1.1.2.6.13 DRV_AK4954_VolumeSet Function
void DRV_AK4954_VolumeSet(DRV_HANDLE handle, DRV_AK4954_CHANNEL channel, uint8_t volume);Summary
This function sets the volume for AK4954 Codec.
Description
This functions sets the volume value from 0-255.
The codec has DAC value to volume range mapping as :- 00 H : +12dB FF H : -115dB
In order to make the volume value to dB mapping monotonically increasing from 00 to FF, re-mapping is introduced which reverses the volume value to dB mapping as well as normalizes the volume range to a more audible dB range.
The current driver implementation assumes that all dB values under -60 dB are inaudible to the human ear.
Re-Mapped values 00 H : -60 dB FF H : +12 dB
Preconditions
The DRV_AK4954_Initialize routine must have been called for the specified AK4954 driver instance.
DRV_AK4954_Open must have been called to obtain a valid opened device handle.
Parameters
| Parameters | Description |
|---|---|
| handle | A valid open-instance handle, returned from the driver's open routine |
| chan | Audio channel volume to be set |
| volume | volume value specified in the range 0-255 (0x00 to 0xFF) |
Returns
None.
Remarks
None.
Example
_\/\/ myAppObj is an application specific object._
MY_APP_OBJ myAppObj;
uint8_t mybuffer[MY_BUFFER_SIZE]; DRV_BUFFER_HANDLE bufferHandle;
_\/\/ myAK4954Handle is the handle returned \/\/ by the DRV_AK4954_Open function._
DRV_AK4954_VolumeSet(myAK4954Handle, DRV_AK4954_CHANNEL_LEFT, 120);C
void DRV_AK4954_VolumeSet(DRV_HANDLE handle, DRV_AK4954_CHANNEL channel, uint8_t volume);