host.c

CH374EVT.ZIP

		Write374Byte( REG_INTER_FLAG, BIT_IF_USB_PAUSE | BIT_IF_TRANSFER | BIT_IF_USB_SUSPEND | BIT_IF_WAKE_UP );  // 清中断标志
	}
}

void	SetHostUsbAddr( UINT8 addr )  // 设置USB主机当前操作的USB设备地址
{
	Write374Byte( REG_USB_ADDR, addr );
}

void	HostSetBusFree( void )  // USB总线空闲
{
//	Write374Byte( REG_USB_SETUP, M_SET_USB_BUS_FREE( Read374Byte( REG_USB_SETUP ) ) );  // USB总线空闲
	Write374Byte( REG_USB_SETUP, BIT_SETP_HOST_MODE );  // USB总线复位
	Write374Byte( REG_USB_SETUP, BIT_SETP_HOST_MODE | BIT_SETP_AUTO_SOF );  // USB总线复位,允许SOF
}

void	HostSetBusReset( void )  // USB总线复位
{
	UsbDevEndpSize = DEFAULT_ENDP0_SIZE;  /* USB设备的端点0的最大包尺寸 */
	SetHostUsbAddr( 0x00 );
	Write374Byte( REG_USB_H_CTRL, 0x00 );
//	Write374Byte( REG_USB_SETUP, M_SET_USB_BUS_RESET( Read374Byte( REG_USB_SETUP ) & ~ BIT_SETP_AUTO_SOF ) );  // USB总线复位
	Write374Byte( REG_USB_SETUP, M_SET_USB_BUS_RESET( BIT_SETP_HOST_MODE ) );  // USB总线复位
	mDelaymS( 20 );  // USB总线复位期间
//	Write374Byte( REG_USB_SETUP, M_SET_USB_BUS_FREE( Read374Byte( REG_USB_SETUP ) ) );  // USB总线空闲
	HostSetBusFree( );  // USB总线空闲
	mDelaymS( 1 );
	Write374Byte( REG_INTER_FLAG, BIT_IF_USB_PAUSE | BIT_IF_DEV_DETECT | BIT_IF_USB_SUSPEND );  // 清中断标志
}

void	HostSetFullSpeed( void )  // 设定全速USB设备运行环境
{
	Write374Byte( REG_USB_SETUP, Read374Byte( REG_USB_SETUP ) & ~ BIT_SETP_USB_SPEED | BIT_SETP_AUTO_SOF );  // 全速且发SOF
	mDelaymS( 1 );
}

void	HostSetLowSpeed( void )  // 设定低速USB设备运行环境
{
	Write374Byte( REG_USB_SETUP, Read374Byte( REG_USB_SETUP ) | BIT_SETP_USB_SPEED | BIT_SETP_AUTO_SOF );  // 低速且发SOF
	mDelaymS( 1 );
}

void	Init374Host( void )  // 初始化USB主机
{
	Write374Byte( REG_USB_SETUP, 0x00 );
	SetHostUsbAddr( 0x00 );
	Write374Byte( REG_USB_H_CTRL, 0x00 );
	Write374Byte( REG_INTER_FLAG, BIT_IF_USB_PAUSE | BIT_IF_INTER_FLAG );  // 清所有中断标志
//	Write374Byte( REG_INTER_EN, BIT_IE_TRANSFER );  // 允许传输完成中断,因为本程序使用查询方式检测USB设备插拔,所以无需USB设备检测中断
	Write374Byte( REG_INTER_EN, BIT_IE_TRANSFER | BIT_IE_DEV_DETECT );  // 允许传输完成中断和USB设备检测中断
	Write374Byte( REG_SYS_CTRL, BIT_CTRL_OE_POLAR );  // 对于CH374T或者UEN引脚悬空的CH374S必须置BIT_CTRL_OE_POLAR为1
	HostSetBusFree( );  // USB总线空闲
}

UINT8	GetDeviceDescr( PUINT8 buf )  // 获取设备描述符
{
	UINT8	s, len;
	s = HostCtrlTransfer374( SetupGetDevDescr, buf, &len );  // 执行控制传输
	if ( s == USB_INT_SUCCESS ) {
		UsbDevEndpSize = ( (PUSB_DEV_DESCR)buf ) -> bMaxPacketSize0;  // 端点0最大包长度,这是简化处理,正常应该先获取前8字节后立即更新UsbDevEndpSize再继续
		if ( len < ( (PUSB_SETUP_REQ)SetupGetDevDescr ) -> wLengthL ) s = USB_INT_BUF_OVER;  // 描述符长度错误
	}
	return( s );
}

UINT8	GetConfigDescr( PUINT8 buf )  // 获取配置描述符
{
	UINT8	s, len;
	UINT8	BufLogDescr[ sizeof( SetupGetCfgDescr ) ] ;
	s = HostCtrlTransfer374( SetupGetCfgDescr, buf, &len );  // 执行控制传输
	if ( s == USB_INT_SUCCESS ) {
		if ( len < ( (PUSB_SETUP_REQ)SetupGetCfgDescr ) -> wLengthL ) s = USB_INT_BUF_OVER;  // 返回长度错误
		else {
			memcpy ( BufLogDescr, SetupGetCfgDescr, sizeof( SetupGetCfgDescr ) );
			( (PUSB_SETUP_REQ)BufLogDescr ) -> wLengthL = ( (PUSB_CFG_DESCR)buf ) -> wTotalLengthL;  // 完整配置描述符的总长度
			s = HostCtrlTransfer374( BufLogDescr, buf, &len );  // 执行控制传输
			if ( s == USB_INT_SUCCESS ) {
				if ( len < ( (PUSB_CFG_DESCR)buf ) -> wTotalLengthL ) s = USB_INT_BUF_OVER;  // 描述符长度错误
			}
		}
	}
	return( s );
}

