cmd_fat.c

基于s3c2440的U盘读写程序

#include "fat.h"
block_dev_desc_t *get_dev (char* ifname, int dev)
{
    if (strncmp(ifname,"usb",3)==0) 
    {
        extern block_dev_desc_t * usb_stor_get_dev(int dev);
        return(usb_stor_get_dev(dev));
    }
    return NULL;
}


/*=========================================================================
	"fatload - load binary file from a dos filesystem\n",
	"<interface> <dev[:part]>  <addr> <filename> [bytes]\n"
	"    - load binary file 'filename' from 'dev' on 'interface'\n"
	"      to address 'addr' from dos filesystem\n"
===========================================================================*/
int do_fat_fsload (const char *filename,unsigned char *buffer,unsigned long addr,unsigned long count)
{
    long size,i;
    block_dev_desc_t *dev_desc=NULL;
    int dev=0;
    int part=1;
     
    dev_desc=get_dev("usb",dev);
    if (dev_desc==NULL) 
    {
         
        //Invalid boot device **//
        return -1;
    }
    if (fat_register_device(dev_desc,part)!=0) 
    {
         
        // Unable to use %d:%d for fatload //
        return -1;
    }
    size = file_fat_read (filename, buffer, count,addr);
    if(size==-1) 
    {
         
        // Unable to read \"\" from %s :%d **//
        return -1;
    }
    #ifdef DEBUG
    //"\n%ld bytes read\n", size);
    for(i=0;i<size;i++)
    FAT_DPRINT("%c",buffer[i]);
    #endif	
    //sprintf(buf, "%lX", size);
    //setenv("filesize", buf);
     
    return (int)size;
}


/*==============================================================
	"fatls   - list files in a directory (default /)\n",
====================================================================*/
int do_fat_ls (const char *pathandfilename)
{
    int ret;
    int dev=0;
    int part=1;
    block_dev_desc_t *dev_desc=NULL;
     	
    dev_desc=get_dev("usb",dev);
	s_UartPrint("dev_desc=get_dev('usb',dev);\n");
    if (dev_desc==NULL) 
    {
         
        //** Invalid boot device **//
        return 1;
    }
    if (fat_register_device(dev_desc,part)!=0) 
    {
         
        // Unable to use //for fatls //
        return 1;
    }
	s_UartPrint("if (fat_register_device(dev_desc,part)!=0)\n");
    ret = file_fat_ls (pathandfilename);
	s_UartPrint("ret = file_fat_ls (pathandfilename);\n");
	s_UartPrint("ret=%d\n",ret);
    //if(ret!=0)	FAT_DPRINT("No Fat FS detected\n");
     	
    return (ret);
}


/*=========================================================================
	"    - print information about filesystem "
	return 0:success
	           1:fail
=============================================================================*/
int do_fat_fsinfo (void)
{
    int dev=0;
    int part=1;
    int ret;
    block_dev_desc_t *dev_desc=NULL;
     
    dev_desc=get_dev("usb",dev);
    if (dev_desc==NULL) 
    {
         
        // Invalid boot device //
        return 1;
    }
    if (fat_register_device(dev_desc,part)!=0) 
    {
         
        // Unable to use %d:%d for fatinfo //
        return 1;
    }
    ret=file_fat_detectfs ();
     
    return ret;
}