CH376讀取單個的扇區(qū)成功,但讀取多個的扇區(qū)會出錯,這是怎么為什么呢...

出錯的現(xiàn)象是怎樣的？把你的程序貼出來看看

UINT8 idata buf[64]; UINT8 xdata FileDataBuf[5120]; /* 文件緩沖區(qū),太小則速度慢 */

main( ) {

UINT8 i, count; /* i為需要讀取的扇區(qū)數(shù) */ UINT16 s, total, Size, RealCount; /* s臨時變量, total需要讀的扇區(qū)數(shù), Size需要讀的字節(jié)數(shù) */ UINT32 NewSize; /* NewSize文件大小 */

mDelaymS( 100 ); /* 延時100毫秒 */ mInitSTDIO( ); /* 為了讓計算機通過串口監(jiān)控演示過程 */ printf( "Start\n" );

s = mInitCH376Host( ); /* 初始化CH376 */ mStopIfError( s ); /* 其它電路初始化 */

while ( 1 ) { printf( "Wait Udisk/SD\n" ); while ( CH376DiskConnect( ) != USB_INT_SUCCESS ) { /* 檢查U盤是否連接,等待U盤插入,對于SD卡,可以由單片機直接查詢SD卡座的插拔狀態(tài)引腳 */ mDelaymS( 100 ); } mDelaymS( 200 ); /* 延時,可選操作,有的USB存儲器需要幾十毫秒的延時 */

/* 對于檢測到USB設(shè)備的,最多等待10*50mS */ for ( s = 0; s < 10; s ++ ) { /* 最長等待時間,10*50mS */ mDelaymS( 50 ); printf( "Ready ?\n" ); if ( CH376DiskMount( ) == USB_INT_SUCCESS ) break; /* 初始化磁盤并測試磁盤是否就緒 */ }

/* 檢查U盤或者SD卡的剩余空間 */ printf( "DiskQuery: " ); s = CH376DiskQuery( (PUINT32)buf ); /* 查詢磁盤剩余空間信息,扇區(qū)數(shù) */ mStopIfError( s ); printf( "free cap = %ld MB\n", *(PUINT32)buf / ( 1000000 / DEF_SECTOR_SIZE ) ); /* 計算剩余空間信息 */

/* 如果CH376HFT.C文件已經(jīng)存在則添加數(shù)據(jù)到尾部,如果不存在則新建文件 */ printf( "Open\n" ); s = CH376FileOpen( "\\CH376HFT.C" ); /* 打開文件,該文件在根目錄下 */ if ( s == USB_INT_SUCCESS ) { /* 文件存在并且已經(jīng)被打開,移動文件指針到尾部以便添加數(shù)據(jù) */ NewSize = CH376GetFileSize( ); /* 讀取當(dāng)前文件長度,如果沒有零頭數(shù)據(jù),那么文件長度是DEF_SECTOR_SIZE的倍數(shù) */ printf( "File size = %ld\n", NewSize ); printf( "Locate tail\n" ); } else mStopIfError( s ); /* 打開文件時出錯 */ /* 扇區(qū)讀取源文件 */ while( NewSize ){ /* 扇區(qū)有字節(jié)讀出 */ printf( "NewSize = %ld \n", NewSize ); s = CH376SecLocate( 0 ); /* 移動到第一個字節(jié) */ mStopIfError( s ); /* 檢錯 */ total = ( NewSize + DEF_SECTOR_SIZE - 1 ) / DEF_SECTOR_SIZE; /* 將文件的字節(jié)數(shù)轉(zhuǎn)換為扇區(qū)數(shù)(除以DEF_SECTOR_SIZE),長度加上DEF_SECTOR_SIZE-1用于確保寫入最后的零頭數(shù)據(jù) */ printf( "Read sector = %d \n", total ); /* 準備要讀的扇區(qū)數(shù) */ while( total ) /* 如果扇區(qū)未讀完,則繼續(xù)讀扇區(qū) */ { if( total > 10 ) i = 10; /* 如果扇區(qū)數(shù)大于10,則該次要讀的扇區(qū)為10個 */ else i = total; /* 如果扇區(qū)數(shù)小于10,則該次要讀的扇區(qū)數(shù)為total */ s = CH376SecRead( FileDataBuf, i, &RealCount ); /* 從文件讀取數(shù)據(jù) */ mStopIfError( s ); /* 檢錯 */ total -= RealCount; /* 計數(shù),減去當(dāng)前實際已經(jīng)讀出的扇區(qū)數(shù) */ printf( "\n" ); printf( "total = %d \n", total ); if( FileSize > i * DEF_SECTOR_SIZE ) Size = i * DEF_SECTOR_SIZE; /* 如果剩余要讀的字節(jié)數(shù)大于4096,則輸出的字節(jié)數(shù)為4096 */ else Size = NewSize; /* 如果剩余要讀的字節(jié)數(shù)小于4096,則輸出的字節(jié)數(shù)為NewSize */ NewSize -= Size; printf( "\n" ); printf( "NewSize = %ld \n", NewSize ); for ( s=0; s!=Size; s++ ) printf( "%C", FileDataBuf[s] ); /* 顯示讀出的字符 */ } if( total <= 1 ) /* 如果要讀的扇區(qū)等于0,則文件讀到尾部 */ { printf( "\n" ); printf( "文件已經(jīng)結(jié)束\n" ); goto Close; /* 關(guān)閉文件 */ } } Close: printf( "Close\n" ); s = CH376FileClose( FALSE ); /* 關(guān)閉文件,扇區(qū)模式通常不自動更新文件長度,因為強制刷新緩沖區(qū)時已經(jīng)更新了文件長度,所以這里不需要自動更新文件長度 */ mStopIfError( s );

printf( "Take out\n" ); while ( CH376DiskConnect( ) == USB_INT_SUCCESS ) { /* 檢查U盤是否連接,等待U盤拔出 */ mDelaymS( 100 ); } mDelaymS( 200 ); } }

只讀取了前面一個扇區(qū)...后面的扇區(qū)都是FF..或者14

你的FileSize是怎么定義的，應(yīng)該是NewSize吧？按照你的流程是我可以讀到30K的文件

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我的還是這樣顯示...FF是空格...14是另一個符號...