text: /*
   * Copyright (c) 2016, Freescale Semiconductor, Inc.
   * Copyright 2016-2018 NXP
   * All rights reserved.
   *
   * SPDX-License-Identifier: BSD-3-Clause
   */
  
  #ifndef _FSL_DMA_H_
  #define _FSL_DMA_H_
  
  #include "fsl_common.h"
  
  /*!
   * @addtogroup dma
   * @{
   */
  
  /*! @file */
  /*******************************************************************************
   * Definitions
   ******************************************************************************/
  
  /*! @name Driver version */
  /*@{*/
  /*! @brief DMA driver version */
  #define FSL_DMA_DRIVER_VERSION (MAKE_VERSION(2, 4, 0)) /*!< Version 2.4.0. */
  /*@}*/
  
  /*! @brief DMA max transfer size */
  #define DMA_MAX_TRANSFER_COUNT 0x400U
  /*! @brief DMA channel numbers */
  #if defined FSL_FEATURE_DMA_NUMBER_OF_CHANNELS
  #define FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(x) FSL_FEATURE_DMA_NUMBER_OF_CHANNELS
  #define FSL_FEATURE_DMA_MAX_CHANNELS FSL_FEATURE_DMA_NUMBER_OF_CHANNELS
  #define FSL_FEATURE_DMA_ALL_CHANNELS (FSL_FEATURE_DMA_NUMBER_OF_CHANNELS * FSL_FEATURE_SOC_DMA_COUNT)
  #endif
  /*! @brief DMA head link descriptor table align size */
  #define FSL_FEATURE_DMA_LINK_DESCRIPTOR_ALIGN_SIZE (16U)
  /*! @brief DMA head descriptor table allocate macro
   * To simplify user interface, this macro will help allocate descriptor memory,
   * user just need to provide the name and the number for the allocate descriptor.
   *
   * @param name, allocate decriptor name.
   * @param number, number of descriptor to be allocated.
   */
  #define DMA_ALLOCATE_HEAD_DESCRIPTORS(name, number) \
      SDK_ALIGN(dma_descriptor_t name[number], FSL_FEATURE_DMA_DESCRIPTOR_ALIGN_SIZE)
  /*! @brief DMA head descriptor table allocate macro at noncacheable section
   * To simplify user interface, this macro will help allocate descriptor memory at noncacheable section,
   * user just need to provide the name and the number for the allocate descriptor.
   *
   * @param name, allocate decriptor name.
   * @param number, number of descriptor to be allocated.
   */
  #define DMA_ALLOCATE_HEAD_DESCRIPTORS_AT_NONCACHEABLE(name, number) \
      AT_NONCACHEABLE_SECTION_ALIGN(dma_descriptor_t name[number], FSL_FEATURE_DMA_DESCRIPTOR_ALIGN_SIZE)
  /*! @brief DMA link descriptor table allocate macro
   * To simplify user interface, this macro will help allocate descriptor memory,
   * user just need to provide the name and the number for the allocate descriptor.
   *
   * @param name, allocate decriptor name.
   * @param number, number of descriptor to be allocated.
   */
  #define DMA_ALLOCATE_LINK_DESCRIPTORS(name, number) \
      SDK_ALIGN(dma_descriptor_t name[number], FSL_FEATURE_DMA_LINK_DESCRIPTOR_ALIGN_SIZE)
  /*! @brief DMA link descriptor table allocate macro at noncacheable section
   * To simplify user interface, this macro will help allocate descriptor memory at noncacheable section,
   * user just need to provide the name and the number for the allocate descriptor.
   *
   * @param name, allocate decriptor name.
   * @param number, number of descriptor to be allocated.
   */
  #define DMA_ALLOCATE_LINK_DESCRIPTORS_AT_NONCACHEABLE(name, number) \
      AT_NONCACHEABLE_SECTION_ALIGN(dma_descriptor_t name[number], FSL_FEATURE_DMA_LINK_DESCRIPTOR_ALIGN_SIZE)
  /*! @brief DMA transfer buffer address need to align with the transfer width */
  #define DMA_ALLOCATE_DATA_TRANSFER_BUFFER(name, width) SDK_ALIGN(name, width)
  /* Channel group consists of 32 channels. channel_group = (channel / 32) */
  #define DMA_CHANNEL_GROUP(channel) (((uint8_t)(channel)) >> 5U)
  /* Channel index in channel group. channel_index = (channel % 32) */
  #define DMA_CHANNEL_INDEX(channel) (((uint8_t)(channel)) & 0x1FU)
  /*! @brief DMA linked descriptor address algin size */
  #define DMA_COMMON_REG_GET(base, channel, reg) \
      (((volatile uint32_t *)(&((base)->COMMON[0].reg)))[DMA_CHANNEL_GROUP(channel)])
  #define DMA_COMMON_CONST_REG_GET(base, channel, reg) \
      (((volatile const uint32_t *)(&((base)->COMMON[0].reg)))[DMA_CHANNEL_GROUP(channel)])
  #define DMA_COMMON_REG_SET(base, channel, reg, value) \
      (((volatile uint32_t *)(&((base)->COMMON[0].reg)))[DMA_CHANNEL_GROUP(channel)] = (value))
  
