XMOS xCORE-200 Multi-channel Audio board, Руководство по конструкции

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USB Audio Design Guide 37/110
The following code snippet illustrates how the output of the S/PDIF receive compo-
nent could be used:
w h i l e (1)
{
c _ s p d i f _ r x : > d a t a ;
if ( b a d P a r i t y ( d a t a )
c o n t i n u e ;
tag = d a t a & 0 xF ;
/* E x t r a c t 24 bit a u d i o s a m p l e */
s a m p l e = ( d a t a < < 4) & 0 x F F F F F F 0 0 ;
s w i t c h ( tag )
{
c a s e F R A M E _ X :
c a s e F R A M E _ X :
// S t o r e l e f t
b r e a k ;
c a s e F R A M E _ Z :
// S t o r e r i g h t
b r e a k ;
}
}
3.9 ADAT Receive
The ADAT receive component receives up to eight channels of audio at a sample
rate of 44.1kHz or 48kHz. The API for calling the receiver functions is described in
§
7.3 .
The component outputs 32 bits words split into nine word frames. The frames are
laid out in the following manner:
· Control byte
· Channel 0 sample
·
Channel 1 sample
· Channel 2 sample
· Channel 3 sample
· Channel 4 sample
· Channel 5 sample
· Channel 6 sample
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