f020spi.c

80C51F020的SPI接口源码

        SendSPIByte(0x00);
		DF_CHIP_NOSELECT;
}

//写缓存＋缓存写主存
void FlashProgViaBuffer1(unsigned int start_addr, unsigned int len,unsigned char *buffer) //将指定数据通过缓存1写入Flash指定位置(不擦除)
{
   		unsigned int  i;
		DF_RDY_BUSY; 		// check if flash is busy
   		DF_CHIP_SELECT;					//缓冲区1为82H  缓冲区2为85H
		SendSPIByte(PAGE_PROG_THROUGH_B1);
        SendSPIByte((unsigned char)(AT450XXPageAddr >> 7));
        SendSPIByte((unsigned char)(AT450XXPageAddr << 1 + start_addr>>8));
   		SendSPIByte((unsigned char)start_addr);
   		for (i=0;i<len;i++)
   			SendSPIByte(buffer[i]);
		DF_CHIP_NOSELECT;
}
//写缓存＋缓存写主存
void FlashProgViaBuffer2(unsigned int start_addr, unsigned int len,unsigned char *buffer) //将指定数据通过缓存2写入Flash指定位置(不擦除)
{
   		unsigned int  i;
		DF_RDY_BUSY; 		// check if flash is busy
   		DF_CHIP_SELECT;					//缓冲区1为82H  缓冲区2为85H
		SendSPIByte(PAGE_PROG_THROUGH_B2);
        SendSPIByte((unsigned char)(AT450XXPageAddr >> 7));
        SendSPIByte((unsigned char)(AT450XXPageAddr << 1 + start_addr>>8));
   		SendSPIByte((unsigned char)start_addr);
   		for (i=0;i<len;i++)
   			SendSPIByte(buffer[i]);
		DF_CHIP_NOSELECT;
}

//写缓存＋擦除＋缓存写主存
void FlashAutoProgViaBuffer1(unsigned int start_addr, unsigned int len,unsigned char *buffer) //将指定数据通过缓存1写入Flash指定位置(先擦除)
{
   		unsigned int  i;
		DF_RDY_BUSY; 		// check if flash is busy
   		DF_CHIP_SELECT;					//缓冲区1为84H  缓冲区2为87H
		SendSPIByte(AUTO_PAGE_REWRITE_THROUGH_B1);
        SendSPIByte((unsigned char)(AT450XXPageAddr >> 7));
        SendSPIByte((unsigned char)(AT450XXPageAddr << 1 + start_addr>>8));
   		SendSPIByte((unsigned char)start_addr);
   		for (i=0;i<len;i++)
   			SendSPIByte(buffer[i]);
		DF_CHIP_NOSELECT;
}

//写缓存＋擦除＋缓存写主存
void FlashAutoProgViaBuffer2(unsigned int start_addr, unsigned int len,unsigned char *buffer) //将指定数据通过缓存2写入Flash指定位置(先擦除)
{
   		unsigned int  i;
		DF_RDY_BUSY; 		// check if flash is busy
   		DF_CHIP_SELECT;					//缓冲区1为84H  缓冲区2为87H
		SendSPIByte(AUTO_PAGE_REWRITE_THROUGH_B2);
        SendSPIByte((unsigned char)(AT450XXPageAddr >> 7));
        SendSPIByte((unsigned char)(AT450XXPageAddr << 1 + start_addr>>8));
   		SendSPIByte((unsigned char)start_addr);
   		for (i=0;i<len;i++)
   			SendSPIByte(buffer[i]);
		DF_CHIP_NOSELECT;
}
sfr16 DP       = 0x82;                 // data pointer
sfr16 TMR3RL   = 0x92;                 // Timer3 reload value
sfr16 TMR3     = 0x94;                 // Timer3 counter
sfr16 ADC0     = 0xbe;                 // ADC0 data
sfr16 ADC0GT   = 0xc4;                 // ADC0 greater than window
sfr16 ADC0LT   = 0xc6;                 // ADC0 less than window
sfr16 RCAP2    = 0xca;                 // Timer2 capture/reload
sfr16 T2       = 0xcc;                 // Timer2
sfr16 DAC0     = 0xd2;                 // DAC0 data
sfr16 DAC1     = 0xd5;                 // DAC1 data
unsigned int Count1msInc;
void SYSCLK_Init (void);
void PORT_Init (void);
void SPI0_Init (void);
void Timer0_Init (void);
void main (void) {
unsigned char xdata MyBuff[1000];
unsigned char xdata MyBuff1[1000];
unsigned int i,j;
	WDTCN = 0xde;                       // disable watchdog timer
	WDTCN = 0xad;
	SYSCLK_Init ();                     // initialize oscillator
	Timer0_Init();
	PORT_Init ();                       // initialize crossbar and GPIO
	EA=1;
	DF_RESET;
	SPI0_Init ();                       // initialize SPI0
	RAM_CHIP_SELECT_BANK0;
    EMI0CF = 0x2F; 
   	i=1;
   	if (i)
	{ 
		Count1msInc=0;
		ErasingDataFlash();			//整片擦除
		Count1msInc=0;
      for (i=0;i<2;i++)
		{	
			AT450XXPageAddr=i;
			for (j=0;j<255;j++)
			{
				MyBuff[j]=j+i;
			}
			if (i%2)
				FlashAutoProgViaBuffer1(0,264,MyBuff); //将指定数据通过缓存1写入Flash指定位置(先擦除)
			else
				FlashAutoProgViaBuffer2(0,264,MyBuff); //将指定数据通过缓存2写入Flash指定位置(先擦除)
		}
      /*  for(i=0;i<520;i++)
		{ if(i<260)
		  MyBuff[i]=0x00;
		  else 
		  MyBuff[i]=0x01;

