//頭文件
/////////////////////////////
#include "c8051F320.h"
#include "stdio.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
//位定義
sbit FLASH_WP	=P2^0;	//命令鎖存
sbit FLASH_WE	=P2^1;	//地址鎖存
sbit FLASH_ALE	=P2^2;	//寫保護
sbit FLASH_CLE  =P2^3;	//片選
sbit FLASH_CE   =P2^4;	//寫使能
sbit FLASH_RE   =P2^5;	//讀使能
sbit FLASH_RB   =P2^6;	//忙指示
sbit FLASH_SE   =P2^7;

//P1口為數據口
//注釋掉的函數在需要時可以取掉注釋即可
///////////////////////////////////////////////////////////////////////////////////////////////////
//FLASH函數聲明
void 			Flash_Init(void);								//FLASH初始化
//unsigned int 	Get_Flash_ID(void);								//讀FLASH的ID號
//unsigned char 	Get_Flash_Status(void);						//讀FLASH的狀態
unsigned char 	Flash_Erase_Block(unsigned int BlockNum);		//擦除FLASH中的第BlockNum個BLOCK,擦除成功則返回1
void 			Flash_Read_Page(unsigned int BLockNum,unsigned char BlockPageNum,unsigned char *P,unsigned int Data_Length);
				//讀出第BlockNum個BLOCK中第BlockPageNum個PAGE中的內容，長度為Data_Length
unsigned char 	Flash_Write_Page(unsigned int BLockNum,unsigned char BlockPageNum,unsigned char *P,unsigned int Data_Length);
				//意義同上
void 			Flash_Write_Command(unsigned char command);		//寫命令
void 			Flash_Write_Address(unsigned char address);		//寫地址
void 			Flash_Write_Data(unsigned char num);			//寫一字節數據
unsigned char 	Flash_Read_Data(void);							//讀一字節數據

//void Test_Flash(void);			//FLASH測試函數，首先讀取FLASH的ID號，然后寫入512字節數據，再讀出來，判斷是否正確

extern	void	Time_Delay(unsigned int time);
////////////////////////////////////////////////////////////////////////////////////////////////////


void Flash_Init()
{
	unsigned int i=0;
	P1=0xff;
	P2MDOUT=0xff;
	FLASH_SE=0;FLASH_WP=1;FLASH_CE=0;FLASH_ALE=0;
	FLASH_CLE=0;FLASH_WE=1;FLASH_RE=1;FLASH_RB=1;	//控制位的初始狀態
	Flash_Write_Command(0xff);						//復位命令
	Time_Delay(50);									//延時50ms
}
/*
unsigned int Get_Flash_ID(void)
{
	unsigned int id=0;
	Flash_Write_Command(0x90);		//讀ID命令
	Flash_Write_Address(0x00);		//地址
	id=Flash_Read_Data();		    //讀ID的高8位
	id *=256;
	id+=Flash_Read_Data();			//讀ID的低8位
	return(id);
}
*/
/*
unsigned char Get_Flash_Status()
{
	unsigned char status=0;
	Flash_Write_Command(0x70);
	status=Flash_Read_Data();
	return(status);
}*/

unsigned char Flash_Erase_Block(unsigned int BlockNum)
{
	unsigned char Address_M=0,Address_H=0;
	unsigned int  PageNum=0;
	unsigned char status=0;
	PageNum=BlockNum*32;				//計算PAGE地址（這是該BLOCK中的第一個PAGE），每個BLOCK含32個PAGE
	Address_M=PageNum & 0xff;
	Address_H=(PageNum>>8) & 0xff;		//擦除BLOCK時，只需要輸入地址的高兩字節，此處為計算地址的高兩字節
	Flash_Write_Command(0x60);			//發送擦除命令
	Flash_Write_Address(Address_M);
	Flash_Write_Address(Address_H);		//發送地址
	Flash_Write_Command(0xd0);			//啟動擦除
	P2MDOUT =0xbf;
	FLASH_RB=1;							//FLASH_RB漏極開路輸出
	while(!FLASH_RB)					//判斷是否擦除完畢
	{}

	Flash_Write_Command(0x70);			//發送讀狀態命令
	status=Flash_Read_Data();			//讀狀態
	if(status & 0x01)					//如果有錯誤，則返回false
	{
		return(0);
	}
	else								//否則返回true
	{
		return(1);
	}
}

void Flash_Read_Page(unsigned int BLockNum,unsigned char BlockPageNum,unsigned char *P,unsigned int Data_Length)
{
	unsigned int  i=0;
	unsigned int  PageNum=0;
	unsigned char Address_L=0,Address_M=0,Address_H=0;
	PageNum=BLockNum*32+BlockPageNum;		//計算該PAGE在整個FLASH中的PAGE地址
	Address_L=0;
	Address_M=PageNum & 0xff;
	Address_H=(PageNum>>8) & 0xff;
	Flash_Write_Command(0x00);				//將內部指針指向A區
	Flash_Write_Address(Address_L);		    //寫地址
	Flash_Write_Address(Address_M);
	Flash_Write_Address(Address_H);
	for(i=0;i<Data_Length;i++)
	{
		*(P+i)=Flash_Read_Data();			//讀數據
	}

