CSND Registers

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0x1EC03000[edit]

See DSP Registers.

0x1EC03400[edit]

The channel registers are based at 0x1EC03400(process virtual address). There's 0x20-bytes total for each channel slot, thus the base-address for a channel's slot is determined with: 0x1EC03400 + (channel_index*0x20). The below offsets are relative to these channel register slots.

Relative offset Size Description
0x0 2 REG_CSNDCHANX_CNT. For Type0 Cmd 0xE, CSND module basically writes this value here: u16 (cmdword[2] & 0xFFFF).
0x2 2 For Type0 Cmd 0xE, CSND module writes this value here: 0 - (cmdword[2]>>16).
0x4 2 For Type0 Cmd 0xE, CSND module writes value 0 here.
0x6 2 For Type0 Cmd 0xE, CSND module writes value 0 here.
0x8 2 For Type0 Cmd 0xE, CSND module writes this value here: (u16)cmdword[4].
0xA 2 For Type0 Cmd 0xE, CSND module writes this value here: cmdword[4]>>16.
0xC 4 This is the audio data physical address, for the main channel.
0x10 4 This is the audio data total byte-size. The CSND module masks the size loaded from the Type0 command-data with value 0x7FFFFFF, which is then used when writing these registers.
0x14 4 This is the audio data physical address, for the second channel. When this is not 0x0 stereo audio is used, otherwise mono audio is used.
0x18 4 When CSND module handles type0 Cmd 0xE with encoding!=IMA-ADPCM, CSND module sets this to zero. This register can be initialized via CSND module type0 Cmd 0xB.
0x1C 4 CSND module writes value zero here immediately after it writes to chanslotreg+0x18.