text: /*
   * Copyright (c) 2020 Bouffalolab.
   *
   * This file is part of
   *     *** Bouffalolab Software Dev Kit ***
   *      (see www.bouffalolab.com).
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *   1. Redistributions of source code must retain the above copyright notice,
   *      this list of conditions and the following disclaimer.
   *   2. Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *   3. Neither the name of Bouffalo Lab nor the names of its contributors
   *      may be used to endorse or promote products derived from this software
   *      without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  #ifndef __BL_I2C_H__
  #define __BL_I2C_H__
  #include <stdint.h>
  
  #define I2C_M_READ 1
  #define I2C_M_WRITE 0
  #define I2C_M_BLOCK 0
  #define I2C_M_NO_BLOCK 1
  
  typedef struct i2c_msg {
    uint16_t addr;
    uint8_t direct;
    uint8_t subflag;
    uint32_t subaddr;
    uint8_t sublen;
    uint32_t len;
    uint8_t *buf;
    int event;
    int idex;
    int block;
    int stop;
    int ins_num;
    int i2cx;
  } i2c_msg_t;
  
  void i2c_set_freq(int freq, int i2cx);
  void i2c_gpio_init(int i2cx);
  void i2c_clear_status(int i2cx);
  void do_write_data(i2c_msg_t *pstmsg);
  void do_read_data(i2c_msg_t *pstmsg);
  void i2c_transfer_start(i2c_msg_t *pstmsg);
  
  #endif
  