STM32 Crates

This repository contains device support for all STM32 microcontrollers, providing a safe API to that device using svd2rust and an extensive hierarchy of SVD patches. Each supported device is a feature-gated module in a crate for that device family.

Please note many parts of most libraries will not have been tested on every possible chip yet! While they're all generated from ST-provided SVD files, we can't make any guarantee of correctness. Please report any bugs you find!

You can see current coverage status for each chip here. Coverage means that individual fields are documented with possible values, but even devices with low coverage should have every register and field available in the API. That page also allows you to drill down into each field on each register on each peripheral.

Using Device Crates In Your Own Project

In your own project's Cargo.toml:

[dependencies.stm32f4]
version = "0.9.0"
features = ["stm32f405", "rt"]

The rt feature is optional but helpful. See svd2rust for details.

Then, in your code:

use stm32f4::stm32f405;

let mut peripherals = stm32f405::Peripherals::take().unwrap();

Refer to svd2rust documentation for further usage.

Replace stm32f4 and stm32f405 with your own device; see the individual crate READMEs for the complete list of supported devices. All current STM32 devices should be supported to some level.

Generating Device Crates / Building Locally

• Install svd2rust: cargo install svd2rust
• Install form: cargo install form
• Install rustfmt: rustup component add rustfmt
• Install PyYAML: pip install --user pyyaml
• Unzip bundled SVD zip files: cd svd; ./extract.sh
• Generate patched SVD files: cd ..; make patch
• Generate svd2rust device crates: make svd2rust (you probably want -j for this)
• Optional: Format device crates: make form (you probably want -j for this)

Motivation and Objectives

This project serves two purposes:

• Create a source of high-quality STM32 SVD files, with manufacturer errors and inconsistencies fixed. These files could be used with svd2rust or other tools, or in other projects. They should hopefully be useful in their own right.
• Create and publish svd2rust-generated crates covering all STM32s, using the SVD files.

At present many individual crates exist for specific STM32 devices, typically maintained by many separate users with hand-edited updates to the SVD files. This means that support for less-common STM32s is completely missing, and the hand-edited SVDs may be inconsistent with other crates. Plus, it's a huge duplication of work, since so many peripherals are the same between devices.

This project hopes to reduce the duplication of effort, and hopefully in the future enable further automation / code generation based on automatically identifying similarities between different devices.

Helping

This project is still young and there's a lot to do!

• More peripheral patches need to be written, most of all. See what we've got in peripherals/ and grab a reference manual!
• Also everything needs testing, and you can't so easily automate finding bugs in the SVD files...
• Is this really the best way to support a lot of devices? We end up with a handful of crates, each with a lot of features, and each feature enables a gigantic module, but they all share a lot of code. Can we automatically factor out the shared structures?

Supported Device Families

• STM32F0
• STM32F1
• STM32F2
• STM32F3
• STM32F4
• STM32F7
• STM32L0
• STM32L1
• STM32L4
• STM32H7
• STM32G0
• STM32G4

Please see the individual crate READMEs for the full list of devices each crate supports. All SVDs released by ST for STM32 devices are covered, so probably your device is supported to some extent!

Devices that are nearly identical, like the STM32F405/F415, are supported by ST under a single SVD file STM32F405, so if you can't find your exact device check if its sibling is supported instead.

Many peripherals are not yet patched to provide the type-safe friendly-name interface; please consider helping out with this!

Check out the full list of supported devices here.

Adding New Devices

• Update SVD zips in svd/vendor to include new SVD.
• Run svd/extract.sh to extract the zips into svd (ignored in git).
• Add new YAML file in devices/ with the new SVD path and include any required SVD patches for this device, such as renaming or merging fields.
• You can run scripts/matchperipherals.py script to find out what existing peripherals could be cleanly applied to this new SVD. If they look sensible, you can include them in your device YAML.
• Re-run scripts/makecrates.py devices/ to update the crates with the new devices.
• Run make to rebuild, which will make a patched SVD and then run svd2rust on it to generate the final library.

Updating Existing Devices/Peripherals

• You'll need to run svd/extract.sh at least once to pull the SVDs out.
• Edit the device or peripheral YAML (see below for format).
• Run make to rebuild all the crates using svdpatch.py and svd2rust.
• Test your new stuff compiles: cd stm32f4; cargo build --features stm32f405

If you've added a new peripheral, consider using the matchperipherals.py script to see which devices it would cleanly apply to.

