udma.h

/******************************************************************************
*  Filename:       udma.h
*  Revised:        2017-05-23 12:08:52 +0200 (Tue, 23 May 2017)
*  Revision:       49048
*
*  Description:    Defines and prototypes for the uDMA controller.
*
*  Copyright (c) 2015 - 2017, Texas Instruments Incorporated
*  All rights reserved.
*
*  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 of the ORGANIZATION 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 HOLDER OR CONTRIBUTORS BE
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*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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*
******************************************************************************/

//*****************************************************************************
//
//! \addtogroup peripheral_group
//! @{
//! \addtogroup udma_api
//! @{
//
//*****************************************************************************

#ifndef __UDMA_H__
#define __UDMA_H__

//*****************************************************************************
//
// If building with a C++ compiler, make all of the definitions in this header
// have a C binding.
//
//*****************************************************************************
#ifdef __cplusplus
extern "C"
{
#endif

#include <stdbool.h>
#include <stdint.h>
#include "../inc/hw_types.h"
#include "../inc/hw_ints.h"
#include "../inc/hw_memmap.h"
#include "../inc/hw_udma.h"
#include "debug.h"
#include "interrupt.h"

//*****************************************************************************
//
// Support for DriverLib in ROM:
// This section renames all functions that are not "static inline", so that
// calling these functions will default to implementation in flash. At the end
// of this file a second renaming will change the defaults to implementation in
// ROM for available functions.
//
// To force use of the implementation in flash, e.g. for debugging:
// - Globally: Define DRIVERLIB_NOROM at project level
// - Per function: Use prefix "NOROM_" when calling the function
//
//*****************************************************************************
#if !defined(DOXYGEN)
    #define uDMAChannelAttributeEnable      NOROM_uDMAChannelAttributeEnable
    #define uDMAChannelAttributeDisable     NOROM_uDMAChannelAttributeDisable
    #define uDMAChannelAttributeGet         NOROM_uDMAChannelAttributeGet
    #define uDMAChannelControlSet           NOROM_uDMAChannelControlSet
    #define uDMAChannelTransferSet          NOROM_uDMAChannelTransferSet
    #define uDMAChannelScatterGatherSet     NOROM_uDMAChannelScatterGatherSet
    #define uDMAChannelSizeGet              NOROM_uDMAChannelSizeGet
    #define uDMAChannelModeGet              NOROM_uDMAChannelModeGet
#endif

//*****************************************************************************
//
//! \brief A structure that defines an entry in the channel control table.
//!
//! These fields are used by the uDMA controller and normally it is not necessary for
//! software to directly read or write fields in the table.
//
//*****************************************************************************
typedef struct
{
    volatile void *pvSrcEndAddr;   //!< The ending source address of the data transfer.
    volatile void *pvDstEndAddr;   //!< The ending destination address of the data transfer.
    volatile uint32_t ui32Control; //!< The channel control mode.
    volatile uint32_t ui32Spare;   //!< An unused location.
}
tDMAControlTable;

//*****************************************************************************
//
//! \brief A helper macro for building scatter-gather task table entries.
//!
//! This macro is intended to be used to help populate a table of uDMA tasks
//! for a scatter-gather transfer. This macro will calculate the values for
//! the fields of a task structure entry based on the input parameters.
//!
//! There are specific requirements for the values of each parameter.  No
//! checking is done so it is up to the caller to ensure that correct values
//! are used for the parameters.
//!
//! This macro is intended to be used to initialize individual entries of
//! a structure of tDMAControlTable type, like this:
//!
/*!
\verbatim
  tDMAControlTable MyTaskList[] =
  {
      uDMATaskStructEntry(Task1Count, UDMA_SIZE_8,
                          UDMA_SRC_INC_8, MySourceBuf,
                          UDMA_DST_INC_8, MyDestBuf,
                          UDMA_ARB_8, UDMA_MODE_MEM_SCATTER_GATHER),
      uDMATaskStructEntry(Task2Count, ... ),
  }
\endverbatim
*/
//! \param ui32TransferCount is the count of items to transfer for this task.
//! It must be in the range 1-1024.
//! \param ui32ItemSize is the bit size of the items to transfer for this task.
//! It must be one of:
//! - \ref UDMA_SIZE_8
//! - \ref UDMA_SIZE_16
//! - \ref UDMA_SIZE_32
//! \param ui32SrcIncrement is the bit size increment for source data.
//! It must be one of:
//! - \ref UDMA_SRC_INC_8
//! - \ref UDMA_SRC_INC_16
//! - \ref UDMA_SRC_INC_32
//! - \ref UDMA_SRC_INC_NONE
//! \param pvSrcAddr is the starting address of the data to transfer.
//! \param ui32DstIncrement is the bit size increment for destination data.
//! It must be one of:
//! - \ref UDMA_DST_INC_8
//! - \ref UDMA_DST_INC_16
//! - \ref UDMA_DST_INC_32
//! - \ref UDMA_DST_INC_NONE
//! \param pvDstAddr is the starting address of the destination data.
//! \param ui32ArbSize is the arbitration size to use for the transfer task.
//! This is used to select the arbitration size in powers of 2, from 1 to 1024.
//! It must be one of:
//! - \ref UDMA_ARB_1
//! - \ref UDMA_ARB_2
//! - \ref UDMA_ARB_4
//! - ...
//! - \ref UDMA_ARB_1024
//! \param ui32Mode is the transfer mode for this task.
//! Note that normally all tasks will be one of the scatter-gather modes while the
//! last task is a task list will be AUTO or BASIC.
//! It must be one of:
//! - \ref UDMA_MODE_BASIC
//! - \ref UDMA_MODE_AUTO
//! - \ref UDMA_MODE_MEM_SCATTER_GATHER
//! - \ref UDMA_MODE_PER_SCATTER_GATHER
//!
//! \return None (this is not a function)
//
//*****************************************************************************
#define uDMATaskStructEntry(ui32TransferCount,                                \
                            ui32ItemSize,                                     \
                            ui32SrcIncrement,                                 \
                            pvSrcAddr,                                        \
                            ui32DstIncrement,                                 \
                            pvDstAddr,                                        \
                            ui32ArbSize,                                      \
                            ui32Mode)                                         \
    {                                                                         \
        (((ui32SrcIncrement) == UDMA_SRC_INC_NONE) ? (pvSrcAddr) :            \
            ((void *)(&((uint8_t *)(pvSrcAddr))[((ui32TransferCount) <<       \
                                         ((ui32SrcIncrement) >> 26)) - 1]))), \
        (((ui32DstIncrement) == UDMA_DST_INC_NONE) ? (pvDstAddr) :            \
            ((void *)(&((uint8_t *)(pvDstAddr))[((ui32TransferCount) <<       \
                                         ((ui32DstIncrement) >> 30)) - 1]))), \
        (ui32SrcIncrement) | (ui32DstIncrement) | (ui32ItemSize) |            \
        (ui32ArbSize) | (((ui32TransferCount) - 1) << 4) |                    \
        ((((ui32Mode) == UDMA_MODE_MEM_SCATTER_GATHER) ||                     \
          ((ui32Mode) == UDMA_MODE_PER_SCATTER_GATHER)) ?                     \
                (ui32Mode) | UDMA_MODE_ALT_SELECT : (ui32Mode)), 0            \
    }

