fatfs 测试文件

╰半夏微凉° 2022-12-27 14:21 142阅读 0赞

#include "led.h"
    #include "delay.h"
    #include "key.h"
    #include "sys.h"
    #include "lcd.h"
    #include "usart.h"
    #include "sram.h"
    #include "malloc.h"
    #include "string.h"
    #include "mmc_sd.h"
    #include "ff.h"
    #include "exfuns.h"
    #include "usmart.h"
    #include "fatfs_test.h"
    #include "stdlib.h"
    
    FIL fil1,fil2;
    FRESULT  fr;
    const char wr_buf[] = "ABCDEFG";
    UINT bw1;  //写指针的索引值
    UINT br1;  //写指针的索引值
    char rd_buf[20] = {0};
    
    
    
    /*
    读写测试
    功能：将写进去的值，读出来。
    */
    //Open/Create a file
    int Fatfs_RD(void)
    {
        BYTE i = 0;
    
    	fr = f_open(&fil1, "0:file1.txt", FA_CREATE_ALWAYS | FA_READ | FA_WRITE);
        if(fr) return fr;
    	
        fr = f_write(&fil1, wr_buf, sizeof(wr_buf), &bw1); 
    	if(fr) return fr;
        /*
    	fptr：File read/write pointer。进行的f_write已经将fptr变为bw1,此刻再进行f_read，读不到数据。
    	所以，将fptr改为0，从头读取文件的数据。
        或者也可以，重新以读方式打开此文件，重新定义一个fil.两种方式都可以
        
    	*/
    #if 1
        //方法1
        f_close(&fil1); //将缓存fil1的信息保存到SD卡的文件中，相当于save. 如果不f_close.则"ABCDEFG"则还没有存到SD卡中，只是在缓存中。
    	fr = f_open(&fil2, "0:file1.txt", FA_READ);
    	fr = f_read(&fil2, rd_buf, bw1, &br1); 
    	if(fr) return fr;
        f_close(&fil2);
    #else
        //方法2
        fil1.fptr = 0;
        fr = f_read(&fil1, rd_buf, bw1, &br1); 
    	if(fr) return fr;
    	f_close(&fil1);
    	f_close(&fil2);
    #endif
       
        for(i=0;i<bw1;i++)
    	{
    		printf("%c",rd_buf[i]);
    	}
    }
    
    //file2.txt "A: What can I do for you ? B: I want to buy a skirt for my daughter. "
    FIL fil3;
    FRESULT res;
    const char lseek_buf[] = "\nA:How old is your daughter ? \n";
    char lseek_buf2[10] = {0};
    UINT lseek_bw;
    UINT lseek_br;
    DWORD clmt [500];                    // 集群链接映射表缓冲区
    //f_size : 文件大小
    //f_tell : 文件当前读写指针
    int fatfs_lseek(void) //偏移文件读写指针的功能。
    {
    	
        res = f_open(&fil3, "0:file2.txt", FA_READ | FA_WRITE);
        if(res)  return res;
        
    	
    	f_lseek(&fil3, 20);  //读指针从文件头开始偏移了20.
    
        res = f_read(&fil3, lseek_buf2, sizeof(lseek_buf2), &lseek_br);
    	if(res)  return res;
    
        printf("%s", lseek_buf2);
    
        res = f_lseek(&fil3, f_size(&fil3));
    	if(res) return res;
    
        //res = f_write(&fil3, lseek_buf, sizeof(lseek_buf), &lseek_bw);
    	//if(res) return res;
    
    	f_lseek(&fil3, f_tell(&fil3)-50);  //当前读指针，往前偏移了
    
        res = f_read(&fil3, lseek_buf2, sizeof(lseek_buf2), &lseek_br);
    	if(res)  return res;
    	printf("%s", lseek_buf2);
    
        f_lseek(&fil3, f_tell(&fil3));     //当前读指针
        res = f_read(&fil3, lseek_buf2, sizeof(lseek_buf2), &lseek_br);
    	if(res)  return res;
    	printf("%s", lseek_buf2);
    
    	f_lseek(&fil3, f_tell(&fil3)+5);  //当前读指针，往后偏移了
    
        res = f_read(&fil3, lseek_buf2, sizeof(lseek_buf2), &lseek_br);
    	if(res)  return res;
    	printf("%s", lseek_buf2);
    
    
    //快速查找
    	f_lseek(&fil3, f_tell(&fil3)-50);  //这是正常查找
        fil3.cltbl = clmt;
    	clmt[0] = 500;
    	res = f_lseek(&fil3, CREATE_LINKMAP); //创建CLMT
    	if(res)  return res;
    	f_lseek(&fil3, f_tell(&fil3)-20);  //启动快速查找
        f_close(&fil3);
    
    }
    
    DIR dir1;
    FILINFO fno1;
    char path[256] = {0};
    UINT i =0;
    FRESULT scan_files (char* path)
    {
    	res = f_opendir(&dir1, path);
    	
    	if(FR_OK == res)
    	{
    		for(;;)
    		{
    			res = f_readdir(&dir1, &fno1);    //读目录
    			if(FR_OK != res || 0 == fno1.fname[0]) break; ///* Break on error or end of dir */
    			if(fno1.fattrib & AM_DIR) //属性为目录
    			{
    				i = strlen(path);
                    if('.' != fno1.fname[0]) //. .. AA2 
    				{
    					sprintf(&path[i], "/%s", fno1.fname); 
    					res = scan_files(path);
    					if(FR_OK != res) break;
    					path[i] = 0;
    				}
    			}
    			else
    			{
    				printf("%s %s\n",path, fno1.fname); //0:/AA1/AA2/AA3 df.txt
    			}
    		}
    		//f_closedir(&dir1);
    	}
    	return res;
    }
    
    int dir_test(void)
    {
    	strcpy(path, "0:/MUSIC");
    	res = scan_files(path);
    
    	return res;	
    }
    
    
    DIR dir2;
    FILINFO fno2;
    //在某个目录下，查找相同类型的文件
    int find_test(void)
    {
    	res = f_findfirst(&dir2, &fno2, "0:/MUSIC", "A*.mp3");
    	while(FR_OK == res && 0 != fno2.fname[0])
    	{
    		printf("%s\n",fno2.fname);
    		fr = f_findnext(&dir2, &fno2);
    	}
    }