To generate a new peripheral file from scratch, consider using periphtemplate.py, which creates an empty peripheral file based on a single SVD file, with registers and fields ready to be populated. For single bit wide fields with names ending in 'E' or 'D' it additionally generates sample "Enabled"/"Disabled" entries to save time.

Device and Peripheral YAML Format

The patch specifications are in YAML and have the following general format:

# Path to the SVD file we're targeting. Relative to this file.
# This must be included only in the device YAML file.
_svd: "../svd/STM32F0x0.svd"

# Include other YAML files. Path relative to this file.
_include:
    - "../peripherals/gpio_v2.yaml"

# Alter top-level information and peripherals for this device
_modify:
    version: 1.1
    description: bla bla
    addressUnitBits: 8
    width: 32
    cpu:
        revision: r1p2
        mpuPresent: true
    # Peripherals can either live directly at this level (but other top-level
    # fields will name match first)
    C_ADC:
        name: ADC_Common
    # Or they can be inside a _peripherals block, to avoid name conflicts.
    _peripherals:
        FSMC:
            description: Flexible static memory controller

# Add whole new peripherals to this device.
# Incredibly this feature is required.
_add:
    ADC_Common:
        description: ADC Common registers
        groupName: ADC
        baseAddress: 0x40012300
        addressBlock:
            offset: 0x0
            size: 0x400
        registers:
            CSR:
                description: ADC Common status register
                addressOffset: 0x0
                access: read-only
                resetValue: 0x00000000
                fields:
                    OVR3:
                        description: Overrun flag of ADC3
                        bitOffset: 21
                        bitWidth: 1
        interrupts:
            ADC1_2:
                description: ADC global interrupt
                value: 18

# A whole new peripheral can also be created as derivedFrom another peripheral.
_add:
    USART3:
        derivedFrom: USART1
        baseAddress: "0x40004800"
        interrupts:
            USART3:
                description: USART3 global interrupt
                value: 39

# A new peripheral can have all its registers copied from another, in case
# it cannot quite be derivedFrom (e.g. some fields need different enumerated
# values) but it's otherwise almost exactly the same.
# The registers are copied but not name or address or interrupts.
_copy:
    ADC3:
        from: ADC2

# The new peripheral can also be copied from another svd file for a different
# device. This is useful when a peripheral is missing in a device but the exact
# same peripheral already exist in another device.
_copy:
    TIM1:
        from: ../svd/stm32f302.svd:TIM1

# Replace peripheral registers by a 'deriveFrom'.
# This is used when e.g. UART4 and UART5 are both independently defined,
# but you'd like to make UART5 be defined as derivedFrom UART4 instead.
_derive:
    # The KEY peripheral looses all its elements but 'interrupt', 'name',
    # and 'baseAddress', and it is derivedFrom the VALUE peripheral.
    # Peripherals that were 'deriveFrom="KEY"' are now 'deriveFrom="VALUE"'.
    UART5: UART4

# Reorder the hierarchy of peripherals with 'deriveFrom'.
# This is used when e.g. I2C1 is marked as derivedFrom I2C3,
# but you'd like to swap that so that I2C3 becomes derivedFrom I2C1.
_rebase:
    # The KEY peripheral steals everything but 'interrupt', 'name',
    # and 'baseAddress' elements from the VALUE peripheral.
    # Peripherals that were 'deriveFrom="VALUE"' are now 'deriveFrom="KEY"'.
    # The VALUE peripheral is marked as derivedFrom the updated KEY.
    I2C1: I2C3

# An STM32 peripheral, matches an SVD <peripheral> tag.
# Does not match any tag with derivedFrom attribute set.
"GPIO*":
    # We can include other YAML files inside this peripheral
    _include:
        - "path/to/file.yaml"

    # Alter fields on existing registers inside this peripheral
    _modify:
        # Rename this badly named register. Takes effect before anything else.
        # Don't use wildcard matches if you are changing the name!
        # We could have specified name or description or other tags to update.
        GPIOB_OSPEEDR:
          name: OSPEEDR
        # Equivalently the register could go in a '_registers' block
        _registers:
            GPIOB_OSPEEDR:
                name: OSPEEDR
        # Change the value of an interrupt in this peripheral
        _interrupts:
            EXTI0:
                value: 101