//*****************************************************************************
//
// The hardware configured number of uDMA channels.
//
//*****************************************************************************
#define UDMA_NUM_CHANNELS       21

//*****************************************************************************
//
// The level of priority for the uDMA channels
//
//*****************************************************************************
#define UDMA_PRIORITY_LOW       0x00000000
#define UDMA_PRIORITY_HIGH      0x00000001

//*****************************************************************************
//
// Flags that can be passed to uDMAChannelAttributeEnable(),
// uDMAChannelAttributeDisable(), and returned from uDMAChannelAttributeGet().
//
//*****************************************************************************
#define UDMA_ATTR_USEBURST      0x00000001
#define UDMA_ATTR_ALTSELECT     0x00000002
#define UDMA_ATTR_HIGH_PRIORITY 0x00000004
#define UDMA_ATTR_REQMASK       0x00000008
#define UDMA_ATTR_ALL           0x0000000F

//*****************************************************************************
//
// DMA control modes that can be passed to uDMAChannelModeSet() and returned
// uDMAChannelModeGet().
//
//*****************************************************************************
#define UDMA_MODE_STOP          0x00000000
#define UDMA_MODE_BASIC         0x00000001
#define UDMA_MODE_AUTO          0x00000002
#define UDMA_MODE_PINGPONG      0x00000003
#define UDMA_MODE_MEM_SCATTER_GATHER                                          \
                                0x00000004
#define UDMA_MODE_PER_SCATTER_GATHER                                          \
                                0x00000006
#define UDMA_MODE_M             0x00000007  // uDMA Transfer Mode
#define UDMA_MODE_ALT_SELECT    0x00000001

//*****************************************************************************
//
// Channel configuration values that can be passed to uDMAControlSet().
//
//*****************************************************************************
#define UDMA_DST_INC_8          0x00000000
#define UDMA_DST_INC_16         0x40000000
#define UDMA_DST_INC_32         0x80000000
#define UDMA_DST_INC_NONE       0xC0000000
#define UDMA_DST_INC_M          0xC0000000  // Destination Address Increment
#define UDMA_DST_INC_S          30
#define UDMA_SRC_INC_8          0x00000000
#define UDMA_SRC_INC_16         0x04000000
#define UDMA_SRC_INC_32         0x08000000
#define UDMA_SRC_INC_NONE       0x0c000000
#define UDMA_SRC_INC_M          0x0C000000  // Source Address Increment
#define UDMA_SRC_INC_S          26
#define UDMA_SIZE_8             0x00000000
#define UDMA_SIZE_16            0x11000000
#define UDMA_SIZE_32            0x22000000
#define UDMA_SIZE_M             0x33000000  // Data Size
#define UDMA_SIZE_S             24
#define UDMA_ARB_1              0x00000000
#define UDMA_ARB_2              0x00004000
#define UDMA_ARB_4              0x00008000
#define UDMA_ARB_8              0x0000c000
#define UDMA_ARB_16             0x00010000
#define UDMA_ARB_32             0x00014000
#define UDMA_ARB_64             0x00018000
#define UDMA_ARB_128            0x0001c000
#define UDMA_ARB_256            0x00020000
#define UDMA_ARB_512            0x00024000
#define UDMA_ARB_1024           0x00028000
#define UDMA_ARB_M              0x0003C000  // Arbitration Size
#define UDMA_ARB_S              14
#define UDMA_NEXT_USEBURST      0x00000008
#define UDMA_XFER_SIZE_MAX      1024
#define UDMA_XFER_SIZE_M        0x00003FF0  // Transfer size
#define UDMA_XFER_SIZE_S        4

