MIC Services
Microphone service "mic:u"
| Command Header | Description |
|---|---|
| 0x00010042 | MapSharedMem |
| 0x00020000 | UnmapSharedMem |
| 0x00030140 | StartSampling |
| 0x00040040 | AdjustSampling |
| 0x00050000 | StopSampling |
| 0x00060000 | IsSampling |
| 0x00070000 | GetEventHandle. This event is signaled by MIC-module when more audio-data is available in shared-mem. |
| 0x00080040 | SetGain(u8 input). This is a wrapper for CDCMIC command 0x00010040. |
| 0x00090000 | GetGain. This is a wrapper for CDCMIC command 0x00020000. |
| 0x000A0040 | SetBias(u8 input). This is a wrapper for CDCMIC command 0x00030040. 0 = disable recording, 1 = enable recording. When recording is disabled with this, MIC-module writes value 0xFFFF to the output audio sample data in shared-mem, since that's what the MIC hardware returns here. |
| 0x000B0000 | GetBias. This is a wrapper for CDCMIC command 0x00040000. |
| 0x000C0042 | (size, <translate-header>, bufptr) This is a wrapper for CDCMIC command 0x00050042. |
| 0x000D0040 | SetClamp(u8 input) This writes the input value to a MIC-module state field. |
| 0x000E0000 | GetClamp. This writes the u8 value of the MIC-module field also used by command 0x000D0040, to cmdreply indexword[2]. |
| 0x000F0040 | (u8 input) This writes the input u8 value to a MIC-module state field. |
| 0x00100040 | When the input value is 0, value 1 is written to an u8 MIC module state field. Otherwise, value 0 is written there. Normally the input value is non-zero. |
This is an interface for using the MIC hardware via the "cdc:MIC" service and the MIC IO registers.
Only one session can be open for this service total(that is, only one process can use this service at a time).
enum Encoding
| Enum | Value |
|---|---|
| ENCODING_PCM8 | 0 |
| ENCODING_PCM16 | 1 |
| ENCODING_PCM8_SIGNED | 2 |
| ENCODING_PCM16_SIGNED | 3 |
enum SampleRate
| Enum | Value |
|---|---|
| SAMPLE_RATE_32730 | 0 |
| SAMPLE_RATE_16360 | 1 |
| SAMPLE_RATE_10910 | 2 |
| SAMPLE_RATE_8180 | 3 |