Audio Device (ADC) Options

Audio Device (ADC) Options explains the configuration options for an audio device. The options can be edited in the file usb_config.c directly or using the µVision Configuration Wizard.

RL-USB ADC Configuration

Where

Audio Device (ADC) - enables the USB audio functionality of the device. This option corresponds to #define USBD_ADC_ENABLE.
```
#define USBD_ADC_ENABLE                1                    // 1=enabled; 0=disabled
```

Isochronous Endpoint Settings
configure the endpoint characteristics and affect Endpoint Descriptor.

Isochronous Out Endpoint Number sets the endpoint number. Values between 1..15 are allowed. This option corresponds to #define USBD_ADC_EP_ISOOUT.
```
#define USBD_ADC_EP_ISOOUT           0                    // value range 1..15
```
Maximum Endpoint Packet Size (in bytes) sets the maximal packet size. Values between 0..1024 are allowed. This option corresponds to #define USBD_ADC_WMAXPACKETSIZE.
```
#define USBD_ADC_WMAXPACKETSIZE      64                   // value range 0..1024
```
Endpoint polling Interval (in ms) sets the data transfer polling interval. Discrete values can be selected. This option corresponds to #define USBD_ADC_BINTERVAL.
```
#define USBD_ADC_BINTERVAL           1                    // value range 0..1024
```
High-speed enables the characteristics when using high speed transfer rates. Enable the High Speed option under USB Device. This option corresponds to #define USBD_ADC_HS_ENABLE.
```
#define USBD_ADC_HS_ENABLE           1                    // 1=enabled; 0=disabled
```
Maximum Endpoint Packet Size (in bytes) sets the maximal packet size for high speed transfers. Values between 0..1024 are allowed. This option corresponds to #define USBD_ADC_HS_WMAXPACKETSIZE.
```
#define USBD_ADC_HS_WMAXPACKETSIZE   64                   // next option also configures this macro
```
Additional transactions per microframe sets the additional transaction packets for high speed transfers. Discrete settings can be selected. This option also corresponds to #define USBD_ADC_HS_WMAXPACKETSIZE.
```
#define USBD_ADC_HS_WMAXPACKETSIZE   64                    // prev. option also configures this macro
```

Audio Device Settings
configure device specific options.

Audio Control Interface String sets the audio control string identifier. 126 characters are allowed. This option corresponds to #define USBD_ADC_CIF_STRDESC.
```
#define USBD_ADC_CIF_STRDESC         L"USB_ADC"           // up to 126 characters
```
Audio Streaming (Zero Bandwidth) Interface String sets the zero bandwidth streaming control string identifier. 126 characters are allowed. This option corresponds to #define USBD_ADC_SIF1_STRDESC.
```
#define USBD_ADC_SIF1_STRDESC        L"USB_ADC1"          // up to 126 characters
```
Audio Streaming (Operational) Interface String sets the operational streaming control string identifier. 126 characters are allowed. This option corresponds to #define USBD_ADC_SIF2_STRDESC.
```
#define USBD_ADC_SIF2_STRDESC        L"USB_ADC2"          // up to 126 characters
```
Audio Subframe Size (in bytes) sets the audio subframe size. Values between 0..255 are allowed. This option corresponds to #define USBD_ADC_BSUBFRAMESIZE.
```
#define USBD_ADC_BSUBFRAMESIZE       2                    // value range 0..255
```
Sample Resolution (in bits) sets the bit resolution size. Values between 0..255 are allowed. This option corresponds to #define USBD_ADC_BBITRESOLUTION.
```
#define USBD_ADC_BBITRESOLUTION      16                   // value range 0..255
```
Sample Frequency (in Hz) sets the sample frequency. Values between 0..16777215 are allowed. This option corresponds to #define USBD_ADC_TSAMFREQ.
```
#define USBD_ADC_TSAMFREQ            32000                // value range 0..16777215
```
Packet Size (in bytes) sets the size of data packets. Values between 1..256 are allowed. This option corresponds to #define USBD_ADC_CFG_P_S.
```
#define USBD_ADC_CFG_P_S             32                   // value range 1..256
```
Packet Count sets the number of data packets. Values between 1..16 are allowed. This option corresponds to #define USBD_ADC_CFG_P_C.
```
#define USBD_ADC_CFG_P_C             1                    // value range 1..16
```

Note

The USB Device Controller hardware might impose restrictions on the use of endpoints.
Refer to Create ADC Applications for a quick-start on programming an audio device.

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