程序從a.txt中讀取一串?dāng)?shù)據(jù)，假如是 Hello，the world！將讀的數(shù)據(jù)存放到DATA_BUF中，再將DATA_BUF中的數(shù)據(jù)寫入創(chuàng)建的文件NEWFILE.txt中，在電腦上打開此文件，看到的卻是亂碼。我始終弄不明白這是為什么，請(qǐng)各位各位哥哥姐姐們幫幫忙?。?/p>

我的程序如下： #include #include #include #include

#define MAX_PATH_LEN 32 #include "CH375HM.H"

/* 電路連接方式 單片機(jī) 模塊 P0 = D0-D7 RD = RD# WR = WR# P26 = CS# P20 = A0 P15 = STA# INT0 = INT# */ #define CH375HM_INDEX XBYTE[0xBCF0]/* CH375模塊的索引端口的I/O地址 */ #define CH375HM_DATA XBYTE[0xBDF1]/* CH375模塊的數(shù)據(jù)端口的I/O地址 */ #define CH375HM_INT_WIRE INT0 /* CH375模塊的INT#引腳連接到單片機(jī)的INT0引腳 */ sbit P15 = P1^5; #define CH375HM_STA P15 /* CH375模塊的STA#引腳連接到單片機(jī)的P15引腳 */

/* 文件數(shù)據(jù)緩沖區(qū): ExtRAM: 0000H-7FFFH */ unsigned char xdata DATA_BUF[ 512 * 64 ] _at_ 0x0000;

CMD_PARAM mCmdParam; unsigned char mIntStatus; /* CH375模塊的中斷狀態(tài)或者操作完成狀態(tài) */

sbit LED_OUT0 = P1^0; sbit LED_OUT1 = P1^1;

sbit KEY = P1^3;

#define CH375HM_INDEX_WR( Index ) { CH375HM_INDEX = (Index); } /* 寫索引地址 */ #define CH375HM_DATA_WR( Data ) { CH375HM_DATA = (Data); } /* 寫數(shù)據(jù) */ #define CH375HM_DATA_RD( ) ( CH375HM_DATA ) /* 讀數(shù)據(jù) */

void mDelaymS( unsigned char delay ) { unsigned char i, j, c; for ( i = delay; i != 0; i -- ) { for ( j = 200; j != 0; j -- ) c += 3; for ( j = 200; j != 0; j -- ) c += 3; } }

void mPressKey() { while ( 1 == KEY ) { LED_OUT0 = 0; LED_OUT1 = 1; mDelaymS(500); LED_OUT0 = 1; LED_OUT1 = 0; mDelaymS(500); } mDelaymS(200); KEY = 1; mDelaymS(200); LED_OUT0 = 0; mDelaymS(200); LED_OUT1 = 1; }