//*****************************************************************************
//
// Channel numbers to be passed to API functions that require a channel number
// ID.
//
//*****************************************************************************
#define UDMA_CHAN_SW_EVT0       0   // Software Event Channel 0
#define UDMA_CHAN_UART0_RX      1   // UART0 RX Data
#define UDMA_CHAN_UART0_TX      2   // UART0 RX Data
#define UDMA_CHAN_SSI0_RX       3   // SSI0 RX Data
#define UDMA_CHAN_SSI0_TX       4   // SSI0 RX Data
#define UDMA_CHAN_AUX_ADC       7   // AUX ADC event
#define UDMA_CHAN_AUX_SW        8   // AUX Software event
#define UDMA_CHAN_TIMER0_A      9   // Timer0 A event
#define UDMA_CHAN_TIMER0_B      10  // Timer0 B event
#define UDMA_CHAN_TIMER1_A      11
#define UDMA_CHAN_TIMER1_B      12
#define UDMA_CHAN_AON_PROG2     13
#define UDMA_CHAN_DMA_PROG      14
#define UDMA_CHAN_AON_RTC       15
#define UDMA_CHAN_SSI1_RX       16
#define UDMA_CHAN_SSI1_TX       17
#define UDMA_CHAN_SW_EVT1       18
#define UDMA_CHAN_SW_EVT2       19
#define UDMA_CHAN_SW_EVT3       20

//*****************************************************************************
//
// Flags to be OR'd with the channel ID to indicate if the primary or alternate
// control structure should be used.
//
//*****************************************************************************
#define UDMA_PRI_SELECT         0x00000000
#define UDMA_ALT_SELECT         0x00000020

//*****************************************************************************
//
// API Functions and prototypes
//
//*****************************************************************************

#ifdef DRIVERLIB_DEBUG
//*****************************************************************************
//
//! \internal
//!
//! \brief Checks a uDMA base address.
//!
//! This function determines if a uDMA module base address is valid.
//!
//! \param ui32Base specifies the uDMA module base address.
//!
//! \return Returns \c true if the base address is valid and \c false
//! otherwise.
//
//*****************************************************************************
static bool
uDMABaseValid(uint32_t ui32Base)
{
    return(ui32Base == UDMA0_BASE);
}
#endif

//*****************************************************************************
//
//! \brief Enables the uDMA controller for use.
//!
//! This function enables the uDMA controller. The uDMA controller must be
//! enabled before it can be configured and used.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAEnable(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Set the master enable bit in the config register.
    HWREG(ui32Base + UDMA_O_CFG) = UDMA_CFG_MASTERENABLE;
}

//*****************************************************************************
//
//! \brief Disables the uDMA controller for use.
//!
//! This function disables the uDMA controller.  Once disabled, the uDMA
//! controller will not operate until re-enabled with \ref uDMAEnable().
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return None.
//
//*****************************************************************************
__STATIC_INLINE void
uDMADisable(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Clear the master enable bit in the config register.
    HWREG(ui32Base + UDMA_O_CFG) = 0;
}

//*****************************************************************************
//
//! \brief Gets the uDMA error status.
//!
//! This function returns the uDMA error status. It should be called from
//! within the uDMA error interrupt handler to determine if a uDMA error
//! occurred.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return Returns non-zero if a uDMA error is pending.
//
//*****************************************************************************
__STATIC_INLINE uint32_t
uDMAErrorStatusGet(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Return the uDMA error status.
    return(HWREG(ui32Base + UDMA_O_ERROR));
}

//*****************************************************************************
//
//! \brief Clears the uDMA error interrupt.
//!
//! This function clears a pending uDMA error interrupt. It should be called
//! from within the uDMA error interrupt handler to clear the interrupt.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAErrorStatusClear(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Clear the uDMA error interrupt.
    HWREG(ui32Base + UDMA_O_ERROR) = UDMA_ERROR_STATUS;
}

//*****************************************************************************
//
//! \brief Enables a uDMA channel for operation.
//!
//! This function enables a specific uDMA channel for use. This function must
//! be used to enable a channel before it can be used to perform a uDMA
//! transfer.
//!
//! When a uDMA transfer is completed, the channel will be automatically
//! disabled by the uDMA controller. Therefore, this function should be called
//! prior to starting up any new transfer.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel number to enable.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAChannelEnable(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Set the bit for this channel in the enable set register.
    HWREG(ui32Base + UDMA_O_SETCHANNELEN) = 1 << ui32ChannelNum;
}

