text: /****************************************************************************
   * boards/risc-v/esp32c3/esp32c3-devkit/src/esp32c3_i2c.c
   *
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.  The
   * ASF licenses this file to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance with the
   * License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
   * License for the specific language governing permissions and limitations
   * under the License.
   *
   ****************************************************************************/
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <debug.h>
  #include <errno.h>
  #include <sys/types.h>
  #include <nuttx/i2c/i2c_master.h>
  
  #include "esp32c3_i2c.h"
  #include "esp32c3-devkit.h"
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: board_i2c_init
   *
   * Description:
   *   Configure the I2C driver.
   *
   * Returned Value:
   *   Zero (OK) is returned on success; A negated errno value is returned
   *   to indicate the nature of any failure.
   *
   ****************************************************************************/
  
  int board_i2c_init(void)
  {
    int ret = OK;
  
  #ifdef CONFIG_ESP32C3_I2C0
    FAR struct i2c_master_s *i2c;
  
    i2c = esp32c3_i2cbus_initialize(0);
  
    if (i2c == NULL)
      {
        i2cerr("ERROR: Failed to get I2C0 interface\n");
        return -ENODEV;
      }
  
    ret = i2c_register(i2c, 0);
    if (ret < 0)
      {
        i2cerr("ERROR: Failed to register I2C0 driver: %d\n", ret);
        esp32c3_i2cbus_uninitialize(i2c);
      }
  #endif
  
    return ret;
  }
  
  