uC/FS调试笔记

最新推荐文章于 2021-01-13 23:53:33 发布

zhuangtq

最新推荐文章于 2021-01-13 23:53:33 发布

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文章标签： buffer flash io cmd

本文详细记录了在调试uC/FSFAT16文件系统过程中遇到的问题，包括接口函数定义、初始化、读写操作、坏块处理等方面，并提供了针对性的解决方法。重点强调了heap区大小对系统稳定性的关键作用，以及如何正确地进行NAND闪存的读写操作，避免数据丢失和系统崩溃。

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最近调试了uC/FS FAT16的文件系统,发现uC/FS在网上的基本上只有1.34版本的可以用,

调试时发现几个问题,

(1)定义接口函数

const FS__device_type FS__flashdevice_driver = {
"FLASH device",
_FS_FLASH_DevStatus,
_FS_FLASH_DevRead,
_FS_FLASH_DevWrite,
_FS_FLASH_DevIoCtl
};

其实也就read , write两个有用,其它return ok就好了

(2)flash_x_hw.c

int FS__FLASH_Init(FS_u32 Unit){
return Nand_init();
}

int FS__FLASH_ReadSector(FS_u32 Unit,unsigned long Sector,unsigned char *pBuffer){
return Nand_io(Sector,(unsigned int *)pBuffer,1);
}

int FS__FLASH_WriteSector(FS_u32 Unit,unsigned long Sector,unsigned char *pBuffer){
return Nand_io(Sector,(unsigned int *)pBuffer,0);
}

(3)最重要的是,heap区应足够大,要大于16K,因为分区交换时要用

int NandReadBlock(unsigned int buffer,unsigned int block)
{
int i;
unsigned int buffer_ptr,status,page;

page = block*32;

buffer_ptr = buffer;

for(i=0; i<32; i++)
{
  status = NFReadPage(page, (unsigned char *)buffer_ptr);
  if(status != 0) return -1;
  page ++;
  buffer_ptr += 512;
}

return 0;

}

int NandWriteBlock(unsigned int* buffer,unsigned int block)
{
int i;
unsigned int buffer_ptr,status,page;

page = block*32;

buffer_ptr = (unsigned int)buffer;

for(i=0; i<32; i++)
{
  status = NFWritePage(page, (unsigned char *)buffer_ptr);
  if(status!= 0) return -1;
  page ++;
  buffer_ptr += 512;
}

return 0;

}

int NandBlockToTemp(unsigned int *buffer,unsigned int block)
{
int i;
unsigned int status,page,buffer_ptr;

page = block*32;

buffer_ptr = (unsigned int)buffer;

for(i=0;i<32;i++)
{
  status = NFReadPage(page, (unsigned char *)buffer_ptr);
  if(status!= 0) return -1;
  page++;
  buffer_ptr += 512;
}

return 0;

}

int Nand_io(unsigned int page, unsigned int *buffer, int reading)
{
unsigned int i,pageoffset,blocknum;
unsigned int *swap_block,*swap_ptr;

if(reading == 1)
  NFReadPage(page, (unsigned char *)buffer);
else if(reading == 0)
{
  swap_block = (unsigned int *)malloc(512*32);
  blocknum = page/32;
  pageoffset = page %32;
  swap_ptr = swap_block + 0x200*pageoffset/4;

  NandBlockToTemp(swap_block,blocknum);       //保存该页所在块到交换块
  memcpy(swap_ptr,buffer,512);    //写页数据到交换块相应的位置
  NFEraseBlock(page);
  for(i = 0;i < 3000; i++);
  NandWriteBlock(swap_block,blocknum);
  free(swap_block);

}
else return 1;

return 0;
}