sd.c

SD卡的分析源码

#include <stdio.h>
#include <string.h>
#include "def.h"
#include "option.h"
#include "2440addr.h"
#include "2440lib.h"
#include "sdi.h"


#define INICLK	300000
#define SDCLK	24000000	//PCLK=49.392MHz
#define MMCCLK	15000000	//PCLK=49.392MHz

#define POL	0
#define INT	1
#define DMA	2

int CMD13(void);    // Send card status
int CMD9(void);


unsigned int *Tx_buffer;	//128[word]*16[blk]=8192[byte]
unsigned int *Rx_buffer;	//128[word]*16[blk]=8192[byte]
volatile unsigned int rd_cnt;
volatile unsigned int wt_cnt;
volatile unsigned int block;
volatile unsigned int TR_end=0;

int Wide=0; // 0:1bit, 1:4bit
int MMC=0;  // 0:SD  , 1:MMC

int  Maker_ID;
char Product_Name[7]; 
int  Serial_Num;

volatile int RCA;

void Test_SDI(void)
{
	U32 save_rGPEUP, save_rGPECON;
	
    RCA=0;
    MMC=0;
    block=3072;   //3072Blocks=1.5MByte, ((2Block=1024Byte)*1024Block=1MByte)

	save_rGPEUP=rGPEUP;
	save_rGPECON=rGPECON;
	
    rGPEUP  = 0xf83f;     // SDCMD, SDDAT[3:0] => PU En.
    rGPECON = 0xaaaaaaaa;	//SDCMD, SDDAT[3:0]


    Uart_Printf("\nSDI Card Write and Read Test\n");
    
    if(!SD_card_init())
	return;
    
    TR_Buf_new();

    Wt_Block();
	
    Rd_Block();
    View_Rx_buf();

    if(MMC)
	TR_Buf_new();
    
    if(MMC)
    {
		rSDICON |=(1<<5);    // YH 0519, MMC Type SDCLK

		Wt_Stream();
		Rd_Stream();
		View_Rx_buf();
    }

    Card_sel_desel(0);	// Card deselect

    if(!CMD9())
	Uart_Printf("Get CSD fail!!!\n");
    rSDIDCON=0;//tark???
    rSDICSTA=0xffff;
	rGPEUP=save_rGPEUP;
	rGPECON=save_rGPECON;	
}

void TR_Buf_new(void)
{
    //-- Tx & Rx Buffer initialize
    int i, j;

    Tx_buffer=(unsigned int *)0x31000000;

    j=0;
    for(i=0;i<2048;i++)	//128[word]*16[blk]=8192[byte]
	*(Tx_buffer+i)=i+j;
    Flush_Rx_buf();

}

void Flush_Rx_buf(void)
{
    //-- Flushing Rx buffer 
    int i;

    Rx_buffer=(unsigned int *)0x31800000;

    for(i=0;i<2048;i++)	//128[word]*16[blk]=8192[byte]
	*(Rx_buffer+i)=0;
    Uart_Printf("End Rx buffer flush\n");
}

void View_Rx_buf()
{
    //-- Display Rx buffer 
    int i,error=0;

    Tx_buffer=(unsigned int *)0x31000000;
    Rx_buffer=(unsigned int *)0x31800000;

    Uart_Printf("Check Rx data\n");

    for(i=0;i<128*block;i++)
    {
        if(Rx_buffer[i] != Tx_buffer[i])
		{
		    Uart_Printf("\nTx/Rx error\n"); 
		    Uart_Printf("%d:Tx-0x%08x, Rx-0x%08x\n",i,Tx_buffer[i], Rx_buffer[i]);
		    error=1;
		    break;
        }
		//Uart_Printf(".");
    }
    
    if(!error)
    {
		Uart_Printf("\nThe Tx_buffer is same to Rx_buffer!\n");
		Uart_Printf("SD CARD Write and Read test is OK!\n");
	}
}

void View_Tx_buf(void)
{

}


int SD_card_init(void) //SD卡初始化

{
//-- SD controller & card initialize 
    int i;
    /* Important notice for MMC test condition */
    /* Cmd & Data lines must be enabled by pull up resister */
    rSDIPRE=PCLK/(INICLK)-1; // 400KHz