//*****************************************************************************
//
//! \brief Disables a uDMA channel for operation.
//!
//! This function disables a specific uDMA channel. Once disabled, a channel
//! will not respond to uDMA transfer requests until re-enabled via
//! \ref uDMAChannelEnable().
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel number to disable.
//!
//! \return None.
//
//*****************************************************************************
__STATIC_INLINE void
uDMAChannelDisable(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Set the bit for this channel in the enable clear register.
    HWREG(ui32Base + UDMA_O_CLEARCHANNELEN) = 1 << ui32ChannelNum;
}

//*****************************************************************************
//
//! \brief Checks if a uDMA channel is enabled for operation.
//!
//! This function checks to see if a specific uDMA channel is enabled.  This
//! can be used to check the status of a transfer, since the channel will
//! be automatically disabled at the end of a transfer.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel number to check.
//!
//! \return Returns status of uDMA channel.
//! - \c true  : Channel is enabled.
//! - \c false : Disabled.
//
//*****************************************************************************
__STATIC_INLINE bool
uDMAChannelIsEnabled(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // AND the specified channel bit with the enable register, and return the
    // result.
    return((HWREG(ui32Base + UDMA_O_SETCHANNELEN) & (1 << ui32ChannelNum)) ?
           true : false);
}

//*****************************************************************************
//
//! \brief Sets the base address for the channel control table.
//!
//! This function sets the base address of the channel control table. This
//! table resides in system memory and holds control information for each uDMA
//! channel.  The table must be aligned on a 1024 byte boundary. The base
//! address must be set before any of the channel functions can be used.
//! Setting the base address of the primary control table will automatically
//! set the address for the alternate control table as the next memory
//! location after the primary control table.
//!
//! The size of the channel control table depends on the number of uDMA
//! channels, and which transfer modes are used.  Refer to the introductory
//! text and the microcontroller datasheet for more information about the
//! channel control table.
//!
//! \note This register cannot be read when the controller is in the reset
//! state.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param pControlTable is a pointer to the 1024 byte aligned base address
//! of the uDMA channel control table. The address must be an absolute address
//! in system memory space.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAControlBaseSet(uint32_t ui32Base, void *pControlTable)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(((uint32_t)pControlTable & ~0x3FF) ==
           (uint32_t)pControlTable);
    ASSERT((uint32_t)pControlTable >= SRAM_BASE);

    // Program the base address into the register.
    HWREG(ui32Base + UDMA_O_CTRL) = (uint32_t)pControlTable;
}

//*****************************************************************************
//
//! \brief Gets the base address for the channel control table.
//!
//! This function gets the base address of the channel control table.  This
//! table resides in system memory and holds control information for each uDMA
//! channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return Returns a pointer to the base address of the channel control table.
//
//*****************************************************************************
__STATIC_INLINE void *
uDMAControlBaseGet(uint32_t ui32Base)
{
    // Check the arguments.

    ASSERT(uDMABaseValid(ui32Base));
    // Read the current value of the control base register, and return it to
    // the caller.
    return((void *)HWREG(ui32Base + UDMA_O_CTRL));
}

//*****************************************************************************
//
//! \brief Gets the base address for the channel control table alternate structures.
//!
//! This function gets the base address of the second half of the channel
//! control table that holds the alternate control structures for each channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return Returns a pointer to the base address of the second half of the
//! channel control table.
//
//*****************************************************************************
__STATIC_INLINE void *
uDMAControlAlternateBaseGet(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Read the current value of the control base register, and return it to
    // the caller.
    return((void *)HWREG(ui32Base + UDMA_O_ALTCTRL));
}

//*****************************************************************************
//
//! \brief Requests a uDMA channel to start a transfer.
//!
//! This function allows software to request a uDMA channel to begin a
//! transfer. This could be used for performing a memory to memory transfer,
//! or if for some reason a transfer needs to be initiated by software instead
//! of the peripheral associated with that channel.
//!
//! \note If the channel is a software channel and interrupts are used, then
//! the completion will be signaled on the uDMA dedicated interrupt. If a
//! peripheral channel is used, then the completion will be signaled on the
//! peripheral's interrupt.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel number on which to request a uDMA
//! transfer.
//!
//! \return None.
//
//*****************************************************************************
__STATIC_INLINE void
uDMAChannelRequest(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Set the bit for this channel in the software uDMA request register.
    HWREG(ui32Base + UDMA_O_SOFTREQ) = 1 << ui32ChannelNum;
}

//*****************************************************************************
//
//! \brief Enables attributes of a uDMA channel.
//!
//! This function is used to enable attributes of a uDMA channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel to configure.
//! \param ui32Attr is a combination of attributes for the channel.
//! The parameter is the bitwise OR of any of the following:
//! - \ref UDMA_ATTR_USEBURST is used to restrict transfers to use only a burst mode.
//! - \ref UDMA_ATTR_ALTSELECT is used to select the alternate control structure
//! for this channel (it is very unlikely that this flag should be used).
//! - \ref UDMA_ATTR_HIGH_PRIORITY is used to set this channel to high priority.
//! - \ref UDMA_ATTR_REQMASK is used to mask the hardware request signal from the
//! peripheral for this channel.
//!
//! \return None
//
//*****************************************************************************
extern void uDMAChannelAttributeEnable(uint32_t ui32Base,
                                       uint32_t ui32ChannelNum,
                                       uint32_t ui32Attr);

