preset.c

来自「bf533音訊處理 使用visual audio 軟件」· C语言 代码 · 共 122 行

// Copyright(c) 2005 Analog Devices, Inc. All Rights Reserved.
// This software is proprietary and confidential to Analog Devices, Inc. and its licensors.

// File    : $Id: //depot/Development/VisualAudio/Platforms/EZKit_BF533_Basic/2.5.0/preset.c#2 $ 
// Part of : VisualAudio V2.5.0 
// Updated : $Date: 2006/10/12 $ by $Author: Fernando $


/*
 *  Name:            Preset.c
 *    Description:    Load the preset from the flash
 *
 *    Owner:            Analog Devices
 *
 *    Revision:
 *
 *    M. Guo            05 Jan 2005            Initial Revision
 */


#include <stdlib.h>
#include "Basic.h" // Has definition for PRESETS_IN_FLASH
#include "VALayout1Presets.h"

#if (Layout1_COMPILED_PRESET_COUNT==0)

// Dummy function
int SYS_ApplyPreset(unsigned int nPresetOffset) {
    return 0;
}

#else

#define NEXT_ADDRESS(_addr) (_addr) += 4

#define PRESET_BASE_ADDRESS ((unsigned int)(&Layout1_Presets[0]))

#if PRESETS_IN_FLASH
// Presets in flash
#ifndef NO_OPTIMIZE
#pragma optimize_for_space
#endif
static int getPresetElement(int *nAddress,int *pResult,void *pContext)
{
    // temp holder
    int nValue = 0x0;
    int nAddr = *nAddress;

    // get the address from the start of flash and put it in a P register
    asm ("r3 = %0;": : "d" (nAddr) );
    asm ("p2 = r3;");
    
    // now place it into memory
    asm ("SSYNC;");
    asm ("%0 = [p2];": "=d" (nValue) : );
    asm ("SSYNC;");

    NEXT_ADDRESS(nAddr);
    *nAddress = nAddr;
    // put the value at the location passed in
    *pResult = nValue;

    // ok
    return E_NO_ERROR;
}
#else
#ifndef NO_OPTIMIZE
#pragma optimize_for_space
#endif
static int getPresetElement(int *nAddress,int *pResult,void *pContext)
{
    int addr = *nAddress;
    *pResult = *(int*)addr;
    NEXT_ADDRESS(addr);
    *nAddress = addr;
    return E_NO_ERROR;
}
#endif

////////////////////////////////////////////////////////////////////////////////////////////
//  SYS_ApplyPreset
//
//    Description:
//        Read preset and apply it to the specified destination
//
//Arguments:    
//    nPresetOffset - Offset value into preset, in words (not bytes). This is a linear address.
//
// Returns:
//    Error code.
////////////////////////////////////////////////////////////////////////////////////////////

#ifndef NO_OPTIMIZE
#pragma optimize_for_space
#endif
int SYS_ApplyPreset(unsigned int nPresetOffset)
{
    int addr = 0;
    
    // If the high bit of nPresetOffset is set, it will cause interrupts to be masked while the preset is applied.  
    // Otherwise, interrupts will not be masked.
    bool bAtomic = ((nPresetOffset & AMFStructuredSetting_ATOMIC) != 0);

    // get the flash address
    // Mask the high bit of nPresetOffset to get actual offset
    addr = (4*(nPresetOffset & ~AMFStructuredSetting_ATOMIC)) + PRESET_BASE_ADDRESS;
    return AMF_ApplyPreset(addr, (AMF_GetPresetElementFunc)getPresetElement, NULL, bAtomic);
}

#endif