		}*/
	    AT450XXPageAddr=0;
		FlashBuffer1Write(20,14,"1234567890UUAA");
		FlashBuffer1Read(0,260,MyBuff1);
	   	FlashBuffer1Write(20,14,"1234567890UUAA");
	   	FlashBuffer1Read(20,14,MyBuff); //在此处设置断点,观察MyBuff的内容
		FlashBuffer1ProgNoErase();
	   	PageToBuffer2();
	   	FlashBuffer2Read(20,14,MyBuff); 
	   	Count1msInc=0;
	   	FlashBuffer2Read(100,14,MyBuff);
	   	Count1msInc=0;
	   	FlashBuffer1Write(20,14,"1234567890UUAA");
	   	Count1msInc=0;
	   	FlashBuffer1Read(100,14,MyBuff);
	   	Count1msInc=0;
	   	FlashBuffer1ProgNoErase(); 
	   	Count1msInc=0;
	   	PageToBuffer2();
	   	Count1msInc=0;
	   	FlashBuffer2Read(100,14,MyBuff);
	   	FlashProgViaBuffer1(100,14,MyBuff);
		ErasingDataFlash();
		EraseFlashPage(); 
		FlashBuffer1Read(1,1, MyBuff); //从缓冲区1的指定位置(0-263)中读入指定字节
		FlashBuffer2Read(1,1,MyBuff); //从缓冲区2的指定位置(0-263)中读入指定字节
		FlashBuffer1Write(1,1,"!");
		FlashBuffer2Write(1,1,"1");
		GetFlashStatus();
		PageToBuffer1();
		PageToBuffer2();
		FlashBuffer1ProgNoErase();
		FlashBuffer2ProgNoErase();
		FlashBuffer1ProgAutoErase();
		FlashBuffer2ProgAutoErase();
		FlashProgViaBuffer1(1,1, MyBuff);
		FlashProgViaBuffer2(1,1, MyBuff);
		FlashAutoProgViaBuffer1(1,1, MyBuff);
		FlashAutoProgViaBuffer2(1,1, MyBuff);
	}
xxx:   goto xxx;
}

//系统初始化
void SYSCLK_Init (void)
{
   int i;                              // delay counter
   OSCXCN = 0x67;                      // start external oscillator with
                                       // 11.0592MHz crystal
   for (i=0; i < 256; i++) ;           // Wait for osc. to start up
   while (!(OSCXCN & 0x80)) ;          // Wait for crystal osc. to settle
   OSCICN = 0x88;                      // select external oscillator as SYSCLK
                                       // source and enable missing clock
}
//端口初始化
void PORT_Init (void)
{
   XBR0    = 0x07;                     // Enable SMBus, SPI0, and UART0
   XBR1    = 0x00;
   XBR2    = 0x44;                     // Enable crossbar and weak pull-ups
   EMI0TC  = 0x21;

   P74OUT  = 0x0F;
   P0MDOUT = 0x15;
}
//SPI初始化
void SPI0_Init (void)
{
   SPI0CFG = 0x07;                     // data sampled on 1st SCK rising edge
                                       // 8-bit data words
   SPI0CFG|=0xC0;//CKPOL =1;

   SPI0CN = 0x03;                      // Master mode; SPI enabled; flags
                                       // cleared
   SPI0CKR = SYSCLK/2/2000000-1;       // SPI clock <= 8MHz (limited by 
                                       // EEPROM spec.)
}
//定时器初始化
void Timer0_Init (void)
{
   CKCON|=0x8;
   TMOD|=0x1;    //16Bit
   TR0 = 0;                         	// STOP Timer0
   TH0 = (-SYSCLK/1000) >> 8;    		// set Timer0 to overflow in 1ms
   TL0 = -SYSCLK/1000;
   TR0 = 1;   	// START Timer0
   IE|= 0x2; 
}
//定时器中断服务程序
void Timer0_ISR (void) interrupt 1  //1ms
{
	TH0 = (-SYSCLK/1000) >> 8;  
   	TL0 = -SYSCLK/1000;
	Count1msInc++;
}