//*****************************************************************************
//
//! \brief Disables attributes of an uDMA channel.
//!
//! This function is used to disable attributes of a uDMA channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel to configure.
//! \param ui32Attr is a combination of attributes for the channel.
//! The parameter is the bitwise OR of any of the following:
//! - \ref UDMA_ATTR_USEBURST is used to restrict transfers to use only a burst mode.
//! - \ref UDMA_ATTR_ALTSELECT is used to select the alternate control structure
//! for this channel (it is very unlikely that this flag should be used).
//! - \ref UDMA_ATTR_HIGH_PRIORITY is used to set this channel to high priority.
//! - \ref UDMA_ATTR_REQMASK is used to mask the hardware request signal from the
//! peripheral for this channel.
//!
//! \return None
//
//*****************************************************************************
extern void uDMAChannelAttributeDisable(uint32_t ui32Base,
                                        uint32_t ui32ChannelNum,
                                        uint32_t ui32Attr);

//*****************************************************************************
//
//! \brief Gets the enabled attributes of a uDMA channel.
//!
//! This function returns a combination of flags representing the attributes of
//! the uDMA channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the channel to configure.
//!
//! \return Returns the bitwise OR of the attributes of the uDMA channel, which
//! can be any of the following:
//! - \ref UDMA_ATTR_USEBURST is used to restrict transfers to use only a burst mode.
//! - \ref UDMA_ATTR_ALTSELECT is used to select the alternate control structure
//! for this channel (it is very unlikely that this flag should be used).
//! - \ref UDMA_ATTR_HIGH_PRIORITY is used to set this channel to high priority.
//! - \ref UDMA_ATTR_REQMASK is used to mask the hardware request signal from the
//! peripheral for this channel.
//
//*****************************************************************************
extern uint32_t uDMAChannelAttributeGet(uint32_t ui32Base,
                                        uint32_t ui32ChannelNum);

//*****************************************************************************
//
//! \brief Sets the control parameters for a uDMA channel control structure.
//!
//! This function is used to set control parameters for a uDMA transfer.  These
//! are typically parameters that are not changed often.
//!
//! \note The address increment cannot be smaller than the data size.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelStructIndex is the bitwise OR of the uDMA channel number and:
//! - \ref UDMA_PRI_SELECT : Use primary data structure.
//! - \ref UDMA_ALT_SELECT : Use alternate data structure.
//! \param ui32Control is the bitwise OR of five values:
//! - Data size
//!   - \ref UDMA_SIZE_8  : 8 bits.
//!   - \ref UDMA_SIZE_16 : 16 bits.
//!   - \ref UDMA_SIZE_32 : 32 bits.
//! - Source address increment
//!   - \ref UDMA_SRC_INC_8    : 8 bits.
//!   - \ref UDMA_SRC_INC_16   : 16 bits.
//!   - \ref UDMA_SRC_INC_32   : 32 bits.
//!   - \ref UDMA_SRC_INC_NONE : Non-incrementing.
//! - Destination address increment
//!   - \ref UDMA_DST_INC_8    : 8 bits.
//!   - \ref UDMA_DST_INC_16   : 16 bits.
//!   - \ref UDMA_DST_INC_32   : 32 bits.
//!   - \ref UDMA_DST_INC_NONE : Non-incrementing.
//! - Arbitration size. Determines how many items are transferred before
//! the uDMA controller re-arbitrates for the bus. In power of 2.
//!   - \ref UDMA_ARB_1
//!   - \ref UDMA_ARB_2
//!   - \ref UDMA_ARB_4
//!   - \ref UDMA_ARB_8
//!   - ...
//!   - \ref UDMA_ARB_1024
//! - Force the channel to only respond to burst requests at the tail end of a scatter-gather transfer.
//!   - \ref UDMA_NEXT_USEBURST
//!
//! \return None
//
//*****************************************************************************
extern void uDMAChannelControlSet(uint32_t ui32Base,
                                  uint32_t ui32ChannelStructIndex,
                                  uint32_t ui32Control);

