efsl_spi.c

efsl-0.2.8(sd card 文件系统 fat)

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//


#include "sd.h"
#include "config.h"
#include "types.h"

//#include "SdHal.h"
//--------------->这个是arm 的spi 底层函数
#include "spi.h"
 //==========================================接口
void SD_HardWareInit(void)
{
	SPI_IO_INIT();
	SPIMOSILow();
	SPICSHigh();
	//延时500mS--->内核延时
	OSTimeDly(200);
	SPI_Flash_RST(); 
	SPICSLow(); 
	//延时20mx--->内核延时
	OSTimeDly(4);
	SPI_IO_INIT();
}

void SPI_CS_Enable(void)
 {
 	  //cs enable
	  SPICSLow();
	  //spi start	->only one task using spi
	  SPIStart();
 
 }

void  SPI_CS_Disable()
{
	   //cs disable
	   SPICSHigh();
	   //spi end	->only one task using spi
	   SPIEnd();
}

void SPI_TxBYTE(euint8 outgoing)
{
	uint8 error = SPIWrite((uint8)outgoing); 
}

euint8 SPI_RxBYTE()
{
	uint8 buff=0;
	uint8 error = SPIRead(&buff);
	return buff;
}


// walter 20080909
esint8 if_initInterface(hwInterface* file, eint8* opts)
{
	euint32 sc;
	esint8 res;
	
	if_spiInit(file); /* init hardware */

    SPI_CS_Enable();    
    res = sd_Init(file);
    SPI_CS_Disable(); 
    
	if(res<0)	{
		DBG(TXT("Card failed to init, breaking up...\n"));
		return(-1);
	}
	
    SPI_CS_Enable();    
    res = sd_State(file);
    SPI_CS_Disable(); 
    
	if(res<0)	{
		DBG(TXT("Card didn't return the ready state, breaking up...\n"));
		return(-2);
	}

    SPI_CS_Enable();    
	sd_getDriveSize(file, &sc);
    SPI_CS_Disable(); 
	file->sectorCount = sc/512;
	if( (sc%512) != 0) {
		file->sectorCount--;
	}
	DBG(TXT("Drive Size is %lu Bytes (%lu Sectors)\n"), sc, file->sectorCount);

	DBG(TXT("Init done...\n"));
	return(0);
}
/*****************************************************************************/ 

esint8 if_readBuf(hwInterface* file,euint32 address,euint8* buf)
{
    esint8 res;

    SPI_CS_Enable();    
	res = sd_readSector(file,address,buf,512);
    SPI_CS_Disable(); 

    return res;
}
/*****************************************************************************/

esint8 if_writeBuf(hwInterface* file,euint32 address,euint8* buf)
{
    esint8 res;

    SPI_CS_Enable();    
	res = sd_writeSector(file,address, buf);
    SPI_CS_Disable(); 

    return res;
}


/*****************************************************************************/ 

// Utility-functions which does not toogle CS.
// Only needed during card-init. During init
// the automatic chip-select is disabled for SSP


void if_spiSend(hwInterface *iface,euint8 outgoing)
{
	SPI_TxBYTE(outgoing) ;
}

euint8 if_spiRead(void)
{
    return SPI_RxBYTE();
}
/*****************************************************************************/ 
void if_spiInit(hwInterface *iface)
{
	SD_HardWareInit();
}
/*****************************************************************************/