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请教一下，目前用CH374U链接USBmidi后发现有丢包现象，具体情况就是钢琴琴键按下或者放手的时候，有时候获取不到这包数据，我在midi钢琴与CH374U之间放了USB分析仪，在分析仪中数据都是有发送的。附上主要读取数据的程序，这个是根据官方的CH374U_HID_UDISK这个程序包参考过来的，

/* 事物传输 */ /* SET IN OUT */ /* Timeout=0不重试 Timeout=0xffff无限重试 ,返回PID*/

UINT8 Issue_Token( UINT8 PID, UINT8 Endp, UINT8 Tog, UINT16 Timeout )

{

UINT8 s, resp, err_resp, err_num = 0;

while(1) /* 虽是死循环，但终究有返回的 */

{

Write374Byte( REG_USB_H_PID, ( PID<<4 ) | Endp );

Write374Byte( REG_USB_H_CTRL, Tog? BIT_HOST_TRAN_TOG|BIT_HOST_RECV_TOG|BIT_HOST_START:BIT_HOST_START ); /* 启动传输 */

s = Wait374Interrupt( );

if( s == Failure ) /* 设备超时无响应,最多重试三次*/

err_num++;

else err_num = 0;

if( err_num == 3 )

return s;

Write374Byte( REG_INTER_FLAG, BIT_IF_TRANSFER | BIT_IF_USB_PAUSE ); /* 清中断 ,必须清除传输暂停位*/

if( err_num == 0 )

{

s = Read374Byte( REG_USB_STATUS );

resp = s & BIT_STAT_DEV_RESP;

switch( PID ) /* 分析令牌PID */

{

case DEF_USB_PID_SETUP:

case DEF_USB_PID_OUT:

if( resp == DEF_USB_PID_ACK ) /* 返回ACK */

return resp;

else if( resp == DEF_USB_PID_NAK ) /* 根据是否超时决定返回NAK */

{

if( Timeout == 0 )

return resp;

else

{

if( Timeout < 0xffff) Timeout--;

}

else if( resp == DEF_USB_PID_STALL ) /* 返回STALL */

return resp;

else /* 出错或超时等 */

{

err_resp++;

if( err_resp == 3 )

return resp;

}

break;

case DEF_USB_PID_IN:

if( resp == DEF_USB_PID_DATA0 || resp == DEF_USB_PID_DATA1 ) /* 说明收到了数据包，但不一定同步 */

{

if( s & BIT_STAT_TOG_MATCH ) /* 翻转同步返回ACK */

return DEF_USB_PID_ACK;

else /* 翻转不同步返回当前DATA值 */

return resp;

}

else if( resp == DEF_USB_PID_NAK ) /* 根据是否超时决定返回NAK */

{

if( Timeout == 0 )

return resp;

else

{

if( Timeout < 0xffff) Timeout--;

}

else if( resp == DEF_USB_PID_STALL ) /* 返回STALL */

return resp;

else /* 出错或超时等 */

{

err_resp++;

if( err_resp == 3 )

return resp;

}

break;

default:

return Failure; /* 非法PID */

break;

}

UINT8 Get_HidData( UINT8 Edp, UINT8 Tog, UINT8 *DataBuffer, UINT8 *len )

{

UINT8 s;

/* 设置待操作Hub口 */

//SelectHub( HubIndex );

/* 发送IN包 */

*len = 0;

s = Issue_Token( DEF_USB_PID_IN, Edp, Tog, 0 ); //不重试

if( s == DEF_USB_PID_ACK )

{

*len = Read374Byte( REG_USB_LENGTH );

Read374Block( RAM_HOST_RECV, *len, DataBuffer );

if(DataBuffer[1]!=0xfe){

printf( "lend 0x%x :0x%x 0x%x 0x%x 0x%x 0x%x 0x%x \n",*len,DataBuffer[0],DataBuffer[1], DataBuffer[2],DataBuffer[3],DataBuffer[4],DataBuffer[5]);

}

else

return s;

return Success;

}

/*==============================================寄存器测试程序====================================================================================*/

/* 函数说明：主要用与测试寄存器，读出积存器的值，写入并读出寄存器的值，方便测试

入口参数：寄存器地址

出口参数：无

/*=================================================================================================================================================*/

void ReadPrintfReg( UINT8 addr)

{

UINT8 value;

value=Read374Byte(addr);

printf("ADDRESS=%02X",(UINT16)addr);

printf(" REGISTE=%02X\n",(UINT16)value);

}

/* 为printf和getkey输入输出初始化串口 */

voidmInitSTDIO( )

{

}

intmain( void ) // USB HUB

{

UINT8i, s, len;

UINT8 buf[64];

USART1_Config();//?????????