  /*! @brief DMA descriptor end address calculate
   * @param start, start address
   * @param inc, address interleave size
   * @param bytes, transfer bytes
   * @param width, transfer width
   */
  #define DMA_DESCRIPTOR_END_ADDRESS(start, inc, bytes, width) \
      ((uint32_t *)((uint32_t)(start) + (inc) * (bytes) - (inc) * (width)))
  
  /*! @brief DMA channel transfer configurations macro
   * @param reload, true is reload link descriptor after current exhaust, false is not
   * @param clrTrig, true is clear trigger status, wait software trigger, false is not
   * @param intA, enable interruptA
   * @param intB, enable interruptB
   * @param width,transfer width
   * @param srcInc, source address interleave size
   * @param dstInc, destination address interleave size
   * @param bytes, transfer bytes
   */
  #define DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes)                                 \
      DMA_CHANNEL_XFERCFG_CFGVALID_MASK | DMA_CHANNEL_XFERCFG_RELOAD(reload) | DMA_CHANNEL_XFERCFG_CLRTRIG(clrTrig) | \
          DMA_CHANNEL_XFERCFG_SETINTA(intA) | DMA_CHANNEL_XFERCFG_SETINTB(intB) |                                     \
          DMA_CHANNEL_XFERCFG_WIDTH(width == 4UL ? 2UL : (width - 1UL)) |                                             \
          DMA_CHANNEL_XFERCFG_SRCINC(srcInc == (uint32_t)kDMA_AddressInterleave4xWidth ? (srcInc - 1UL) : srcInc) |   \
          DMA_CHANNEL_XFERCFG_DSTINC(dstInc == (uint32_t)kDMA_AddressInterleave4xWidth ? (dstInc - 1UL) : dstInc) |   \
          DMA_CHANNEL_XFERCFG_XFERCOUNT(bytes / width - 1UL)
  
  /*! @brief _dma_transfer_status DMA transfer status */
  enum
  {
      kStatus_DMA_Busy = MAKE_STATUS(kStatusGroup_DMA, 0), /*!< Channel is busy and can't handle the
                                                                  transfer request. */
  };
  
  /*! @brief _dma_addr_interleave_size dma address interleave size */
  enum
  {
      kDMA_AddressInterleave0xWidth = 0U, /*!< dma source/destination address no interleave */
      kDMA_AddressInterleave1xWidth = 1U, /*!< dma source/destination address interleave 1xwidth */
      kDMA_AddressInterleave2xWidth = 2U, /*!< dma source/destination address interleave 2xwidth */
      kDMA_AddressInterleave4xWidth = 4U, /*!< dma source/destination address interleave 3xwidth */
  };
  
  /*! @brief _dma_transfer_width dma transfer width */
  enum
  {
      kDMA_Transfer8BitWidth  = 1U, /*!< dma channel transfer bit width is 8 bit */
      kDMA_Transfer16BitWidth = 2U, /*!< dma channel transfer bit width is 16 bit */
      kDMA_Transfer32BitWidth = 4U, /*!< dma channel transfer bit width is 32 bit */
  };
  
  /*! @brief DMA descriptor structure */
  typedef struct _dma_descriptor
  {
      volatile uint32_t xfercfg; /*!< Transfer configuration */
      void *srcEndAddr;          /*!< Last source address of DMA transfer */
      void *dstEndAddr;          /*!< Last destination address of DMA transfer */
      void *linkToNextDesc;      /*!< Address of next DMA descriptor in chain */
  } dma_descriptor_t;
  
  /*! @brief DMA transfer configuration */
  typedef struct _dma_xfercfg
  {
      bool valid;             /*!< Descriptor is ready to transfer */
      bool reload;            /*!< Reload channel configuration register after
                                   current descriptor is exhausted */
      bool swtrig;            /*!< Perform software trigger. Transfer if fired
                                   when 'valid' is set */
      bool clrtrig;           /*!< Clear trigger */
      bool intA;              /*!< Raises IRQ when transfer is done and set IRQA status register flag */
      bool intB;              /*!< Raises IRQ when transfer is done and set IRQB status register flag */
      uint8_t byteWidth;      /*!< Byte width of data to transfer */
      uint8_t srcInc;         /*!< Increment source address by 'srcInc' x 'byteWidth' */
      uint8_t dstInc;         /*!< Increment destination address by 'dstInc' x 'byteWidth' */
      uint16_t transferCount; /*!< Number of transfers */
  } dma_xfercfg_t;
  
