GUSPNP(4) | Device Drivers Manual | GUSPNP(4) |
guspnp
—
guspnp* at isapnp?
audio* at audiobus?
There should be no limit caused by the driver on the number of drivers or cards active in the system.
guspnp
driver provides support for audio subsystems
using the Interwave (Am78C20x) family of ICs, usually the Gravis Ultrasound
Plug and Play. Unlike the gus
driver guspnp driver
does not require any local memory for the IC, but uses the codec for both
playback and recording. The guspnp
driver can
simultaneously playback and record 8- and 16-bit samples at frequencies from
5.51kHz to 48kHz.
The guspnp
driver relies on
isapnp
to allocate suitable resources for it. This
version of the driver only uses the first logical device of the five the
Interwave IC has. The four unused logical devices are the ATAPI CD-ROM
device, PnP Joystick device, legacy soundcard emulation device
(SoundBlaster) and MIDI serial device. Support for at least ATAPI CD-ROM and
Joystick is being worked on. This version of the driver will use 1 IRQ and 2
DRQs.
guspnp
driver include:
guspnp
driver appeared in NetBSD
1.3.
Only the Codec is used in this version of the driver, therefore only 2 channels are supported (left and right). Also sound quality is probably worse at lower kHz compared to playing through the synthesizer which does interpolation.
If the implementation has a 'bad' oscillator, using frequencies 44.8kHz and 38.4kHz will result in incorrect playback frequency. The author has a GUS PnP Pro which displays this behavior.
Other members of the Interwave family have not been tested and don't have the glue needed to make them work. Should someone need to implement it, not many changes in the existing code are needed. Output voltage control in register CFIG2 [7] should be set differently for some other members of the family.
Other architectures than i386 haven't been tested. The bus_space abstraction has been used from the beginning, so it should work.
June 22, 2005 | NetBSD 9.4 |