    # Add new registers and interrupts to this peripheral.
    # Entries are registers by default, which can also go inside a '_registers'
    # block, or interrupts go in an '_interrupts' block.
    _add:
        EXAMPLER:
            description: An example register
            addressOffset: 0x04
            access: read-write
            fields:
                EXR1:
                    description: Example field
                    bitOffset: 16
                    bitWidth: 4
        _registers:
            EXAMPLR2:
                description: Another example register
        _interrupts:
            EXAMPLEI:
                description: An example interrupt
                value: 100

    # Anywhere you can '_add' something, you can also '_delete' it.
    # Wildcards are supported. The value here can be a YAML list of registers
    # to delete (supported for backwards compatibility), or a YAML mapping
    # of lists of registers or interrupts.
    _delete:
        GPIO*_EXTRAR:
        _registers:
            - GPIO*_EXAMPLER
        _interrupts:
            - USART1

    # If registers have unnecessary common prefix,
    # you can clean it in all registers in peripheral by:
    _strip:
        - PREFIX_

    # You can collect several same registers into one register array
    # that will be represented with svd2rust as array or elements
    # with one type
    # Minimal version:
    _array:
        ARRAY*: {}

    # You can also use the modifiers shown below:
    _array:
        ARRAY*:
            name: NEW_NAME%s
            _modify:
                FIELD: [MINIMUM, MAXIMUM]
                FIELD:
                  description: NEWDESC
        OTHER_ARRAY*: {}

    # If you have registers that make up a group and can be repeated,
    # you can collect them into cluster like this:
    _cluster:
        CLUSTER%s:
            FIRST_REG: {}
            SECOND_REG: {}

    # A register on this peripheral, matches an SVD <register> tag
    MODER:
        # As in the peripheral scope, rename or redescribe a field.
        # Don't use wildcard matches if you are changing the name!
        _modify:
            FIELD:
              description: NEWDESC

        # Add new fields to this register
        _add:
            NEWFIELD:
              description: DESCRIPTION
              bitOffset: 12
              bitWidth: 4
              access: read-write

        # Often fields that should be one contiguous integer are specified
        # as a number of individual bits instead. This merges any matching
        # registers into a single field with the combined bitwidth and lowest
        # bit offset, and the shared description and access.
        _merge:
            - "FIELD*"

        # A field in this register, matches an SVD <field> tag
        FIELD:
            # By giving the field a dictionary we construct an enumerateValues
            VARIANT: [VALUE, DESCRIPTION]
            VARIANT: [VALUE, DESCRIPTION]

        # Another field. A list of two numbers gives a range writeConstraint.
        FIELD: [MINIMUM, MAXIMUM]

        # Another field with separate enumerated values for read and write
        FIELD:
            _read:
                VARIANT: [VALUE, DESCRIPTION]
                VARIANT: [VALUE, DESCRIPTION]
            _write:
                VARIANT: [VALUE, DESCRIPTION]
                VARIANT: [VALUE, DESCRIPTION]
        # Sometimes fields are to big so we need to split them into smaller fields
        EXTI:
          IMR:
            # This would split MR into MRi where i = 0 ... bitlength
            _split: [MR]

Name Matching

Peripheral, register, and field names can be specified:

• Directly
• Using ? and * for single- and multi- character wildcards
• Using [ABC] to give a list of possible matching characters
• Using commas to separate a list of possible matches

You must quote the name if using any special characters in YAML.

Style Guide

• Enumerated values should be named in the past tense ("enabled", "masked", etc).
• Descriptions should start with capital letters but do not end with a period

Releasing

$ make -j16 form
$ env CARGO_INCREMENTAL=0 make -j12 check
$ vi scripts/makecrates.py # update version number
$ python3 scripts/makecrates.py devices/
$ vi CHANGELOG.md # add changelog entry
$ vi README.md # update version number
$ git checkout -b vX.X.X
$ git commit -am "vX.X.X"
$ git push origin vX.X.X
# wait for travis build to succeed
$ git tag -a 'vX.X.X' -m 'vX.X.X'
$ git push origin vX.X.X
$ for f in stm32f0 stm32f1 stm32f2 stm32f3 stm32f4 stm32f7 stm32h7 stm32l0 stm32l1 stm32l4 stm32g0 stm32g4; cd $f; pwd; cargo publish --allow-dirty; cd ..; end

License

Licensed under either of

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