STM32--USB详细使用说明

uint8_t Out0_Process(void)
{
uint32_t ControlState = pInformation->ControlState;

if ((ControlState == IN_DATA) || (ControlState == LAST_IN_DATA))
{

//主机在完成传输前终止传输
ControlState = STALLED;
}
else if ((ControlState == OUT_DATA) || (ControlState == LAST_OUT_DATA))
{
DataStageOut();
ControlState = pInformation->ControlState;
}

else if (ControlState == WAIT_STATUS_OUT)//进入到这个里面
{
(*pProperty->Process_Status_OUT)();//这个函数其实什么也没做
#ifndef STM32F10X_CL
ControlState = STALLED;//状态变成了终止发送和接受

#endif
}

else
{
ControlState = STALLED;
}

pInformation->ControlState = ControlState;

return Post0_Process();
}

***************（5）**************

获取设备描述符以后，主机再一次的复位设备，设备又进入初始状态。开始枚举的第二步设置地址。

void NoData_Setup0(void)
{
RESULT Result = USB_UNSUPPORT;
uint32_t RequestNo = pInformation->USBbRequest;
uint32_t ControlState;

if (Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT)) //设备请求
{

else if (RequestNo == SET_ADDRESS) /设置地址
{
if ((pInformation->USBwValue0 > 127) || (pInformation->USBwValue1 != 0)
|| (pInformation->USBwIndex != 0)
|| (pInformation->Current_Configuration != 0))

{
ControlState = STALLED;
goto exit_NoData_Setup0;
}
else
{
Result = USB_SUCCESS;

#ifdef STM32F10X_CL
SetDeviceAddress(pInformation->USBwValue0);
#endif
}
}

ControlState = WAIT_STATUS_IN;

USB_StatusIn();//准备好发送０字节的状态数据包SetEPTxCount(ENDP0, 0);

//vSetEPTxStatus(EP_TX_VALID);建立阶段后直接的进入状态阶段

exit_NoData_Setup0:
pInformation->ControlState = ControlState;
return;
}

uint8_t In0_Process(void)
{
uint32_t ControlState = pInformation->ControlState;

if ((ControlState == IN_DATA) || (ControlState == LAST_IN_DATA)) //控制状态
{
DataStageIn();//第一次取设备描述符只取一次 当前的状态变为WAIT_STATUS_IN 表明设备等待状态过程 主机输出0字节

ControlState = pInformation->ControlState;
}

else if (ControlState == WAIT_STATUS_IN) //设置地址状态阶段进入这个程序
{
if ((pInformation->USBbRequest == SET_ADDRESS) &&
(Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT)))
{
SetDeviceAddress(pInformation->USBwValue0);//设置使用新的地址
pUser_Standard_Requests->User_SetDeviceAddress();
}
(*pProperty->Process_Status_IN)();
ControlState = STALLED; //终止发送和接受

}

else
{
ControlState = STALLED;
}

pInformation->ControlState = ControlState;

return Post0_Process();
}

uint8_t Post0_Process(void)
{
#ifdef STM32F10X_CL
USB_OTG_EP *ep;
#endif
SetEPRxCount(ENDP0, Device_Property.MaxPacketSize);//设置端点0 要接受的字节数

if (pInformation->ControlState == STALLED)//这种状态下只接受SETUP命令包
{
vSetEPRxStatus(EP_RX_STALL);//终止端点０接受
vSetEPTxStatus(EP_TX_STALL);//终止端点０发送

}

return (pInformation->ControlState == PAUSE);
}

***************（６）*************

从新地址获取设备描述符