| LUFA Library 140302 |

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Known Issues

The following are known issues present in each official LUFA release. This list should contain all known issues in the library. Most of these issues should be corrected in the future release - see Future Changes for a list of planned changes in future releases.

# Version 140302

- AVR8 Architecture
  - No known issues.
- UC3 Architecture
  Warning
    The UC3 device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the UC3 devices in the current release, although the architecture is supported in the LUFA core library.
    - DMA transfers to and from the USB controller are not yet implemented for this release.
    - The UC3C, UC3D and UC3L sub-families of UC3 are not currently supported by the library due to their altered USB controller design.
    - The various `*_CreateStream`() functions for creating standard `<stdio.h>` compatible virtual file streams are not available on the UC3 architecture, due to a lack of suitable library support.
- XMEGA Architecture
  Warning
    The XMEGA device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - Endpoints of more than 64 bytes are not currently supported in this release.
    - Isochronous endpoints are not currently supported in this release. As a result, the audio class cannot be used on XMEGA devices.
    - Multiple-bank endpoints are not currently supported in this release.
    - Early silicon revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata relating to the USB controller.
- Architecture Independent
  - The LUFA library is not watchdog aware, and thus timeouts are possible if short periods are used and a lengthy USB operation is initiated.
  - No LUFA provided driver INF files for Windows are signed, and thus may fail to install on systems where driver signing is enforced (e.g. Windows 8).
- Build System
  - No known issues.
- Atmel Studio Integration
  - Not all devices are listed in the "Supported Parts" screen when selecting a device. To select an alternative device, change the "Show Device" drop-down to "All Parts".
  - When switching boards after changing the device selection, a second conflicting BOARD symbol definition can be created that prevents successful compilation. To fix, open the project properties window (Project->Project {name} Properties... menu item), click the Toolchain tab, click "Symbols" under the "AVR/GNU C Compiler" section and remove the incorrect definition.

# Version 130901

- AVR8 Architecture
  - No known issues.
- UC3 Architecture
  Warning
    The UC3 device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the UC3 devices in the current release, although the architecture is supported in the LUFA core library.
    - DMA transfers to and from the USB controller are not yet implemented for this release.
    - The UC3C, UC3D and UC3L sub-families of UC3 are not currently supported by the library due to their altered USB controller design.
    - The various `*_CreateStream`() functions for creating standard `<stdio.h>` compatible virtual file streams are not available on the UC3 architecture, due to a lack of suitable library support.
- XMEGA Architecture
  Warning
    The XMEGA device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - Endpoints of more than 64 bytes are not currently supported in this release.
    - Isochronous endpoints are not currently supported in this release. As a result, the audio class cannot be used on XMEGA devices.
    - Multiple-bank endpoints are not currently supported in this release.
    - Early silicon revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata relating to the USB controller.
- Architecture Independent
  - The LUFA library is not watchdog aware, and thus timeouts are possible if short periods are used and a lengthy USB operation is initiated.
  - No LUFA provided driver INF files for Windows are signed, and thus may fail to install on systems where driver signing is enforced (e.g. Windows 8).
- Build System
  - No known issues.
- Atmel Studio Integration
  - Not all devices are listed in the "Supported Parts" screen when selecting a device. To select an alternative device, change the "Show Device" drop-down to "All Parts".
  - When switching boards after changing the device selection, a second conflicting BOARD symbol definition can be created that prevents successful compilation. To fix, open the project properties window (Project->Project {name} Properties... menu item), click the Toolchain tab, click "Symbols" under the "AVR/GNU C Compiler" section and remove the incorrect definition.

# Version 130303

- AVR8 Architecture
  - No known issues.
- UC3 Architecture
  Warning
    The UC3 device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the UC3 devices in the current release, although the architecture is supported in the LUFA core library.
    - DMA transfers to and from the USB controller are not yet implemented for this release.
    - The UC3C, UC3D and UC3L sub-families of UC3 are not currently supported by the library due to their altered USB controller design.
    - The various `CreateStream()` functions for creating standard `<stdio.h>` compatible virtual file streams are not available on the UC3 architecture, due to a lack of suitable library support.
- XMEGA Architecture
  Warning
    The XMEGA device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the XMEGA devices in the current release, although the architecture is supported in the LUFA core library.
    - Endpoints of more than 64 bytes are not currently supported in this release.
    - Isochronous endpoints are not currently supported in this release. As a result, the audio class cannot be used on XMEGA devices.
    - Multiple-bank endpoints are not currently supported in this release.
    - Early revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata relating to the USB controller.
- Architecture Independent
  - The LUFA library is not watchdog aware, and thus timeouts are possible if short periods are used and a lengthy USB operation is initiated.
  - No LUFA provided driver INF files for Windows are signed, and thus may fail to install on systems where driver signing is enforced (e.g. Windows 8).
- Build System
  - No known issues.

# Version 120730

- AVR8 Architecture
  - No known issues.
- UC3 Architecture
  Warning
    The UC3 device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the UC3 devices in the current release, although the architecture is supported in the LUFA core library.
    - DMA transfers to and from the USB controller are not yet implemented for this release.
    - The UC3C, UC3D and UC3L sub-families of UC3 are not currently supported by the library due to their altered USB controller design.
    - The various `CreateStream()` functions for creating standard `<stdio.h>` compatible virtual file streams are not available on the UC3 architecture, due to a lack of suitable library support.
- XMEGA Architecture
  Warning
    The XMEGA device support is currently experimental (incomplete and/or non-functional), and is included for preview purposes only.
    - No demos, bootloaders or projects have been ported for the XMEGA devices in the current release, although the architecture is supported in the LUFA core library.
    - Endpoints of more than 64 bytes are not currently supported in this release.
    - Isochronous endpoints are not currently supported in this release. As a result, the audio class cannot be used on XMEGA devices.
    - Multiple-bank endpoints are not currently supported in this release.
    - Early revisions of the ATXMEGA128A1U are incompatible with LUFA, due to their various errata relating to the USB controller.
- Architecture Independent
  - The LUFA library is not watchdog aware, and thus timeouts are possible if short periods are used and a lengthy USB operation is initiated.
  - No LUFA provided driver INF files for Windows are signed, and thus may fail to install on systems where driver signing is enforced (e.g. Windows 8).
- Build System
  - No known issues.