 Uart_Printf("Init. Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
    
 rSDICON=(1<<4)|1; //先传高位，再传低位，使能CLK

 rSDIFSTA=rSDIFSTA|(1<<16); //SDI FIFO status register，FIFO复位

    rSDIBSIZE=0x200; // SDI block size register，设置每块大小为512byte(128word)

    rSDIDTIMER=0x7fffff; // SDI data / busy timer register，设置超时周期

    for(i=0;i<0x1000;i++); // 延时，CARD自身初始化需要74个CLK

    CMD0(); //发送CMD0

    Uart_Printf("In idle\n");
    //-- Check MMC card OCR

    if(Chk_MMC_OCR()) 
    {
 Uart_Printf("In MMC ready\n");
 MMC=1;
 goto RECMD2;
    }
    Uart_Printf("MMC check end!!\n");
    //-- Check SD card OCR

    if(Chk_SD_OCR()) 
        Uart_Printf("In SD ready\n");
    else
    {
  Uart_Printf("Initialize fail\nNo Card assertion\n");
        return 0;
    }
RECMD2:
//检查连接的卡，识别卡的状态
    rSDICARG=0x0; // CMD2(stuff bit)

rSDICCON=(0x1<<10)|(0x1<<9)|(0x1<<8)|0x42; //CMD2为长应答并等待应答,开始发

//送CMD2,命令卡发回CID寄存器(保存了生产厂家/时间/批号等等),产生RSP2

   //检查CMD2是否成功发送并收到响应

    if(!Chk_CMDend(2, 1)) 
 goto RECMD2; //CMD2出错，重新发送

    rSDICSTA=0xa00; // 清除命令和应答结束标志位

    Uart_Printf("End id\n");
RECMD3:
    //--发送CMD3，给卡分配RCA,

    rSDICARG=MMC<<16; //CMD3参数， MMC：设置 RCA, SD：请求发RCA

rSDICCON=(0x1<<9)|(0x1<<8)|0x43; //CMD3为短应答并等待应答,开始发

//送CMD3, MMC（设置RCA,产生RSP1）,SD（设置RCA,产生RSP6）

   //检查CMD3是否成功发送并收到响应

    if(!Chk_CMDend(3, 1)) 
 goto RECMD3; //CMD3出错，重新发送

    rSDICSTA=0xa00; // 清除命令和应答结束标志位

    //--Publish RCA

    if(MMC) {
     RCA=1;
        rSDIPRE=(PCLK/MMCCLK)-1; 
        Uart_Printf("MMC Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
     }
    else 
     {
   RCA=( rSDIRSP0 & 0xffff0000 )>>16; //回读RCA,卡被分配RCA后进入//TransferMODE,准备读写

      Uart_Printf("RCA=0x%x\n",RCA);
   rSDIPRE=PCLK/(SDCLK)-1; // Normal clock=25MHz

   Uart_Printf("SD Frequency is %dHz\n",(PCLK/(rSDIPRE+1)));
     } //--State(stand-by) check

//根据SD规范，rSDIRSP0高16位存储RCA，低16位存储CARD的状态

    if( rSDIRSP0 & 0x1e00!=0x600 ) // 检查CARD状态，不是处于stand-by状态

 goto RECMD3; ////未就绪，重新发送CMD3 

    Uart_Printf("In stand-by\n");
    
    Card_sel_desel(1); // Select

    if(!MMC) //若位SD卡，设置4bit的数据传输模式

 Set_4bit_bus();
    else //若位MMC卡，设置1bit的数据传输模式

 Set_1bit_bus();
    return 1;
}


void Card_sel_desel(char sel_desel)
{
    //-- Card select or deselect
    if(sel_desel)
    {
RECMDS7:	
	rSDICARG=RCA<<16;	// CMD7(RCA,stuff bit)
	rSDICCON= (0x1<<9)|(0x1<<8)|0x47;   // sht_resp, wait_resp, start, CMD7

	//-- Check end of CMD7
	if(!Chk_CMDend(7, 1))
	    goto RECMDS7;
	rSDICSTA=0xa00;	// Clear cmd_end(with rsp)

	//--State(transfer) check
	if( rSDIRSP0 & 0x1e00!=0x800 )
	    goto RECMDS7;
    }
    else
    {
RECMDD7:	
	rSDICARG=0<<16;		//CMD7(RCA,stuff bit)
	rSDICCON=(0x1<<8)|0x47;	//no_resp, start, CMD7

