移植FatFs到W25Q256
1. 移植diskio.c
diskio.c文件用来连接硬件存储器和ff.c文件
a. 为W25Q256设置驱动编号
/*将W25Q256设为驱动1*/
#define W25Q256 1 /*Map Flash W25Q256 to physical drive 1 */b.配置disk_status函数，获取W25Q256状态
DSTATUS disk_status (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
int result;
switch (pdrv) {
case ATA :
return stat;
/*读取W25Q256状态*/
case W25Q256 :
/*读取W25Q256设备ID，确认状态*/
if(0xEF4019 == BSP_W25Q256_ReadID())
{
/* 设备ID正确 */
stat = 0;
}
else
{
/* 设备ID错误 */
stat = STA_NOINIT;
}
result = stat;
return stat;
}
return STA_NOINIT;
}c.连接初始化函数
DSTATUS disk_initialize (
BYTE pdrv /* Physical drive nmuber to identify the drive */
)
{
DSTATUS stat;
int result;
switch (pdrv) {
case ATA :
// result = ATA_disk_initialize();
// translate the reslut code here
return stat;
case W25Q256 :
BSP_W25Q256_Init();/*初始化W25Q256*/
stat=disk_status(W25Q256);/*获取W25Q256状态*/
result = stat;
return stat;
}
return STA_NOINIT;
}d.连接读取函数
DRESULT disk_read (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
BYTE *buff, /* Data buffer to store read data */
DWORD sector, /* Sector address in LBA */
UINT count /* Number of sectors to read */
)
{
DRESULT res;
int result;
switch (pdrv) {
case ATA :
// translate the arguments here
// result = ATA_disk_read(buff, sector, count);
// translate the reslut code here
return res;
case W25Q256 :
/* 扇区偏移16MB，外部Flash文件系统空间放在Flash后面16MB空间
一共512Block*16 = 8192 Sector = 32MB
sector+=4096 表示从第4096个sector开始
第4096个sector地址：0x4096 000
第4097个sector地址：0x4097 000
相差0x1000*/
sector+=4096;
/*sector*0x1000 将第几个Sector转换为W25Q256地址
count*4096 第二个参数是Byte数量，一个Sector有4096个Byte*/
BSP_W25Q256_Read_Data(sector*0x1000,count*4096 ,buff);
res = RES_OK;
return res;
}
return RES_PARERR;
}e.连接写函数
DRESULT disk_write (
BYTE pdrv, /* Physical drive nmuber to identify the drive */
const BYTE *buff, /* Data to be written */
DWORD sector, /* Sector address in LBA */
UINT count /* Number of sectors to write */
)
{
DRESULT res;
int result;
switch (pdrv) {
case ATA :
// translate the arguments here
//result = ATA_disk_write(buff, sector, count);
// translate the reslut code here
return res;
case W25Q256 :
/* 扇区偏移16MB，外部Flash文件系统空间放在Flash后面16MB空间
一共512Block*16 = 8192 Sector = 32MB*/
sector+=4096;
BSP_W25Q256_Sector_Erase(sector*0x1000);
BSP_W25Q256_Write_General(sector*0x1000,(u8 *)buff,count*4096);
res = RES_OK;
result = res;
return res;
}
return RES_PARERR;
}f.其他命令函数
DRESULT disk_ioctl (
BYTE pdrv, /* Physical drive nmuber (0..) */
BYTE cmd, /* Control code */
void *buff /* Buffer to send/receive control data */
)
{
DRESULT res;
int result;
switch (pdrv) {
case ATA :
// Process of the command for the ATA drive
return res;
case W25Q256 :
switch (cmd) {
/* 扇区数量：4096sector*/
case GET_SECTOR_COUNT:
*(DWORD * )buff = 4096;
break;
/* 扇区大小 4096Byte */
case GET_SECTOR_SIZE :
*(WORD * )buff = 4096;
break;
/* 同时擦除扇区个数 */
case GET_BLOCK_SIZE :
*(DWORD * )buff = 1;
break;
}
res = RES_OK;
return res;
}
return RES_PARERR;
}2.配置ffconf.h 配置各种状态
#define _USE_MKFS 1 //格式化分区使能
#define _CODE_PAGE 936 //选择简体中文，加入cc936.c
#define _USE_LFN 2 //打开LFN
#define _MAX_LFN 255
#define _VOLUMES 2 //两个分卷ATA和W25Q256
#define _MIN_SS 512
#define _MAX_SS 4096 //sector大小设置3.测试FatFs
{
printf("\n******FATFS TEST******");
/*注册一个FatFs工作区域*/
f_mkfs("1:",0,0);
if(0==f_mount(&Fs_1,"1:",1))
{
printf("\nW25Q256 注册成功");
}
else
{
printf("\nW25Q256 注册失败");
printf("\n格式化文件系统");
/*格式化文件系统*/
f_mkfs("1:",0,0);
}
/*显示芯片ID*/
printf("\nW25Q256 ID：0X%X",BSP_W25Q256_ReadID());
/*新建变量保存操作状态*/
uint8_t FatFsState;
/*开始新建文件并写入数据*/
printf("\n开始新建文件并写入数据!");
/*新建文件File_1.txt,指针File_1*/
FatFsState = f_open(&File_1, "1:File_1.txt",FA_CREATE_ALWAYS | FA_WRITE );
printf("\nf_open 1:File_1.txt state:%d",FatFsState);
/*写入数据*/
FatFsState = f_write(&File_1,File_1Content,sizeof(File_1Content),&File1Num);
printf("\nf_write 1:File_1.txt state:%d",FatFsState);
/*关闭文件*/
FatFsState = f_close(&File_1);
printf("\nf_close 1:File_1.txt state:%d",FatFsState);
/*写入完成*/
printf("\n写入完成!");
printf("\nWrite File1 Number:%d",File1Num);
printf("\nWrite File1 Content:%s",File_1Content);
/*打开文件*/
printf("\n打开文件1:File_1.txt!读取内容");
FatFsState = f_open(&File_1, "1:File_1.txt",FA_OPEN_EXISTING | FA_READ );
printf("\nf_open 1:File_1.txt state:%d",FatFsState);
/*读取数据*/
FatFsState = f_read(&File_1, ReadFile_1Content, sizeof(ReadFile_1Content), &File1Num);
printf("\nf_read 1:File_1.txt state:%d",FatFsState);
/*关闭文件*/
FatFsState = f_close(&File_1);
printf("\nf_close 1:File_1.txt state:%d",FatFsState);
/**读取的数据*/
printf("\n读取完成!");
printf("\nRead File1 Number:%d",File1Num);
printf("\nRead File1 Content:%s",ReadFile_1Content);
/*计算存储空间*/
DWORD free_clust;
FATFS *pFs_1;
f_getfree("1:", &free_clust, &pFs_1);
DWORD fre_sect, tot_sect;
tot_sect = (pFs_1->n_fatent - 2) * pFs_1->csize;
fre_sect = free_clust * pFs_1->csize;
printf("\n设备总空间：%d\n可用空间： %d\n", (int)tot_sect, (int)fre_sect);
f_mount(NULL,"1:",1);
}测试结果：
