USB Basic Device Driver Support

changes in 10.225: USBAUD2: 1) adding USB audio 2.0 support. The USB audio 1.0 and USB audio 2.0 standards are different enough to justify adding a separate driver for audio 2.0 support (USBAUD2). The driver for audio 1.0 support (USBAUDIO) can still be used along with USBAUD2. All recent USB devices (let's say newer than > 2016) are likely following the audio 2.0 standard. The USBAUD2 supports the very same sample rates and bit resolutions as the USBAUDIO driver does. In addition it supports DSD (via DART) with these sample rates: 44.1,48,88.2,96,176.4,192,352.8,384,705.6,768 kHz. (thanks Wim Brul !) Here is the detailed info that Wim provides: Capabilities of the USB audio 2.0 driver. Supports playback only. Recording not supported. Plays 8/16-bit mono/stereo legacy sample rates (8 kHz, 11.025 kHz, 22.050 kHz). Plays 16/24/32-bit mono/stereo standard sample rates (32 kHz, 44.1 kHz, 48 kHz, 64 kHz, 88.2 kHz, 96 kHz, 176 kHz, 192 kHz, 352.8 kHz, 384 kHz). If a bit resolution / sample rate is not directly supported by the hardware then conversion will take place according to the following table: +-------------------------------------------------------------------------+ | sampling rates 16/24/32-bit mono/stereo to 16/24/32-bit stereo | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | 32.0 | 44.1 | 48.0 | 64.0 | 88.2 | 96.0 | 176.4 | 192.0 | 352.8 | 384.0 | kHz | +------+------+------+------+------+------+-------+-------+-------+-------+-------+---+ | ok | down | down | down | down | down | down | down | down | down | 32.0 | | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | ok | down | down | down | down | down | down | down | down | 44.1 | H | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | ok | down | down | down | down | down | down | down | 48.0 | A | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | ok | down | down | down | down | down | down | 64.0 | R | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | ok | down | down | down | down | down | 88.2 | D | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | up | ok | down | down | down | down | 96.0 | W | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | up | up | ok | down | down | down | 176.4 | A | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | up | up | up | ok | down | down | 192.0 | R | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | up | up | up | up | ok | down | 352.8 | E | +------+------+------+------+------+------+-------+-------+-------+-------+-------+ | | up | up | up | up | up | up | up | up | up | ok | 384.0 | | +------+------+------+------+------+------+-------+-------+-------+-------+-------+---+ a) 16-bit to 24/32-bit and 24-bit to 32-bit is done by zero extension. b) 32-bit to 24/16-bit and 24-bit to 16-bit is done by truncation. c) mono is converted to stereo by sample duplication. d) downsampling is done by throwing away samples. e) upsampling is done by duplicating samples. Playback of DoP (DSD over PCM) is possible when your hardware supports it. CAUTION: Inherent to DSD this requires bit perfect playback and muting and not using maximum volume will result into harmfull noise/static. Playback of raw DSD stereo (DSD32, DSD64, DSD128, DSD256, DSD512) is only possible through the DART interface and when your hardware supports it. CAUTION: Inherent to DSD this requires bit perfect playback and muting and not using maximum volume will result into harmfull noise/static. USBAUDIO: 1) fix error in subtype protocol table: incorrectly specified sample frequency of 352000 Hz, needs to be 352800 Hz. This is already correct in USBAUD2. USBMSD: 1) fixing an error when virtual (in memory) Track 0 of a "large floppy" media is accessed: the driver only ever reads/writes 1 sector in this case, and therefore should only report back handling 1 sector (no matter how many were requested) 2) minor changes in locking segments. No functional impact. USBKBD: 1) fix support for media/system keys on a USB keyboard. Changes to additional drivers (AMOUSE.SYS, IBMKBD.SYS, KBDBASE.SYS) might be necessary to see and use these additional keys in applications. However, you can use XWorkplace to add scancodes for these additional keys via the "function keys" page of the Keyboard object and use these additional keys as keyboard shortcuts to open objects (as described in the XWorkplace help) 2) fix keyboard repeat (hopefully, please report if it still does not work ...). 3) fix handling of toggle flag 4) update/add tracing (major code:228 = 0xE4). USBMOUSE: 1) analogous to USBKBD 3), fix handling of toggle flag 2) update/add tracing (major code:228 = 0xE4). USBHID: 1) minor changes in locking segments. No functional impact. 2) update/add tracing (major code:228 = 0xE4). USBEHCD: 1) isochronous data transfer: fixed a bug in "AccIsoBuffer" when arming the context hook to start isochronous processing. The bug lead to overwriting the device driver's header which in turn would break the device driver chain. USBCALLS: 1) properly close notification mutex on DLL termination

-------------------------------------------------------------------------------- changes in 10.223: EHCI: 1) fixed errors in bandwidth deallocation computation. The effect of the bug was that extended use of mouse/keyboard attached to USB 2.0 hub would increasingly slow down the system and finally make mouse/keyboard non-operational 2) properly serialize allocation and deallocation of TDs (transfer descriptors). Looks like after an extended time span of using mouse/keyboard attached to USB 2.0, the system is running out of free TDs which eventually leads to a system freeze USBPRT: 1) limit the number of USB printers to 4 (and 2 COM port connected printers). It used to be 32 printers (and 16 COM port connected printers) and on driver init, 2 GDT selectors per printer are allocated. GDT selectors are a scarce resource and each GDT selector allocation reduces free memory space in the system arena. USBD: 1) add Transaction Translator (TT) reset for all hubs on initial hub enumeration to get hubs into a consistent state after system start. This is essential for USB 1.x devices attached to a USB 2.0 hub. 2) call HC resets and enumeration of root hubs for all HCs on multiple invocations of the context hook dedicated for this job. That will (hopefully) prevent the system from hanging because HC reset will take an extended period of time

Change Log ========== v.11.16 08-Jun-2017 - David Azarewicz Misc cosmetic changes for debugging.

Change Log ========== v.11.14 27-Nov-2015 - David Azarewicz Fixed a problem booting from USB devices.