//*****************************************************************************
//
//! \brief Sets the transfer parameters for a uDMA channel control structure.
//!
//! This function is used to set the parameters for a uDMA transfer.  These are
//! typically parameters that are changed often. The function
//! \ref uDMAChannelControlSet() MUST be called at least once for this channel prior
//! to calling this function.
//!
//! The \c pvSrcAddr and \c pvDstAddr parameters are pointers to the first
//! location of the data to be transferred. These addresses should be aligned
//! according to the item size. The compiler will take care of this if the
//! pointers are pointing to storage of the appropriate data type.
//!
//! The two scatter/gather modes, MEMORY and PERIPHERAL, are actually different
//! depending on whether the primary or alternate control structure is
//! selected. This function will look for the \ref UDMA_PRI_SELECT and
//! \ref UDMA_ALT_SELECT flag along with the channel number and will set the
//! scatter/gather mode as appropriate for the primary or alternate control
//! structure.
//!
//! The channel must also be enabled using \ref uDMAChannelEnable() after calling
//! this function. The transfer will not begin until the channel has been set
//! up and enabled. Note that the channel is automatically disabled after the
//! transfer is completed, meaning that \ref uDMAChannelEnable() must be called
//! again after setting up the next transfer.
//!
//! \note Great care must be taken to not modify a channel control structure
//! that is in use or else the results will be unpredictable, including the
//! possibility of undesired data transfers to or from memory or peripherals.
//! For BASIC and AUTO modes, it is safe to make changes when the channel is
//! disabled, or the \ref uDMAChannelModeGet() returns \ref UDMA_MODE_STOP. For
//! PINGPONG or one of the SCATTER_GATHER modes, it is safe to modify the
//! primary or alternate control structure only when the other is being used.
//! The \ref uDMAChannelModeGet() function will return \ref UDMA_MODE_STOP when a
//! channel control structure is inactive and safe to modify.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelStructIndex is the bitwise OR of the uDMA channel number and:
//! - \ref UDMA_PRI_SELECT : Use primary data structure.
//! - \ref UDMA_ALT_SELECT : Use alternate data structure.
//! \param ui32Mode is the type of uDMA transfer.
//! The parameter should be one of the following values:
//! - \ref UDMA_MODE_STOP     : Stops the uDMA transfer. The controller sets the mode
//! to this value at the end of a transfer.
//! - \ref UDMA_MODE_BASIC    : Perform a basic transfer based on request.
//! - \ref UDMA_MODE_AUTO to perform a transfer that will always complete once
//! started even if request is removed.
//! - \ref UDMA_MODE_PINGPONG : Set up a transfer that switches between the
//! primary and alternate control structures for the channel. This allows
//! use of ping-pong buffering for uDMA transfers.
//! - \ref UDMA_MODE_MEM_SCATTER_GATHER : Set up a memory scatter-gather transfer.
//! - \ref UDMA_MODE_PER_SCATTER_GATHER : Set up a peripheral scatter-gather transfer.
//! \param pvSrcAddr is the source address for the transfer.
//! \param pvDstAddr is the destination address for the transfer.
//! \param ui32TransferSize is the number of data items to transfer (\b NOT bytes).
//!
//! \return None
//
//*****************************************************************************
extern void uDMAChannelTransferSet(uint32_t ui32Base,
                                   uint32_t ui32ChannelStructIndex,
                                   uint32_t ui32Mode, void *pvSrcAddr,
                                   void *pvDstAddr, uint32_t ui32TransferSize);

//*****************************************************************************
//
//! \brief Configures a uDMA channel for scatter-gather mode.
//!
//! This function is used to configure a channel for scatter-gather mode.
//! The caller must have already set up a task list, and pass a pointer to
//! the start of the task list as the \c pvTaskList parameter.
//!
//! The \c ui32TaskCount parameter is the count of tasks in the task list, not the
//! size of the task list.
//!
//! The flag \c bIsPeriphSG should be used to indicate
//! if the scatter-gather should be configured for a peripheral or memory
//! scatter-gather operation.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is the uDMA channel number.
//! \param ui32TaskCount is the number of scatter-gather tasks to execute.
//! \param pvTaskList is a pointer to the beginning of the scatter-gather
//! task list.
//! \param ui32IsPeriphSG is a flag to indicate it is a peripheral
//! scatter-gather transfer (else it will be memory scatter-gather transfer)
//!
//! \return None
//!
//! \sa \ref uDMATaskStructEntry()
//
//*****************************************************************************
extern void uDMAChannelScatterGatherSet(uint32_t ui32Base,
                                        uint32_t ui32ChannelNum,
                                        uint32_t ui32TaskCount,
                                        void *pvTaskList,
                                        uint32_t ui32IsPeriphSG);

//*****************************************************************************
//
//! \brief Gets the current transfer size for a uDMA channel control structure.
//!
//! This function is used to get the uDMA transfer size for a channel. The
//! transfer size is the number of items to transfer, where the size of an item
//! might be 8, 16, or 32 bits. If a partial transfer has already occurred,
//! then the number of remaining items will be returned. If the transfer is
//! complete, then 0 will be returned.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelStructIndex is the bitwise OR of the uDMA channel number and:
//! - \ref UDMA_PRI_SELECT
//! - \ref UDMA_ALT_SELECT
//!
//! \return Returns the number of items remaining to transfer.
//
//*****************************************************************************
extern uint32_t uDMAChannelSizeGet(uint32_t ui32Base,
                                   uint32_t ui32ChannelStructIndex);

//*****************************************************************************
//
//! \brief Gets the transfer mode for a uDMA channel control structure.
//!
//! This function is used to get the transfer mode for the uDMA channel. It
//! can be used to query the status of a transfer on a channel. When the
//! transfer is complete the mode will be \ref UDMA_MODE_STOP.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelStructIndex is the bitwise OR of the uDMA channel number and:
//! - \ref UDMA_PRI_SELECT
//! - \ref UDMA_ALT_SELECT
//!
//! \return Returns the transfer mode of the specified channel and control
//! structure, which will be one of the following values:
//! - \ref UDMA_MODE_STOP
//! - \ref UDMA_MODE_BASIC
//! - \ref UDMA_MODE_AUTO
//! - \ref UDMA_MODE_PINGPONG
//! - \ref UDMA_MODE_MEM_SCATTER_GATHER
//! - \ref UDMA_MODE_PER_SCATTER_GATHER
//
//*****************************************************************************
extern uint32_t uDMAChannelModeGet(uint32_t ui32Base,
                                   uint32_t ui32ChannelStructIndex);

