【RISC-V MCU CH32V103测评】三、USB HID例程运行
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我对USB研究也好一段了。研究来研究去，我觉得最适合我的就一个HID。
因为HID不用任何驱动，只要有USB口的电脑都应能识别。
从网上找到的不错的USB资料：
USB设备描述符－概述
当插入USB设备后，主机会向设备请求各种描述符来识别设备。那什么是设备描述符呢？
Descriptor即描述符，是一个完整的数据结构，可以通过C语言等编程实现，并存储在USB设备中，用于描述一个USB设备的所有属性，USB主机是通过一系列命令来要求设备发送这些信息的。
描述符的作用就是通过命令操作作来给主机传递信息，从而让主机知道设备具有什么功能、属于哪一类设备、要占用多少带宽、使用哪类传输方式及数据量的大小，只有主机确定了这些信息之后，设备才能真正开始工作。
USB有那些标准描述符？
USB有5种标准描述符：设备描述符 、配置描述符、字符描述符、接口描述符、端点描述符 。
描述符之间有一定的关系，一个设备只有一个设备描述符，而一个设备描述符可以包含多个配置描述符，而一个配置描述符可以包含多个接口描述符，一个接口使用了几个端点，就有几个端点描述符。由此我们可以看出，USB的描述符之间的关系是一层一层的，最上一层是设备描述符，下面是配置描述符，再下面是接口描述符，再下面是端点描述符。在获取描述符时，先获取设备描述符，然后再获取配置描述符，根据配置描述符中的配置集合长度，一次将配置描述符、接口描述符、端点描述符一起一次读回。其中可能还会有获取设备序列号，厂商字符串，产品字符串等。
然后，主机同单片机之间是通过中断来完成所有数据交换的。
而例程中的README则说明了例程的功能：
我用一个从网上找的工具来验证一下就行了：
这个工具如下：
Debug.rar
(46.84 KB, 下载次数: 21)
我发了1,1,2,2,3,3,4,4,5,5,6,6,7,7
返回的数都是取了返的：以上图为证。
可见程序完全正确。
简单说一下运行原理：
首先初始化USB：
void USB_DeviceInit( void )
{
R8_USB_CTRL = 0x00;
R8_UEP4_1_MOD = RB_UEP4_RX_EN|RB_UEP4_TX_EN|RB_UEP1_RX_EN|RB_UEP1_TX_EN;
R8_UEP2_3_MOD = RB_UEP2_RX_EN|RB_UEP2_TX_EN|RB_UEP3_RX_EN|RB_UEP3_TX_EN;
R8_UEP5_6_MOD = RB_UEP5_RX_EN|RB_UEP5_TX_EN|RB_UEP6_RX_EN|RB_UEP6_TX_EN;
R8_UEP7_MOD = RB_UEP7_RX_EN|RB_UEP7_TX_EN;
R16_UEP0_DMA = (UINT16)(UINT32)pEP0_RAM_Addr;
R16_UEP1_DMA = (UINT16)(UINT32)pEP1_RAM_Addr;
R16_UEP2_DMA = (UINT16)(UINT32)pEP2_RAM_Addr;
R16_UEP3_DMA = (UINT16)(UINT32)pEP3_RAM_Addr;
R16_UEP4_DMA = (UINT16)(UINT32)pEP4_RAM_Addr;
R16_UEP5_DMA = (UINT16)(UINT32)pEP5_RAM_Addr;
R16_UEP6_DMA = (UINT16)(UINT32)pEP6_RAM_Addr;
R16_UEP7_DMA = (UINT16)(UINT32)pEP7_RAM_Addr;
R8_UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP1_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP2_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP3_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP4_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP5_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP6_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP7_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_USB_INT_FG = 0xFF;
R8_USB_INT_EN = RB_UIE_SUSPEND | RB_UIE_BUS_RST | RB_UIE_TRANSFER;
R8_USB_DEV_AD = 0x00;
R8_USB_CTRL = RB_UC_DEV_PU_EN | RB_UC_INT_BUSY | RB_UC_DMA_EN;
R8_UDEV_CTRL = RB_UD_PD_DIS|RB_UD_PORT_EN;
}
然后在中断中，处理主机的命令：有三种，初始化，输出，输入
void USB_DevTransProcess( void )
{
UINT8 len, chtype;
UINT8 intflag, errflag = 0;
intflag = R8_USB_INT_FG;
if( intflag & RB_UIF_TRANSFER )
{
switch ( R8_USB_INT_ST & MASK_UIS_TOKEN)
{
case UIS_TOKEN_SETUP:
R8_UEP0_CTRL = RB_UEP_R_TOG | RB_UEP_T_TOG | UEP_R_RES_ACK | UEP_T_RES_NAK;
len = R8_USB_RX_LEN;
if ( len == sizeof( USB_SETUP_REQ ) )
{
SetupReqLen = pSetupReqPak->wLength;
SetupReqCode = pSetupReqPak->bRequest;
chtype = pSetupReqPak->bRequestType;
len = 0;
errflag = 0;
if ( ( pSetupReqPak->bRequestType & USB_REQ_TYP_MASK ) != USB_REQ_TYP_STANDARD )
{
errflag = 0xFF;
