dmad.h

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/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the disclaimer below.
 *
 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL 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
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 */

//------------------------------------------------------------------------------
/// \unit
///
/// !!!Purpose
/// 
/// The %Dma driver is a high level dma driver which performs DMA device Initializes,
/// tansfer mode configuration and dma transfer. 
///  
/// !!!Usage
/// 
/// -# Initializes a %Dma controller and dma transfer instance.
///    Initializes dma for specified channel using DMAD_Initialize().
/// -# Configures the %Dma transfer buffer by giving transfer mode, transfer mode 
///    for source peripheral and destination peripheral could be single buffer or 
///    multi-buffer(LLI/auto-reload/contiguous buffers) with or without 
///    Picture-In-Picture mode. 
///    DMAD_Configure_Buffer()
/// \code
///   // Configure multi-buffer transfer with source address auto-reloaded and
///      contiguous destination address.
///    DMAD_Configure_Buffer(DMA_CHANNEL_1, 
///                          DMA_TRANSFER_RELOAD, 
///                          DMA_TRANSFER_CONTIGUOUS, 
///                          0, 
///                          0);
/// \endcode
/// -# Configures the %Dma characteristics (such as source/destination 
///    single transfer width, buffer transfer size and source/destionation
///    start addreass for the device corresponding to the specified channle 
///    using DMAD_Configure_TransferController().
/// -# Starts a %Dma transfer using DMAD_BufferTransfer().
///    The transfer is performed using the %Dma channels.
///    -# Initialize the total size to be transfered.
///    -# Initialize the callback function if specified.
///    -# Enable the interrupt for specified %dma channel.
///    -# Enable the specified %dma channel.
///    -# Example for transfering buffer through the %Dma. 
/// \code
///     // Start channel 1 transfer. Source image auto-reload 4 times.
///     and transfer to destination continguous.
///     DMAD_BufferTransfer(DMA_CHANNEL_1, bufferSize * 4, TestCallback, 0);
///     while (!DMAD_IsFinished(DMA_CHANNEL_1));
/// \endcode
/// -# The DMAD_Handler() must be called by the DMA Interrupt Service Routine 
///    with the corresponding %Dma instance. It is invokes to check for pending
///    interrupts. 
///    - Example for initializing %Dma interrupt handler in upper application.
/// \code
///       AIC_ConfigureIT(AT91C_ID_HDMA, 0, DMAD_Handler);
/// \endcode
//------------------------------------------------------------------------------

#ifndef DMAD_H
#define DMAD_H

//------------------------------------------------------------------------------
//         Global definitions
//------------------------------------------------------------------------------
/// DMA driver is currently busy.
#define DMAD_ERROR_BUSY              1


//------------------------------------------------------------------------------
//         Types
//------------------------------------------------------------------------------

/// DMA driver callback function.
typedef void (*DmaCallback)();

//------------------------------------------------------------------------------
/// DMA multi buffer transfer Linker List Item structure.
//------------------------------------------------------------------------------
typedef struct _DmaLinkList {
    /// Source address.
    unsigned int sourceAddress;
    /// Destination address.
    unsigned int destAddress;
    /// Control A value.
    unsigned int controlA;
    /// Control B value.
    unsigned int controlB;
    /// Descriptor Address.
    unsigned int descriptor;
} DmaLinkList;

//------------------------------------------------------------------------------
/// DMA picture-in-picture mode configuration structure. 
//------------------------------------------------------------------------------
typedef struct _PictureInPicture {
    /// Size in byte add to the source address in PIP.
    unsigned short pipSourceHoleSize;
    /// Number of transfer in byte to perform before the source address increase.
    unsigned short pipSourceBoundarySize;
    /// Size in byte add to the destination address in PIP.
    unsigned short pipDestHoleSize;
    /// Number of transfer in byte to perform before the destination address increase.
    unsigned short pipDestBoundarySize;
} PictureInPicture;


//------------------------------------------------------------------------------
//         Global functions
//------------------------------------------------------------------------------
extern void DMAD_Initialize(unsigned char channel);
                     
extern unsigned char DMAD_Configure_Buffer(unsigned char channel, 
                             unsigned char sourceTransferMode,
                             unsigned char destTransferMode,
                             DmaLinkList *lli,
                             PictureInPicture *pip);

extern unsigned char DMAD_Configure_TransferController(unsigned char channel,
                                             unsigned int bufSize,
                                             unsigned char sourceWidth,
                                             unsigned char destWidth,
                                             unsigned int sourceAddress,
                                             unsigned int destAddress);
                                 
extern unsigned char DMAD_BufferTransfer(unsigned char channel, 
                                         unsigned int size, 
                                         DmaCallback callback, 
                                         unsigned char polling);

extern unsigned char DMAD_IsFinished(unsigned char channel);

#endif //#ifndef DMAD_H