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5 API

IN THIS CHAPTER

· Custom Deﬁnes

· Required User Function Deﬁnitions

· Component API

5.1 Custom Deﬁnes

An application using the USB audio framework needs to have a deﬁnes ﬁle called

customdefines.h

This ﬁle can set the following deﬁnes:

5.1.1 System Feature Conﬁguration

Deﬁne Description Default

INPUT

Deﬁne for enabling audio input, in descrip-

tors, buﬀering and so on.

deﬁned

DFU

Deﬁne to enable DFU interface. Requires a

custom driver for Windows.

deﬁned

DFU_CUSTOM_FLASH_DEVICE

Deﬁne to enable use of custom ﬂash device

for DFU interface.

not deﬁned

MIDI Deﬁne to enable MIDI input and output. deﬁned

CODEC_SLAVE

If deﬁned the CODEC acts as I2S slave (and

the XCORE Tile as master) otherwise the

CODEC acts as master.

deﬁned

NUM_USB_CHAN_IN

Number of audio channels the USB audio

interface has from host to the device.

NUM_USB_CHAN_OUT

Number of audio channels the USB audio

interface has from device to host.

MAX_FREQ Maximum frequency device runs at in Hz 96000

I2S_CHANS_DAC

Number of I2S audio channels output to the

codec. This must be a multiple of 2.

I2S_CHANS_ADC

Number of I2S audio channels input from

the codec. This must be a multiple of 2.

SPDIF

Deﬁne to Enable S/PDIF output. If OUTPUT

is not deﬁned, zero-ed samples are emitted.

The S/PDIF audio channels will be two chan-

nels immediately following I2S_CHANS_DAC.

deﬁned

SPDIF_RX Deﬁne to enable S/PDIF input. not deﬁned

ADAT_RX Deﬁne to enable ADAT input. not deﬁned

(continued)

REV 6.1

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