i2c.h

来自「MPC5200 BSP 支持ATA,USB, I2C,扩展网口」· C头文件 代码 · 共 40 行

#define I2C_RXTX_LEN	128	/* maximum tx/rx buffer length */

/*
 * Initialization, must be called once on start up, may be called
 * repeatedly to change the speed and slave addresses.
 */
extern void i2c_init(int speed, int slaveaddr);
#ifdef CFG_I2C_INIT_BOARD
void i2c_init_board(void);
#endif

/*
 * Probe the given I2C chip address.  Returns 0 if a chip responded,
 * not 0 on failure.
 */
int i2c_probe(unsigned char chip);

/*
 * Read/Write interface:
 *   chip:    I2C chip address, range 0..127
 *   addr:    Memory (register) address within the chip
 *   alen:    Number of bytes to use for addr (typically 1, 2 for larger
 *              memories, 0 for register type devices with only one
 *              register)
 *   buffer:  Where to read/write the data
 *   len:     How many bytes to read/write
 *
 *   Returns: 0 on success, not 0 on failure
 */
int i2c_read(unsigned char chip, unsigned int addr, int alen, unsigned char *buffer, int len);
int i2c_write(unsigned char chip, unsigned int addr, int alen, unsigned char *buffer, int len);

/*
 * Utility routines to read/write registers.
 */
unsigned char i2c_reg_read (unsigned char chip, unsigned char reg);
void  i2c_reg_write(unsigned char chip, unsigned char reg, unsigned char val);