📄 flash.c
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flashstate = AT91F_DataFlashWaitReady(DataFlash.pDataFlashDesc, AT91C_DATAFLASH_TIMEOUT);
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
if(start_addr > 0 || len < 512)
{
flashstate = AT91F_DataFlashSendCommand(&DataFlash,0x53, 4, block_number * 528);//追写
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
flashstate = AT91F_DataFlashWaitReady(DataFlash.pDataFlashDesc, AT91C_DATAFLASH_TIMEOUT);
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
flashstate = AT91F_DataFlashPagePgmBuf(&DataFlash, buf, block_number * 528 + start_addr, len);
}
else
{
flashstate = AT91F_DataFlashPagePgmBuf(&DataFlash, buf, block_number * DataFlash.pDevice->pages_size, DataFlash.pDevice->pages_size);
}
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
flashstate = AT91F_DataFlashWaitReady(DataFlash.pDataFlashDesc, AT91C_DATAFLASH_TIMEOUT);
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
//发一个命令,校验一下写进去的东西是否正确
flashstate = AT91F_DataFlashSendCommand (&DataFlash, 0x60, 4, block_number * DataFlash.pDevice->pages_size);
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
flashstate = AT91F_DataFlashWaitReady(DataFlash.pDataFlashDesc, AT91C_DATAFLASH_TIMEOUT);
if(DataFlash.pDataFlashDesc->DataFlash_state & 0x40)
{
return 0;
}
return flashstate;
}
/*****************************************************/
//建立文件系统
//刚开始时认为每个扁区都是好的.
//将文件索引表中的每一项都指向每一个扁区(第i项指向第i个扁区)
//参数: file_index_startblock 表示文件系统的所在位置的起始扁区
//返回值如果为DATAFLASH_OK(0x1)就认为是成功
//否则返回DATAFLASH_BUSY(0x0) 或 DATAFLASH_ERROR(0x2)
/****************************************************/
unsigned int mk_fs_flash( )
{
unsigned int i,j;
unsigned short block_cs = 0;
unsigned short file_index[264];
unsigned short file_index2[264];
unsigned short file_index_startblock;
AT91S_DataFlashStatus flashstate;
file_index_startblock = 8128;
for(i = 0; i < 32; i++)
{
block_cs = 0;
for(j = 0; j < 256; j++)
{
file_index[j] = i* 256 + j;
file_index2[j] = file_index[j];
block_cs +=file_index[j];
}
file_index[FLASH_CS_POS] = block_cs;//cs校验
file_index2[FLASH_CS_POS] = block_cs;//cs校验
//写主文件索引表
flashstate = write_flash_block((unsigned char *)file_index, (file_index_startblock + i));
if(DATAFLASH_OK != flashstate)//RETURN VALUE EITHER DATAFLASH_ERROR OR DATAFLASH_OK
{
return flashstate;
}
//写从文件索引表
flashstate = write_flash_block((unsigned char *)file_index2, (file_index_startblock + i + 32));
if(DATAFLASH_OK != flashstate)//RETURN VALUE EITHER DATAFLASH_ERROR OR DATAFLASH_OK
{
return flashstate;
}
}
return (DATAFLASH_OK);
}
/*****************************************************/
//检验建立的文件系统是否是正确的
//返回值如果不为DATAFLASH_OK就认为是错的
/****************************************************/
unsigned int check_mk_fs( )
{
unsigned int i,j;
unsigned short block_cs = 0;
unsigned short file_index[264];
unsigned char flash_readbuf[528];
unsigned short *pread;
unsigned short file_index_startblock;
AT91S_DataFlashStatus flashstate;
file_index_startblock = 8128;
for(i = 0; i < 32; i++)
{
block_cs = 0;
for(j = 0; j < 256; j++)
{
file_index[j] = i* 256 + j;
block_cs +=file_index[j];
}
file_index[FLASH_CS_POS] = block_cs;//cs校验
//检验主文件索引表
flashstate = read_flash_block(flash_readbuf, (file_index_startblock + i));//Added by ChengDong Lu at 04/19/2006
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
pread = (unsigned short *)flash_readbuf;
for(j = 0; j < 257; j++)
{
if(pread[j] != file_index[j])
{
return (0);
}
}
//检验从文件索引表
flashstate = read_flash_block(flash_readbuf, (file_index_startblock + i + 32));//Added by ChengDong Lu at 04/19/2006
if(DATAFLASH_OK != flashstate)
{
return flashstate;
}
pread = (unsigned short *)flash_readbuf;
for(j = 0; j < 257; j++)
{
if(pread[j] != file_index[j])
{
return (0);
}
}
}
return (DATAFLASH_OK);
}
/*******************************************************/
//功能:
// 读文件索引表中指定的扃区
// block_number是从文件索引表的第一个扁区(8128)开始计数
// 先从主文件索引表读出当前的扇区
// 如果读出成功(能正常的读出来,并且算出的cs和它原来的cs相等),则返回 1
// 否则续继读从文件索引表相应的扃区
// 如果读出成功(能正常的读出来,并且算出的cs和它原来的cs相等),则返回 1
// 否则返回0
/*******************************************************/
unsigned int read_fs_index(unsigned char *fs_buf,unsigned int block_number)
{
unsigned short i, j;
unsigned short block_cs = 0;
unsigned short *pread;
unsigned short file_index_startblock;
AT91S_DataFlashStatus flashstate;
file_index_startblock = 8128;
for(i = 0; i < 2; i++)
{
flashstate = read_flash_block(fs_buf, (file_index_startblock + block_number + i*32));