  /*! @brief DMA channel priority */
  typedef enum _dma_priority
  {
      kDMA_ChannelPriority0 = 0, /*!< Highest channel priority - priority 0 */
      kDMA_ChannelPriority1,     /*!< Channel priority 1 */
      kDMA_ChannelPriority2,     /*!< Channel priority 2 */
      kDMA_ChannelPriority3,     /*!< Channel priority 3 */
      kDMA_ChannelPriority4,     /*!< Channel priority 4 */
      kDMA_ChannelPriority5,     /*!< Channel priority 5 */
      kDMA_ChannelPriority6,     /*!< Channel priority 6 */
      kDMA_ChannelPriority7,     /*!< Lowest channel priority - priority 7 */
  } dma_priority_t;
  
  /*! @brief DMA interrupt flags */
  typedef enum _dma_int
  {
      kDMA_IntA,     /*!< DMA interrupt flag A */
      kDMA_IntB,     /*!< DMA interrupt flag B */
      kDMA_IntError, /*!< DMA interrupt flag error */
  } dma_irq_t;
  
  /*! @brief DMA trigger type*/
  typedef enum _dma_trigger_type
  {
      kDMA_NoTrigger        = 0,                                                         /*!< Trigger is disabled */
      kDMA_LowLevelTrigger  = DMA_CHANNEL_CFG_HWTRIGEN(1) | DMA_CHANNEL_CFG_TRIGTYPE(1), /*!< Low level active trigger */
      kDMA_HighLevelTrigger = DMA_CHANNEL_CFG_HWTRIGEN(1) | DMA_CHANNEL_CFG_TRIGTYPE(1) |
                              DMA_CHANNEL_CFG_TRIGPOL(1),    /*!< High level active trigger */
      kDMA_FallingEdgeTrigger = DMA_CHANNEL_CFG_HWTRIGEN(1), /*!< Falling edge active trigger */
      kDMA_RisingEdgeTrigger =
          DMA_CHANNEL_CFG_HWTRIGEN(1) | DMA_CHANNEL_CFG_TRIGPOL(1), /*!< Rising edge active trigger */
  } dma_trigger_type_t;
  
  /*! @brief _dma_burst_size DMA burst size*/
  enum
  {
      kDMA_BurstSize1    = 0U,  /*!< burst size 1 transfer */
      kDMA_BurstSize2    = 1U,  /*!< burst size 2 transfer */
      kDMA_BurstSize4    = 2U,  /*!< burst size 4 transfer */
      kDMA_BurstSize8    = 3U,  /*!< burst size 8 transfer */
      kDMA_BurstSize16   = 4U,  /*!< burst size 16 transfer */
      kDMA_BurstSize32   = 5U,  /*!< burst size 32 transfer */
      kDMA_BurstSize64   = 6U,  /*!< burst size 64 transfer */
      kDMA_BurstSize128  = 7U,  /*!< burst size 128 transfer */
      kDMA_BurstSize256  = 8U,  /*!< burst size 256 transfer */
      kDMA_BurstSize512  = 9U,  /*!< burst size 512 transfer */
      kDMA_BurstSize1024 = 10U, /*!< burst size 1024 transfer */
  };
  
  /*! @brief DMA trigger burst */
  typedef enum _dma_trigger_burst
  {
      kDMA_SingleTransfer     = 0,                            /*!< Single transfer */
      kDMA_LevelBurstTransfer = DMA_CHANNEL_CFG_TRIGBURST(1), /*!< Burst transfer driven by level trigger */
      kDMA_EdgeBurstTransfer1 = DMA_CHANNEL_CFG_TRIGBURST(1), /*!< Perform 1 transfer by edge trigger */
      kDMA_EdgeBurstTransfer2 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(1), /*!< Perform 2 transfers by edge trigger */
      kDMA_EdgeBurstTransfer4 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(2), /*!< Perform 4 transfers by edge trigger */
      kDMA_EdgeBurstTransfer8 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(3), /*!< Perform 8 transfers by edge trigger */
      kDMA_EdgeBurstTransfer16 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(4), /*!< Perform 16 transfers by edge trigger */
      kDMA_EdgeBurstTransfer32 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(5), /*!< Perform 32 transfers by edge trigger */
      kDMA_EdgeBurstTransfer64 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(6), /*!< Perform 64 transfers by edge trigger */
      kDMA_EdgeBurstTransfer128 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(7), /*!< Perform 128 transfers by edge trigger */
      kDMA_EdgeBurstTransfer256 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(8), /*!< Perform 256 transfers by edge trigger */
      kDMA_EdgeBurstTransfer512 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(9), /*!< Perform 512 transfers by edge trigger */
      kDMA_EdgeBurstTransfer1024 =
          DMA_CHANNEL_CFG_TRIGBURST(1) | DMA_CHANNEL_CFG_BURSTPOWER(10), /*!< Perform 1024 transfers by edge trigger */
  } dma_trigger_burst_t;
  
