Аудио-концентратор: список регистров

  Unused

  LRCK_WIDTH

(Only apply in PCM mode) LRCK width
0: LRCK = 1 BCLK width (short frame)
1: LRCK = 2 BCLK width (long frame)

  Unused

  LRCK_POLARITY

When apply in I2S/Left-Justified/Right-Justified mode:
0: Left channel when LRCK is low
1: Left channel when LRCK is high
When apply in PCM mode:
0: PCM LRCK asserted at the negative edge
1: PCM LRCK asserted at the positive edge

  Unused

  LRCK_PERIOD

It is used to program the number of BCLKs per channel of sample
frame. This value is interpreted as follow:
PCM Mode: Number of BCLKs within (Left + Right) channel width.
I2S/Left-Justified/Right-Justified Mode: Number of BCLKs within each
individual channel width(Left or Right)
For example:
N = 7 : 8 BCLKs width
***
N = 1023 : 1024 BCLKs width

  BCLK_POLARITY

0: Normal mode, negative edge drive and positive edge sample
1: Invert mode, positive edge drive and negative edge sample

  SR_

Sample Resolution
000: Reserved
001: 8-bit
010: 12-bit
011: 16-bit
100: 20-bit
101: 24-bit
110: 28-bit
111: 32-bit

  EDGE_TRANSFER

0: SDO drive data and SDI sample data at the different BCLK edge
1: SDO drive data and SDI sample data at the sample BCLK edge
BCLK_PLARITY = 0, use negative edge
BCLK_PLARITY = 1, use positive edge

  SW_

Slot Width Select
000: Reserved
001: 8-bit
010: 12-bit
011: 16-bit
100: 20-bit
101: 24-bit
110: 28-bit
111: 32-bit

Команда U-Boot для чтения регистра

Bit fields structure

typedef union  i2sn_fmt0
{
  struct
  {
   unsigned sw_ : 3;
   unsigned edge_transfer : 1;
   unsigned sr_ : 3;
   unsigned bclk_polarity : 1;
   unsigned lrck_period : 10;
   unsigned unused0 : 1;
   unsigned lrck_polarity : 1;
   unsigned unused1 : 10;
   unsigned lrck_width : 1;
   unsigned unused2 : 1;
  } b;
   unsigned long w;
} I2Sn_FMT0