flash.c

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#include <hidef.h>      /* common defines and macros */
#include <mc9s12dg128.h>     /* derivative information */

#define uchar unsigned char
#define uint  unsigned int
#define ulong unsigned long

#define cs1_s PTS|=0x80     //set cs
#define cs1_c PTS&=~0x80    //clr cs


volatile uchar buf[528];		//sent or read buff
volatile uint bufc;		    	//buffer sent or read couter
volatile uchar comm[10];		//commom buffer
volatile uchar comc;			  //commom couter
volatile uchar ty;				  //op type: 0: no,  1:read,  2: write


void ini_at45(void)		//inilazation
{
 uchar temp;
 bufc=0;
 comc=0;
 PTS=0x80;
 DDRS=0x80;
 SPI0BR=0x01;       //波特率为8MHz
 temp=SPI0SR;
 SPI0CR1=0xdc;      //SPI enable, interrupt enable, master, mode 3
 SPI0CR2=0x00;
 cs1_s;
}
                      //
 
void sad(uint page)
{
 uchar tmp;
 tmp=(page>>7)&0x1f;		//get the high 5 bits address
 comm[2]=tmp;
 tmp=(page<<1)&0x00fe;		//get the low 7 bits address drop
 comm[1]=tmp;
 comm[0]=0x00;
 comc=3;
 ty=0;
 cs1_c;						//start
}


void sent(uchar bs)		//write the buf into AT45DB041,  bs: buffer select
{
 uchar i;
 for(i=0;i<5;i++)
   comm[i]=0;		//3 don't care bytes
 comc=3;
 ty=2;
 bufc=(bs==2?520:256);
 cs1_c;				//chip sellect
 i=SPI0SR;    
 SPI0DR=(bs==2?0x87:0x84);		//if bs=2, then to buffer2 else to buffer1
}

void load(uchar bs, uint page)		//load the buffer data to flash bs: buffer chose page: page address
{
 uchar tmp;
 sad(page);						//set address
 tmp=SPI0SR;
 SPI0DR=(bs==2?0x86:0x83);		//if bs=2, then to buffer2  else to buffer1
}								//

void out(uchar bs,uint page) 		//data out to buffer, bs: buffer sellect, page page adress
{
 uchar tmp;
 sad(page);					//set address
 tmp=SPI0SR;
 SPI0DR=(bs==2?0x55:0x53);			//if bs=2, the load to buffer2 else load to buffer1
}

void get(uchar bs)		//get data from AT buffer1 or buffer2, bs: buffer select
{
 uchar i;
 for(i=0;i<10;i++)
   comm[i]=0;
 comc=5;			//3 bytes AD, 1 byte don't care bytes, 1 byte start byte
 ty=1;
 bufc=(bs==2?520:256);
 cs1_c;
 i=SPI0SR;
 SPI0DR=(bs==2?0x56:0x54);
}                //*/


interrupt 19 void spi0(void)			//spi interrupt
{
 uchar tmp;
 uchar tda;
 
 tmp=SPI0SR;
 tda=SPI0DR;
 
 if(comc==0) 				//comomo fininsh
  {
   if(ty==2)		//writing condition
     {
	  if(bufc==0||bufc==264)			//finish
	   {
	    ty=0;
	  	cs1_s;
	   }
	  else
	   {
	    bufc--;
	   	SPI0DR=buf[bufc];
	   }
	 }
   else if(ty==1)  //reading condition
    {
	 if(bufc==0||bufc==264)			//finish
	   {
	    ty=0;
	  	cs1_s;	   
	   }
	 else
	    {
		   bufc--;
    	 buf[bufc]=tda;
	  	 SPI0DR=0x00;		 
	  	}
   }
  else		//no data bytes needed
    cs1_s;
  }
 else		//sending comom
    {
	   comc--;
	   SPI0DR=comm[comc];
	}
}           


void d_out(uint ds)   //将第ds,ds+1 block的数据发送到串口
{
  uint j;
  uchar tmp;
  out(1,ds);
  delay(10);
  get(1);
  delay(10);
  out(2,ds+1);
  delay(10);
  get(2);
  for(j=0;j<256;j++)   //保存的数据发到串口
    {
     tmp=SCI0SR1;       //数据发到串口
     SCI0DRL=buf[j];
     delay(1);       
    }
  PORTB^=0x0f;
  for(j=264;j<(264+256);j++)
   {
     tmp=SCI0SR1;       //数据发到串口
     SCI0DRL=buf[j];
     delay(1);       
   }
  PORTB^=0x0f;
}