  /*! @brief DMA burst wrapping */
  typedef enum _dma_burst_wrap
  {
      kDMA_NoWrap        = 0,                               /*!< Wrapping is disabled */
      kDMA_SrcWrap       = DMA_CHANNEL_CFG_SRCBURSTWRAP(1), /*!< Wrapping is enabled for source */
      kDMA_DstWrap       = DMA_CHANNEL_CFG_DSTBURSTWRAP(1), /*!< Wrapping is enabled for destination */
      kDMA_SrcAndDstWrap = DMA_CHANNEL_CFG_SRCBURSTWRAP(1) |
                           DMA_CHANNEL_CFG_DSTBURSTWRAP(1), /*!< Wrapping is enabled for source and destination */
  } dma_burst_wrap_t;
  
  /*! @brief DMA transfer type */
  typedef enum _dma_transfer_type
  {
      kDMA_MemoryToMemory = 0x0U, /*!< Transfer from memory to memory (increment source and destination) */
      kDMA_PeripheralToMemory,    /*!< Transfer from peripheral to memory (increment only destination) */
      kDMA_MemoryToPeripheral,    /*!< Transfer from memory to peripheral (increment only source)*/
      kDMA_StaticToStatic,        /*!< Peripheral to static memory (do not increment source or destination) */
  } dma_transfer_type_t;
  
  /*! @brief DMA channel trigger */
  typedef struct _dma_channel_trigger
  {
      dma_trigger_type_t type;   /*!< Select hardware trigger as edge triggered or level triggered. */
      dma_trigger_burst_t burst; /*!< Select whether hardware triggers cause a single or burst transfer. */
      dma_burst_wrap_t wrap;     /*!< Select wrap type, source wrap or dest wrap, or both. */
  } dma_channel_trigger_t;
  
  /*! @brief DMA channel trigger */
  typedef struct _dma_channel_config
  {
      void *srcStartAddr;             /*!< Source data address */
      void *dstStartAddr;             /*!< Destination data address */
      void *nextDesc;                 /*!< Chain custom descriptor */
      uint32_t xferCfg;               /*!< channel transfer configurations */
      dma_channel_trigger_t *trigger; /*!< DMA trigger type */
      bool isPeriph;                  /*!< select the request type */
  } dma_channel_config_t;
  
  /*! @brief DMA transfer configuration */
  typedef struct _dma_transfer_config
  {
      uint8_t *srcAddr;      /*!< Source data address */
      uint8_t *dstAddr;      /*!< Destination data address */
      uint8_t *nextDesc;     /*!< Chain custom descriptor */
      dma_xfercfg_t xfercfg; /*!< Transfer options */
      bool isPeriph;         /*!< DMA transfer is driven by peripheral */
  } dma_transfer_config_t;
  
  /*! @brief Callback for DMA */
  struct _dma_handle;
  
  /*! @brief Define Callback function for DMA. */
  typedef void (*dma_callback)(struct _dma_handle *handle, void *userData, bool transferDone, uint32_t intmode);
  
  /*! @brief DMA transfer handle structure */
  typedef struct _dma_handle
  {
      dma_callback callback; /*!< Callback function. Invoked when transfer
                                 of descriptor with interrupt flag finishes */
      void *userData;        /*!< Callback function parameter */
      DMA_Type *base;        /*!< DMA peripheral base address */
      uint8_t channel;       /*!< DMA channel number */
  } dma_handle_t;
  
  /*******************************************************************************
   * APIs
   ******************************************************************************/
  #if defined(__cplusplus)
  extern "C" {
  #endif /* __cplusplus */
  
  /*!
   * @name DMA initialization and De-initialization
   * @{
   */
  
  /*!
   * @brief Initializes DMA peripheral.
   *
   * This function enable the DMA clock, set descriptor table and
   * enable DMA peripheral.
   *
   * @param base DMA peripheral base address.
   */
  void DMA_Init(DMA_Type *base);
  
  /*!
   * @brief Deinitializes DMA peripheral.
   *
   * This function gates the DMA clock.
   *
   * @param base DMA peripheral base address.
   */
  void DMA_Deinit(DMA_Type *base);
  
  /*!
   * @brief Install DMA descriptor memory.
   *
   * This function used to register DMA descriptor memory for linked transfer, a typical case is ping pong
   * transfer which will request more than one DMA descriptor memory space, althrough current DMA driver has
   * a default DMA descriptor buffer, but it support one DMA descriptor for one channel only.
   *
   * @param base DMA base address.
   * @param addr DMA descriptor address
   */
  void DMA_InstallDescriptorMemory(DMA_Type *base, void *addr);
  
