Difference between revisions of "DSP:ReadPipeIfPossible"

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(Clean up.)
 
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| u16, Actual read size
 
| u16, Actual read size
 
|}
 
|}
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= Channels =
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== Channel 2 (Audio) ==
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Channel 2 returns the DSP DRAM addresses of structures located in the [[DSP Memory Region]]. [[DSP:ConvertProcessAddressFromDspDram]] can be used to convert these addresses into virtual memory addresses. The list of addresses and the length of the list vary depending on DSP firmware version.
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== Channel 3 (Binary) ==
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The purpose of channel 3 is unknown. The behaviour of this pipe varies depending on DSP firmware version. Observed behaviours include:
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* doing nothing.
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* echoing what is returned to it.
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* long strings of zeros.

Latest revision as of 22:39, 7 March 2016

Request[edit]

Index Word Description
0 Header code [0x001000c0]
1 Channel (0 - 7 0:Debug from DSP 1:P-DMA 2:audio 3:binary 4-7: free ?)
2 Peer (0 = from DSP, 1 = from ARM)
3 u16, Size

0x100 byte after the Request header

Index Word Description
0 (Size << 14) | 0x2
1 Buffer

Response[edit]

Index Word Description
0 Header code
1 Result code
2 u16, Actual read size

Channels[edit]

Channel 2 (Audio)[edit]

Channel 2 returns the DSP DRAM addresses of structures located in the DSP Memory Region. DSP:ConvertProcessAddressFromDspDram can be used to convert these addresses into virtual memory addresses. The list of addresses and the length of the list vary depending on DSP firmware version.

Channel 3 (Binary)[edit]

The purpose of channel 3 is unknown. The behaviour of this pipe varies depending on DSP firmware version. Observed behaviours include:

  • doing nothing.
  • echoing what is returned to it.
  • long strings of zeros.