flash.c

c8051F020 ADC0 用PCA完成16位的PWM 29F040 定时器的设置 外部静态存储器

#include "stddef.h"
#define FCD_reset 0xf0
#define FCD_erase_suspand 0xb0
#define FCD_erase_resume  0x30

#define FC_address5555 0x5555
#define FC_address2AAA 0x2aaa
#define size_29f040 0x80000

int xdata * xdata point_Flash_page;

void F29040_reset(void)
{
      point_Flash_page = 0x10000;
	*(point_Flash_page+0x30)=FCD_reset;
}
//--------------------------------------	  
unsigned int F29040_calc_address(long address) //给出一个地址，自动送出页面地址，且返回页内偏移地址
{
	unsigned long segment; unsigned int ret; unsigned int page;
	segment=address>>16;
	page=address<<16;								    
	point_Flash_page = page;	                  //取页面头地址 给头地址指针
	ret=address;
	ret&=0x0FFFF;								  
	return(ret);								  //获取页面内偏移
}
//--------------------------------------
unsigned char F29040_write_a_byte(unsigned long address,unsigned char byte) //向flash写入一个字节，写入之前请调用F29040_reset,返回0:成功，1失败
{
	unsigned int offset; unsigned char b1,b2;
	F29040_reset();
	offset=F29040_calc_address(FC_address5555);	
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0xa0;
	offset=F29040_calc_address(address);
	*(point_Flash_page+offset)=byte;
	do
	{
		b1=*(point_Flash_page+offset);                        //读flash数据总线
		b1&=0x80;                                             //B1000_0000
		b2=byte & 0x80;                                       //B1000_0000
		if(b1==b2) return(0);                                 //成功
		b1=*(point_Flash_page+offset);
		b1&=0x20;                                             //B0010_0000; 
	}
	while(b1==0);                                              //写字节周期完成
	b1=*(point_Flash_page+offset);                             //读flash数据总线
	b1&=0x80;                                                   // B1000_0000;
	b2=byte & 0x80;                                             //B1000_0000;
	if(b1==b2) return(0);                                      //成功  
	else  return(1);                                           //失败
}
//----------------------------------------
/*unsigned char F29040_write_64k_byte(unsigned long write_head_address,unsigned in registor[] )	  //向Flash的一页64kB写入数据
{
	unsigned int offset,i; unsigned char b1,b2;


	判断是否写入超出本页数
	unsigned int j=0;
	j = sizeof( registor ) / sizeof( registor[0] );  									   //数组元素个数
	c1=head_address<<16;
	c2=(write_head_address+j)<<16;  判断c2

	
	offset=F29040_calc_address(FC_address5555);	//    F29040_reset();
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0xa0;
	offset=F29040_calc_address(write_head_address);
	for(i=0;i<j;i++)
	{
	  *(point_Flash_page+offset+i)=registor[i];
	}
										 


}*/
//--------------------------------------
unsigned char F29040_read_a_byte(long read_address)                  //向flash读一个字节，写入之前请调用F29040_reset
{
	unsigned int offset; unsigned char ret;
	F29040_reset();
	/* offset=F29040_calc_address(FC_address5555);	
	   *(point_Flash_page+offset)=0xaa;
	   offset=F29040_calc_address(FC_address2AAA);
	   *(point_Flash_page+offset)=0x55;
	   offset=F29040_calc_address(FC_address5555);
	   *(point_Flash_page+offset)=0xF0;	 */
	offset=F29040_calc_address(read_address);
	ret=*(point_Flash_page+offset);
	return(ret);
}
//-----------------------------------------
unsigned char F29040_sector_remove (long remove_sector_address)									  //区擦除
{
	unsigned int offset; unsigned char b1,b2;
	F29040_reset();
	offset=F29040_calc_address(FC_address5555);	
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0x80;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(remove_sector_address);
	*(point_Flash_page+offset)=0x30;
	//	offset=F29040_calc_address(remove_sector_address);
	//  *(point_Flash_page+offset)=0x30;
	do
	{
		b1=*(point_Flash_page+offset);                        //读flash数据总线
		b1&=0x80;                                             //B1000_0000
		b2=0xFF & 0x80;                                       //B1000_0000
		if(b1==b2) return(0);                                 //成功
		b1=*(point_Flash_page+offset);
		b1&=0x20;                                             //B0010_0000; 
	}
	while(b1==0);                                              //写字节周期完成
	b1=*(point_Flash_page+offset);                             //读flash数据总线
	b1&=0x80;                                                   // B1000_0000;
	b2=0xFF & 0x80;                                             //B1000_0000;
	if(b1==b2) return(0);                                      //成功  
	else  return(1);                                           //失败
}
//-----------------------------------------							   //页擦除
void F29040_page_remove (long page_address)
{
    unsigned int offset; 
    F29040_reset();
	offset=F29040_calc_address(FC_address5555);	
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0x80;
	offset=F29040_calc_address(FC_address5555);
	*(point_Flash_page+offset)=0xaa;
	offset=F29040_calc_address(FC_address2AAA);
	*(point_Flash_page+offset)=0x55;
	offset=F29040_calc_address(page_address);
	*(point_Flash_page+offset)=0x10;
}