include/hw/i2c/bitbang_i2c.h

   1 #ifndef BITBANG_I2C_H
   2 #define BITBANG_I2C_H
   3
   4 #include "hw/i2c/i2c.h"
   5
   6 typedef struct bitbang_i2c_interface bitbang_i2c_interface;
   7
   8 #define BITBANG_I2C_SDA 0
   9 #define BITBANG_I2C_SCL 1
  10
  11 typedef enum bitbang_i2c_state {
  12     STOPPED = 0,
  13     SENDING_BIT7,
  14     SENDING_BIT6,
  15     SENDING_BIT5,
  16     SENDING_BIT4,
  17     SENDING_BIT3,
  18     SENDING_BIT2,
  19     SENDING_BIT1,
  20     SENDING_BIT0,
  21     WAITING_FOR_ACK,
  22     RECEIVING_BIT7,
  23     RECEIVING_BIT6,
  24     RECEIVING_BIT5,
  25     RECEIVING_BIT4,
  26     RECEIVING_BIT3,
  27     RECEIVING_BIT2,
  28     RECEIVING_BIT1,
  29     RECEIVING_BIT0,
  30     SENDING_ACK,
  31     SENT_NACK
  32 } bitbang_i2c_state;
  33
  34 struct bitbang_i2c_interface {
  35     I2CBus *bus;
  36     bitbang_i2c_state state;
  37     int last_data;
  38     int last_clock;
  39     int device_out;
  40     uint8_t buffer;
  41     int current_addr;
  42 };
  43
  44 /**
  45  * bitbang_i2c_init: in-place initialize the bitbang_i2c_interface struct
  46  */
  47 void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
  48 int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
  49
  50 #endif