LXR qemu/include/hw/i2c/bitbang

   1#ifndef BITBANG_I2C_H
   2#define BITBANG_I2C_H
   3
   4#include "hw/i2c/i2c.h"
   5
   6typedef struct bitbang_i2c_interface bitbang_i2c_interface;
   7
   8#define BITBANG_I2C_SDA 0
   9#define BITBANG_I2C_SCL 1
  10
  11typedef 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
  34struct 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 */
  47void bitbang_i2c_init(bitbang_i2c_interface *s, I2CBus *bus);
  48int bitbang_i2c_set(bitbang_i2c_interface *i2c, int line, int level);
  49
  50#endif
  51