}
else
{
switch( SetupReqCode )
{
case USB_GET_DESCRIPTOR:
{
switch( ((pSetupReqPak->wValue)>>8) )
{
case USB_DESCR_TYP_DEVICE:
pDescr = MyDevDescr;
len = MyDevDescr[0];
break;
case USB_DESCR_TYP_CONFIG:
pDescr = MyCfgDescr;
len = MyCfgDescr[2];
break;
case USB_DESCR_TYP_STRING:
switch( (pSetupReqPak->wValue)&0xff )
{
case 1:
pDescr = MyManuInfo;
len = MyManuInfo[0];
break;
case 2:
pDescr = MyProdInfo;
len = MyProdInfo[0];
break;
case 0:
pDescr = MyLangDescr;
len = MyLangDescr[0];
break;
default:
errflag = 0xFF;
break;
}
break;
default :
errflag = 0xff;
break;
}
if( SetupReqLen>len ) SetupReqLen = len;
len = (SetupReqLen >= DevEP0SIZE) ? DevEP0SIZE : SetupReqLen;
memcpy( pEP0_DataBuf, pDescr, len );
pDescr += len;
}
break;
case USB_SET_ADDRESS:
SetupReqLen = (pSetupReqPak->wValue)&0xff;
break;
case USB_GET_CONFIGURATION:
pEP0_DataBuf[0] = DevConfig;
if ( SetupReqLen > 1 ) SetupReqLen = 1;
break;
case USB_SET_CONFIGURATION:
DevConfig = (pSetupReqPak->wValue)&0xff;
break;
case USB_CLEAR_FEATURE:
if ( ( pSetupReqPak->bRequestType & USB_REQ_RECIP_MASK ) == USB_REQ_RECIP_ENDP )
{
switch( (pSetupReqPak->wIndex)&0xff )
{
case 0x82:
R8_UEP2_CTRL = (R8_UEP2_CTRL & ~( RB_UEP_T_TOG|MASK_UEP_T_RES )) | UEP_T_RES_NAK;
break;
case 0x02:
R8_UEP2_CTRL = (R8_UEP2_CTRL & ~( RB_UEP_R_TOG|MASK_UEP_R_RES )) | UEP_R_RES_ACK;
break;
case 0x81:
R8_UEP1_CTRL = (R8_UEP1_CTRL & ~( RB_UEP_T_TOG|MASK_UEP_T_RES )) | UEP_T_RES_NAK;
break;
case 0x01:
R8_UEP1_CTRL = (R8_UEP1_CTRL & ~( RB_UEP_R_TOG|MASK_UEP_R_RES )) | UEP_R_RES_ACK;
break;
default:
errflag = 0xFF;
break;
}
}
else errflag = 0xFF;
break;
case USB_GET_INTERFACE:
pEP0_DataBuf[0] = 0x00;
if ( SetupReqLen > 1 ) SetupReqLen = 1;
break;
case USB_GET_STATUS:
pEP0_DataBuf[0] = 0x00;
pEP0_DataBuf[1] = 0x00;
if ( SetupReqLen > 2 ) SetupReqLen = 2;
break;
default:
errflag = 0xff;
break;
}
}
}
else errflag = 0xff;
if( errflag == 0xff)
{
R8_UEP0_CTRL = RB_UEP_R_TOG | RB_UEP_T_TOG | UEP_R_RES_STALL | UEP_T_RES_STALL;
}
else
{
if( chtype & 0x80 )
{
len = (SetupReqLen>DevEP0SIZE) ? DevEP0SIZE : SetupReqLen;
SetupReqLen -= len;
}
else len = 0;
R8_UEP0_T_LEN = len;
R8_UEP0_CTRL = RB_UEP_R_TOG | RB_UEP_T_TOG | UEP_R_RES_ACK | UEP_T_RES_ACK;
}
break;
case UIS_TOKEN_IN:
switch ( R8_USB_INT_ST & ( MASK_UIS_TOKEN | MASK_UIS_ENDP ) )
{
case UIS_TOKEN_IN:
switch( SetupReqCode )
{
case USB_GET_DESCRIPTOR:
len = SetupReqLen >= DevEP0SIZE ? DevEP0SIZE : SetupReqLen;
memcpy( pEP0_DataBuf, pDescr, len );
SetupReqLen -= len;
pDescr += len;
R8_UEP0_T_LEN = len;
R8_UEP0_CTRL ^= RB_UEP_T_TOG;
break;
case USB_SET_ADDRESS:
R8_USB_DEV_AD = (R8_USB_DEV_AD&RB_UDA_GP_BIT) | SetupReqLen;
R8_UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
break;
default:
R8_UEP0_T_LEN = 0;
R8_UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
break;
}
break;
case UIS_TOKEN_IN | 1:
R8_UEP1_CTRL ^= RB_UEP_T_TOG;
