You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.5 KiB
35 lines
1.5 KiB
20 years ago
|
Documentation for the ESS AudioDrive chips
|
||
|
|
|
||
|
|
In 2.4 kernels the SoundBlaster driver not only tries to detect an ESS chip, it
|
||
|
|
tries to detect the type of ESS chip too. The correct detection of the chip
|
||
|
|
doesn't always succeed however, so unless you use the kernel isapnp facilities
|
||
|
|
(and you chip is pnp capable) the default behaviour is 2.0 behaviour which
|
||
|
|
means: only detect ES688 and ES1688.
|
||
|
|
|
||
|
|
All ESS chips now have a recording level setting. This is a need-to-have for
|
||
|
|
people who want to use their ESS for recording sound.
|
||
|
|
|
||
|
|
Every chip that's detected as a later-than-es1688 chip has a 6 bits logarithmic
|
||
|
|
master volume control.
|
||
|
|
|
||
|
|
Every chip that's detected as a ES1887 now has Full Duplex support. Made a
|
||
|
|
little testprogram that shows that is works, haven't seen a real program that
|
||
|
|
needs this however.
|
||
|
|
|
||
|
|
For ESS chips an additional parameter "esstype" can be specified. This controls
|
||
|
|
the (auto) detection of the ESS chips. It can have 3 kinds of values:
|
||
|
|
|
||
|
|
-1 Act like 2.0 kernels: only detect ES688 or ES1688.
|
||
|
|
0 Try to auto-detect the chip (may fail for ES1688)
|
||
|
|
688 The chip will be treated as ES688
|
||
|
|
1688 ,, ,, ,, ,, ,, ,, ES1688
|
||
|
|
1868 ,, ,, ,, ,, ,, ,, ES1868
|
||
|
|
1869 ,, ,, ,, ,, ,, ,, ES1869
|
||
|
|
1788 ,, ,, ,, ,, ,, ,, ES1788
|
||
|
|
1887 ,, ,, ,, ,, ,, ,, ES1887
|
||
|
|
1888 ,, ,, ,, ,, ,, ,, ES1888
|
||
|
|
|
||
|
|
Because Full Duplex is supported for ES1887 you can specify a second DMA
|
||
|
|
channel by specifying module parameter dma16. It can be one of: 0, 1, 3 or 5.
|
||
|
|
|