width and at least one
            component of the board is connected with 8 data lines. This feature
            shall be provided by the board configuration, if available.
    - name: periph_sdmmc_auto_clk
      help: The SDIO/SD/MMC peripheral supports the Auto-CLK feature, i.e. the
            automatic activation and deactivation of the SD CLK signal when
            required. This feature shall be provided by the MCU if supported.
    - name: periph_sdmmc_auto_cmd12
      help: The SDIO/SD/MMC peripheral supports the Auto-CMD12 feature, i.e. CMD12 is
            sent automatically to stop the transmission in multiple block operations.
            This feature shall be provided by the MCU if supported.
    - name: periph_sdmmc_clk
      help: The SDIO/SD/MMC peripheral has special clock functionality used by the
            peripheral driver.
    - name: periph_sdmmc_hs
      help: The SDIO/SD/MMC peripheral supports the high speed access, that is
            50 MHz for SD and 52 MHz for MMC. This feature shall be provided by the
            MCU.
    - name: periph_sdmmc_mmc
      help: The SDIO/SD/MMC peripheral supports MMC/eMMCs. This feature shall be
            provided by the MCU.
    - name: periph_sdmmc_sdhc
      help: The SDIO/SD/MMC peripheral is compliant with the SD Host Controller
            Specification. This feature shall be provided by the MCU.

  - title: Flash Features
    features:
    - name: periph_flashpage
      help: A Flashpage peripheral is present.
    - name: periph_flashpage_in_address_space
      help: Static memory sections can fundamentally be turned into flash pages.
    - name: periph_flashpage_pagewise
      help: The Flashpage peripheral supports pagewise writing.
    - name: periph_flashpage_rwee
      help: The Flashpage peripheral is of the Read While Write.
    - name: periph_flashpage_aux
      help: It is possible to partition off a part of the internal flash for an
            auxiliary slot.

  - title: Other Peripheral Storage Features
    features:
    - name: periph_eeprom
      help: An EEPROM peripheral is present.
    - name: periph_fmc
      help: An Flexible Memory Controller (FMC) or an Flexible Static Memory
            Controller (FSMC) is present. It can be used to extend memory or
            drive display controllers.
    - name: periph_fmc_16bit
      help: The FMC/FSMC peripheral supports a 16-bit data bus
    - name: periph_fmc_32bit
      help: The FMC/FSMC peripheral supports a 32-bit data bus
    - name: periph_fmc_sdram
      help: A board configuration is provided to attach map the board's SDRAM into
            the address space using the FMC/FSMC.
    - name: periph_fmc_nor_sram
      help: A board configuration is provided to attach map the board's NOR flash
            or (P)SRAM into the address space using the FMC/FSMC.
    - name: periph_nvm
      help: A non-volatile memory peripheral is present. This is currently
            only provided by ATxmega MCUs to read the production signature which
            then is used as CPU ID.

  - title: Timer Features
    help: Features related to timers
    features:
    - name: periph_rtc
      help: An Real Time Clock (RTC) peripheral is present. This timer works with
            time broken down into year, month, day, hour, minute, second.
    - name: periph_rtc_ms
      help: The RTC peripheral can provide sub-second timestamps.
    - name: periph_rtt
      help: An Real Time Timer (RTT) (a.k.a. Real Time Counter) peripheral is
            present. This timer is similar to `periph_timer`, except for using
            a different API (for no reason), being low power, slower ticking,
            and typically less affected by clock drift.
    - name: periph_rtt_set_counter
      help: The RTT peripheral implements @ref rtt_set_counter
    - name: periph_rtt_overflow
      help: The RTT provides an overflow callback.
    - name: periph_wdt
      help: A Watchdog Timer (WDT) peripheral is present.
    - name: periph_wdt_cb
      help: The WDT peripheral allows setting a callback function to be called
            before the reboot is actually triggered.
    - name: periph_wdt_warning_period
      help: By setting @ref CONFIG_WDT_WARNING_PERIOD the time when the WDT callback
            is triggered can be set. It specifies how many milliseconds before the
            reboot the callback should be executed.

    groups:
    - title: High Frequency Timers
      help: Features related to high frequency timers, a.k.a. `periph_timer`
      features:
      - name: periph_timer
        help: A high frequency timer peripheral is present.
      - name: periph_timer_periodic
        help: The Timer peripheral allows setting periodic timeouts in addition to
              the mandatory one-shot timeouts.
      - name: periph_timer_poll
        help: The Timer peripheral allows polling if a one-shot timer channel has
              already been expired using @ref timer_poll_channel to allow high
              accuracy busy waiting.
      - name: periph_timer_query_freqs
        help: The timer driver supports querying supported frequencies.