  /* @} */
  /*!
   * @name DMA Channel Operation
   * @{
   */
  
  /*!
   * @brief Return whether DMA channel is processing transfer
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @return True for active state, false otherwise.
   */
  static inline bool DMA_ChannelIsActive(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      return (DMA_COMMON_CONST_REG_GET(base, channel, ACTIVE) & (1UL << DMA_CHANNEL_INDEX(channel))) != 0UL;
  }
  
  /*!
   * @brief Return whether DMA channel is busy
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @return True for busy state, false otherwise.
   */
  static inline bool DMA_ChannelIsBusy(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      return (DMA_COMMON_CONST_REG_GET(base, channel, BUSY) & (1UL << DMA_CHANNEL_INDEX(channel))) != 0UL;
  }
  
  /*!
   * @brief Enables the interrupt source for the DMA transfer.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_EnableChannelInterrupts(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      DMA_COMMON_REG_GET(base, channel, INTENSET) |= 1UL << DMA_CHANNEL_INDEX(channel);
  }
  
  /*!
   * @brief Disables the interrupt source for the DMA transfer.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_DisableChannelInterrupts(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      DMA_COMMON_REG_GET(base, channel, INTENCLR) |= 1UL << DMA_CHANNEL_INDEX(channel);
  }
  
  /*!
   * @brief Enable DMA channel.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_EnableChannel(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      DMA_COMMON_REG_GET(base, channel, ENABLESET) |= 1UL << DMA_CHANNEL_INDEX(channel);
  }
  
  /*!
   * @brief Disable DMA channel.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_DisableChannel(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      DMA_COMMON_REG_GET(base, channel, ENABLECLR) |= 1UL << DMA_CHANNEL_INDEX(channel);
  }
  
  /*!
   * @brief Set PERIPHREQEN of channel configuration register.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_EnableChannelPeriphRq(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      base->CHANNEL[channel].CFG |= DMA_CHANNEL_CFG_PERIPHREQEN_MASK;
  }
  
  /*!
   * @brief Get PERIPHREQEN value of channel configuration register.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @return True for enabled PeriphRq, false for disabled.
   */
  static inline void DMA_DisableChannelPeriphRq(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      base->CHANNEL[channel].CFG &= ~DMA_CHANNEL_CFG_PERIPHREQEN_MASK;
  }
  
  /*!
   * @brief Set trigger settings of DMA channel.
   * @deprecated Do not use this function.  It has been superceded by @ref DMA_SetChannelConfig.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @param trigger trigger configuration.
   */
  void DMA_ConfigureChannelTrigger(DMA_Type *base, uint32_t channel, dma_channel_trigger_t *trigger);
  
  /*!
   * @brief set channel config.
   *
   * This function provide a interface to configure channel configuration reisters.
   *
   * @param base DMA base address.
   * @param channel DMA channel number.
   * @param trigger channel configurations structure.
   * @param isPeriph true is periph request, false is not.
   */
  void DMA_SetChannelConfig(DMA_Type *base, uint32_t channel, dma_channel_trigger_t *trigger, bool isPeriph);
  
  /*!
   * @brief Gets the remaining bytes of the current DMA descriptor transfer.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @return The number of bytes which have not been transferred yet.
   */
  uint32_t DMA_GetRemainingBytes(DMA_Type *base, uint32_t channel);
  
  /*!
   * @brief Set priority of channel configuration register.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @param priority Channel priority value.
   */
  static inline void DMA_SetChannelPriority(DMA_Type *base, uint32_t channel, dma_priority_t priority)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      base->CHANNEL[channel].CFG =
          (base->CHANNEL[channel].CFG & (~(DMA_CHANNEL_CFG_CHPRIORITY_MASK))) | DMA_CHANNEL_CFG_CHPRIORITY(priority);
  }
  
  /*!
   * @brief Get priority of channel configuration register.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @return Channel priority value.
   */
  static inline dma_priority_t DMA_GetChannelPriority(DMA_Type *base, uint32_t channel)
  {
      assert(channel < (uint32_t)FSL_FEATURE_DMA_NUMBER_OF_CHANNELSn(base));
      return (dma_priority_t)(uint8_t)((base->CHANNEL[channel].CFG & DMA_CHANNEL_CFG_CHPRIORITY_MASK) >>
                                       DMA_CHANNEL_CFG_CHPRIORITY_SHIFT);
  }
  
  /*!
   * @brief Set channel configuration valid..
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_SetChannelConfigValid(DMA_Type *base, uint32_t channel)
  {
      base->CHANNEL[channel].XFERCFG |= DMA_CHANNEL_XFERCFG_CFGVALID_MASK;
  }
  
  /*!
   * @brief Do software trigger for the channel.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  static inline void DMA_DoChannelSoftwareTrigger(DMA_Type *base, uint32_t channel)
  {
      base->CHANNEL[channel].XFERCFG |= DMA_CHANNEL_XFERCFG_SWTRIG_MASK;
  }
  
