大神：小弟最近在学习stm32 USB Device模块，很多不懂，希望大神不惜赐教~~~
uint8_t Setup0_Process(void)
{
union
{
uint8_t* b;
uint16_t* w;
} pBuf;
#ifdef STM32F10X_CL
USB_OTG_EP *ep;
uint16_t offset = 0;
ep = PCD_GetOutEP(ENDP0);
pBuf.b = ep->xfer_buff;
#else
uint16_t offset = 1;
pBuf.b = PMAAddr + (uint8_t *)(_GetEPRxAddr(ENDP0) * 2);
#endif /* STM32F10X_CL */
if (pInformation->ControlState != PAUSE)/*请问大神：该如何理解ControlState？？？（ControlState属于DEVICE_INFO 结构体，如下）*/
{
pInformation->USBbmRequestType = *pBuf.b++; /* bmRequestType */
pInformation->USBbRequest = *pBuf.b++; /* bRequest */
pBuf.w += offset; /* word not accessed because of 32 bits addressing */
pInformation->USBwValue = ByteSwap(*pBuf.w++); /* wValue */
pBuf.w += offset; /* word not accessed because of 32 bits addressing */
pInformation->USBwIndex = ByteSwap(*pBuf.w++); /* wIndex */
pBuf.w += offset; /* word not accessed because of 32 bits addressing */
pInformation->USBwLength = *pBuf.w; /* wLength */
}
pInformation->ControlState = SETTING_UP;
if (pInformation->USBwLength == 0)
{
/* Setup with no data stage */
NoData_Setup0();
}
else
{
/* Setup with data stage */
Data_Setup0();
}
return Post0_Process();
}
/*******************************************************************/
typedef struct _DEVICE_INFO
{
uint8_t USBbmRequestType; /* bmRequestType */
uint8_t USBbRequest; /* bRequest */
uint16_t_uint8_t USBwValues; /* wValue */
uint16_t_uint8_t USBwIndexs; /* wIndex */
uint16_t_uint8_t USBwLengths; /* wLength */
uint8_t ControlState; /* of type CONTROL_STATE */
uint8_t Current_Feature;
uint8_t Current_Configuration; /* Selected configuration */
uint8_t Current_Interface; /* Selected interface of current configuration */
uint8_t Current_AlternateSetting;/* Selected Alternate Setting of current
interface*/
ENDPOINT_INFO Ctrl_Info;
}DEVICE_INFO;/*这个结构体的意义是什么？恳请大神指教*/ |
楼主
标题置顶
标题高亮
