nuttx/arch/arm/src/stm32/stm32_tim.c

/************************************************************************************
 * arm/arm/src/stm32/stm32_tim.c
 *
 *   Copyright (C) 2011 Uros Platise. All rights reserved.
 *   Author: Uros Platise <uros.platise@isotel.eu>
 *
 * With modifications and updates by:
 *
 *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * 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 <nuttx/arch.h>
#include <nuttx/irq.h>

#include <sys/types.h>
#include <stdint.h>
#include <stdbool.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>

#include <arch/board/board.h>

#include "chip.h"
#include "up_internal.h"
#include "up_arch.h"

#include "stm32_internal.h"
#include "stm32_gpio.h"
#include "stm32_tim.h"

/************************************************************************************
 * Private Types
 ************************************************************************************/
/* Configuration ********************************************************************/
/* Timer devices may be used for different purposes.  Such special purposes include:
 *
 * - To generate modulated outputs for such things as motor control.  If CONFIG_STM32_TIMn
 *   is defined then the CONFIG_STM32_TIMn_PWM may also be defined to indicate that
 *   the timer is intended to be used for pulsed output modulation.
 *
 * - To control periodic ADC input sampling.  If CONFIG_STM32_TIMn is defined then
 *   CONFIG_STM32_TIMn_ADC may also be defined to indicate that timer "n" is intended
 *   to be used for that purpose.
 *
 * - To control periodic DAC outputs.  If CONFIG_STM32_TIMn is defined then
 *   CONFIG_STM32_TIMn_DAC may also be defined to indicate that timer "n" is intended
 *   to be used for that purpose.
 *
 * - To use a Quadrature Encoder.  If CONFIG_STM32_TIMn is defined then
 *   CONFIG_STM32_TIMn_QE may also be defined to indicate that timer "n" is intended
 *   to be used for that purpose.
 *
 * In any of these cases, the timer will not be used by this timer module.
 */

#if defined(CONFIG_STM32_TIM1_PWM) || defined (CONFIG_STM32_TIM1_ADC) || \
    defined(CONFIG_STM32_TIM1_DAC) || defined(CONFIG_STM32_TIM1_QE)
#  undef CONFIG_STM32_TIM1
#endif
#if defined(CONFIG_STM32_TIM2_PWM) || defined (CONFIG_STM32_TIM2_ADC) || \
    defined(CONFIG_STM32_TIM2_DAC) || defined(CONFIG_STM32_TIM2_QE)
#  undef CONFIG_STM32_TIM2
#endif
#if defined(CONFIG_STM32_TIM3_PWM) || defined (CONFIG_STM32_TIM3_ADC) || \
    defined(CONFIG_STM32_TIM3_DAC) || defined(CONFIG_STM32_TIM3_QE)
#  undef CONFIG_STM32_TIM3
#endif
#if defined(CONFIG_STM32_TIM4_PWM) || defined (CONFIG_STM32_TIM4_ADC) || \
    defined(CONFIG_STM32_TIM4_DAC) || defined(CONFIG_STM32_TIM4_QE)
#  undef CONFIG_STM32_TIM4
#endif
#if defined(CONFIG_STM32_TIM5_PWM) || defined (CONFIG_STM32_TIM5_ADC) || \
    defined(CONFIG_STM32_TIM5_DAC) || defined(CONFIG_STM32_TIM5_QE)
#  undef CONFIG_STM32_TIM5
#endif
#if defined(CONFIG_STM32_TIM6_PWM) || defined (CONFIG_STM32_TIM6_ADC) || \
    defined(CONFIG_STM32_TIM6_DAC) || defined(CONFIG_STM32_TIM6_QE)
#  undef CONFIG_STM32_TIM6
#endif
#if defined(CONFIG_STM32_TIM7_PWM) || defined (CONFIG_STM32_TIM7_ADC) || \
    defined(CONFIG_STM32_TIM7_DAC) || defined(CONFIG_STM32_TIM7_QE)
#  undef CONFIG_STM32_TIM7
#endif
#if defined(CONFIG_STM32_TIM8_PWM) || defined (CONFIG_STM32_TIM8_ADC) || \
    defined(CONFIG_STM32_TIM8_DAC) || defined(CONFIG_STM32_TIM8_QE)
#  undef CONFIG_STM32_TIM8
#endif
#if defined(CONFIG_STM32_TIM9_PWM) || defined (CONFIG_STM32_TIM9_ADC) || \
    defined(CONFIG_STM32_TIM9_DAC) || defined(CONFIG_STM32_TIM9_QE)
#  undef CONFIG_STM32_TIM9
#endif
#if defined(CONFIG_STM32_TIM10_PWM) || defined (CONFIG_STM32_TIM10_ADC) || \
    defined(CONFIG_STM32_TIM10_DAC) || defined(CONFIG_STM32_TIM10_QE)
#  undef CONFIG_STM32_TIM10
#endif
#if defined(CONFIG_STM32_TIM11_PWM) || defined (CONFIG_STM32_TIM11_ADC) || \
    defined(CONFIG_STM32_TIM11_DAC) || defined(CONFIG_STM32_TIM11_QE)
#  undef CONFIG_STM32_TIM11
#endif
#if defined(CONFIG_STM32_TIM12_PWM) || defined (CONFIG_STM32_TIM12_ADC) || \
    defined(CONFIG_STM32_TIM12_DAC) || defined(CONFIG_STM32_TIM12_QE)
#  undef CONFIG_STM32_TIM12
#endif
#if defined(CONFIG_STM32_TIM13_PWM) || defined (CONFIG_STM32_TIM13_ADC) || \
    defined(CONFIG_STM32_TIM13_DAC) || defined(CONFIG_STM32_TIM13_QE)
#  undef CONFIG_STM32_TIM13
#endif
#if defined(CONFIG_STM32_TIM14_PWM) || defined (CONFIG_STM32_TIM14_ADC) || \
    defined(CONFIG_STM32_TIM14_DAC) || defined(CONFIG_STM32_TIM14_QE)
#  undef CONFIG_STM32_TIM14
#endif

