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