flash FATFS文件系统只能写入一次

wbb_forever · 发表于 2024-4-12 21:34:30

本帖最后由 wbb_forever 于 2024-4-12 21:46 编辑

格式化文件系统后只能写入一次文件，再次写入文件时无法写入，显示剩余空间为空，并且flash里面内容也会被清空，使用野火的例程也会出现这个情况，是什么原因呢？main函数代码如下：

static void malloc_size()
{
FATFS *pfs;
DWORD fre_clust, fre_sect, tot_sect;

res2 = f_getfree("1:", &fre_clust, &pfs);

  tot_sect = (pfs->n_fatent - 2) * pfs->csize;
  fre_sect = fre_clust * pfs->csize;

  printf("》设备总空间：%10lu KB。\n》可用空间：  %10lu KB。\n", tot_sect *4, fre_sect *4);
}

int main(void)
{
USART_Config();

res = f_mount(&FsObject,"1:",1);//调用spi初始化函数
//
// res = f_mkfs("1:",0,0);
// res = f_mount(&FsObject,"1:",1);
printf("f_mount_res = %d\n",res);

if(res == FR_NO_FILESYSTEM)
{
printf("进入格式化！\n");
res = f_mkfs("1:",0,0);
printf("f_mkfs_res = %d\n",res);
//格式化后要取消挂载再重新挂载文件系统
res = f_mount(NULL,"1:",1);
res = f_mount(&FsObject,"1:",1);
printf("f_mkfs_res2 = %d\n",res);
}

malloc_size();

res = f_open(&fp,"1:1bbbbbbbbbbbbbbba.txt",FA_OPEN_ALWAYS|FA_WRITE|FA_READ);

if(res == FR_OK)
{
res = f_write(&fp,write_buff,sizeof(write_buff),&w_p_num);
printf("w_p_num = %d\n",w_p_num);

f_lseek(&fp,0);
if(res == FR_OK)
{
res = f_read(&fp,read_buff,f_size(&fp),&r_p_num);
printf("r_p_num = %d\n",r_p_num);
if(res == FR_OK)
{
printf("读出内容 : %s\n",read_buff);
}
}
f_close(&fp);
}

malloc_size();

f_mount(NULL,"1:",1);

printf("文件关闭!\n");

while(1)
{};
}

屏幕截图 2024-04-12 200626.png