//*****************************************************************************
//
//! \brief Registers an interrupt handler for the uDMA controller in the dynamic interrupt table.
//!
//! \note Only use this function if you want to use the dynamic vector table (in SRAM)!
//!
//! This function registers a function as the interrupt handler for a specific
//! interrupt and enables the corresponding interrupt in the interrupt controller.
//!
//! \note The interrupt handler for uDMA is for transfer completion when the
//! software channel is used, and for error interrupts. The interrupts for each
//! peripheral channel are handled through the individual peripheral interrupt
//! handlers.
//!
//! \param ui32Base is the base address of the uDMA module.
//! \param ui32IntChannel specifies which uDMA interrupt is to be registered.
//! - \c INT_DMA_DONE_COMB : Register an interrupt handler to process interrupts
//!   from the uDMA software channel.
//! - \c INT_DMA_ERR : Register an interrupt handler to process uDMA error
//!   interrupts.
//! \param pfnHandler is a pointer to the function to be called when the
//! interrupt is activated.
//!
//! \return None
//!
//! \sa \ref IntRegister() for important information about registering interrupt
//! handlers.
//
//*****************************************************************************
__STATIC_INLINE void
uDMAIntRegister(uint32_t ui32Base, uint32_t ui32IntChannel,
                void (*pfnHandler)(void))
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(pfnHandler);
    ASSERT((ui32IntChannel == INT_DMA_DONE_COMB) || (ui32IntChannel == INT_DMA_ERR));

    // Register the interrupt handler.
    IntRegister(ui32IntChannel, pfnHandler);

    // Enable the memory management fault.
    IntEnable(ui32IntChannel);
}

//*****************************************************************************
//
//! \brief Unregisters an interrupt handler for the uDMA controller in the dynamic interrupt table.
//!
//! This function will disable and clear the handler to be called for the
//! specified uDMA interrupt.
//!
//! \param ui32Base is the base address of the uDMA module.
//! \param ui32IntChannel specifies which uDMA interrupt to unregister.
//! - \c INT_DMA_DONE_COMB : Register an interrupt handler to process interrupts
//!   from the uDMA software channel.
//! - \c INT_DMA_ERR : Register an interrupt handler to process uDMA error
//!   interrupts.
//!
//! \return None
//!
//! \sa \ref IntRegister() for important information about registering interrupt
//! handlers.
//
//*****************************************************************************
__STATIC_INLINE void
uDMAIntUnregister(uint32_t ui32Base, uint32_t ui32IntChannel)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT((ui32IntChannel == INT_DMA_DONE_COMB) || (ui32IntChannel == INT_DMA_ERR));

    // Disable the interrupt.
    IntDisable(ui32IntChannel);

    // Unregister the interrupt handler.
    IntUnregister(ui32IntChannel);
}

//*****************************************************************************
//
//! \brief Clears uDMA interrupt done status.
//!
//! Clears bits in the uDMA interrupt status register according to which bits
//! are set in \c ui32ChanMask. There is one bit for each channel. If a a bit
//! is set in \c ui32ChanMask, then that corresponding channel's interrupt
//! status will be cleared (if it was set).
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChanMask is a 32-bit mask with one bit for each uDMA channel.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAIntClear(uint32_t ui32Base, uint32_t ui32ChanMask)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Clear the requested bits in the uDMA interrupt status register.
    HWREG(ui32Base + UDMA_O_REQDONE) = ui32ChanMask;
}

//*****************************************************************************
//
//! \brief Get the uDMA interrupt status.
//!
//! This function returns the interrupt status for the specified UDMA. This
//! function does not differentiate between software or hardware activated
//! interrupts.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE uint32_t
uDMAIntStatus(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Return the uDMA interrupt status register.
    return (HWREG(ui32Base + UDMA_O_REQDONE));
}

//*****************************************************************************
//
//! \brief Enable interrupt on software event driven uDMA transfers.
//!
//! \note The main purpose of this function is to prevent propagation of uDMA
//! status signals to a peripheral, if a peripheral and a software event is
//! sharing the uDMA channel. If it is desired to initiate a transfer by
//! writing to a register inside the uDMA (this means a software driven
//! channel), then the uDMA status signals propagation need to be blocked to
//! the hardware peripherals.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32IntChannel identifies which uDMA interrupt to enable software
//!        interrupts for.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAIntSwEventEnable(uint32_t ui32Base, uint32_t ui32IntChannel)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32IntChannel < UDMA_NUM_CHANNELS);

    // Enable the channel.
    HWREGBITW(ui32Base + UDMA_O_DONEMASK, ui32IntChannel) = 1;
}

