DSP:ReadPipeIfPossible: Difference between revisions

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|-
|-
| 1
| 1
| chan (0 - 7 0:Debug from DSP 1:P-DMA 2:audio 3:binary 4-7: free ?)
| Channel (0 - 7 0:Debug from DSP 1:P-DMA 2:audio 3:binary 4-7: free ?)
|-
|-
| 2
| 2
| direction? (0 = from DSP 1 = from ARM ??? )
| Peer (0 = from DSP, 1 = from ARM)
|-
|-
| 3
| 3
| ?size? (halfword)
| u16, Size
|}
|}


Line 25: Line 25:
|-
|-
| 0
| 0
| (size <<14) <nowiki>|</nowiki> 0x2
| (Size << 14) <nowiki>|</nowiki> 0x2
|-
|-
| 1
| 1
| buffer
| Buffer
|}
|}


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|-
|-
| 1
| 1
| Resultcode
| Result code
|-
|-
| 2
| 2
| sizeread? (hword)
| u16, Actual read size
|}
|}
= Channels =
== Channel 2 (Audio) ==
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) ==
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.

Latest revision as of 23:39, 7 March 2016

Request

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

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

Channels

Channel 2 (Audio)

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)

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.