AMD PCM-5896 Uživatelský manuál stáhnout pdf (Strana 8)

possible to use them in our embedded environment, we decided to go with the OSS (

Open Sound System ) sound drivers that came with our pre-loaded kernel. When we

tested the OPENH323 software, we found that it did not have any problem working with

these drivers. So it became the default choice since it did not involve any new

compilation or installation, an important consideration given the lack of a development

environment on our Hardware .

4.2.2.2 PCMCIA/WAVELAN Drivers

These came pre-installed on our Single Board Computer. Although we had some hiccups

configuring the drivers with the options we wanted, we were able to do so with some help

from our lab TA. We installed the 3.1.22 PCMCIA package on our desktops for testing

purposes. Lucent Technologies also provided a driver with their Wavelan PCMCIA card

(module name: wavelan2_cs). We did not use it for the simple reason that it was not pre-

installed on our SBC. A more important reason was that the open source linux driver

whose module was named wvlan_cs provided much better signal strength in Ad-Hoc

mode ( wireless networking between peer machines equipped with Lucent IEEE Wavelan

cards without an intermediary base station ) which was the case for our network. This

was especially important to our voice application since it could affect the quality of

sound. Besides the open source nature of the wvlan_cs made it possible for us to solve

any problems relating to the wireless nature of our software. For example we were not

able to ping the neighboring host equipped with the other wavelan card at first because

we had to specify Ad-Hoc mode when loading the driver. However we did not know the

correct variable name to specify. A look at the code for the wavelan driver yielded this

variable name to be PORT_TYPE and the correct value to be set to 3. This enabled us to

get the correct behavior from our card.

4.2.3 CONFIGURATION UTILITIES

4.2.3.1 AUMIX

This is a utility to manipulate the mixer controls for the sound card. It can be found under

/usr/bin. This played an important part in our project because we were unable to

configure the soundcard to record from mic. The command:

aumix –m R

allowed us to remedy this condition.

For more detailed documentation please do:

man aumix

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AMD PCM-5896 Uživatelský manuál Strana 8