/* This module then only compiles if there are enabled timers that are not intended for
 * some other purpose.
 */

#if defined(CONFIG_STM32_TIM1) || defined(CONFIG_STM32_TIM2) || defined(CONFIG_STM32_TIM3) || \
    defined(CONFIG_STM32_TIM4) || defined(CONFIG_STM32_TIM5) || defined(CONFIG_STM32_TIM6) || \
    defined(CONFIG_STM32_TIM7) || defined(CONFIG_STM32_TIM8)

/************************************************************************************
 * Private Types
 ************************************************************************************/

/* TIM Device Structure */

struct stm32_tim_priv_s
{
  struct stm32_tim_ops_s *ops;
  stm32_tim_mode_t        mode;
  uint32_t                base;   /* TIMn base address */
};

/************************************************************************************
 * Private Functions
 ************************************************************************************/

/* Get a 16-bit register value by offset */

static inline uint16_t stm32_getreg16(FAR struct stm32_tim_dev_s *dev, uint8_t offset)
{
  return getreg16(((struct stm32_tim_priv_s *)dev)->base + offset);
}

/* Put a 16-bit register value by offset */

static inline void stm32_putreg16(FAR struct stm32_tim_dev_s *dev, uint8_t offset, uint16_t value)
{
  putreg16(value, ((struct stm32_tim_priv_s *)dev)->base + offset);
}

/* Modify a 16-bit register value by offset */

static inline void stm32_modifyreg16(FAR struct stm32_tim_dev_s *dev, uint8_t offset, uint16_t clearbits, uint16_t setbits)
{
  modifyreg16(((struct stm32_tim_priv_s *)dev)->base + offset, clearbits, setbits);
}

/* Get a 32-bit register value by offset.  This applies only for the STM32 F4
 * 32-bit registers (CNT, ARR, CRR1-4) in the 32-bit timers TIM2-5.
 */

static inline uint32_t stm32_getreg32(FAR struct stm32_tim_dev_s *dev, uint8_t offset)
{
  return getreg32(((struct stm32_tim_priv_s *)dev)->base + offset);
}