UINT8	SetUsbAddress( UINT8 addr )  // 设置USB设备地址
{
	UINT8	s;
	UINT8	BufSetAddr[ sizeof( SetupSetUsbAddr ) ] ;
	memcpy ( BufSetAddr, SetupSetUsbAddr, sizeof( SetupSetUsbAddr ) );
	( (PUSB_SETUP_REQ)BufSetAddr ) -> wValueL = addr;  // USB设备地址
	s = HostCtrlTransfer374( BufSetAddr, NULL, NULL );  // 执行控制传输
	if ( s == USB_INT_SUCCESS ) {
		SetHostUsbAddr( addr );  // 设置USB主机当前操作的USB设备地址
	}
	mDelaymS( 3 );  // 等待USB设备完成操作
	return( s );
}

UINT8	SetUsbConfig( UINT8 cfg )  // 设置USB设备配置
{
	UINT8	BufSetCfg[ sizeof( SetupSetUsbConfig ) ] ;
	memcpy ( BufSetCfg, SetupSetUsbConfig, sizeof( SetupSetUsbConfig ) );
	( (PUSB_SETUP_REQ)BufSetCfg ) -> wValueL = cfg;  // USB设备配置
	return( HostCtrlTransfer374( BufSetCfg, NULL, NULL ) );  // 执行控制传输
}

/* 为printf和getkey输入输出初始化串口 */
void	mInitSTDIO( )
{
	SCON = 0x50;
	PCON = 0x80;
	TL2 = RCAP2L = 0 - 13; /* 24MHz晶振, 57600bps */
	TH2 = RCAP2H = 0xFF;
	T2CON = 0x34;  /* 定时器2用于串口的波特率发生器 */
	TI = 1;
}

int	main( void )  // USB host
{
	UINT8	i, s;
	UINT8 idata	buf[64];
//	P1&=0xF8; // 如果在U盘文件读写模块上试用本程序必须加上本行
	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
	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 ( Query374DeviceIn( ) ) 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

		printf( "Reset Device\n" );
		HostSetBusReset( );  // USB总线复位
		for ( i = 0; i < 100; i ++ ) {  // 等待USB设备复位后重新连接
			if ( Query374DeviceIn( ) ) break;  // 有USB设备
			mDelaymS( 1 );
		}
		if ( Query374Interrupt( ) ) HostDetectInterrupt( );  // 如果有USB主机中断则处理
		if ( Query374DeviceIn( ) ) {  // 有USB设备
			if ( Query374DevFullSpeed( ) ) {
				printf( "Start Full-Speed Device\n" );
				HostSetFullSpeed( );  // 检测到全速USB设备
			}
			else {
				printf( "Start Low-Speed Device\n" );
				HostSetLowSpeed( );  // 检测到低速USB设备
			}
		}
		else {
			printf( "Device gone !\n" );
			continue;  // 设备已经断开,继续等待
		}
		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 );
			goto WaitDeviceOut;  // 终止操作,等待USB设备拔出
		}
		for ( i = 0; i < ( (PUSB_SETUP_REQ)SetupGetDevDescr ) -> wLengthL; i ++ ) printf( "%02X ", (UINT16)( buf[i] ) );
		printf( "\n" );

		printf( "SetUsbAddress: " );
		s = SetUsbAddress( 0x02 );  // 设置USB设备地址
		if ( s != USB_INT_SUCCESS ) {
			printf( "ERROR = %02X\n", (UINT16)s );
			goto WaitDeviceOut;  // 终止操作,等待USB设备拔出
		}
		printf( "\n" );

		printf( "GetConfigDescr: " );
		s = GetConfigDescr( buf );  // 获取配置描述符
		if ( s != USB_INT_SUCCESS ) {
			printf( "ERROR = %02X\n", (UINT16)s );
			goto WaitDeviceOut;  // 终止操作,等待USB设备拔出
		}
		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: " );
		s = SetUsbConfig( ( (PUSB_CFG_DESCR)buf ) -> bConfigurationValue );  // 设置USB设备配置
		if ( s != USB_INT_SUCCESS ) {
			printf( "ERROR = %02X\n", (UINT16)s );
			goto WaitDeviceOut;  // 终止操作,等待USB设备拔出
		}
		printf( "\n" );

		printf( "USB device ready now\n" );
/* 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" );

WaitDeviceOut:  // 等待USB设备拔出
		printf( "Wait Device Out\n" );
		while ( 1 ) {
			if ( Query374Interrupt( ) ) HostDetectInterrupt( );  // 如果有USB主机中断则处理
			if ( Query374DeviceIn( ) == FALSE ) break;  // 没有USB设备
		}
		mDelaymS( 100 );  // 等待设备完全断开，消除插拔抖动
		if ( Query374DeviceIn( ) ) goto WaitDeviceOut;  // 没有完全断开
//		HostSetBusFree( );  // 设定USB主机空闲，主要目的是关闭SOF
	}
}