//P1&=0xF8; // ???U???????????????????

mDelaymS( 50 ); // 等待CH374复位完成

CH374_PORT_INIT( ); /* CH374接口初始化 */

mInitSTDIO( ); /* 为了让计算机通过串口监控演示过程 */

printf( "Start CH374 Host\n" );

Init374Host( ); // 初始化USB主机方式并启用HUB功能

printf( "end CH374 Host\n" );

s = Read374Byte( 0x04 );

printf( "Read374Byte 0x%x\n" ,s);

//while(1);

while ( 1 )

{

HostSetBusFree( ); // 设定USB主机空闲

printf( "Wait Device In\n" );

while ( 1 )

{

if ( Query374Interrupt( ) ) HostDetectInterrupt( ); // 如果有USB主机中断则处理

if ( ExcessNeedEnum( ) ) break; // 有USB设备

}

mDelaymS( 250 ); // 由于USB设备刚插入尚未稳定，故等待USB设备数百毫秒，消除插拔抖动

if ( Query374Interrupt( ) ) HostDetectInterrupt( ); // 如果有USB主机中断则处理

while( 1 )

{

//HostSetBusReset( );//起用HUB功能时候，不需要此函数

ResetEndpBus( EndPointAddr );

StartPort( EndPointAddr );

ReadPrintfReg( 0x06 );

for ( i = 0; i < 100; i ++ )

{ // 等待USB设备复位后重新连接

ReadPrintfReg( 0x02 );

if ( Query374Endport( ) ) break; // 有USB设备

mDelaymS( 1 );

}

if ( Query374Interrupt( ) ) HostDetectInterrupt( ); // 如果有USB主机中断则处理

if ( Query374Endport( ) )

{ // 有USB设备

ChangeSpeed( EndPointAddr ); //检查设备速度，不匹配切换

if( Infor_DEV[1].Speed_Flag==1 )Write374Byte( REG_HUB_CTRL,Read374Byte(REG_HUB_CTRL)|BIT_HUB1_POLAR);

mDelaymS( 10 );

}

else

{

printf( "Device gone !\n" );

if( ExcessNeedEnum ( )==FALSE )break;// 如果没有需要枚举的设备则退出

else continue; // 设备已经断开,继续等待

}

ReadPrintfReg( 0x03 );

mDelaymS( 50 );

printf( "GetDeviceDescr: " );

s = GetDeviceDescr( buf ); // 获取设备描述符

if ( s != USB_INT_SUCCESS )

{

printf( "ERROR = %02X\n", (UINT16)s ); //for(s=0;s<20;s++) ReadPrintfReg(s);

Fail_Init( EndPointAddr );

if( !(ExcessNeedEnum( )) )break; // 终止操作,等待USB设备拔出

else continue;

}

for ( i = 0; i < ( (PUSB_SETUP_REQ)SetupGetDevDescr ) -> wLengthL; i ++ ) printf( "%02X ", (UINT16)( buf[i] ) );

printf( "\n" );

printf( "SetUsbAddress: " );

printf("EndPointAddr=%02X\n",(UINT16)EndPointAddr );

s = SetUsbAddress( EndPointAddr ); // 设置USB设备地址

if ( s != USB_INT_SUCCESS )

{

Fail_Init( EndPointAddr );

printf( "ERROR = %02X\n", (UINT16)s );

if( !(ExcessNeedEnum( ) ) )break; // 终止操作,等待USB设备拔出

else continue;

}

printf( "\n" );

printf( "GetConfigDescr: " );

s = GetConfigDescr( buf ); // 获取配置描述符

if ( s != USB_INT_SUCCESS )

