text: /****************************************************************************
   * boards/arm/stm32l4/nucleo-l432kc/src/stm32_pwm.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 <sys/types.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/board.h>
  #include <nuttx/timers/pwm.h>
  
  #include <arch/board/board.h>
  
  #include "chip.h"
  #include "arm_internal.h"
  #include "stm32l4_pwm.h"
  #include "nucleo-l432kc.h"
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  
  /* Configuration ************************************************************/
  
  /* PWM
   *
   * The nucleo-l432kc has no real on-board PWM devices, but the board can be
   * configured to output a pulse train using variously unused pins on the
   * board for PWM output (see board.h for details of pins).
   */
  
  #ifdef CONFIG_PWM
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name: stm32l4_pwm_setup
   *
   * Description:
   *   Initialize PWM and register the PWM device.
   *
   ****************************************************************************/
  
  int stm32l4_pwm_setup(void)
  {
    static bool initialized = false;
    struct pwm_lowerhalf_s *pwm;
    int ret;
  
    /* Have we already initialized? */
  
    if (!initialized)
      {
        /* Call stm32l4_pwminitialize() to get an instance of the PWM interface
         */
  
        /* PWM
         *
         * The Nucleo-l432kc has no real on-board PWM devices, but the board
         * can be configured to output a pulse train using TIM1 or 8, or others
         * (see board.h). Let's figure out which the user has configured.
         */
  
  #if defined(CONFIG_STM32L4_TIM1_PWM)
        pwm = stm32l4_pwminitialize(1);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm0" */
  
        ret = pwm_register("/dev/pwm0", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
  #if defined(CONFIG_STM32L4_TIM2_PWM)
        pwm = stm32l4_pwminitialize(2);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm1" */
  
        ret = pwm_register("/dev/pwm1", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
  #if defined(CONFIG_STM32L4_TIM15_PWM)
        pwm = stm32l4_pwminitialize(15);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm2" */
  
        ret = pwm_register("/dev/pwm2", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
  #if defined(CONFIG_STM32L4_TIM16_PWM)
        pwm = stm32l4_pwminitialize(16);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm3" */
  
        ret = pwm_register("/dev/pwm3", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
  #if defined(CONFIG_STM32L4_LPTIM1_PWM)
        pwm = stm32l4_lp_pwminitialize(1);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm4" */
  
        ret = pwm_register("/dev/pwm4", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
  #if defined(CONFIG_STM32L4_LPTIM2_PWM)
        pwm = stm32l4_lp_pwminitialize(2);
        if (!pwm)
          {
            aerr("ERROR: Failed to get the STM32L4 PWM lower half\n");
            return -ENODEV;
          }
  
        /* Register the PWM driver at "/dev/pwm5" */
  
        ret = pwm_register("/dev/pwm5", pwm);
        if (ret < 0)
          {
            aerr("ERROR: pwm_register failed: %d\n", ret);
            return ret;
          }
  #endif
  
        /* Now we are initialized */
  
        initialized = true;
      }
  
    return OK;
  }
  
  #endif /* CONFIG_PWM */
  