text: /****************************************************************************
   * boards/arm/stm32h7/nucleo-h743zi/src/stm32_pca9635.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 <stdbool.h>
  #include <stdio.h>
  #include <debug.h>
  #include <errno.h>
  
  #include <nuttx/i2c/i2c_master.h>
  #include <nuttx/leds/pca9635pw.h>
  
  #include <arch/irq.h>
  
  #include "stm32.h"
  #include "my-h743ii.h"
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32_pca9635_initialize
   *
   * Description:
   *   This function is called by board initialization logic to configure the
   *   LED PWM chip.  This function will register the driver as /dev/leddrv0.
   *
   * Input Parameters:
   *   None
   *
   * Returned Value:
   *   Zero is returned on success.  Otherwise, a negated errno value is
   *   returned to indicate the nature of the failure.
   *
   ****************************************************************************/
  
  int stm32_pca9635_initialize(void)
  {
    FAR struct i2c_master_s *i2c;
    int ret;
  
    /* Get the I2C driver that interfaces with the pca9635 */
  
    i2c = stm32_i2cbus_initialize(PCA9635_I2CBUS);
    if (!i2c)
      {
        i2cerr("ERROR: Failed to initialize I2C%d\n", PCA9635_I2CBUS);
        return -1;
      }
  
    ret = pca9635pw_register("/dev/leddrv0", i2c, PCA9635_I2CADDR);
    if (ret < 0)
      {
        snerr("ERROR: Failed to register PCA9635 driver: %d\n", ret);
        return ret;
      }
  
    return OK;
  }
  