读写函数
-----------------------------------------------------
void xWriteCH375Cmd( u16 mCmd )//1
{
UsartSendData(USART1, mCmd | 0x100);
}
void xWriteCH375Data( u16 mData ) //0
{
UsartSendData(USART1,mData &0x0ff) ;
}
u8 xReadCH375Data( void )
{
u8 rdata;
rdata=UsartReceiveData(USART1);
return rdata;
}
工作步骤。。。
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void ch375main( void)
{
u8i;
u16len,act;
mDelay100mS( );
i = CH375LibInit( ); /* 初始化CH375程序库和CH375芯片,操作成功返回0 */
mStopIfError( i );
printf( "CH375 Start\n" );
mDelay100mS( );
xWriteCH375Cmd(CMD_SET_USB_MODE);/**/
xWriteCH375Data(6);
mDelay100mS( );
mDelay100mS( );
xWriteCH375Cmd( CMD_GET_STATUS );
if(xReadCH375Data( )==CMD_RET_SUCCESS)
{
printf( "CH375 SET USB MODE host\n" );
}
while ( 1 )
{
printf( "Wait Udisk\n" );
/* 查询CH375中断并更新中断状态,等待U盘插入 */
while ( CH375DiskStatus != DISK_CONNECT ) xQueryInterrupt( );
mDelay100mS( ); /* 延时,可选操作,有的USB存储器需要几十毫秒的延时 */
mDelay100mS( );
for ( i = 0; i < 5; i ++ )
{ /* 检查U盘是否准备好,有些U盘不需要这一步,但是某些U盘必须要执行这一步才能工作 */
// 有的U盘总是返回未准备好,不过可以被忽略
mDelay100mS( );
mDelay100mS( );
printf( "Ready ?\n" );
act=CH375DiskReady();
printf( "Error: %02X\n", act );
if (act == ERR_SUCCESS ) break; // 查询磁盘是否准备好 /
}
/* 查询磁盘物理容量 */
printf( "DiskSize\n" );
i = CH375DiskSize( );
mStopIfError( i );
printf( "TotalSize = %d MB \n", (unsigned int)( mCmdParam.DiskSize.mDiskSizeSec >> 11 ) ); /// 显示为以MB为单位的容量
mDelay100mS( );
/* 如果MY_ADC.TXT文件已经存在则添加数据到尾部,如果不存在则新建文件 */
printf( "Open\n" );
mCopyCodeStringToIRAM( mCmdParam.Open.mPathName, "/MY_ADC.TXT" ); /* 文件名,该文
i = CH375FileOpen( ); /* 打开文件 */
mDelay100mS( );
if ( i == ERR_SUCCESS )
{
/* 文件存在并且已经被打开,移动文件指针到尾部以便添加数据 */
printf( "File size = %ld\n", CH375vFileSize );
printf( "Locate tail\n" );
mCmdParam.ByteLocate.mByteOffset = 0xffffffff; /* 移到文件的尾部 */
i = CH375ByteLocate( );
mStopIfError( i );
}
else if ( i == ERR_MISS_FILE )
{
/* 没有找到文件,必须新建文件 */
printf( "Create\n" );
mCopyCodeStringToIRAM( mCmdParam.Create.mPathName, "/MY_ADC.TXT" );
i = CH375FileCreate( );
mStopIfError( i );
}
else
{
mStopIfError( i ); /* 打开文件时出错 */
}
mDelay100mS( );
printf( "Write begin\n" );
i = sprintf( mCmdParam.ByteWrite.mByteBuffer, "此前文件长度= %ld 字节\xd\xa", CH375vFileSize );
mCmdParam.ByteWrite.mByteCount = i;
i = CH375ByteWrite( );
mStopIfError( i );
mDelay100mS( );
printf( "Write end\n" );
i = mCopyCodeStringToIRAM( mCmdParam.ByteWrite.mByteBuffer, "今天的ADC数据到此结束 \xd\xa" );
mCmdParam.ByteWrite.mByteCount = i;
i = CH375ByteWrite( );
mStopIfError( i );
mDelay100mS( );
printf( "Close\n" );
mCmdParam.Close.mUpdateLen = 1; /* 自动计算文件长度,以字节为单位写文件
i = CH375FileClose( ); /* 关闭文件 */
mStopIfError( i );
mDelay100mS( );
printf( "Take out\n" );
while ( CH375DiskStatus != DISK_DISCONNECT ) xQueryInterrupt( );
}
}
