Регистры Allwinner H616
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AC_DAC_FIFOS
8.4.5. DAC FIFO Status Register - адрес: 0x5096014 (смещение: 0x0014)

Аудиокодек: список регистров

  Unused

Bits 31 : 24

  TX_EMPTY

Bit 23
R
0x1

TX FIFO Empty
0: No room for new sample in TX FIFO
1: More than one room for new sample in TX FIFO (>= 1 word)

  TXE_CNT

Bits 22 : 8
R
0x80

TX FIFO Empty Space Word Counter

  Unused

Bits 7 : 4

  TXE_INT

Bit 3
R/W1C
0x1

TX FIFO Empty Pending Interrupt
0: No Pending IRQ
1: FIFO Empty Pending Interrupt
Write 1 to clear this interrupt or automatically clear if interrupt condition fails.

  TXU_INT

Bit 2
R/W1C
0x0

TX FIFO Underrun Pending Interrupt
0: No Pending Interrupt
1: FIFO Underrun Pending Interrupt
Write 1 to clear this interrupt

  TXO_INT

Bit 1
R/W1C
0x0

TX FIFO Overrun Pending Interrupt
0: No Pending Interrupt
1: FIFO Overrun Pending Interrupt
Write 1 to clear this interrupt

  Unused

Bit 0

Команда U-Boot для чтения регистра

md 5096014 1

Bit fields structure 

typedef union  ac_dac_fifos
{
  struct
  {
   unsigned unused0 : 1;
   unsigned txo_int : 1;
   unsigned txu_int : 1;
   unsigned txe_int : 1;
   unsigned unused1 : 4;
   unsigned txe_cnt : 15;
   unsigned tx_empty : 1;
   unsigned unused2 : 8;
  } b;
   unsigned long w;
} AC_DAC_FIFOS
Allwinner H616 Manual