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SVDSuite

Note

The long-term goal is to merge SVDSuite into the cmsis-svd repository and release it as version 1.0. The author of SVDSuite is also an active maintainer of the CMSIS-SVD project.

SVDSuite is a Python package to parse, process, manipulate, validate, and generate CMSIS SVD files. Currently, the suite supports CMSIS-SVD standard 1.3.10-dev16, whereas the validation additionally supports all previously released standards.

The CMSIS System View Description format (CMSIS-SVD) formalizes the description of the system contained in Arm Cortex-M processor-based microcontrollers, in particular, the memory-mapped registers of peripherals. The detail contained in system view descriptions is comparable to the data in device reference manuals. The information ranges from high-level functional descriptions of a peripheral all the way down to the definition and purpose of an individual bit field in a memory-mapped register.

CMSIS-SVD files are developed and maintained by silicon vendors. Silicon vendors distribute their descriptions as part of CMSIS Device Family Packs. Tool vendors use CMSIS-SVD files for providing device-specific debug views of peripherals in their debugger. Last but not least, CMSIS-compliant device header files are generated from CMSIS-SVD files. 1

Compatibility with SVDConv

SVDSuite was designed with a strong focus on compatibility with SVDConv, the official CMSIS tool for validating and processing SVD files. To ensure full compatibility, all available SVD files were tested against SVDConv (checkout the comparison repository).

Extended Functionality

In addition to faithfully supporting the CMSIS-SVD specification, SVDSuite offers several enhancements beyond the standard:

  • Forward references: SVDSuite allows references to elements that are defined later in the same file, providing more flexibility in SVD authoring and structuring.
  • Full resolution of enumeratedValues: Wildcards, default values, and all inheritance scenarios within enumeratedValues are fully resolved, enabling consistent and complete interpretation of value definitions.

SVD Test Files and Test Cases

During the development of SVDSuite, it became evident that the CMSIS-SVD standard is sometimes insufficiently documented and leaves room for interpretation. Moreover, SVDConv, the official tool provided by Arm for validating and processing SVD files, supports a variety of undocumented features that are not part of the written specification.

These undocumented behaviors include (but are not limited to):

  • Setting and resolving default values (e.g., for access types, sizes, reset values).
  • Propagation and adjustment of size attributes across the hierarchy.
  • Interpretation of “don’t care” bits in enumeratedValues (e.g., 0b1xxxxxxx).

To ensure compatibility with these behaviors and to avoid ambiguous interpretations, over 170 comprehensive test cases were created and are documented here. Each test is based on a fully defined CMSIS-SVD file, enabling systematic validation of how SVDConv interprets specific constructs and edge cases. These test files may also be useful for other developers working on SVD parsers.

In addition, SVDConv was extended with the options --debug-output-text and --debug-output-json, allowing developers to inspect how SVDConv internally resolves, normalizes, and transforms SVD files. These extensions greatly improve transparency and helped align SVDSuite's behavior with that of SVDConv, even in the presence of undocumented logic. The modified version is hosted here.

Installation

Install SVDSuite with pip:

  pip install svdsuite

Usage/Examples

Process

To process a CMSIS-SVD file, which includes parsing, you can utilize the Process class.