{

Fail_Init( EndPointAddr );

printf( "ERROR = %02X\n", (UINT16)s );

if( !(ExcessNeedEnum( )) )break; // 终止操作,等待USB设备拔出

else continue; //如果没设备则等待拔出

} //有未枚举完的设备则继续枚举

i=( (PUSB_CFG_DESCR_LONG)buf )->itf_descr.bNumEndpoints;

Put_EndpInf_List( (PUSB_CFG_DESCR_LONG)buf, i );

for ( i = 0; i < ( (PUSB_CFG_DESCR)buf ) -> wTotalLengthL; i ++ ) printf( "%02X ", (UINT16)( buf[i] ) );

printf( "\n" );

/* 分析配置描述符，获取端点数据/各端点地址/各端点大小等，更新变量endp_addr和endp_size等 */

printf( "SetUsbConfig: \n" );

s = SetUsbConfig( ( (PUSB_CFG_DESCR)buf ) -> bConfigurationValue ); // 设置USB设备配置

if ( s != USB_INT_SUCCESS )

{

Fail_Init( EndPointAddr );

printf( "ERROR = %02X\n", (UINT16)s );

if( !(ExcessNeedEnum( )) )break; // 终止操作,等待USB设备拔出

else continue;

}

else Infor_DEV[EndPointAddr].Already_Conf=1;

/* do something, read/write ...

len = out_endp_size;

Write374Block( RAM_HOST_TRAN, len, buf );

Write374Byte( REG_USB_LENGTH, len );

s = WaitHostTransact374( out_endp_addr, DEF_USB_PID_OUT, FALSE, 1000 );

s = WaitHostTransact374( in_endp_addr, DEF_USB_PID_IN, FALSE, 1000 );

len = Read374Byte( REG_USB_LENGTH );

Read374Block( RAM_HOST_RECV, len, buf );

len = out_endp_size;

Write374Block( RAM_HOST_TRAN, len, buf );

Write374Byte( REG_USB_LENGTH, len );

s = WaitHostTransact374( out_endp_addr, DEF_USB_PID_OUT, TRUE, 1000 );

s = WaitHostTransact374( in_endp_addr, DEF_USB_PID_IN, TRUE, 1000 );

len = Read374Byte( REG_USB_LENGTH );

Read374Block( RAM_HOST_RECV, len, buf );

printf( "do something, read / write ......\n" );

if( Infor_DEV[EndPointAddr].Speed_Flag==1 )HostSetFullSpeed( ); // 如果是低速设备，则将总线速度切换到全速

printf("***********************\n");

printf( "SUCESS ENUMERATE\n" ); //还需要枚举的设备数量

printf("***********************\n");

s=ExcessNeedEnum( ); //在枚举完毕最后一个设备时再次检测有无设备

if( s==FALSE )

{printf("No device need Setconfig\n");

break; //没有设备需要枚举，则退出函数

}

WaitDeviceOut: // ??USB????

printf( "Wait Device Out\n" );

while ( 1 ) {

if ( Query374Interrupt( ) ) HostDetectInterrupt( ); // ???USB???????

if ( Query374DeviceIn( ) == FALSE ) break; // ??USB??

s = Get_HidData( 0x02, 1, buf, &len ); //获取HID数据

#if 0

s = WaitHostTransact374( 0x02, DEF_USB_PID_IN, FALSE, 1000 );

//printf( "s ......0x%x\n", s );

len = Read374Byte( REG_USB_LENGTH );

if(len>0){

//printf( "len ......%d\n", len );

Read374Block( RAM_HOST_RECV, len, buf );

//for(i=0;i

//printf( "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x \n",buf[0],buf[1], buf[2],buf[3],buf[4],buf[5]);

//printf( "buf[%d]=0x%x\n", i, buf[i] );

//}

if(buf[1]!=0xfe)

printf( "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x \n",buf[0],buf[1], buf[2],buf[3],buf[4],buf[5]);

}

#endif

}

mDelaymS( 100 ); // ????????,??????

if ( Query374DeviceIn( ) ) goto WaitDeviceOut; // ??????

//HostSetBusFree( ); // ??USB????,???????SOF

}

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