    - title: PTP Timers
      help: These features are related to the hardware requirements to implement
            the Precision Time Protocol.
      features:
      - name: periph_ptp
        help: A PTP clock is present. The clock must have nanoseconds as unit and be
              at least 64 bit wide.
      - name: periph_ptp_speed_adjustment
        help: The PTP clock speed can be adjusted. This can be used for clock drift
              correction and synchronization without "jumping" to the new network
              time, but rather pace faster/slow for some time until the clocks are
              back in sync.
      - name: periph_ptp_timer
        help: The PTP clock can be used as timer (so that (absolute) timeouts can
              be set on the clock).
      - name: periph_ptp_txrx_timestamps
        help: The PTP clock can provide exact time stamps of the reception and
              transmission of frames (typically received at the peripheral Ethernet
              interface).

  - title: Platform Specific
    help: Things specific to a single MCU family / MCU vendor
    features:
    - name: periph_ics
      help: An NXP Kinetis Internal Clock Source Controller (ICS peripheral) is
            present.
    - name: periph_mcg
      help: An Kinetis Multipurpose Clock Generator (MCG peripheral) is present.
    - name: periph_mcg_lite
      help: An Kinetis Multipurpose Clock Generator (MCG peripheral) is present in
            the lite version.
    - name: periph_coretimer
      help: A RISC-V CLINT timer is available and usable via the High Speed
            timer API. The CLINT only supports running at the RTC clock, typically
            32.678 kHz, though.
    - name: periph_pmp
      help: A RISC-V physical memory protection (PMP) peripheral is present.
            (Similar to ARM's MPU)
    - name: periph_clic
      help: A RISC-V Core-local Interrupt Controller (CLIC) peripheral is present.
    - name: periph_plic
      help: A RISC-V Platform-local Interrupt Controller (PLIC) peripheral is present.

  - title: Cryptographic Features
    help: Hardware acceleration for cryptographic primitives, hardware random
          number generators, and other features useful for cryptography.

          Please keep in mind that some of the cryptographic primitives provided
          by the hardware have not aged well in terms of security. They may
          still be nifty for use cases other than security, though.
    features:
    - name: periph_cryptocell_310
      help: A cryptocell peripheral is present.
    - name: periph_hash_md5
      help: MD5 hardware acceleration present.
    - name: periph_hash_sha_1
      help: SHA-1 hardware acceleration present.
    - name: periph_hash_sha_224
      help: SHA-224 hardware acceleration present.
    - name: periph_hash_sha_256
      help: SHA-256 hardware acceleration present.
    - name: periph_hash_sha_384
      help: SHA-384 hardware acceleration present.
    - name: periph_hash_sha_512
      help: SHA-512 hardware acceleration present.
    - name: periph_hash_sha_512_224
      help: SHA-512/224 hardware acceleration present.
    - name: periph_hash_sha_512_256
      help: SHA-512/256 hardware acceleration present.
    - name: periph_hmac_sha_256
      help: HMAC SHA-256 hardware acceleration present.
    - name: periph_hwrng
      help: A Hardware Random Number Generator (HWRNG) peripheral is present.
    - name: periph_cipher_aes_128_cbc
      help: AES 128 CBC hardware acceleration present
    - name: periph_ecc_p192r1
      help: ECC P192R1 hardware acceleration peripheral present.
    - name: periph_ecc_p256r1
      help: ECC P256R1 hardware acceleration peripheral present.
    - name: periph_ecc_ed25519
      help: ECC Edwards25519 hardware acceleration peripheral present.

- title: Other Features
  help: Features that did not fit in any category
  features:
  - name: dbgpin
    help: The platform provides the necessary initialization hooks
          for the `dbgpin` module.
  - name: no_idle_thread
    help: The MCU can idle without an idle thread
  - name: riotboot
    help: The `riotboot` bootloader is supported.
  - name: ssp
    help: Stack Smashing Protection is supported.
  - name: tinyusb_device
    help: The TinyUSB network stack is supported and can be selected with
          `USEPKG += tinyusb`.
  - name: bootloader_stm32
    help: The MCU has a STM32 bootloader in ROM that can be used for flashing.

- title: Board Features
  help: These features indicate features of the board
  features:
  - name: netif
    help: The board has a network interface
  - name: netif_ethernet
    help: The board has an Ethernet network interface
  - name: netif_openwsn
    help: The board has a network interface suitable for OpenWSN
  - name: highlevel_stdio
    help: A high-level stdio method (such as CDC ACM) is used. This requires a
          running thread and set-up and will not print during a crash.
  - name: motor_driver
    help: A motor_driver configuration is present.
  - name: sdcard_spi
    help: An SD-Card SPI configuration is provided.

  groups:
  - title: STM32L496G Discovery Board Features
    help: Features available and selectable on the `stm32l496-disco` board only
    features:
    - name: periph_spi_stmod
      help: By default, solder bridges SB6, SB7, SB8 are closed and USART1 is
            connected to the Pmod/STMmod+ connector. If these solder bridges are
            open and solder bridges SB4, SB5 and SB6 are closed instead, SPI2 is
            connected to the STMmod+/Pmod connector. Request this feature to use
            SPI2 with this board configuration.