	//-- Check end of CMD7
	if(!Chk_CMDend(7, 0))
	    goto RECMDD7;
	rSDICSTA=0x800;	// Clear cmd_end(no rsp)
    }
}

void __irq Rd_Int(void)
{
    U32 i,status;

    status=rSDIFSTA;
    if( (status&0x200) == 0x200 )	// Check Last interrupt?
    {
	for(i=(status & 0x7f)/4;i>0;i--)
	{
	    *Rx_buffer++=rSDIDAT;
	    rd_cnt++;
	}
	rSDIFSTA=rSDIFSTA&0x200;	//Clear Rx FIFO Last data Ready, YH 040221
    }
    else if( (status&0x80) == 0x80 )	// Check Half interrupt?
    {
        for(i=0;i<8;i++)
        {
    	    *Rx_buffer++=rSDIDAT;
	    rd_cnt++;
	}
    }

    ClearPending(BIT_SDI);
}

void __irq Wt_Int(void)
{
    ClearPending(BIT_SDI);

    rSDIDAT=*Tx_buffer++;
    wt_cnt++;

    if(wt_cnt==128*block)
    {
	rINTMSK |= BIT_SDI;
	rSDIDAT=*Tx_buffer;
	TR_end=1;
    }
}

void __irq DMA_end(void)
{
    ClearPending(BIT_DMA0);
    
    TR_end=1;
}

void Rd_Block(void)
{
    U32 mode;
    int status;

    rd_cnt=0;    
    Uart_Printf("Block read test[ Polling read ]\n");


	mode = 0 ;

	rSDIFSTA=rSDIFSTA|(1<<16);	// FIFO reset

    if(mode!=2)
	rSDIDCON=(2<<22)|(1<<19)|(1<<17)|(Wide<<16)|(1<<14)|(2<<12)|(block<<0);	//YH 040220

    rSDICARG=0x0;	// CMD17/18(addr)

RERDCMD:
    switch(mode)
    {
	case POL:
	    if(block<2)	// SINGLE_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x51;    // sht_resp, wait_resp, dat, start, CMD17
		if(!Chk_CMDend(17, 1))	//-- Check end of CMD17
		    goto RERDCMD;	    
	    }
	    else	// MULTI_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x52;    // sht_resp, wait_resp, dat, start, CMD18
		if(!Chk_CMDend(18, 1))	//-- Check end of CMD18 
		    goto RERDCMD;
	    }

	    rSDICSTA=0xa00;	// Clear cmd_end(with rsp)	    

	    while(rd_cnt<128*block)	// 512*block bytes
	    {
		if((rSDIDSTA&0x20)==0x20) // Check timeout 
		{
		    rSDIDSTA=(0x1<<0x5);  // Clear timeout flag
		    break;
		}
		status=rSDIFSTA;
		if((status&0x1000)==0x1000)	// Is Rx data?
		{
		    *Rx_buffer++=rSDIDAT;
		    rd_cnt++;
		}
	    }
	    break;
	
	case INT:
	    pISR_SDI=(unsigned)Rd_Int;
	    rINTMSK = ~(BIT_SDI);
	    
	    rSDIIMSK=5;	// Last & Rx FIFO half int.

	    if(block<2)	// SINGLE_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x51;    // sht_resp, wait_resp, dat, start, CMD17
		if(!Chk_CMDend(17, 1))	//-- Check end of CMD17
		    goto RERDCMD;	    
	    }
	    else	// MULTI_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x52;    // sht_resp, wait_resp, dat, start, CMD18
		if(!Chk_CMDend(18, 1))	//-- Check end of CMD18 
		    goto RERDCMD;
	    }
    
	    rSDICSTA=0xa00;	// Clear cmd_end(with rsp)

	    while(rd_cnt<128*block);

	    rINTMSK |= (BIT_SDI);
	    rSDIIMSK=0;	// All mask
	    break;

	case DMA:
	    pISR_DMA0=(unsigned)DMA_end;
	    rINTMSK = ~(BIT_DMA0);
		rSDIDCON=rSDIDCON|(1<<24); //YH 040227, Burst4 Enable