/* 執(zhí)行命令 */ unsigned char ExecCommandBuf( unsigned char cmd, unsigned char len, unsigned ar xdata *bufstart ) { unsigned char i, status; #define DataCount status unsigned char data *buf; unsigned char xdata *CurrentBuf; CH375HM_INDEX_WR( 0 ); /* 索引地址置0 */ CH375HM_DATA_WR( cmd ); /* 向索引地址0寫入命令碼 */ CH375HM_DATA_WR( len ); /* 向索引地址1寫入后續(xù)參數(shù)的長(zhǎng)度 */ if ( len ) /* 有參數(shù) */ { i = len; buf = (unsigned char *)&mCmdParam; /* 指向輸入?yún)?shù)的起始地址 */ do { CH375HM_DATA_WR( *buf ); /* 從索引地址2開始,寫入?yún)?shù) */ buf ++; } while ( -- i ); } CH375HM_STA = 0; /* 產(chǎn)生下降沿通知模塊,說明命令包已經(jīng)寫入,請(qǐng)求開始執(zhí)行命令 */ CurrentBuf = bufstart; while ( 1 ) /* 處理數(shù)據(jù)傳輸,直到操作完成才退出 */ { while ( CH375HM_INT_WIRE ); CH375HM_INDEX_WR( 63 ); status = CH375HM_DATA_RD( ); CH375HM_STA = 1; /* 中斷應(yīng)答,取消來自模塊的中斷請(qǐng)求 */ if ( status == ERR_SUCCESS ) /* 操作成功 */ { CH375HM_INDEX_WR( 1 ); DataCount = CH375HM_DATA_RD( ); /* 從索引地址1讀取返回結(jié)果數(shù)據(jù)的長(zhǎng)度,計(jì)數(shù) */ if ( DataCount ) /* 有結(jié)果數(shù)據(jù) */ { buf = (unsigned char *)&mCmdParam; /* 指向輸出參數(shù)的起始地址 */ i = 2; do { CH375HM_INDEX_WR( i ); i ++; *buf = CH375HM_DATA_RD( ); /* 從索引地址2開始,讀取結(jié)果 */ buf ++; } while ( -- DataCount ); } break; /* 操作成功返回 */ } else if ( status == USB_INT_DISK_READ ) { /* 正在從U盤讀數(shù)據(jù)塊,請(qǐng)求數(shù)據(jù)讀出 */ DataCount = 64; /* 計(jì)數(shù) */ i = 0; do { CH375HM_INDEX_WR( i ); i ++; *CurrentBuf = CH375HM_DATA_RD( ); /* 從索引地址0到63依次讀出64字節(jié)的數(shù)據(jù) */ CurrentBuf ++; /* 讀取的數(shù)據(jù)保存到外部緩沖區(qū) */ } while ( -- DataCount ); CH375HM_STA = 0; /* 產(chǎn)生下降沿通知模塊繼續(xù),說明64字節(jié)數(shù)據(jù)已經(jīng)讀取完成 */ } else if ( status == USB_INT_DISK_WRITE ) /* 正在向U盤寫數(shù)據(jù)塊,請(qǐng)求數(shù)據(jù)寫入 */ { CH375HM_INDEX_WR( 0 ); i = 64; do { CH375HM_DATA_WR( *CurrentBuf ); /* 向索引地址0到63依次寫入64字節(jié)的數(shù)據(jù) */ CurrentBuf ++; /* 寫入的數(shù)據(jù)來自外部緩沖區(qū) */ } while ( -- i ); CH375HM_STA = 0; /* 產(chǎn)生下降沿通知模塊繼續(xù),說明64字節(jié)數(shù)據(jù)已經(jīng)寫入完成 */ } else if ( status == USB_INT_DISK_RETRY ) /* 讀寫數(shù)據(jù)塊失敗重試,應(yīng)該向回修改緩沖區(qū)指針 */ { CH375HM_INDEX_WR( 0 ); i = CH375HM_DATA_RD( ); CH375HM_INDEX_WR( 1 ); DataCount = CH375HM_DATA_RD( ); CurrentBuf -= ( (unsigned short)i << 8 ) + DataCount; CH375HM_STA = 0; /* 產(chǎn)生下降沿通知模塊繼續(xù),說明重試狀態(tài)碼已經(jīng)處理完成 */ } else { /* 操作失敗 */ if ( status == ERR_DISK_DISCON || status == ERR_USB_CONNECT ) mDelaymS( 100 ); /* U盤剛剛連接或者斷開,應(yīng)該延時(shí)幾十毫秒再操作 */ break; /* 操作失敗返回 */ } }

return( status ); }

/* 執(zhí)行命令 */ unsigned char ExecCommand( unsigned char cmd, unsigned char len ) { return( ExecCommandBuf( cmd, len, 0 ) ); }

void mStopIfError( unsigned char iError ) { unsigned char led; if ( iError == ERR_SUCCESS ) return; /* 操作成功 */ led=0; while ( 1 ) { LED_OUT0 = led&1; /* LED閃爍 */ mDelaymS( 1000 ); led^=1; } }

/* 為printf和getkey輸入輸出初始化串口 */ void mInitSTDIO( ) { SCON = 0x50; //串口控制寄存器串口模式為1,8位UART,允許接收 PCON = 0x00; //電源控制寄存器 SMOD1=0 波特率為振蕩器的/64 TMOD = 0x20; //定時(shí)器的模式控制位 使用定時(shí)器1定時(shí)，采用8位自載定時(shí)器， TH1 = 0xFD; TL1 = 0xFD; //11.0529MHz晶振, 9600 bps TR1 = 1; //定時(shí)器運(yùn)行 TI = 1; //發(fā)送中斷標(biāo)志位

mDelaymS(200); LED_OUT0 = 1; mDelaymS(200); LED_OUT1 = 1; mDelaymS(200); KEY = 1; mDelaymS(200); }

void main( ) { unsigned char i, c, SecCount; unsigned long OldSize; unsigned short NewSize; LED_OUT0 = 0; /* 開機(jī)后LED亮一下以示工作 */ mDelaymS( 1000 ); LED_OUT0 = 1; mInitSTDIO( );

while ( 1 ) /* 主循環(huán) */ { /* 使用查詢方式看U盤是否連接 */ while ( 1 ) { i = ExecCommand( CMD_QueryStatus, 0 ); mStopIfError( i ); if ( mCmdParam.Status.mDiskStatus >= DISK_CONNECT ) break; /* U盤已經(jīng)連接 */ mDelaymS( 1000 ); } mDelaymS( 1000 ); LED_OUT0 = 0; /* LED亮 */ while ( ExecCommand( CMD_DiskReady, 0 ) != ERR_SUCCESS ) { mDelaymS( 1000 ); /* 查詢磁盤是否準(zhǔn)備好 */ }

mPressKey(); mDelaymS(5000);