/* Put a 32-bit register value by offset.  This applies only for the STM32 F4
 * 32-bit registers (CNT, ARR, CRR1-4) in the 32-bit timers TIM2-5.
 */

static inline void stm32_putreg32(FAR struct stm32_tim_dev_s *dev, uint8_t offset, uint32_t value)
{
  putreg32(value, ((struct stm32_tim_priv_s *)dev)->base + offset);
}

static void stm32_tim_reload_counter(FAR struct stm32_tim_dev_s *dev)
{
  uint16_t val = stm32_getreg16(dev, STM32_BTIM_EGR_OFFSET);
  val |= ATIM_EGR_UG;
  stm32_putreg16(dev, STM32_BTIM_EGR_OFFSET, val);
}

static void stm32_tim_enable(FAR struct stm32_tim_dev_s *dev)
{
  uint16_t val = stm32_getreg16(dev, STM32_BTIM_CR1_OFFSET);
  val |= ATIM_CR1_CEN;
  stm32_tim_reload_counter(dev);
  stm32_putreg16(dev, STM32_BTIM_CR1_OFFSET, val);
}

static void stm32_tim_disable(FAR struct stm32_tim_dev_s *dev)
{
  uint16_t val = stm32_getreg16(dev, STM32_BTIM_CR1_OFFSET);
  val &= ~ATIM_CR1_CEN;
  stm32_putreg16(dev, STM32_BTIM_CR1_OFFSET, val);
}

/* Reset timer into system default state, but do not affect output/input pins */
static void stm32_tim_reset(FAR struct stm32_tim_dev_s *dev)
{
  ((struct stm32_tim_priv_s *)dev)->mode = STM32_TIM_MODE_DISABLED;
  stm32_tim_disable(dev);
}

static void stm32_tim_gpioconfig(uint32_t cfg, stm32_tim_channel_t mode)
{
  /* TODO: Add support for input capture and bipolar dual outputs for TIM8 */

  if (mode & STM32_TIM_CH_MODE_MASK)
    {
      stm32_configgpio(cfg);
    }
  else
    {
      stm32_unconfiggpio(cfg);
    }
}

/************************************************************************************
 * Basic Functions
 ************************************************************************************/

static int stm32_tim_setclock(FAR struct stm32_tim_dev_s *dev, uint32_t freq)
{
  int prescaler;

  ASSERT(dev);

  /* Disable Timer? */

  if (freq == 0)
    {
      stm32_tim_disable(dev);
      return 0;
    }

#if STM32_NATIM > 0
  if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM1_BASE ||
      ((struct stm32_tim_priv_s *)dev)->base == STM32_TIM8_BASE)
    {
      prescaler = STM32_TIM18_FREQUENCY / freq;
    }
  else
#endif
    {
      prescaler = STM32_TIM27_FREQUENCY / freq;
    }

  /* We need to decrement value for '1', but only, if we are allowed to
   * not to cause underflow. Check for overflow.
   */

  if (prescaler > 0)
    {
      prescaler--;
    }

  if (prescaler > 0xffff)
    {
      prescaler = 0xffff;
    }

  stm32_putreg16(dev, STM32_BTIM_PSC_OFFSET, prescaler);
  stm32_tim_enable(dev);

  return prescaler;
}

static void stm32_tim_setperiod(FAR struct stm32_tim_dev_s *dev, uint32_t period)
{
  ASSERT(dev);
  stm32_putreg32(dev, STM32_BTIM_ARR_OFFSET, period);
}

static int stm32_tim_setisr(FAR struct stm32_tim_dev_s *dev, int (*handler)(int irq, void *context), int source)
{
  int vectorno;

  ASSERT(dev);
  ASSERT(source==0);

  switch (((struct stm32_tim_priv_s *)dev)->base)
    {
#if CONFIG_STM32_TIM2
      case STM32_TIM2_BASE:
        vectorno = STM32_IRQ_TIM2;
        break;
#endif
#if CONFIG_STM32_TIM3
      case STM32_TIM3_BASE:
        vectorno = STM32_IRQ_TIM3;
        break;
#endif
#if CONFIG_STM32_TIM4
      case STM32_TIM4_BASE:
        vectorno = STM32_IRQ_TIM4;
        break;
#endif
#if CONFIG_STM32_TIM5
      case STM32_TIM5_BASE:
        vectorno = STM32_IRQ_TIM5;
        break;
#endif
#if STM32_NBTIM > 0
#if CONFIG_STM32_TIM6
      case STM32_TIM6_BASE:
        vectorno = STM32_IRQ_TIM6;
        break;
#endif
#endif
#if STM32_NBTIM > 1
#if CONFIG_STM32_TIM7
      case STM32_TIM7_BASE:
        vectorno = STM32_IRQ_TIM7;
        break;
#endif
#endif
#if STM32_NATIM > 0
      /* TODO: add support for multiple sources and callbacks */
#if CONFIG_STM32_TIM1
      case STM32_TIM1_BASE:
        vectorno = STM32_IRQ_TIM1UP;
        break;
#endif
#if CONFIG_STM32_TIM8
      case STM32_TIM8_BASE:
        vectorno = STM32_IRQ_TIM8UP;
        break;
#endif
#endif
      default:
        return ERROR;
    }

