text: /************************************************************************************
   * configs/stm32f4discovery/src/stm32_rgbled.c
   *
   *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
   *   Author: Alan Carvalho de Assis <acassis@gmail.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 NuttX 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 OWNER 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.
   *
   ************************************************************************************/
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/pwm.h>
  #include <nuttx/leds/rgbled.h>
  #include <arch/board/board.h>
  
  #include "chip.h"
  #include "up_arch.h"
  #include "stm32_pwm.h"
  #include "stm32f4discovery.h"
  
  /************************************************************************************
   * Pre-processor Definitions
   ************************************************************************************/
  /* Configuration ********************************************************************/
  
  #define HAVE_RGBLED 1
  
  #ifndef CONFIG_PWM
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM1
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM2
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM3
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM1_PWM
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM2_PWM
  #  undef HAVE_RGBLED
  #endif
  
  #ifndef CONFIG_STM32_TIM3_PWM
  #  undef HAVE_RGBLED
  #endif
  
  #ifdef HAVE_RGBLED
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  /************************************************************************************
   * Name: board_pwm_setup
   *
   * Description:
   *   All STM32 architectures must provide the following interface to work with
   *   examples/pwm.
   *
   ************************************************************************************/
  
  int stm32_rgbled_setup(void)
  {
    static bool initialized = false;
    struct pwm_lowerhalf_s    *ledr;
    struct pwm_lowerhalf_s    *ledg;
    struct pwm_lowerhalf_s    *ledb;
    struct pwm_info_s info;
    int ret;
  
    /* Have we already initialized? */
  
    if (!initialized)
      {
        /* Call stm32_pwminitialize() to get an instance of the PWM interface */
  
        ledr = stm32_pwminitialize(1);
        if (!ledr)
          {
            lederr("ERROR: Failed to get the STM32 PWM lower half to LEDR\n");
            return -ENODEV;
          }
  
        /* Define frequency and duty cycle */
  
        info.frequency = 100;
        info.duty = 0;
  
        /* Initialize LED R */
  
        ledr->ops->setup(ledr);
        ledr->ops->start(ledr, &info);
  
        /* Call stm32_pwminitialize() to get an instance of the PWM interface */
  
        ledg = stm32_pwminitialize(2);
        if (!ledg)
          {
            lederr("ERROR: Failed to get the STM32 PWM lower half to LEDG\n");
            return -ENODEV;
          }
  
        /* Initialize LED G */
  
        ledg->ops->setup(ledg);
        ledg->ops->start(ledg, &info);
  
        /* Call stm32_pwminitialize() to get an instance of the PWM interface */
  
        ledb = stm32_pwminitialize(3);
        if (!ledb)
          {
            lederr("ERROR: Failed to get the STM32 PWM lower half to LEDB\n");
            return -ENODEV;
          }
  
        /* Initialize LED B */
  
        ledb->ops->setup(ledb);
        ledb->ops->start(ledb, &info);
  
        /* Register the RGB LED diver at "/dev/rgbled0" */
  
        ret = rgbled_register("/dev/rgbled0", ledr, ledg, ledb);
        if (ret < 0)
          {
            lederr("ERROR: rgbled_register failed: %d\n", ret);
            return ret;
          }
  
        /* Now we are initialized */
  
        initialized = true;
      }
  
    return OK;
  }
  
  #else
  #  error "HAVE_RGBLED is undefined"
  #endif /* HAVE_RGBLED */
  