/*-----------------------------------------------------------------------
* Local functions
*/
-#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
static void send_reset (void);
-#endif
static void send_start (void);
static void send_stop (void);
static void send_ack (int);
static int write_byte (uchar byte);
static uchar read_byte (int);
-#if !defined(CONFIG_SYS_I2C_INIT_BOARD)
/*-----------------------------------------------------------------------
* Send a reset sequence consisting of 9 clocks with the data signal high
* to clock any confused device back into an idle state. Also send a
send_stop();
I2C_TRISTATE;
}
-#endif
/*-----------------------------------------------------------------------
* START: High -> Low on SDA while SCL is High
*/
static void soft_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
{
-#if defined(CONFIG_SYS_I2C_INIT_BOARD)
- /* call board specific i2c bus reset routine before accessing the */
- /* environment, which might be in a chip on that bus. For details */
- /* about this problem see doc/I2C_Edge_Conditions. */
- i2c_init_board();
-#else
/*
* WARNING: Do NOT save speed in a static variable: if the
* I2C routines are called before RAM is initialized (to read
* system will crash.
*/
send_reset ();
-#endif
}
/*-----------------------------------------------------------------------