mmc.c

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#include <iom16v.h>

// MMC commands
#define MMC_GO_IDLE_STATE		0
#define MMC_SEND_OP_COND		1
#define MMC_SEND_CSD			9
#define MMC_SEND_CID			10
#define MMC_SEND_STATUS			13
#define MMC_SET_BLOCKLEN		16
#define MMC_READ_SINGLE_BLOCK		17
#define MMC_WRITE_BLOCK			24
#define MMC_PROGRAM_CSD			27
#define MMC_SET_WRITE_PROT		28
#define MMC_CLR_WRITE_PROT		29
#define MMC_SEND_WRITE_PROT		30
#define MMC_TAG_SECTOR_START		32
#define MMC_TAG_SECTOR_END		33
#define MMC_UNTAG_SECTOR		34
#define MMC_TAG_ERASE_GROUP_START 	35
#define MMC_TAG_ERARE_GROUP_END		36
#define MMC_UNTAG_ERASE_GROUP		37
#define MMC_ERASE			38
#define MMC_CRC_ON_OFF			59

#define R1_BUSY				128
#define R1_PARAMETER			 64
#define R1_ADDRESS			 32
#define R1_ERASE_SEQ			 16
#define R1_COM_CRC			  8
#define R1_ILLEGAL_COM			  4
#define R1_ERASE_RESET		  	  2
#define R1_IDLE_STATE		  	  1

#define led1_off      (PORTA|=(1<<6))
#define led1_on       (PORTA&=~(1<<6))
#define led2_off      (PORTA|=(1<<5))
#define led2_on       (PORTA&=~(1<<5))

#define disable_mmc_cs	(PORTB|=(1<<0))
#define enable_mmc_cs	(PORTB&=~(1<<0))



unsigned char  ram_data[512];



extern void LCD_write(unsigned char data,unsigned char dc); 

/***********SPI初始化******************/
void SPI_masterinit(void) 
     {
                            //不中断 允许    主模式            fck/4	 
      SPCR=0b01010000;	      //SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0

	 }
	
/***********SPI读取/写入****基础SPI传送命令******/
unsigned char SPI_tx_rx(unsigned char spi_data);
unsigned char SPI_tx_rx(unsigned char spi_data) 
     {
	 SPDR=spi_data;
	 while (!(SPSR&0x80));
	 return SPDR;
	 }
/***********MMC_sendCmd();*****基础传送命令*******/
unsigned char MMC_sendCmd(unsigned char cmd,unsigned char A31_24,unsigned char A23_16,unsigned char A15_8,unsigned char A7_0);
unsigned char MMC_sendCmd(unsigned char cmd,unsigned char A31_24,unsigned char A23_16,unsigned char A15_8,unsigned char A7_0)
     {
	 signed char temp;
	 enable_mmc_cs;

	 SPI_tx_rx(cmd|0x40);       //cmd"01xxxxxx"
	 SPI_tx_rx(A31_24);
	 SPI_tx_rx(A23_16);
	 SPI_tx_rx(A15_8);
	 SPI_tx_rx(A7_0);
	 SPI_tx_rx(0x95);          //crc for cmd0

	 SPI_tx_rx(0xff);         //one empty cycle
 
	 temp=SPI_tx_rx(0xff);    //0=busy 
//LCD_write(temp,1);  //test point
	 if ((temp-0x80)>=0)         //0b1xxxxxxx=err
	 	   {
		   temp=0xff;
		   while (SPI_tx_rx(0xff)==0);  
//		   led1_on;  //test point
		   }
	 else 
	 	  if (cmd==MMC_SEND_STATUS)    //如果是读状态命令
	 	  	  {
		  	  temp=SPI_tx_rx(0xff);       //read STATUS
		 	  while (SPI_tx_rx(0xff)==0);  
			 // led1_on;
	 	  	  }
	 	  else                            //是其他命令
	 	  	  {
		  	  while (SPI_tx_rx(0xff)==0);  
			//  led1_on;
	 	  	  }
	 return temp;		  	 	  
	 }	
/***********MMC_finish();***停止卡片******/
void MMC_finish(void)
     {
	  disable_mmc_cs;
	  SPI_tx_rx(0xff);
	 }

/***********MMC_flush();*****丢弃几个字节*******/
void MMC_flush(unsigned char flush_num);
void MMC_flush(unsigned char flush_num)
     {
	 unsigned char counter;
	 for (counter=0;counter<flush_num;counter++) SPI_tx_rx(0xff); //丢弃几个字节
	 MMC_finish();	  
	 }
			 			 	
/***********MMC_reset();***将MMC卡转到SPI模式****/
void MMC_reset(void)
     {
	  unsigned char counter,mmc_response,lcd_add;
	  for (counter=0;counter<11;counter++) SPI_tx_rx(0xff);//80个时钟开始总线

	  mmc_response=MMC_sendCmd(MMC_GO_IDLE_STATE,0,0,0,0);   //send cmd0
	  MMC_finish();
	  
	  for (counter=0;counter<80;counter++)   //失败尝试次数
	  	  {

		  mmc_response=MMC_sendCmd(MMC_SEND_OP_COND,0,0,0,0);
		  MMC_finish();

		  if (mmc_response==0)               //切换到SPI成功
		  	  {
              led2_on;
			  counter=81;                     //跳出失败尝试次数
			  }
		  else  led1_on;                     //切换到SPI失败

		  } 
	  
	 }
		
/***********MMC_check();******测试卡是否正常为0***********/
unsigned char MMC_check(void);
unsigned char MMC_check(void)
     {
	  unsigned char mmc_response;
	  mmc_response=MMC_sendCmd(MMC_SEND_STATUS,0,0,0,0);   //send cmd
	  MMC_finish();
	  LCD_write(0x55,1);                    //test point
	  LCD_write(mmc_response&0x93,1);       //test point
	  LCD_write(0x55,1);                    //test point
	  return (mmc_response&0x93);
	 }				 
	 

/***********MMC_name();**获得卡的名字*****/
void MMC_name(void)
     {
	  unsigned char counter,lcd_add,mmc_response=1;
	  mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
	  while (mmc_response)                      //读到数据为0表示正常，就跳出
	  		{
			MMC_finish();
	  		mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
			LCD_write(mmc_response,1);          //test point
			led1_on;         //test point
//			prog_flag=1;     //错误标记
			}
	  led1_off;	       //test point
	  for (counter=0;counter<26;counter++)
	  	  {
		  ram_data[counter]=SPI_tx_rx(0xff);
		  LCD_write(ram_data[counter],1);        //test point
		  }  
	  MMC_flush(8);	  
	 }			 
	 
/***********MMC_capactity();******************/
unsigned long MMC_capactity(void);
unsigned long MMC_capactity(void)
     {
	  unsigned char counter,lcd_add,mmc_response=1;
	  mmc_response=MMC_sendCmd(MMC_SEND_CSD,0,0,0,0);
	  while (mmc_response)                      //读到数据为0表示正常，就跳出
	  		{
			MMC_finish();
	  		mmc_response=MMC_sendCmd(MMC_SEND_CID,0,0,0,0);
			LCD_write(mmc_response,1);          //test point
			led1_on;        					 //test point
//			prog_flag=1;    					  //错误标记
			}
	  led1_off;	  							     //test point
	  for (counter=0;counter<26;counter++)
	  	  {
		  ram_data[counter]=SPI_tx_rx(0xff);
		  LCD_write(ram_data[counter],1);        //test point
		  }  
	  MMC_flush(8);	  
			
			
	 }