Регистры Allwinner H616
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TVE_DAC_CFG1
7.2.5. TV Encoder DAC CFG1 Register - адрес: 0x652002c 0x652402c (смещение: 0x002C)

ТВ-кодер: список регистров

  Unused

Bits 31 : 10

  REF_EXT_SEL

Bit 9
R/W
0x1

0: disable
1: enable
(A_SEL_DETREF_LDO)

  REF_INT_SEL

Bit 8
R/W
0x0

0: disable
1: enable
(A_SEL_DETREF_RES)

  Unused

Bits 7 : 6

  REF2_SEL

Bits 5 : 4
R/W
0x3

00: 0.25V
01: 0.30V
10: 0.35V
11: 0.40V
(a_refslct2<1:0>)

  REF1_SEL

Bits 3 : 0
R/W
0xA

0000: 0.50V
0001: 0.55V
0010: 0.60V
0011: 0.65V
0100: 0.70V
0101: 0.75V
0110: 0.80V
0111: 0.85V

1000: 0.90V
1001: 0.95V
1010: 1.00V
1011: 1.05V
1100: 1.10V
1101: 1.15V
1110: 1.20V
1111: 1.25V
(a_refslct1<3:0>)
The reference voltage is used for hot plug detect function.

Команда U-Boot для чтения регистра

md 652002c 1
md 652402c 1

Bit fields structure 

typedef union  tve_dac_cfg1
{
  struct
  {
   unsigned ref1_sel : 4;
   unsigned ref2_sel : 2;
   unsigned unused0 : 2;
   unsigned ref_int_sel : 1;
   unsigned ref_ext_sel : 1;
   unsigned unused1 : 22;
  } b;
   unsigned long w;
} TVE_DAC_CFG1
Allwinner H616 Manual