  /* Disable interrupt when callback is removed */

  if (!handler)
    {
      up_disable_irq(vectorno);
      irq_detach(vectorno);
      return OK;
    }

  /* Otherwise set callback and enable interrupt */

  irq_attach(vectorno, handler);
  up_enable_irq(vectorno);
//up_prioritize_irq(vectorno, NVIC_SYSH_PRIORITY_DEFAULT);
  return OK;
}

static void stm32_tim_enableint(FAR struct stm32_tim_dev_s *dev, int source)
{
  ASSERT(dev);
  stm32_modifyreg16(dev, STM32_BTIM_DIER_OFFSET, 0, ATIM_DIER_UIE);
}

static void stm32_tim_disableint(FAR struct stm32_tim_dev_s *dev, int source)
{
  ASSERT(dev);
  stm32_modifyreg16(dev, STM32_BTIM_DIER_OFFSET, ATIM_DIER_UIE, 0);
}

static void stm32_tim_ackint(FAR struct stm32_tim_dev_s *dev, int source)
{
  stm32_putreg16(dev, STM32_BTIM_SR_OFFSET, ~ATIM_SR_UIF);
}

/************************************************************************************
 * General Functions
 ************************************************************************************/

static int stm32_tim_setmode(FAR struct stm32_tim_dev_s *dev, stm32_tim_mode_t mode)
{
  uint16_t val = ATIM_CR1_CEN | ATIM_CR1_ARPE;

  ASSERT(dev);

  /* This function is not supported on basic timers. To enable or
   * disable it, simply set its clock to valid frequency or zero.
   */

#if STM32_NBTIM > 0
  if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM6_BASE
#endif
#if STM32_NBTIM > 1
      ||  ((struct stm32_tim_priv_s *)dev)->base == STM32_TIM7_BASE
#endif
#if STM32_NBTIM > 0
  )
    {
      return ERROR;
    }
#endif

  /* Decode operational modes */

  switch (mode & STM32_TIM_MODE_MASK)
    {
      case STM32_TIM_MODE_DISABLED:
        val = 0;
        break;

      case STM32_TIM_MODE_DOWN:
        val |= ATIM_CR1_DIR;

      case STM32_TIM_MODE_UP:
        break;

      case STM32_TIM_MODE_UPDOWN:
        val |= ATIM_CR1_CENTER1;
        // Our default: Interrupts are generated on compare, when counting down
        break;

      case STM32_TIM_MODE_PULSE:
        val |= ATIM_CR1_OPM;
        break;

      default: return ERROR;
    }

  stm32_tim_reload_counter(dev);
  stm32_putreg16(dev, STM32_BTIM_CR1_OFFSET, val);

#if STM32_NATIM > 0
  /* Advanced registers require Main Output Enable */

    if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM1_BASE ||
        ((struct stm32_tim_priv_s *)dev)->base == STM32_TIM8_BASE)
      {
        stm32_modifyreg16(dev, STM32_ATIM_BDTR_OFFSET, 0, ATIM_BDTR_MOE);
      }
#endif

  return OK;
}

static int stm32_tim_setchannel(FAR struct stm32_tim_dev_s *dev, uint8_t channel, stm32_tim_channel_t mode)
{
  uint16_t ccmr_val = 0;
  uint16_t ccer_val = stm32_getreg16(dev, STM32_GTIM_CCER_OFFSET);
  uint8_t  ccmr_offset = STM32_GTIM_CCMR1_OFFSET;

  ASSERT(dev);

  /* Further we use range as 0..3; if channel=0 it will also overflow here */

  if (--channel > 4) return ERROR;

  /* Assume that channel is disabled and polarity is active high */

  ccer_val &= ~(3 << (channel << 2));

