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.