STM32--USB詳細使用說明

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

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

//主機在完成傳輸前終止傳輸
ControlState = STALLED;
}
else if ((ControlState == OUT_DATA) || (ControlState == LAST_OUT_DATA))
{
DataStageOut();
ControlState = pInformation->ControlState;
}

else if (ControlState == WAIT_STATUS_OUT)//進入到這個里面
{
(*pProperty->Process_Status_OUT)();//這個函數其實什么也沒做
#ifndef STM32F10X_CL
ControlState = STALLED;//狀態變成了終止發送和接受

#endif
}

else
{
ControlState = STALLED;
}

pInformation->ControlState = ControlState;

return Post0_Process();
}

***************（5）**************

獲取設備描述符以后，主機再一次的復位設備，設備又進入初始狀態。開始枚舉的第二步設置地址。

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

if (Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT)) //設備請求
{

else if (RequestNo == SET_ADDRESS) /設置地址
{
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();//準備好發送０字節的狀態數據包SetEPTxCount(ENDP0, 0);

//vSetEPTxStatus(EP_TX_VALID);建立階段后直接的進入狀態階段

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)) //控制狀態
{
DataStageIn();//第一次取設備描述符只取一次 當前的狀態變為WAIT_STATUS_IN 表明設備等待狀態過程 主機輸出0字節

ControlState = pInformation->ControlState;
}

else if (ControlState == WAIT_STATUS_IN) //設置地址狀態階段進入這個程序
{
if ((pInformation->USBbRequest == SET_ADDRESS) &&
(Type_Recipient == (STANDARD_REQUEST | DEVICE_RECIPIENT)))
{
SetDeviceAddress(pInformation->USBwValue0);//設置使用新的地址
pUser_Standard_Requests->User_SetDeviceAddress();
}
(*pProperty->Process_Status_IN)();
ControlState = STALLED; //終止發送和接受

}

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);//設置端點0 要接受的字節數

if (pInformation->ControlState == STALLED)//這種狀態下只接受SETUP命令包
{
vSetEPRxStatus(EP_RX_STALL);//終止端點０接受
vSetEPTxStatus(EP_TX_STALL);//終止端點０發送

}

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

***************（６）*************

從新地址獲取設備描述符