  /* This function is not supported on basic timers. To enable or
   * disable it, simply set its clock to valid frequency or zero.
   */

#if STM32_NBTIM > 0
  if (((struct stm32_tim_priv_s *)dev)->base == STM32_TIM6_BASE
#endif
#if STM32_NBTIM > 1
      || ((struct stm32_tim_priv_s *)dev)->base == STM32_TIM7_BASE
#endif
#if STM32_NBTIM > 0
  )
    {
      return ERROR;
    }
#endif

  /* Decode configuration */

  switch (mode & STM32_TIM_CH_MODE_MASK)
    {
      case STM32_TIM_CH_DISABLED:
        break;

      case STM32_TIM_CH_OUTPWM:
        ccmr_val  =  (ATIM_CCMR_MODE_PWM1 << ATIM_CCMR1_OC1M_SHIFT) + ATIM_CCMR1_OC1PE;
        ccer_val |= ATIM_CCER_CC1E << (channel << 2);
        break;

      default:
        return ERROR;
    }

  /* Set polarity */

  if (mode & STM32_TIM_CH_POLARITY_NEG)
    {
      ccer_val |= ATIM_CCER_CC1P << (channel << 2);
    }

  /* Define its position (shift) and get register offset */

  if (channel & 1)
    {
      ccmr_val <<= 8;
    }

  if (channel > 1)
    {
      ccmr_offset = STM32_GTIM_CCMR2_OFFSET;
    }

  stm32_putreg16(dev, ccmr_offset, ccmr_val);
  stm32_putreg16(dev, STM32_GTIM_CCER_OFFSET, ccer_val);

  /* set GPIO */

  switch (((struct stm32_tim_priv_s *)dev)->base)
    {
#if CONFIG_STM32_TIM2
      case STM32_TIM2_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM2_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM2_CH1OUT, mode);
              break;
#endif
#if defined(GPIO_TIM2_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM2_CH2OUT, mode);
              break;
#endif
#if defined(GPIO_TIM2_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM2_CH3OUT, mode);
              break;
#endif
#if defined(GPIO_TIM2_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM2_CH4OUT, mode);
              break;
#endif
            default:
              return ERROR;
          }
        break;
#endif
#if CONFIG_STM32_TIM3
      case STM32_TIM3_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM3_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM3_CH1OUT, mode);
              break;
#endif
#if defined(GPIO_TIM3_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM3_CH2OUT, mode);
              break;
#endif
#if defined(GPIO_TIM3_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM3_CH3OUT, mode);
              break;
#endif
#if defined(GPIO_TIM3_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM3_CH4OUT, mode);
              break;
#endif
            default:
              return ERROR;
          }
        break;
#endif
#if CONFIG_STM32_TIM4
      case STM32_TIM4_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM4_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM4_CH1OUT, mode);
              break;
#endif
#if defined(GPIO_TIM4_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM4_CH2OUT, mode);
              break;
#endif
#if defined(GPIO_TIM4_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM4_CH3OUT, mode);
              break;
#endif
#if defined(GPIO_TIM4_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM4_CH4OUT, mode);
              break;
#endif
            default: return ERROR;
          }
        break;
#endif
#if CONFIG_STM32_TIM5
      case STM32_TIM5_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM5_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM5_CH1OUT, mode);
              break;
#endif
#if defined(GPIO_TIM5_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM5_CH2OUT, mode);
              break;
#endif
#if defined(GPIO_TIM5_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM5_CH3OUT, mode);
              break;
#endif
#if defined(GPIO_TIM5_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM5_CH4OUT, mode);
              break;
#endif
            default: return ERROR;
          }
        break;
#endif

