CSND Registers
0x1EC03400
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. |