if(DATAFLASH_OK != flashstate)
{
continue;
}
pread = (unsigned short *)fs_buf;
block_cs = 0;
for(j = 0; j < 256; j++)
{
block_cs += pread[j];
}
if( pread[FLASH_CS_POS] == block_cs) //成功
{
return (1);
}
}
return (0);
}
/***************************************************************************/
//功能:
// 写文件索引表中的扁区
// block_number是从文件索引表的第一个扁区(8128)开始计数
// 先写主文件索引表相应的扃区
// 再从文件索引表相应的扃区
// 如果有一个以上能写成功则返回 1
// 否则返回0
/***************************************************************************/
unsigned int write_fs_index(unsigned char *fs_buf,unsigned int block_number)
{
unsigned short i,j;
unsigned short file_index_startblock;
unsigned short write_fs_flag = 0;
unsigned short *pread;
unsigned short block_cs = 0;
unsigned short slater_buf[264];
AT91S_DataFlashStatus flashstate;
file_index_startblock = 8128;
pread = (unsigned short *)fs_buf;
for(j = 0; j < 256; j++)
{
block_cs += pread[j];
slater_buf[j] = fs_buf[j];
}
slater_buf[FLASH_CS_POS] = block_cs;
fs_buf[FLASH_CS_POS] = block_cs;
for(i = 0; i < 2; i++)
{
if(i == 0)
{
flashstate = write_flash_block(fs_buf, (file_index_startblock + block_number + i*32));
if(DATAFLASH_OK != flashstate)
{
write_fs_flag++;
continue;
}
}
else
{
flashstate = write_flash_block((unsigned char *)slater_buf, (file_index_startblock + block_number + i*32));
if(DATAFLASH_OK != flashstate)
{
write_fs_flag++;
continue;
}
}
}
if(write_fs_flag > 0)
{
return (0);
}
else
{
return (1);
}
}
/*************************************************************************************************/
// flash的分配
//
//编程日志 第 0 - 9 扇区(10)
//报警日志 第 10 - 19 扇区(10)
//操作日志 第 20 - 29 扇区(10)
//任务 第 30 - 7069 扇区(64 *110 = 7040)
//其它数据 第 7070 - 7679 扇区
//备份区 第 7680 - 8126 扇区(要是以上的扇区坏了就从这个备份区中找一个好的扇区映射过去)
//文件索引区 第 8128 - 8191 扇区(只要文件索引区中有一个扇区是坏的就认为这个flash不可用)
//功能:
// 从备份区(7680 - 7679)中找出一块好的未用的扁区
// 它对应于文件索引表中的第30块扁区所有的数据项(0 - 255)
// 和第31块扁区中的第0 - 191项(192 - 255 这64项对应于文件表所占用的扁区)
//返回值:
// 如果能找到则将这个扁区置为已用,返回这个块扁区的编号
// 否则返回0
//
// 文件索引项描述符
// --------------------------------------------------
// | 15 | 14 | 13 - 0 |
// |----------|-------------|-----------------------|
// | 0 | 0 | 对应扁区的编号 |
// |----------|-------------|-----------------------|
//
//
//备份区对应的文件索引项描述符
// --------------------------------------------------
// | 15 | 14 | 13 - 0 |
// |----------|-------------|-----------------------|
// |使用标志 | 好坏标志 | 对应扁区的编号 |
// |----------|-------------|-----------------------|
// | 0:未用 |0 : 好 | |
// | 1:已用 |1 : 坏 | |
// --------------------------------------------------
/*************************************************************************************************/
unsigned int find_empty_block(void)
{
unsigned short fs_buf[264];
unsigned short find_number;
unsigned short i,j;
unsigned int find_result;
for(i = 0; i < 2; i++)
{
find_result = read_fs_index((unsigned char*)fs_buf, 30 + i);
if(i == 0)
{
find_number = 256;
}
else
{
find_number = 192;
}
if(find_result == 1)
{
for(j = 0; j < find_number; j++)
{
if((fs_buf[j] & 0xc000) == 0)
{
fs_buf[j] = fs_buf[j] | 0x1000;
find_result = write_fs_index((unsigned char *)fs_buf,30 + i);
if(find_result == 1)
{
return (fs_buf[j]);
}
else
{
return (0);
}
}
}
}
}
return (0);
}
/*******************************************************************************/
//功能: 读flash
//成功返回 1 ,否则返回0
/*******************************************************************************/
int flash_read(void *buf, int len, unsigned int BaseAddr)
{
unsigned int fs_block;
unsigned int read_block; //当前要读的扁区
unsigned int start_addr; //要读的数据所在扇区的起始地址
unsigned int state;
unsigned int fs_index;
unsigned char * write_pos;
unsigned char read_temp[528];
unsigned short fs_temp[264];
if((BaseAddr + len) >= (7680 * 512))
{
return (0);
}
fs_block = (BaseAddr / 512) /256; //要读的扁区的索引项在文件索引表中的扇区号
fs_index = (BaseAddr / 512) % 256; //要读的扇区的索引项在文件索引表中的扇区号的对应的位置
start_addr = BaseAddr % 512; //要读的数据所在扇区的位置
state = read_fs_index((unsigned char *)fs_temp, fs_block);//Closed by ChengDong Lu at 04/20/2006
// state = read_fs_index((unsigned char *)fs_temp, fs_block - 8128);
if(state != 1)
{
return (0);
}
write_pos = (unsigned char*)buf;//Added by ChengDong Lu at 04/19/2006
while(len > 0)
{
if(fs_index >=256)
{
fs_block++;
state = read_fs_index((unsigned char *)fs_temp, fs_block);//Closed by ChengDong Lu at 04/20/2006
// state = read_fs_index((unsigned char *)fs_temp, fs_block - 8128);
if(state != 1)
{
return (0);
}
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