#if STM32_NATIM > 0
#if CONFIG_STM32_TIM1
      case STM32_TIM1_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM1_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM1_CH1OUT, mode); break;
#endif
#if defined(GPIO_TIM1_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM1_CH2OUT, mode); break;
#endif
#if defined(GPIO_TIM1_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM1_CH3OUT, mode); break;
#endif
#if defined(GPIO_TIM1_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM1_CH4OUT, mode); break;
#endif
            default: return ERROR;
          }
        break;
#endif
#if CONFIG_STM32_TIM8
      case STM32_TIM8_BASE:
        switch (channel)
          {
#if defined(GPIO_TIM8_CH1OUT)
            case 0:
              stm32_tim_gpioconfig(GPIO_TIM8_CH1OUT, mode); break;
#endif
#if defined(GPIO_TIM8_CH2OUT)
            case 1:
              stm32_tim_gpioconfig(GPIO_TIM8_CH2OUT, mode); break;
#endif
#if defined(GPIO_TIM8_CH3OUT)
            case 2:
              stm32_tim_gpioconfig(GPIO_TIM8_CH3OUT, mode); break;
#endif
#if defined(GPIO_TIM8_CH4OUT)
            case 3:
              stm32_tim_gpioconfig(GPIO_TIM8_CH4OUT, mode); break;
#endif
            default:
              return ERROR;
          }
        break;
#endif
#endif
      default:
        return ERROR;
    }

  return OK;
}

static int stm32_tim_setcompare(FAR struct stm32_tim_dev_s *dev, uint8_t channel, uint32_t compare)
{
  ASSERT(dev);

  switch (channel)
    {
      case 1:
        stm32_putreg32(dev, STM32_GTIM_CCR1_OFFSET, compare);
        break;
      case 2:
        stm32_putreg32(dev, STM32_GTIM_CCR2_OFFSET, compare);
        break;
      case 3:
        stm32_putreg32(dev, STM32_GTIM_CCR3_OFFSET, compare);
        break;
      case 4:
        stm32_putreg32(dev, STM32_GTIM_CCR4_OFFSET, compare);
        break;
      default:
        return ERROR;
    }
  return OK;
}

static int stm32_tim_getcapture(FAR struct stm32_tim_dev_s *dev, uint8_t channel)
{
  ASSERT(dev);

  switch (channel)
    {
      case 1:
        return stm32_getreg32(dev, STM32_GTIM_CCR1_OFFSET);
      case 2:
        return stm32_getreg32(dev, STM32_GTIM_CCR2_OFFSET);
      case 3:
        return stm32_getreg32(dev, STM32_GTIM_CCR3_OFFSET);
      case 4:
        return stm32_getreg32(dev, STM32_GTIM_CCR4_OFFSET);
    }
  return ERROR;
}

/************************************************************************************
 * Advanced Functions
 ************************************************************************************/

/* TODO: Advanced functions for the STM32_ATIM */

/************************************************************************************
 * Device Structures, Instantiation
 ************************************************************************************/

struct stm32_tim_ops_s stm32_tim_ops =
{
  .setmode        = &stm32_tim_setmode,
  .setclock       = &stm32_tim_setclock,
  .setperiod      = &stm32_tim_setperiod,
  .setchannel     = &stm32_tim_setchannel,
  .setcompare     = &stm32_tim_setcompare,
  .getcapture     = &stm32_tim_getcapture,
  .setisr         = &stm32_tim_setisr,
  .enableint      = &stm32_tim_enableint,
  .disableint     = &stm32_tim_disableint,
  .ackint         = &stm32_tim_ackint
};

#if CONFIG_STM32_TIM2
struct stm32_tim_priv_s stm32_tim2_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM2_BASE,
};
#endif

#if CONFIG_STM32_TIM3
struct stm32_tim_priv_s stm32_tim3_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM3_BASE,
};
#endif

#if CONFIG_STM32_TIM4
struct stm32_tim_priv_s stm32_tim4_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM4_BASE,
};
#endif

#if CONFIG_STM32_TIM5
struct stm32_tim_priv_s stm32_tim5_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM5_BASE,
};
#endif

#if STM32_NBTIM > 0
#if CONFIG_STM32_TIM6
struct stm32_tim_priv_s stm32_tim6_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM6_BASE,
};
#endif
#endif

#if STM32_NBTIM > 1
#if CONFIG_STM32_TIM7
struct stm32_tim_priv_s stm32_tim7_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM7_BASE,
};
#endif
#endif

#if STM32_NATIM > 0

#if CONFIG_STM32_TIM1
struct stm32_tim_priv_s stm32_tim1_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM1_BASE,
};
#endif

#if CONFIG_STM32_TIM8
struct stm32_tim_priv_s stm32_tim8_priv =
{
  .ops        = &stm32_tim_ops,
  .mode       = STM32_TIM_MODE_UNUSED,
  .base       = STM32_TIM8_BASE,
};
#endif

