Двухпроводной интерфейс: список регистров

  Unused

  SCL_STATE

Current State of TWI_SCL
0: Low
1: High

  SDA_STATE

Current State of TWI_SDAж
0 : Low
1 : High

  SCL_CTL

TWI_SCL Line State Control Bit
When line control mode is enabled (bit[2] set), this bit decides the output
level of TWI_SCL.
0: Output low level
1: Output high level

  SCL_CTL_EN

TWI_SCL Line State Control Enable
When this bit is set, the state of TWI_SCL is controlled by the value of bit[3].
0: Disable TWI_SCL line control mode
1: Enable TWI_SCL line control mode

  SDA_CTL

TWI_SDA Line State Control Bit
When line control mode is enabled (bit[0] set), this bit decides the output
level of TWI_SDA.
0: Output low level
1: Output high level

  SDA_CTL_EN

TWI_SDA Line State Control Enable
When this bit is set, the state of TWI_SDA is controlled by the value of bit[1].
0: Disable TWI_SDA line control mode
1: Enable TWI_SDA line control mode

Команда U-Boot для чтения регистра

Bit fields structure

typedef union  twi_lcr
{
  struct
  {
   unsigned sda_ctl_en : 1;
   unsigned sda_ctl : 1;
   unsigned scl_ctl_en : 1;
   unsigned scl_ctl : 1;
   unsigned sda_state : 1;
   unsigned scl_state : 1;
   unsigned unused0 : 26;
  } b;
   unsigned long w;
} TWI_LCR