}

unsigned char Flash_Write_Page(unsigned int BLockNum,unsigned char BlockPageNum,unsigned char *P,unsigned int Data_Length)
{
	unsigned int  i=0;
	unsigned int  PageNum=0;
	unsigned char Address_L=0,Address_M=0,Address_H=0;
	unsigned char status=0;
	PageNum=BLockNum*32+BlockPageNum;		//計算該PAGE在整個FLASH中的PAGE地址
	Address_L=0;
	Address_M=PageNum & 0xff;
	Address_H=(PageNum>>8) & 0xff;
	
	Flash_Write_Command(0x00);			//將內部指針指向A區
	Flash_Write_Command(0x80);			//寫FLASH命令
	Flash_Write_Address(Address_L);		//寫地址
	Flash_Write_Address(Address_M);
	Flash_Write_Address(Address_H);
	for(i=0;i<Data_Length;i++)
	{
		Flash_Write_Data(*(P+i));		//將數據寫入緩沖區
	}
	Flash_Write_Command(0x10);		  	//啟動寫入，將數據從緩沖區寫入到FLASH
	P2MDOUT =0xbf;						//FLASH_RB漏極開路輸出
	FLASH_RB=1;
	while(!FLASH_RB)					//判斷是否操作完畢
	{}

	Flash_Write_Command(0x70);			//發送讀狀態命令
	status=Flash_Read_Data();			//讀狀態
	if(status & 0x01)					//如果有錯誤，則返回false
	{
		return(0);
	}
	else								//否則返回true
	{
		return(1);
	}

}

void Flash_Write_Command(unsigned char command)
{
	FLASH_ALE=0;	//地址鎖存禁止
	FLASH_CLE=1;	//命令鎖存使能
	FLASH_WE =0;	//寫使能信號，上升沿有效
	P1MDOUT  =0xff;	//設置P1為推挽輸出
	P1=command;
	FLASH_WE =1;	//命令在上升沿寫入
	FLASH_CLE=0;	//命令鎖存禁止
	FLASH_ALE=1;
}

void Flash_Write_Address(unsigned char address)
{
	FLASH_WE=1;
	FLASH_CLE=0;	//命令鎖存禁止
	FLASH_ALE=1;	//地址鎖存使能
	FLASH_WE =0;	//寫使能信號，上升沿有效
	P1MDOUT  =0xff;	//設置P1為推挽輸出
	P1=address;
	FLASH_WE =1;	//上升沿寫入
	FLASH_ALE=0;	//地址鎖存禁止
}

void Flash_Write_Data(unsigned char num)
{
	FLASH_WE=1;
	FLASH_CLE=0;	//命令鎖存禁止
	FLASH_ALE=0;	//地址鎖存禁止
	FLASH_WE =0;	//寫使能信號, 上升沿有效
	P1MDOUT  =0xff;	//設置P1為推挽輸出
	P1=num;
	FLASH_WE =1;	//命令在上升沿寫入
}

unsigned char Flash_Read_Data(void)
{
	unsigned char num=0;
	FLASH_CLE	=0;		//命令鎖存禁止
	FLASH_ALE	=0;		//地址鎖存禁止
	P1MDOUT    =0x00;	//設置P1為漏極開路輸出
	P1		 	=0xff;
	FLASH_RE 	=0;		//讀信號使能
	P2MDOUT =0xbf;		//FLASH_RB漏極開路輸出
	FLASH_RB=1;
	while(!FLASH_RB)	//判斷是否操作完畢
	{}
	num=P1;
	FLASH_RE=1;
	return(num);
}
/*
void Test_Flash()
{
	unsigned int Flash_ID;
	xdata unsigned char Buffer[512];
	unsigned int i=0,dat=0;
	Flash_ID=Get_Flash_ID();
	printf("Flash_ID is %u\n",Flash_ID);

	for(i=0;i<512;i++)
	{Buffer[i]=i;}
	for(i=0;i<256;i++)
	{Buffer[256+i]=i;}
	Flash_Write_Page(1,1,Buffer,512);
	for(i=0;i<512;i++)
	{Buffer[i]=0;}
	Flash_Read_Page(1,1,Buffer,512);
	for(i=0;i<512;i++)
	{
		dat=Buffer[i];
		printf("the No.%u data is %u\n",i,dat);
	}

}*/