#endif

/************************************************************************************
 * Public Function - Initialization
 ************************************************************************************/

FAR struct stm32_tim_dev_s *stm32_tim_init(int timer)
{
  struct stm32_tim_dev_s *dev = NULL;

  /* Get structure and enable power */

  switch (timer)
    {
#if CONFIG_STM32_TIM2
      case 2:
        dev = (struct stm32_tim_dev_s *)&stm32_tim2_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM2EN);
        break;
#endif
#if CONFIG_STM32_TIM3
      case 3:
        dev = (struct stm32_tim_dev_s *)&stm32_tim3_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM3EN);
        break;
#endif
#if CONFIG_STM32_TIM4
      case 4:
        dev = (struct stm32_tim_dev_s *)&stm32_tim4_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM4EN);
        break;
#endif
#if CONFIG_STM32_TIM5
      case 5:
        dev = (struct stm32_tim_dev_s *)&stm32_tim5_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM5EN);
        break;
#endif

#if STM32_NBTIM > 0
#if CONFIG_STM32_TIM6
      case 6:
        dev = (struct stm32_tim_dev_s *)&stm32_tim6_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM6EN);
        break;
#endif
#endif
#if STM32_NBTIM > 1
#if CONFIG_STM32_TIM7
      case 7:
        dev = (struct stm32_tim_dev_s *)&stm32_tim7_priv;
        modifyreg32(STM32_RCC_APB1ENR, 0, RCC_APB1ENR_TIM7EN);
        break;
#endif
#endif

#if STM32_NATIM > 0
#if CONFIG_STM32_TIM1
      case 1:
        dev = (struct stm32_tim_dev_s *)&stm32_tim1_priv;
        modifyreg32(STM32_RCC_APB2ENR, 0, RCC_APB2ENR_TIM1EN);
        break;
#endif
#if CONFIG_STM32_TIM8
      case 8:
        dev = (struct stm32_tim_dev_s *)&stm32_tim8_priv;
        modifyreg32(STM32_RCC_APB2ENR, 0, RCC_APB2ENR_TIM8EN);
        break;
#endif
#endif
      default:
        return NULL;
    }

  /* Is device already allocated */

  if (((struct stm32_tim_priv_s *)dev)->mode != STM32_TIM_MODE_UNUSED)
    {
      return NULL;
    }

  stm32_tim_reset(dev);

  return dev;
}

/* TODO: Detach interrupts, and close down all TIM Channels */

int stm32_tim_deinit(FAR struct stm32_tim_dev_s * dev)
{
  ASSERT(dev);

  /* Disable power */

  switch (((struct stm32_tim_priv_s *)dev)->base)
    {
#if CONFIG_STM32_TIM2
      case STM32_TIM2_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM2EN, 0);
        break;
#endif
#if CONFIG_STM32_TIM3
      case STM32_TIM3_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM3EN, 0);
        break;
#endif
#if CONFIG_STM32_TIM4
      case STM32_TIM4_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM4EN, 0);
        break;
#endif
#if CONFIG_STM32_TIM5
      case STM32_TIM5_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM5EN, 0);
        break;
#endif
#if STM32_NBTIM > 0
#if CONFIG_STM32_TIM6
      case STM32_TIM6_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM6EN, 0);
        break;
#endif
#endif
#if STM32_NBTIM > 1
#if CONFIG_STM32_TIM7
      case STM32_TIM7_BASE:
        modifyreg32(STM32_RCC_APB1ENR, RCC_APB1ENR_TIM7EN, 0);
        break;
#endif
#endif

#if STM32_NATIM > 0
#if CONFIG_STM32_TIM1
      case STM32_TIM1_BASE:
        modifyreg32(STM32_RCC_APB2ENR, RCC_APB2ENR_TIM1EN, 0);
        break;
#endif
#if CONFIG_STM32_TIM8
      case STM32_TIM8_BASE:
        modifyreg32(STM32_RCC_APB2ENR, RCC_APB2ENR_TIM8EN, 0);
        break;
#endif
#endif
      default:
        return ERROR;
    }

  /* Mark it as free */

  ((struct stm32_tim_priv_s *)dev)->mode = STM32_TIM_MODE_UNUSED;

  return OK;
}

#endif /* defined(CONFIG_STM32_TIM1 || ... || TIM8) */