from svdsuite import Process
from svdsuite.model import Cluster, Register

svd_str = """\
<?xml version='1.0' encoding='utf-8'?>
<device xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="CMSIS-SVD.xsd" schemaVersion="1.3">
  <name>STM32F0</name>
  <version>1.0</version>
  <description>Test_Example device</description>
  <cpu>
  <name>CM0</name>
  <revision>r0p0</revision>
  <endian>little</endian>
  <mpuPresent>false</mpuPresent>
  <fpuPresent>false</fpuPresent>
  <nvicPrioBits>4</nvicPrioBits>
  <vendorSystickConfig>false</vendorSystickConfig>
  </cpu>
  <addressUnitBits>8</addressUnitBits>
  <width>32</width>
  <peripherals>
    <peripheral>
      <name>TimerExt</name>
      <baseAddress>0x40000000</baseAddress>
      <addressBlock>
        <offset>0x0</offset>
        <size>0x1000</size>
        <usage>registers</usage>
      </addressBlock>
      <registers>
        <register derivedFrom="Timer0.CR1">
          <name>CR1</name>
          <addressOffset>0x00</addressOffset>
        </register>
      </registers>
    </peripheral>
    <peripheral>
      <dim>2</dim>
      <dimIncrement>0x1000</dimIncrement>
      <name>Timer[%s]</name>
      <baseAddress>0x40001000</baseAddress>
      <addressBlock>
        <offset>0x0</offset>
        <size>0x1000</size>
        <usage>registers</usage>
      </addressBlock>
      <registers>
        <cluster>
          <dim>4</dim>
          <dimIncrement>0x20</dimIncrement>
          <name>CC[%s]</name>
          <description>Capture/Compare Channel</description>
          <addressOffset>0x0</addressOffset>
          <register>
            <name>CCR</name>
            <description>Capture/Compare Register</description>
            <addressOffset>0x00</addressOffset>
          </register>
          <register>
            <name>CCMR</name>
            <description>Capture/Compare Mode Register</description>
            <addressOffset>0x04</addressOffset>
          </register>
          <register>
            <name>CCER</name>
            <description>Capture/Compare Enable Register</description>
            <addressOffset>0x08</addressOffset>
          </register>
        </cluster>
        <register>
          <name>CR1</name>
          <description>Control Register 1</description>
          <addressOffset>0x80</addressOffset>
          <size>32</size>
          <access>read-write</access>
          <fields>
            <field>
              <name>CEN</name>
              <description>Counter Enable</description>
              <bitOffset>0</bitOffset>
              <bitWidth>1</bitWidth>
              <enumeratedValues>
                <name>CEN_Values</name>
                <enumeratedValue>
                  <name>Disabled</name>
                  <description>Counter disabled</description>
                  <value>0</value>
                </enumeratedValue>
                <enumeratedValue>
                  <name>Enabled</name>
                  <description>Counter enabled</description>
                  <value>1</value>
                </enumeratedValue>
              </enumeratedValues>
            </field>
            <field>
              <name>CMS</name>
              <description>Center-aligned Mode Selection</description>
              <bitOffset>5</bitOffset>
              <bitWidth>2</bitWidth>
              <enumeratedValues>
                <name>CMS_Values</name>
                <enumeratedValue>
                  <name>EdgeAligned</name>
                  <description>Edge-aligned mode</description>
                  <value>0b00</value>
                </enumeratedValue>
                <enumeratedValue>
                  <name>CenterAligned1</name>
                  <description>Center-aligned mode 1</description>
                  <value>0b01</value>
                </enumeratedValue>
                <enumeratedValue>
                  <name>CenterAligned2</name>
                  <description>Center-aligned mode 2</description>
                  <value>0b10</value>
                </enumeratedValue>
                <enumeratedValue>
                  <name>CenterAligned3</name>
                  <description>Center-aligned mode 3</description>
                  <value>0b11</value>
                </enumeratedValue>
              </enumeratedValues>
            </field>
            <field>
              <name>Status</name>
              <description>Status Field with Don't Care Bits</description>
              <bitOffset>8</bitOffset>
              <bitWidth>8</bitWidth>
              <access>read-only</access>
              <enumeratedValues>
                <name>Status_Values</name>
                <enumeratedValue>
                  <name>OK</name>
                  <description>No error</description>
                  <value>0b0xxxxxxx</value>
                </enumeratedValue>
                <enumeratedValue>
                  <name>Error</name>
                  <description>Error condition</description>
                  <value>0b1xxxxxxx</value>
                </enumeratedValue>
              </enumeratedValues>
            </field>
          </fields>
        </register>
      </registers>
    </peripheral>
  </peripherals>
</device>
    """