  /*!
   * @brief Load channel transfer configurations.
   *
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   * @param xfer transfer configurations.
   */
  static inline void DMA_LoadChannelTransferConfig(DMA_Type *base, uint32_t channel, uint32_t xfer)
  {
      base->CHANNEL[channel].XFERCFG = xfer;
  }
  
  /*!
   * @brief Create application specific DMA descriptor
   *        to be used in a chain in transfer
   * @deprecated Do not use this function.  It has been superceded by @ref DMA_SetupDescriptor.
   * @param desc DMA descriptor address.
   * @param xfercfg Transfer configuration for DMA descriptor.
   * @param srcAddr Address of last item to transmit
   * @param dstAddr Address of last item to receive.
   * @param nextDesc Address of next descriptor in chain.
   */
  void DMA_CreateDescriptor(dma_descriptor_t *desc, dma_xfercfg_t *xfercfg, void *srcAddr, void *dstAddr, void *nextDesc);
  
  /*!
   * @brief setup dma descriptor
   *
   * Note: This function do not support configure wrap descriptor.
   *
   * @param desc DMA descriptor address.
   * @param xfercfg Transfer configuration for DMA descriptor.
   * @param srcStartAddr Start address of source address.
   * @param dstStartAddr Start address of destination address.
   * @param nextDesc Address of next descriptor in chain.
   */
  void DMA_SetupDescriptor(
      dma_descriptor_t *desc, uint32_t xfercfg, void *srcStartAddr, void *dstStartAddr, void *nextDesc);
  
  /*!
   * @brief setup dma channel descriptor
   *
   * Note: This function support configure wrap descriptor.
   *
   * @param desc DMA descriptor address.
   * @param xfercfg Transfer configuration for DMA descriptor.
   * @param srcStartAddr Start address of source address.
   * @param dstStartAddr Start address of destination address.
   * @param nextDesc Address of next descriptor in chain.
   * @param wrapType burst wrap type.
   * @param burstSize burst size, reference _dma_burst_size.
   */
  void DMA_SetupChannelDescriptor(dma_descriptor_t *desc,
                                  uint32_t xfercfg,
                                  void *srcStartAddr,
                                  void *dstStartAddr,
                                  void *nextDesc,
                                  dma_burst_wrap_t wrapType,
                                  uint32_t burstSize);
  
  /*!
   * @brief load channel transfer decriptor.
   *
   * This function can be used to load desscriptor to driver internal channel descriptor that is used to start DMA
   * transfer, the head descriptor table is defined in DMA driver, it is useful for the case:
   * 1. for the polling transfer, application can allocate a local descriptor memory table to prepare a descriptor firstly
   * and then call this api to load the configured descriptor to driver descriptor table.
   * @code
   *   DMA_Init(DMA0);
   *   DMA_EnableChannel(DMA0, DEMO_DMA_CHANNEL);
   *   DMA_SetupDescriptor(desc, xferCfg, s_srcBuffer, &s_destBuffer[0], NULL);
   *   DMA_LoadChannelDescriptor(DMA0, DEMO_DMA_CHANNEL, (dma_descriptor_t *)desc);
   *   DMA_DoChannelSoftwareTrigger(DMA0, DEMO_DMA_CHANNEL);
   *   while(DMA_ChannelIsBusy(DMA0, DEMO_DMA_CHANNEL))
   *   {}
   * @endcode
   *
   * @param base DMA base address.
   * @param channel DMA channel.
   * @param descriptor configured DMA descriptor.
   */
  void DMA_LoadChannelDescriptor(DMA_Type *base, uint32_t channel, dma_descriptor_t *descriptor);
  
  /* @} */
  
  /*!
   * @name DMA Transactional Operation
   * @{
   */
  
  /*!
   * @brief Abort running transfer by handle.
   *
   * This function aborts DMA transfer specified by handle.
   *
   * @param handle DMA handle pointer.
   */
  void DMA_AbortTransfer(dma_handle_t *handle);
  
  /*!
   * @brief Creates the DMA handle.
   *
   * This function is called if using transaction API for DMA. This function
   * initializes the internal state of DMA handle.
   *
   * @param handle DMA handle pointer. The DMA handle stores callback function and
   *               parameters.
   * @param base DMA peripheral base address.
   * @param channel DMA channel number.
   */
  void DMA_CreateHandle(dma_handle_t *handle, DMA_Type *base, uint32_t channel);
  
  /*!
   * @brief Installs a callback function for the DMA transfer.
   *
   * This callback is called in DMA IRQ handler. Use the callback to do something after
   * the current major loop transfer completes.
   *
   * @param handle DMA handle pointer.
   * @param callback DMA callback function pointer.
   * @param userData Parameter for callback function.
   */
  void DMA_SetCallback(dma_handle_t *handle, dma_callback callback, void *userData);
  
