DSP Memory Region - Revision history

Peachy at 21:00, 28 September 2024

2024-09-28T19:00:44Z

← Older revision		Revision as of 23:00, 28 September 2024
Line 382:		Line 382:
	Read/Write.		Read/Write.

	PCM32. Also serves an aux function, allowing the ARM11 to apply custom effects to audio. Internal format of the DSP firmware is ~~quadaphonic~~ audio.		PCM32. Also serves an aux function, allowing the ARM11 to apply custom effects to audio. Internal format of the DSP firmware is quadraphonic audio.

	This structure is 5120 bytes long.		This structure is 5120 bytes long.

2024-01-27T04:50:55Z

Correct dsp status

← Older revision		Revision as of 07:50, 27 January 2024
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	== DSP status ==		== DSP status ==

	Read only. A 12 byte long structure~~. There are 24 of them~~.		Read only. A 32 byte long structure.

	{\| class="wikitable"		{\| class="wikitable"
Line 345:		Line 345:
	\|-		\|-
	\| 0		\| 0
	\| u8		\| u16
	\| ~~If current channel is enabled~~		\| ?
	\|-
	~~\| 1~~
	~~\| u8~~
	~~\| Set when current Buffer ID is updated~~
	\|-		\|-
	\| 2		\| 2
	\| u16		\| u16
	\| ~~DSP side sync count~~		\| Number of dropped frames
	\|-
	~~\| 4~~
	~~\| u32~~
	~~\| Buffer position~~
	\|-
	~~\| 8~~
	~~\| u16~~
	~~\| current Buffer ID~~
	\|-		\|-
	\| 10		\| 4
	\| ~~u16~~		\| 28 bytes
	\| ?		\| ?
	\|}		\|}

2024-01-21T15:54:55Z

DSP status

2024-01-21T15:53:44Z

DSP status

@@ Line 336: / Line 336: @@
 == DSP status ==
-Read only.
+Read only. A 12 byte long structure. There are 24 of them.
 == Output samples ==

2016-09-01T20:18:38Z

I don't own the page.

← Older revision		Revision as of 00:18, 2 September 2016
Line 1:		Line 1:
	''~~'Some of this is known to be incorrect. I'll correct this in a few months after a bit more RE work. [[User:Merry\|Merry]] ([[User talk:Merry\|talk]]) 21:10, 28 January 2016 (CET)'''~~		''Note that everything below may vary depending on the exact DSP firmware used and different variants have slightly different behaviours.''

	~~----~~

	Note that everything below ~~will~~ vary depending on the exact DSP firmware used and different variants have slightly different behaviours.

	The DSP communicates with the application through two shared memory areas 0x8000 bytes long each (at 0x1FF50000 and 0x1FF70000 respectively). The DSP alternates between the use of these two areas (much like a double-buffer). Each area has 15 structures within it. The location of these structures can be obtained by [[DSP:ReadPipe\|reading channel 2 of the DSP pipe]]. A list of structures in the order the DSP addresses are read from the pipe follows:		The DSP communicates with the application through two shared memory areas 0x8000 bytes long each (at 0x1FF50000 and 0x1FF70000 respectively). The DSP alternates between the use of these two areas (much like a double-buffer). Each area has 15 structures within it. The location of these structures can be obtained by [[DSP:ReadPipe\|reading channel 2 of the DSP pipe]]. A list of structures in the order the DSP addresses are read from the pipe follows:

2016-08-07T11:24:49Z

Category DSP

← Older revision		Revision as of 15:24, 7 August 2016
Line 414:		Line 414:

	A precomputed response curve lookup table for the compressor.		A precomputed response curve lookup table for the compressor.

			[[Category:DSP]]

2016-06-23T11:30:03Z

← Older revision		Revision as of 15:30, 23 June 2016
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	\| Right-channel Samples		\| Right-channel Samples
	\|}		\|}

			This structure has separate arrays for the left and right channels.

	== Intermediate mix samples ==		== Intermediate mix samples ==
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	\|}		\|}

	~~Yes, this has the dimensionality opposite~~ to ~~that of~~ the output samples, ~~that is not a mistake~~.		In contrast to the final output samples, this structure has the left/right channels interleaved.

	=== Intermediate sample ===		=== Intermediate sample ===

2016-06-23T11:24:07Z

Intermediate mix samples

2016-06-23T11:21:47Z

← Older revision		Revision as of 15:21, 23 June 2016
Line 344:		Line 344:
	== Output samples ==		== Output samples ==

	Read only. This structure is 640 bytes long.		Read only. This structure is 640 bytes long. Output is stereo (the 3DS has two speakers).

	{\| class="wikitable"		{\| class="wikitable"
Line 353:		Line 353:
	\|-		\|-
	\| 0		\| 0
	\| s16[160][2]		\| s16[160]
	\| ~~Samples (Stereo~~-~~output, 160 samples per~~ channel)		\| Left-channel Samples
			\|-
			\| 320
			\| s16[160]
			\| Right-channel Samples
	\|}		\|}

Line 361:		Line 365:
	Read/Write.		Read/Write.

	PCM32. Also serves an aux function, allowing the ARM11 to apply custom effects to audio.		PCM32. Also serves an aux function, allowing the ARM11 to apply custom effects to audio. Internal format of the DSP firmware is quadaphonic audio.

	This structure is 5120 bytes long.		This structure is 5120 bytes long.
Line 372:		Line 376:
	\|-		\|-
	\| 0		\| 0
	\| ~~s32[2][4]~~[160]		\| IntermediateSample[160]
	\| Samples		\| Samples. There are
			\|}

			Yes, this has the dimensionality opposite to that of the output samples, that is not a mistake.

			=== Intermediate sample ===

			A quadraphonic sample.

			{\| class="wikitable"
			\|-
			\| Offset
			\| Type
			\| Description
			\|-
			\| 0
			\| s32
			\| Left Channel A
			\|-
			\| 4
			\| s32
			\| Right Channel A
			\|-
			\| 8
			\| s32
			\| Left Channel B
			\|-
			\| 12
			\| s32
			\| Right Channel B
	\|}		\|}

2016-06-23T11:15:42Z

Output samples

← Older revision		Revision as of 15:15, 23 June 2016
Line 354:		Line 354:
	\| 0		\| 0
	\| s16[160][2]		\| s16[160][2]
	\| Samples		\| Samples (Stereo-output, 160 samples per channel)
	\|}		\|}