# Process the SVD string. Alternatively, you can use the `from_svd_file` method to parse a SVD file
# or the `from_xml_content` method to parse svd byte content.
# Additionally, you can specify a resolver_logging_file_path to debug the resolver step by step.
process = Process.from_xml_str(svd_str)
# parser = Parser.from_svd_file("path/to/svd_file.svd")
# parser = Parser.from_xml_content(svd_str.encode())

# Get the SVDDevice object
device = process.get_processed_device()

print("Print the peripheral names and the register count for each peripheral:")
for peripheral in device.peripherals:
    print(f"Peripheral: {peripheral.name}, Register Count: {len(peripheral.registers)}")

print("\n\nPrint the register names and their base address for each peripheral:")
for peripheral in device.peripherals:
    print(f"Peripheral: {peripheral.name}")
    for register in peripheral.registers:
        print(f"  Register: {register.name}, Base Address: 0x{register.base_address:X}")

print("\n\nPrint the field names and their bit offsets for each register:")
for peripheral in device.peripherals:
    print(f"Peripheral: {peripheral.name}")
    for register in peripheral.registers:
        print(f"  Register: {register.name}")
        for field in register.fields:
            print(f"    Field: {field.name}, Bit Offset: {field.bit_offset}")

print("\n\nPrint the enumerated values for each field:")
for peripheral in device.peripherals:
    print(f"Peripheral: {peripheral.name}")
    for register in peripheral.registers:
        print(f"  Register: {register.name}")
        for field in register.fields:
            print(f"    Field: {field.name}")
            for enum_value_cont in field.enumerated_value_containers:
                for enum_value in enum_value_cont.enumerated_values:
                    print(f"      Enumerated Value: {enum_value.name}, Value: {enum_value.value}")

print("\n\nPrint peripherals with registers but include clusters:")
for peripheral in device.peripherals:
    print(f"Peripheral: {peripheral.name}")
    # We ignore that clusters could be nested here for simplicity
    # In a real-world scenario, you would need to handle nested clusters appropriately
    for reg_cluster in peripheral.registers_clusters:
        if isinstance(reg_cluster, Cluster):
            print(f"  Cluster: {reg_cluster.name}")
            for register in reg_cluster.registers_clusters:
                print(f"    Register: {register.name}, Base Address: 0x{register.base_address:X}")
        elif isinstance(reg_cluster, Register):
            print(f"  Register: {reg_cluster.name}, Base Address: 0x{reg_cluster.base_address:X}")

Have a look into svdsuite/model/process.py for all the models (dataclasses).

Parse

To parse a CMSIS-SVD file you can utilize the Parser class.

import pprint
from svdsuite import Parser

svd_str = """\
    <device xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
        xs:noNamespaceSchemaLocation="CMSIS-SVD.xsd" schemaVersion="1.3">
        <name>STM32F0</name>
        <version>1.0</version>
        <description>STM32F0 device</description>
        <cpu>
            <name>CM52</name>
            <revision>r0p0</revision>
            <endian>little</endian>
            <mpuPresent>false</mpuPresent>
            <fpuPresent>false</fpuPresent>
            <fpuDP>false</fpuDP>
            <dspPresent>false</dspPresent>
            <icachePresent>false</icachePresent>
            <dcachePresent>false</dcachePresent>
            <itcmPresent>false</itcmPresent>
            <dtcmPresent>false</dtcmPresent>
            <vtorPresent>false</vtorPresent>
            <nvicPrioBits>2</nvicPrioBits>
            <vendorSystickConfig>false</vendorSystickConfig>
            <deviceNumInterrupts>6</deviceNumInterrupts>
            <sauNumRegions>2</sauNumRegions>
            <sauRegionsConfig enabled="true" protectionWhenDisabled="s">
                <region enabled="true" name="Region1">
                    <base>0x1000</base>
                    <limit>0x2000</limit>
                    <access>n</access>
                </region>
            </sauRegionsConfig>
        </cpu>
        <addressUnitBits>8</addressUnitBits>
        <width>32</width>
        <peripherals>
            <peripheral derivedFrom="test">
                <name>Timer1</name>
                <version>1.0</version>
                <description>Timer 1 is a standard timer</description>
                <alternatePeripheral>Timer1_Alt</alternatePeripheral>
                <groupName>group_name</groupName>
                <prependToName>prepend</prependToName>
                <appendToName>append</appendToName>
                <headerStructName>headerstruct</headerStructName>
                <disableCondition>discond</disableCondition>
                <baseAddress>0x40002000</baseAddress>
            </peripheral>
        </peripherals>
    </device>
    """

