該主題前面的鏈接

1.開箱 ?https://bbs.elecfans.com/jishu_2172464_1_1.html

2.sd卡 播放 https://bbs.elecfans.com/jishu_2173612_1_1.html

3.音量記憶、播放暫停功能實現 https://bbs.elecfans.com/jishu_2183725_1_1.html

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此貼主要實現sd 卡根目錄wav 文件搜索 ，并實現相應的播放

1. 首先要通過字符串來識別是否是wav文件

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//通過后綴名識別文件類型
uint8_t tell_type(char *p)
{
    int i=0;
    char *attr;
    while(i<200)
    {
        if(*p=='\0')
            break;
        i++;
        p++;
    }
    if(i==200)
        return 1;
    i=0;
    while(i<5)
    {
        if(*p=='.')
        {
            p++;
            attr=p;
            break;
        }
        i++;
        p--;
    }
    if(i==5)
        return 2;

    if((strcmp(attr,"WAV")==0)||(strcmp(attr,"wav")==0))
    {
        return 0;
    }
    else
        {
            return 4;
        }
}

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2.掃描所有根目錄文件，并記錄wav個數及相應的index

uint16_t wavGetNum(uint8_t*path)
{
    DIR tdir;
    uint16_t rval =0;
    uint8_t* fn;
   // DWORD tmp;
    DWORD fileindex=0;
    uint8_t res = f_opendir(&tdir, (const TCHAR*)path);
    tfileinfo.fsize = 255;
    if(res ==FR_OK){
        //LOG_I("open root dir sucess");
        while(1){
            fileindex++;
           // tmp = tdir.dptr;
           // LOG_I("dir_ofset %d",tmp);
            res = f_readdir(&tdir, &tfileinfo);
            if(res!=FR_OK||tfileinfo.fname[0]==0){
                //LOG_I("found the end");
                break;
                }
            res =tell_type(tfileinfo.fname);
            if(res==0){
               // LOG_I("get the wav");
                wavIndex[rval] = fileindex-1;//get the index
                rval++;
            }
        }//endwhile
    }
    else{
        LOG_I("open root dir fail");
    }
    return rval;
}

3.在sd 卡mount 處進行 wav文件掃描，并獲取相應的wav名稱

uint8_t* getFilePath(uint32_t index,uint8_t* path)
{
    DIR filedir;
    uint8_t *filepath =NULL;
    tfileinfo.fsize = 255;
    uint8_t res = f_opendir(&filedir, path);
    if(res == FR_OK){
       // LOG_I("dir_ofset %d",index);
        f_seekdir(&filedir, index);
       // LOG_I("dir_ofset %d",filedir.dptr);
        res =f_readdir(&filedir, &tfileinfo);
        if(res== FR_OK){
            //LOG_I("get the file %s",tfileinfo.fname);
            filepath = &wavFileName[0];
            strcpy(filepath,&tfileinfo.fname[0]);
        }
        else {
            LOG_I("open file name error");
        }
    }
    else{
        LOG_I("open root dir fail");
    }
    return filepath;
}

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實際運行log

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