/*對(duì)FLASH進(jìn)行讀寫的函數(shù)
* 器件:AVR AT MEAG16  373鎖存   
* FLASHROM:W49F002U  
* PA0~7,PC0~7地址和數(shù)據(jù)線
* PD5 讀始能 PD6 寫始能  PD7 ALE 
*  
*/


#define ALE_HIGH()   PORTD |=0X01;           //定義ALE管腳
#define ALE_LOW()    PORTD &=0XFE;             
#define W_EN_HIGH()  PORTD |=0B00000010;     //定義寫始能
#define W_EN_LOW()   PORTD &=0B11111101;
#define R_EN_HIGH()  PORTD |=0B00000100;     //定義讀始能
#define R_EN_LOW()   PORTD &=0B11111011;
//**************************************************************/
unsigned char FlashRead(long int data_adress);          //定義FLASH讀函數(shù)
void FlashWrite(unsigned int data_adress,unsigned char data);//定義FLASH寫函數(shù)
void ChipErase(void);      	  //片擦除
void SectoErase(char sector); //區(qū)擦除
void BootBlockLockout(void);  
void AdressSend(long int adress);
/***************************************************************/
//按BIT讀FLASHROM
unsigned char FlashRead(long int data_adress)
{
	char data;
	R_EN_LOW();                 //讀始能打開,低電平有效
	W_EN_HIGH();                //寫始能關(guān)閉
	AdressSend(data_adress);    //送地址
	DDRA =0X00;                 //
	data =PINA;                 //從A口讀數(shù)據(jù)
	R_EN_HIGH();                //讀始能關(guān)閉
	return data;                //返回?cái)?shù)據(jù)
}
//按BIT寫FLASHROM
void FlashWrite(unsigned int data_adress,unsigned char data)
{
	W_EN_LOW();                     //寫始能打開,低電平有效
	R_EN_HIGH();                 	//讀始能關(guān)閉
	AdressSend(0x5555);    			//送地址
	DDRA =0XFF;
	PORTA =0XAA;
	
	AdressSend(0x2AAA);    			//送地址
	DDRA =0XFF;
	PORTA =0X55;
	
	AdressSend(0x5555);    			//送地址
	DDRA =0XFF;
	PORTA =0XA0;
	
	AdressSend(data_adress);    	//送地址
	DDRA =0XFF;
	PORTA =data;
	W_EN_HIGH();                	//寫始能關(guān)閉
}
//片擦除
void ChipErase(void)
{
    
	W_EN_LOW();                     //寫始能打開,低電平有效
	R_EN_HIGH();                 	//讀始能關(guān)閉
	AdressSend(0x5555);    			//送地址
	DDRA =0XFF;
	PORTA =0XAA;
	
	AdressSend(0x2AAA);    			//送地址
	DDRA =0XFF;
	PORTA =0X55;
	
	AdressSend(0x5555);    			//送地址
	DDRA =0XFF;
	PORTA =0X80;
	
	AdressSend(0X5555);    			//送地址
	DDRA =0XFF;
	PORTA =0XAA;
	
	AdressSend(0X2AAA);    			//送地址
	DDRA =0XFF;
	PORTA =0X55;
	
	AdressSend(0X5555);    			//送地址
	DDRA =0XFF;
	PORTA =0X10;
	
	W_EN_HIGH();                	//寫始能關(guān)閉
}
//送地址到FLASH和373
void AdressSend(long int adress)
{
    ALE_HIGH();                		//ALE設(shè)置為高  
    DDRA =0XFF;                     //設(shè)定A口為輸出
	DDRC =0XFF;                     //設(shè)定C口為輸出
	DDRD =0XFF;                     //設(shè)定D口為輸出
	PORTA =adress&0xff;        		//送底8位地址A0~A7   PA0~7
    PORTC =(adress>>8)&0xff;   		//送中間8位地址A8~A15    PC0~7
    PORTD =(PORTD&0xE7)|((adress>>13)&0x18);   //送地址A16~A17    PD3~4
    ALE_LOW();                 				   //鎖存數(shù)據(jù)
}