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 #define TYPE_GPIO_I2C "gpio_i2c"
   7
   8 typedef struct bitbang_i2c_interface bitbang_i2c_interface;
   9
  10 #define BITBANG_I2C_SDA 0
  11 #define BITBANG_I2C_SCL 1
  12
  13 typedef enum bitbang_i2c_state {
  14     STOPPED = 0,
  15     SENDING_BIT7,
  16     SENDING_BIT6,
  17     SENDING_BIT5,
  18     SENDING_BIT4,
  19     SENDING_BIT3,
  20     SENDING_BIT2,
  21     SENDING_BIT1,
  22     SENDING_BIT0,
  23     WAITING_FOR_ACK,
  24     RECEIVING_BIT7,
  25     RECEIVING_BIT6,
  26     RECEIVING_BIT5,
  27     RECEIVING_BIT4,
  28     RECEIVING_BIT3,
  29     RECEIVING_BIT2,
  30     RECEIVING_BIT1,
  31     RECEIVING_BIT0,
  32     SENDING_ACK,
  33     SENT_NACK
  34 } bitbang_i2c_state;
  35
  36 struct bitbang_i2c_interface {
  37     I2CBus *bus;
  38     bitbang_i2c_state state;
  39     int last_data;
  40     int last_clock;
  41     int device_out;
  42     uint8_t buffer;
  43     int current_addr;
  44 };
  45
  46 /**
  47  * bitbang_i2c_init: in-place initialize the bitbang_i2c_interface struct
  48  */
  49 void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
  50 int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
  51
  52 #endif