/* 讀取原文件 */ memcpy( mCmdParam.Open.mPathName, "\\A.TXT", MAX_PATH_LEN ); i = ExecCommand( CMD_FileOpen, MAX_PATH_LEN ); if ( i == ERR_MISS_DIR || i == ERR_MISS_FILE ) { for ( c = 0; c < 255; c ++ ) { /* 最多搜索前255個(gè)文件 */ memcpy( mCmdParam.Enumer.mPathName, "\\*", MAX_PATH_LEN ); /* 搜索文件名,*為通配符,適用于所有文件或者子目錄 */ for ( i = 0; i < MAX_PATH_LEN - 1; i ++ ) if ( mCmdParam.Enumer.mPathName[ i ] == 0 ) break; /* 指向搜索文件名的結(jié)束符 */ mCmdParam.Enumer.mPathName[ i ] = c; /* 將結(jié)束符替換為搜索的序號(hào),從0到255 */ i = ExecCommand( CMD_FileEnumer, i+1 ); /* 枚舉文件,如果文件名中含有通配符*,則為搜索文件而不打開,輸入?yún)?shù)的長(zhǎng)度很好計(jì)算 */ if ( i == ERR_MISS_FILE ) break; /* 再也搜索不到匹配的文件,已經(jīng)沒有匹配的文件名 */ if ( i == ERR_SUCCESS ) { /* 搜索到與通配符相匹配的文件名,文件名及其完整路徑在命令緩沖區(qū)中 */ continue; /* 繼續(xù)搜索下一個(gè)匹配的文件名,下次搜索時(shí)序號(hào)會(huì)加1 */ } else { /* 出錯(cuò) */ mStopIfError( i ); break; } } strcpy( DATA_BUF, "Note: \xd\n沒找到文件！\xd\n" ); OldSize = 0; NewSize = strlen( DATA_BUF ); SecCount = ( NewSize + 511 ) >> 9; } else { /* 找到文件或者出錯(cuò) */ mStopIfError( i ); i = ExecCommand( CMD_FileQuery, 0 ); /* 查詢當(dāng)前文件的信息,沒有輸入?yún)?shù) */ mStopIfError( i ); OldSize = mCmdParam.Modify.mFileSize; if ( OldSize > (unsigned long)(64*512) ) { SecCount = 64; NewSize = 64*512; } else { SecCount = ( OldSize + 511 ) >> 9; NewSize = (unsigned short)OldSize; } mCmdParam.Read.mSectorCount = SecCount; /* 讀取全部數(shù)據(jù) */ i = ExecCo

你寫進(jìn)去的是什么數(shù)據(jù)，16進(jìn)制的數(shù)據(jù)還是ASCII碼？文本文件在計(jì)算機(jī)上面現(xiàn)實(shí)是以ASCII碼的形式顯示的啊

我寫進(jìn)去的是ASCII碼，比如 Microcomputer quoted an electronic technology is developing rapidly, LSI articularly the creation of the miniature machine, modern scientific research is a qualitative leap, and embedded micro-controller technology is the emergence of modern industrial control along with a new technological revolution. By embedded micro-controller system, the most obvious advantage is that can be embedded into any micro or small apparatus, equipment. Embedded this term is becoming more and more popular, But many of the concepts may have a majority of people are not very clear, in this paper, We are not pursuing the concept of specific accuracy, but may have an accurate understanding. Embedded systems are different from the common computer system, a computer system, it does not separate equipment to the physical form of, It is not a uniform appearance, its components and equipment according to the main application needs embedded in the internal equipment. play an operator, handling, storage and control. From a structural point of view system, embedded system is mainly embedded processor, supporting hardware and embedded software. Which is normally embedded MCU processor or microcontroller; Hardware support including storage media.

程序上面沒什么問題,實(shí)際在你寫數(shù)據(jù)的時(shí)候,你這些數(shù)據(jù)到要以字符串的格式放到DATA_BUF里面去才可以