  /*!
   * @brief Prepares the DMA transfer structure.
   * @deprecated Do not use this function.  It has been superceded by @ref DMA_PrepareChannelTransfer.
   * This function prepares the transfer configuration structure according to the user input.
   *
   * @param config The user configuration structure of type dma_transfer_t.
   * @param srcAddr DMA transfer source address.
   * @param dstAddr DMA transfer destination address.
   * @param byteWidth DMA transfer destination address width(bytes).
   * @param transferBytes DMA transfer bytes to be transferred.
   * @param type DMA transfer type.
   * @param nextDesc Chain custom descriptor to transfer.
   * @note The data address and the data width must be consistent. For example, if the SRC
   *       is 4 bytes, so the source address must be 4 bytes aligned, or it shall result in
   *       source address error(SAE).
   */
  void DMA_PrepareTransfer(dma_transfer_config_t *config,
                           void *srcAddr,
                           void *dstAddr,
                           uint32_t byteWidth,
                           uint32_t transferBytes,
                           dma_transfer_type_t type,
                           void *nextDesc);
  
  /*!
   * @brief Prepare channel transfer configurations.
   *
   * This function used to prepare channel transfer configurations.
   *
   * @param config Pointer to DMA channel transfer configuration structure.
   * @param srcStartAddr source start address.
   * @param dstStartAddr destination start address.
   * @param xferCfg xfer configuration, user can reference DMA_CHANNEL_XFER about to how to get xferCfg value.
   * @param type transfer type.
   * @param trigger DMA channel trigger configurations.
   * @param nextDesc address of next descriptor.
   */
  void DMA_PrepareChannelTransfer(dma_channel_config_t *config,
                                  void *srcStartAddr,
                                  void *dstStartAddr,
                                  uint32_t xferCfg,
                                  dma_transfer_type_t type,
                                  dma_channel_trigger_t *trigger,
                                  void *nextDesc);
  
  /*!
   * @brief Submits the DMA transfer request.
   * @deprecated Do not use this function.  It has been superceded by @ref DMA_SubmitChannelTransfer.
   *
   * This function submits the DMA transfer request according to the transfer configuration structure.
   * If the user submits the transfer request repeatedly, this function packs an unprocessed request as
   * a TCD and enables scatter/gather feature to process it in the next time.
   *
   * @param handle DMA handle pointer.
   * @param config Pointer to DMA transfer configuration structure.
   * @retval kStatus_DMA_Success It means submit transfer request succeed.
   * @retval kStatus_DMA_QueueFull It means TCD queue is full. Submit transfer request is not allowed.
   * @retval kStatus_DMA_Busy It means the given channel is busy, need to submit request later.
   */
  status_t DMA_SubmitTransfer(dma_handle_t *handle, dma_transfer_config_t *config);
  
  /*!
   * @brief Submit channel transfer paramter directly.
   *
   * This function used to configue channel head descriptor that is used to start DMA transfer, the head descriptor table
   * is defined in DMA driver, it is useful for the case:
   * 1. for the single transfer, application doesn't need to allocate descriptor table, the head descriptor can be used
   for it.
   * @code
      DMA_SetChannelConfig(base, channel, trigger, isPeriph);
      DMA_CreateHandle(handle, base, channel)
      DMA_SubmitChannelTransferParameter(handle, DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc,
   bytes), srcStartAddr, dstStartAddr, NULL);
      DMA_StartTransfer(handle)
   * @endcode
   *
   * 2. for the linked transfer, application should responsible for link descriptor, for example, if 4 transfer is
   required, then application should prepare
   *  three descriptor table with macro , the head descriptor in driver can be used for the first transfer descriptor.
   * @code
      define link descriptor table in application with macro
      DMA_ALLOCATE_LINK_DESCRIPTOR(nextDesc[3]);
  
      DMA_SetupDescriptor(nextDesc0,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc1);
      DMA_SetupDescriptor(nextDesc1,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc2);
      DMA_SetupDescriptor(nextDesc2,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, NULL);
      DMA_SetChannelConfig(base, channel, trigger, isPeriph);
      DMA_CreateHandle(handle, base, channel)
      DMA_SubmitChannelTransferParameter(handle, DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc,
   bytes), srcStartAddr, dstStartAddr, nextDesc0);
      DMA_StartTransfer(handle);
   * @endcode
   *
   * @param handle Pointer to DMA handle.
   * @param xferCfg xfer configuration, user can reference DMA_CHANNEL_XFER about to how to get xferCfg value.
   * @param srcStartAddr source start address.
   * @param dstStartAddr destination start address.
   * @param nextDesc address of next descriptor.
   */
  void DMA_SubmitChannelTransferParameter(
      dma_handle_t *handle, uint32_t xfercfg, void *srcStartAddr, void *dstStartAddr, void *nextDesc);
  
