scu2spi.c

这是单板上DPRAM的驱动程序

#include <string.h>
#include "board.h"
#include "bspcomm.h"
#include "bspspec.h"
#include "bspspi.h"
#include "scu2spi.h"
#include "sdev.h"

static void Delaynns(ULONG ns)
{
    volatile int p=0;
    ns/=100;
    while(ns-- > 0)p++;
}

static int ScuSpiRead(void *pDataBuf,void *pBuf, int MaxLen)         
{   
    return BDRead(pDataBuf,(char *)pBuf,MaxLen);
}

static int ScuSpiWrite(void *pDataBuf,void *pBuf, int MaxLen)         
{   
    int ret=BDWrite(pDataBuf,(char *)pBuf,MaxLen);
    if(ret>=0)S_SPICommandReg = BIT7;
    return ret;
}

static int ScuSpiCntrl(void *pDataBuf, int cmd, void *pParam, int maxlen)
{
    int i;
    ULONG temp_ulong;
    /*PDA *pda= (PDA *)(GetIMMR() & IO_MAP_MASK); */
    DataBufStruct *pData=(DataBufStruct *)pDataBuf;
    SpiCfgStruct*   pCfg =(SpiCfgStruct *)(pData+1);
    int ret=SpiCntrl(pDataBuf, cmd, pParam, maxlen);
    if(ret!=SDE_UNKNOW_CMD)return ret;
    switch(cmd)
    {
        case SDC_SEL_SLAVE:
            if(maxlen!=sizeof(int))return SDE_INVALID_ARG;
            if(*(int *)pParam!=0 && *(int *)pParam != 1 && *(int *)pParam != 2)
                return SDE_INVALID_ARG;
                
            SET_PD_BIT(7,  1)
            SET_PD_BIT(13, 1)
            
            pCfg->ch=*(int *)pParam;
            if(pCfg->ch ==0) SET_PD_BIT(7,  0)
            else if(pCfg->ch==1) SET_PD_BIT(13,  0)
            else return SDE_INVALID_ARG;
            break; 
        case SDC_CLOSE:
            if(pCfg->ch==0) SET_PD_BIT(7,  1)
            else if(pCfg->ch==1) SET_PD_BIT(13,  1)
            else return SDE_INVALID_SLAVE; 
            break;

        case SDC_PROGRAM_MODE:
        case SDC_RESET:
            if(pCfg->ch==0) SET_PD_BIT(14,  1)
            else if(pCfg->ch==1) SET_PD_BIT(15,  1)
            else return SDE_INVALID_SLAVE; 
            break;

        case SDC_RUN:
            if(pCfg->ch ==0) SET_PD_BIT(14,  0)
            else if(pCfg->ch==1) SET_PD_BIT(15,  0)
            else return SDE_INVALID_ARG;
            break;

        default: 
            return SDE_UNKNOW_CMD;

    }/* end of switch(cmd) */
    return SDE_OK;
}

char *ScuSpiBspInit(int DEV, char *FreeMemPtr, SpiCfgStruct *cfg)
{
    cfg->UncachedBuffer
        =AllocUncachedBuffer((cfg->MaxRecvBD+cfg->MaxSendBD)*cfg->MaxBufLen,4);
    InstallSD(DEV,ScuSpiRead,ScuSpiWrite,ScuSpiCntrl,FreeMemPtr);
    SpiInit(FreeMemPtr, cfg); 
    FreeMemPtr += sizeof(DataBufStruct)+sizeof(SpiCfgStruct);
    memcpy(FreeMemPtr,"**ScuSpi",8);
    FreeMemPtr += 8;
    return FreeMemPtr;
}