# Parse the SVD string. Alternatively, you can use the `from_svd_file` method to parse a SVD file
# or the `from_xml_content` method to parse svd byte content.
parser = Parser.from_xml_str(svd_str)
# parser = Parser.from_svd_file("path/to/svd_file.svd")
# parser = Parser.from_xml_content(svd_str.encode())

# Get the SVDDevice object
device = parser.get_parsed_device()

# Print the device object
pprint.pprint(device)

Output:

SVDDevice(
  size=None,
  access=None,
  protection=None,
  reset_value=None,
  reset_mask=None,
  xs_no_namespace_schema_location='CMSIS-SVD.xsd',
  schema_version='1.3',
  vendor=None,
  vendor_id=None,
  name='STM32F0',
  series=None,
  version='1.0',
  description='STM32F0 device',
  license_text=None,
  cpu=SVDCPU(
    name=<CPUNameType.CM52: 'CM52'>,
    revision='r0p0',
    endian=<EndianType.LITTLE: 'little'>,
    mpu_present=False,
    fpu_present=False,
    fpu_dp=False,
    dsp_present=False,
    icache_present=False,
    dcache_present=False,
    itcm_present=False,
    dtcm_present=False,
    vtor_present=False,
    nvic_prio_bits=2,
    vendor_systick_config=False,
    device_num_interrupts=6,
    sau_num_regions=2,
    sau_regions_config=SVDSauRegionsConfig(
      enabled=True,
      protection_when_disabled=<ProtectionStringType.SECURE: 's'>,
      regions=[
        SVDSauRegion(
          enabled=True,
          name='Region1',
          base=4096,
          limit=8192,
          access=<SauAccessType.NON_SECURE: 'n'>
        )
      ]
    )
  ),
  header_system_filename=None,
  header_definitions_prefix=None,
  address_unit_bits=8,
  width=32,
  peripherals=[
    SVDPeripheral(
      size=None,
      access=None,
      protection=None,
      reset_value=None,
      reset_mask=None,
      dim=None,
      dim_increment=None,
      dim_index=None,
      dim_name=None,
      dim_array_index=None,
      name='Timer1',
      version='1.0',
      description='Timer 1 is a standard timer',
      alternate_peripheral='Timer1_Alt',
      group_name='group_name',
      prepend_to_name='prepend',
      append_to_name='append',
      header_struct_name='headerstruct',
      disable_condition='discond',
      base_address=1073750016,
      address_blocks=[],
      interrupts=[],
      registers_clusters=[],
      derived_from='test'
    )
  ]
)

Have a look into svdsuite/model/parse.py for all the models (dataclasses).

Create/Manipulate

To create or manipulate a CMSIS-SVD file you can utilize the Serializer class.

from svdsuite import Serializer
from svdsuite.model import (
    SVDDevice,
    SVDCPU,
    CPUNameType,
    EndianType,
    SVDSauRegionsConfig,
    ProtectionStringType,
    SVDSauRegion,
    SauAccessType,
    SVDPeripheral,
)

