spiflash.c

ccs编译环境,C语言编程,SPI总线eeprom

#include "DSP28_Device.h"

#define SPI_SEL_REG *(Uint16 *)0x2004
#define M_SPI  0X02

unsigned int m;
unsigned int from_flash;

void WriteFlash(unsigned int flash_data1);
//void ReadFlash(unsigned int flash_data2);
void delay(unsigned int t);

void main(void)
{   unsigned int to_flash;

	unsigned int j;	
	 
	
	/*初始化系统*/
	InitSysCtrl();
	/* 关中断 */
	DINT;
	IER = 0x0000;
	IFR = 0x0000;
	/* 初始化PIE控制寄存器 */
	InitPieCtrl();
	/* 初始化PIE参数表 */
	InitPieVectTable();	
	/* 初始化外设寄存器 */
	InitPeripherals();	
	///初始化IO口
	InitGpio();	
	///初始化SPI
	SPI_SEL_REG=M_SPI;
   	InitSpi();
   	   
	/*设置CPU*/	
	EINT;   // Enable Global interrupt INTM
	ERTM;	// Enable Global realtime interrupt DBGM
//	 GpioDataRegs.GPASET.all|=0x8000;
    


	to_flash = 0x50; 		//EWSR		
	WriteFlash(to_flash);
	delay(1000);
	//写状态寄存器
	to_flash = 0x01;		//WRSR
	WriteFlash(to_flash);
	//状态寄存器数据为0
	to_flash = 0x00;
	WriteFlash(to_flash);
	delay(5000);
	
//芯片擦除
	to_flash = 0x06;	//允许写（WREN)
	WriteFlash(to_flash);
	delay(2000);			  	
	to_flash = 0x60;		//芯片擦除命令
	WriteFlash(to_flash);
	for(j=0;j<10;j++)	//120ms
	{
	delay(40000);		//10ms
	}
	
	//向FLASH写数据
	to_flash = 0x06;	//允许写（WREN)
	WriteFlash(to_flash);
	delay(1000);			 
	to_flash = 0x02;	//字节编程命令
	WriteFlash(to_flash);
	delay(100);			 
	to_flash = 0x00;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);			 
	to_flash = 0x00;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);			 
	to_flash = 0x05;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);			 
	to_flash = 12;	//数据
	WriteFlash(to_flash);
	delay(10000);	


	//从FLASH读数据
	to_flash = 0x03;	//读命令
	WriteFlash(to_flash);
	delay(100);			//2us
	to_flash = 0x00;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);	
	to_flash = 0x00;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);	
	to_flash = 0x05;	//FLASH地址
	WriteFlash(to_flash);
	delay(100);	
	to_flash = 0xff;	//延长CE
	WriteFlash(to_flash);
	delay(100);
	to_flash = 0xff;	//延长CE
	WriteFlash(to_flash);
	delay(100);
	from_flash = SpiaRegs.SPIRXBUF;
	delay(10000);
	delay(10);			//运行到这里
		
} 


void WriteFlash(unsigned int flash_data1)
{
 	unsigned short int data;
  	data = 0x0000;
	data = (flash_data1<<8);
    
  while(1)
  {
  	if(Spi_TxReady() == 1)
    {
    SpiaRegs.SPITXBUF = data; 
    delay(50);
    break;
    }
    }
 
 //   delay(10000);
    
}


void delay(unsigned int t)
{
 while(t>0)
    t--;
}
//===========================================================================
// No more.
//===========================================================================