R8_UEP1_CTRL = (R8_UEP1_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 2:
R8_UEP2_CTRL ^= RB_UEP_T_TOG;
R8_UEP2_CTRL = (R8_UEP2_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 3:
R8_UEP3_CTRL ^= RB_UEP_T_TOG;
R8_UEP3_CTRL = (R8_UEP3_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 4:
R8_UEP4_CTRL ^= RB_UEP_T_TOG;
R8_UEP4_CTRL = (R8_UEP4_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 5:
R8_UEP5_CTRL ^= RB_UEP_T_TOG;
R8_UEP5_CTRL = (R8_UEP5_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 6:
R8_UEP6_CTRL ^= RB_UEP_T_TOG;
R8_UEP6_CTRL = (R8_UEP6_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
case UIS_TOKEN_IN | 7:
R8_UEP7_CTRL ^= RB_UEP_T_TOG;
R8_UEP7_CTRL = (R8_UEP7_CTRL & ~MASK_UEP_T_RES) | UEP_T_RES_NAK;
break;
default :
break;
}
break;
case UIS_TOKEN_OUT:
switch ( R8_USB_INT_ST & ( MASK_UIS_TOKEN | MASK_UIS_ENDP ) )
{
case UIS_TOKEN_OUT:
len = R8_USB_RX_LEN;
break;
case UIS_TOKEN_OUT | 1:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP1_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP1_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 2:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP2_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP2_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 3:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP3_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP3_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 4:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP4_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP4_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 5:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP5_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP5_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 6:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP6_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP6_OUT_Deal( len );
}
break;
case UIS_TOKEN_OUT | 7:
if ( R8_USB_INT_ST & RB_UIS_TOG_OK )
{
R8_UEP7_CTRL ^= RB_UEP_R_TOG;
len = R8_USB_RX_LEN;
DevEP7_OUT_Deal( len );
}
break;
}
break;
case UIS_TOKEN_SOF:
break;
default :
break;
}
R8_USB_INT_FG = RB_UIF_TRANSFER;
}
else if( intflag & RB_UIF_BUS_RST )
{
R8_USB_DEV_AD = 0;
R8_UEP0_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP1_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP2_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP3_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP4_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP5_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP6_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_UEP7_CTRL = UEP_R_RES_ACK | UEP_T_RES_NAK;
R8_USB_INT_FG |= RB_UIF_BUS_RST;
}
else if( intflag & RB_UIF_SUSPEND )
{
if ( R8_USB_MIS_ST & RB_UMS_SUSPEND ) {;}
else{;}
R8_USB_INT_FG = RB_UIF_SUSPEND;
}
else
{
R8_USB_INT_FG = intflag;
}
}
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