# Create an example device. Alternatevily, you can parse a CMSIS-SVD file and manipulate it.
device = SVDDevice(
    xs_no_namespace_schema_location="CMSIS-SVD.xsd",
    schema_version="1.3",
    name="STM32F0",
    version="1.0",
    description="STM32F0 device",
    cpu=SVDCPU(
        name=CPUNameType.CM52,
        revision="r0p0",
        endian=EndianType.LITTLE,
        nvic_prio_bits=2,
        vendor_systick_config=False,
        sau_regions_config=SVDSauRegionsConfig(
            enabled=True,
            protection_when_disabled=ProtectionStringType.SECURE,
            regions=[
                SVDSauRegion(
                    enabled=True,
                    name="Region1",
                    base=4096,
                    limit=8192,
                    access=SauAccessType.NON_SECURE,
                )
            ],
        ),
    ),
    address_unit_bits=8,
    width=32,
    peripherals=[
        SVDPeripheral(
            name="Timer1",
            description="Timer 1 is a standard timer",
            base_address=1073750016,
        )
    ],
)

# Serialize the device object. Alternatively, you can use the `device_to_svd_file` method to serialize the device
# object to an SVD file, or the `device_to_svd_content` method to serialize the device object to bytes string.
svd_str = Serializer.device_to_svd_str(device, pretty_print=True)
# SVDSerializer.device_to_svd_file("path/to/svd_file.svd", device)
# svd_str = SVDSerializer.device_to_svd_content(device, pretty_print=True).decode()

# Print the serialized device object
print(svd_str)

Output:

<device xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:noNamespaceSchemaLocation="CMSIS-SVD.xsd" schemaVersion="1.3">
  <name>STM32F0</name>
  <version>1.0</version>
  <description>STM32F0 device</description>
  <cpu>
    <name>CM52</name>
    <revision>r0p0</revision>
    <endian>little</endian>
    <nvicPrioBits>2</nvicPrioBits>
    <vendorSystickConfig>false</vendorSystickConfig>
    <sauRegionsConfig enabled="true" protectionWhenDisabled="s">
      <region enabled="true" name="Region1">
        <base>0x1000</base>
        <limit>0x2000</limit>
        <access>n</access>
      </region>
    </sauRegionsConfig>
  </cpu>
  <addressUnitBits>8</addressUnitBits>
  <width>32</width>
  <peripherals>
    <peripheral>
      <name>Timer1</name>
      <description>Timer 1 is a standard timer</description>
      <baseAddress>0x40002000</baseAddress>
    </peripheral>
  </peripherals>
</device>

Validate

To validate a CMSIS-SVD file you can utilize the Validator class.

from svdsuite import Validator

xml_str = """\
<device xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
    xs:noNamespaceSchemaLocation="CMSIS-SVD.xsd" schemaVersion="1.3">
    <name>STM32F0</name>
    <version>1.0</version>
    <description>STM32F0 device</description>
    <addressUnitBits>8</addressUnitBits>
    <width>32</width>
    <peripherals>
        <peripheral derivedFrom="test">
            <name>Timer1</name>
            <baseAddress>0x40002000</baseAddress>
        </peripheral>
    </peripherals>
</device>
"""

# Validate the XML string. If the XML is invalid, an exception is raised, since get_exception=True.
# If get_exception=False, the function returns False on invalid XML without an exception.
# Alternatively, you can use the `validate_xml_file` or `validate_xml_content` methods.
if Validator.validate_xml_str(xml_str, get_exception=True):
    print("SVD is valid")

Output:

SVD is valid

Running Tests

To run tests, run the following command:

  git clone https://github.com/ARMify-Project/SVDSuite.git svdsuite
  cd svdsuite/
  pytest tests/

Acknowledgement

This project was made possible with funding from the European Defence Fund under GA no. 101121403 (NEWSROOM) and NGI Zero Entrust Fund. NGI Zero Entrust Fund is part of the European Commission's Next Generation Internet initiative. Project webpage: https://nlnet.nl/project/ARMify/

Footnotes

  1. https://open-cmsis-pack.github.io/svd-spec/main/index.html ↩

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A Python package to parse, process, manipulate, validate, and generate CMSIS SVD files.

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microcontroller cortex-m embedded-systems cmsis-svd

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