	    rDISRC0=(int)(SDIDAT);	// SDIDAT
	    rDISRCC0=(1<<1)+(1<<0);	// APB, fix
	    rDIDST0=(U32)(Rx_buffer);	// Rx_buffer
	    rDIDSTC0=(0<<1)+(0<<0);	// AHB, inc
	    rDCON0=(1<<31)+(0<<30)+(1<<29)+(0<<28)+(0<<27)+(2<<24)+(1<<23)+(1<<22)+(2<<20)+128*block;

	    rDMASKTRIG0=(0<<2)+(1<<1)+0;    //no-stop, DMA2 channel on, no-sw trigger 

	    rSDIDCON=(2<<22)|(1<<19)|(1<<17)|(Wide<<16)|(1<<15)|(1<<14)|(2<<12)|(block<<0);
	    if(block<2)	// SINGLE_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x51;    // sht_resp, wait_resp, dat, start, CMD17
		if(!Chk_CMDend(17, 1))	//-- Check end of CMD17
		    goto RERDCMD;	    
	    }
	    else	// MULTI_READ
	    {
		rSDICCON=(0x1<<9)|(0x1<<8)|0x52;    // sht_resp, wait_resp, dat, start, CMD18
		if(!Chk_CMDend(18, 1))	//-- Check end of CMD18 
		    goto RERDCMD;
	    }

	    rSDICSTA=0xa00;	// Clear cmd_end(with rsp)
	    while(!TR_end);
		//Uart_Printf("rSDIFSTA=0x%x\n",rSDIFSTA);
	    rINTMSK |= (BIT_DMA0);
	    TR_end=0;
	    rDMASKTRIG0=(1<<2);	//DMA0 stop
	    break;

	default:
	    break;
    }
    //-- Check end of DATA
    if(!Chk_DATend()) 
	Uart_Printf("dat error\n");

	rSDIDCON=rSDIDCON&~(7<<12);		
	rSDIFSTA=rSDIFSTA&0x200;	//Clear Rx FIFO Last data Ready, YH 040221
    rSDIDSTA=0x10;	// Clear data Tx/Rx end detect

    if(block>1)
    {
RERCMD12:    
	//--Stop cmd(CMD12)
	rSDICARG=0x0;	    //CMD12(stuff bit)
	rSDICCON=(0x1<<9)|(0x1<<8)|0x4c;//sht_resp, wait_resp, start, CMD12

	//-- Check end of CMD12
	if(!Chk_CMDend(12, 1)) 
	    goto RERCMD12;
	rSDICSTA=0xa00;	// Clear cmd_end(with rsp)
    }
}


void Rd_Stream(void)	// only for MMC, 3blk read
{
    int status, rd_cnt=0;

    if(MMC!=1)
    {
	Uart_Printf("Stream read command supports only MMC!\n");
	return;
    }    
    Uart_Printf("\n[Stream read test]\n");
    
RECMD11:
	  rSDIDCON=(2<<22)|(1<<19)|(0<<17)|(0<<16)|(1<<14)|(2<<12);


    rSDICARG=0x0;   // CMD11(addr)
    rSDICCON=(0x1<<9)|(0x1<<8)|0x4b;   //sht_resp, wait_resp, dat, start, CMD11

    while(rd_cnt<128*block)
    {
	if( (rSDIDSTA&0x20) == 0x20 )
	{
	    Uart_Printf("Rread timeout error");
	    return ;
	}
	    
	status=rSDIFSTA;
	if((status&0x1000)==0x1000)
	{
	    //*Rx_buffer++=rSDIDAT;
	    //rd_cnt++;
	    Rx_buffer[rd_cnt++]=rSDIDAT;
	}
    }

    //-- Check end of CMD11
    if(!Chk_CMDend(11, 1)) 
	goto RECMD11;
    rSDICSTA=0xa00;	// Clear cmd_end(with rsp)

    //-- Check end of DATA
    rSDIDCON=(2<<22)|(1<<19)|(0<<17)|(0<<16);	//YH 040220
    rSDIDCON=rSDIDCON&~(7<<12);		//YH 040220, no operation, data ready

    while( rSDIDSTA&0x3 !=0x0 );
    if(rSDIDSTA!=0) 
	Uart_Printf("rSDIDSTA=0x%x\n", rSDIDSTA);
    rSDIDSTA=0xff;	//YH 040221