//*****************************************************************************
//
//! \brief Disable interrupt on software event driven uDMA transfers.
//!
//! This register disables the blocking of the uDMA status signals propagation
//! to the hardware peripheral connected to the uDMA on the \c ui32IntChannel.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32IntChannel identifies which uDMA interrupt to disable software
//!        interrupts for.
//!
//! \return None
//!
//! \sa \ref uDMAIntSwEventEnable()
//
//*****************************************************************************
__STATIC_INLINE void
uDMAIntSwEventDisable(uint32_t ui32Base, uint32_t ui32IntChannel)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32IntChannel < UDMA_NUM_CHANNELS);

    // Disable the SW channel.
    HWREGBITW(ui32Base + UDMA_O_DONEMASK, ui32IntChannel) = 0;
}

//*****************************************************************************
//
//! \brief Return the status of the uDMA module.
//!
//! \note This status register cannot be read when the controller is in the reset state.
//!
//! \param ui32Base is the base address of the uDMA port.
//!
//! \return Current status of the uDMA module.
//
//*****************************************************************************
__STATIC_INLINE uint32_t
uDMAGetStatus(uint32_t ui32Base)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));

    // Read and return the status register.
    return HWREG(ui32Base + UDMA_O_STATUS);
}

//*****************************************************************************
//
//! \brief Set the priority of a uDMA channel.
//!
//! \note Writing 0 to a bit has no effect on the priority. To reset a channel
//! priority to the default value use \ref uDMAChannelPriorityClear().
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum is uDMA channel to set the priority for.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAChannelPrioritySet(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Set the channel priority to high.
    HWREG(ui32Base + UDMA_O_SETCHNLPRIORITY) = 1 << ui32ChannelNum;
}

//*****************************************************************************
//
//! \brief Get the priority of a uDMA channel.
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum The uDMA channel to get the priority for.
//!
//! \return Returns one of:
//! - \ref UDMA_PRIORITY_HIGH
//! - \ref UDMA_PRIORITY_LOW
//
//*****************************************************************************
__STATIC_INLINE bool
uDMAChannelPriorityGet(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Return the channel priority.
    return(HWREG(ui32Base + UDMA_O_SETCHNLPRIORITY) & (1 << ui32ChannelNum) ?
           UDMA_PRIORITY_HIGH : UDMA_PRIORITY_LOW);
}

//*****************************************************************************
//
//! \brief Clear the priority of a uDMA channel.
//!
//! \note Writing 0 to a bit has no effect on the priority. To set a channel
//! priority to high use \ref uDMAChannelPrioritySet().
//!
//! \param ui32Base is the base address of the uDMA port.
//! \param ui32ChannelNum The uDMA channel to clear the priority for.
//!
//! \return None
//
//*****************************************************************************
__STATIC_INLINE void
uDMAChannelPriorityClear(uint32_t ui32Base, uint32_t ui32ChannelNum)
{
    // Check the arguments.
    ASSERT(uDMABaseValid(ui32Base));
    ASSERT(ui32ChannelNum < UDMA_NUM_CHANNELS);

    // Clear the channel priority.
    HWREG(ui32Base + UDMA_O_CLEARCHNLPRIORITY) = 1 << ui32ChannelNum;
}

//*****************************************************************************
//
// Support for DriverLib in ROM:
// Redirect to implementation in ROM when available.
//
//*****************************************************************************
#if !defined(DRIVERLIB_NOROM) && !defined(DOXYGEN)
    #include "../driverlib/rom.h"
    #ifdef ROM_uDMAChannelAttributeEnable
        #undef  uDMAChannelAttributeEnable
        #define uDMAChannelAttributeEnable      ROM_uDMAChannelAttributeEnable
    #endif
    #ifdef ROM_uDMAChannelAttributeDisable
        #undef  uDMAChannelAttributeDisable
        #define uDMAChannelAttributeDisable     ROM_uDMAChannelAttributeDisable
    #endif
    #ifdef ROM_uDMAChannelAttributeGet
        #undef  uDMAChannelAttributeGet
        #define uDMAChannelAttributeGet         ROM_uDMAChannelAttributeGet
    #endif
    #ifdef ROM_uDMAChannelControlSet
        #undef  uDMAChannelControlSet
        #define uDMAChannelControlSet           ROM_uDMAChannelControlSet
    #endif
    #ifdef ROM_uDMAChannelTransferSet
        #undef  uDMAChannelTransferSet
        #define uDMAChannelTransferSet          ROM_uDMAChannelTransferSet
    #endif
    #ifdef ROM_uDMAChannelScatterGatherSet
        #undef  uDMAChannelScatterGatherSet
        #define uDMAChannelScatterGatherSet     ROM_uDMAChannelScatterGatherSet
    #endif
    #ifdef ROM_uDMAChannelSizeGet
        #undef  uDMAChannelSizeGet
        #define uDMAChannelSizeGet              ROM_uDMAChannelSizeGet
    #endif
    #ifdef ROM_uDMAChannelModeGet
        #undef  uDMAChannelModeGet
        #define uDMAChannelModeGet              ROM_uDMAChannelModeGet
    #endif
#endif

//*****************************************************************************
//
// Mark the end of the C bindings section for C++ compilers.
//
//*****************************************************************************
#ifdef __cplusplus
}
#endif

#endif //  __UDMA_H__

//*****************************************************************************
//
//! Close the Doxygen group.
//! @}
//! @}
//
//*****************************************************************************