  /*!
   * @brief Submit channel descriptor.
   *
   * This function used to configue channel head descriptor that is used to start DMA transfer, the head descriptor table
   is defined in
   * DMA driver, this functiono is typical for the ping pong case:
   *
   * 1. for the ping pong case, application should responsible for the descriptor, for example, application should
   * prepare two descriptor table with macro.
   * @code
      define link descriptor table in application with macro
      DMA_ALLOCATE_LINK_DESCRIPTOR(nextDesc[2]);
  
      DMA_SetupDescriptor(nextDesc0,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc1);
      DMA_SetupDescriptor(nextDesc1,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc0);
      DMA_SetChannelConfig(base, channel, trigger, isPeriph);
      DMA_CreateHandle(handle, base, channel)
      DMA_SubmitChannelDescriptor(handle,  nextDesc0);
      DMA_StartTransfer(handle);
   * @endcode
   *
   * @param handle Pointer to DMA handle.
   * @param descriptor descriptor to submit.
   */
  void DMA_SubmitChannelDescriptor(dma_handle_t *handle, dma_descriptor_t *descriptor);
  
  /*!
   * @brief Submits the DMA channel transfer request.
   *
   * This function submits the DMA transfer request according to the transfer configuration structure.
   * If the user submits the transfer request repeatedly, this function packs an unprocessed request as
   * a TCD and enables scatter/gather feature to process it in the next time.
   * It is used for the case:
   * 1. for the single transfer, application doesn't need to allocate descriptor table, the head descriptor can be used
   for it.
   * @code
      DMA_CreateHandle(handle, base, channel)
      DMA_PrepareChannelTransfer(config,srcStartAddr,dstStartAddr,xferCfg,type,trigger,NULL);
      DMA_SubmitChannelTransfer(handle, config)
      DMA_StartTransfer(handle)
   * @endcode
   *
   * 2. for the linked transfer, application should responsible for link descriptor, for example, if 4 transfer is
   required, then application should prepare
   *  three descriptor table with macro , the head descriptor in driver can be used for the first transfer descriptor.
   * @code
      define link descriptor table in application with macro
      DMA_ALLOCATE_LINK_DESCRIPTOR(nextDesc);
      DMA_SetupDescriptor(nextDesc0,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc1);
      DMA_SetupDescriptor(nextDesc1,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc2);
      DMA_SetupDescriptor(nextDesc2,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, NULL);
      DMA_CreateHandle(handle, base, channel)
      DMA_PrepareChannelTransfer(config,srcStartAddr,dstStartAddr,xferCfg,type,trigger,nextDesc0);
      DMA_SubmitChannelTransfer(handle, config)
      DMA_StartTransfer(handle)
   * @endcode
   *
   * 3. for the ping pong case, application should responsible for link descriptor, for example, application should
   prepare
   *  two descriptor table with macro , the head descriptor in driver can be used for the first transfer descriptor.
   * @code
      define link descriptor table in application with macro
      DMA_ALLOCATE_LINK_DESCRIPTOR(nextDesc);
  
      DMA_SetupDescriptor(nextDesc0,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc1);
      DMA_SetupDescriptor(nextDesc1,  DMA_CHANNEL_XFER(reload, clrTrig, intA, intB, width, srcInc, dstInc, bytes),
   srcStartAddr, dstStartAddr, nextDesc0);
      DMA_CreateHandle(handle, base, channel)
      DMA_PrepareChannelTransfer(config,srcStartAddr,dstStartAddr,xferCfg,type,trigger,nextDesc0);
      DMA_SubmitChannelTransfer(handle, config)
      DMA_StartTransfer(handle)
   * @endcode
   * @param handle DMA handle pointer.
   * @param config Pointer to DMA transfer configuration structure.
   * @retval kStatus_DMA_Success It means submit transfer request succeed.
   * @retval kStatus_DMA_QueueFull It means TCD queue is full. Submit transfer request is not allowed.
   * @retval kStatus_DMA_Busy It means the given channel is busy, need to submit request later.
   */
  status_t DMA_SubmitChannelTransfer(dma_handle_t *handle, dma_channel_config_t *config);
  
  /*!
   * @brief DMA start transfer.
   *
   * This function enables the channel request. User can call this function after submitting the transfer request
   * It will trigger transfer start with software trigger only when hardware trigger is not used.
   *
   * @param handle DMA handle pointer.
   */
  void DMA_StartTransfer(dma_handle_t *handle);
  
  /*!
   * @brief DMA IRQ handler for descriptor transfer complete.
   *
   * This function clears the channel major interrupt flag and call
   * the callback function if it is not NULL.
   *
   * @param base DMA base address.
   */
  void DMA_IRQHandle(DMA_Type *base);
  
  /* @} */
  
  #if defined(__cplusplus)
  }
  #endif /* __cplusplus */
  
  /* @} */
  
  #endif /*_FSL_DMA_H_*/
  