USB-mouse.rar_USB Mou

/* ================================================================================================== USB Descriptors for HID class Name : USB.c Author : LiYong Date : 2008.09.20 Compiler: Keil C51 Version : 1.0 Resource: USB module Support MCU: C8051Fxxxx Description : This file contains the USB module for C8051Fxxxx serial MCUs ================================================================================================== */ #include"USB.h" #include"USB_HID_Descriptor.h" #include"USB_Request.h" #include"F32x_USB_Register.h" #define DEVICE_REMOTE_WAKEUP 0x00 // Remote wakeup feature(not used) #define ENDPOINT_HALT 0x00 // Endpoint_Halt feature selector static xdata BYTE UsedMemorySpace[1024] _at_ 0x400; /* ================================================================================================== Status of a endpoint ================================================================================================== */ // Define Endpoint States #define EP_IDLE 0x00 // This signifies Endpoint Idle State #define EP_TX 0x01 // Endpoint Transmit State #define EP_RX 0x02 // Endpoint Receive State #define EP_HALT 0x03 // Endpoint Halt State (return stalls) // Endpoint Stall (send procedural stall next status phase) #define EP_STALL 0x04 // Endpoint Address (change FADDR during next status phase) #define EP_ADDRESS 0x05 /* ================================================================================================== Status of the USB device ================================================================================================== */ // Define device states #define DEV_ATTACHED 0x00 // Device is in Attached State #define DEV_POWERED 0x01 // Device is in Powered State #define DEV_DEFAULT 0x02 // Device is in Default State #define DEV_ADDRESS 0x03 // Device is in Addressed State #define DEV_CONFIGURED 0x04 // Device is in Configured State #define DEV_SUSPENDED 0x05 // Device is in Suspended State // Holds the status for each endpoint code BYTE ONES_PACKET[2] = {0x01, 0x00}; code BYTE ZERO_PACKET[2] = {0x00, 0x00}; /* ================================================================================================== Variables ================================================================================================== */ unsigned char Ep_Status[3] = {EP_IDLE, EP_IDLE, EP_IDLE}; BYTE USB_State; // Holds the current USB State // def. in F32x_USB_Main.h //将USB上电枚举过程，分成几个阶段，在程序中判断阶段而得知当前请求是否有效。 //并在枚举过程中不断更新状态指示。 //----------------------------- // Setup Packet Type Definition //----------------------------- typedef struct { BYTE bmRequestType; // Request recipient, type, direction BYTE bRequest; // Specific standard request number DB16 wValue; // varies according to request DB16 wIndex; // varies according to request DB16 wLength; // Number of bytes to transfer }setup_buffer; // End of Setup Packet Type setup_buffer Setup; //SETUP数据包 unsigned int DataSize; //要返回到主机的字节数 unsigned int DataSent; //已经发出的字节数。 unsigned char* DataPtr; struct { unsigned char OutBuff[EP2_PACKET_SIZE]; unsigned char InBuff[EP1_PACKET_SIZE]; unsigned char DataOK; unsigned char SendReq; }USB; //数据指针，可指向FLASH,XDATA，用于记录返回数据的首地址 /* ================================================================================================== Static internal functions ================================================================================================== */ static void Fifo_Write(BYTE addr, unsigned int uNumBytes, BYTE * pData); static void Fifo_Read(BYTE addr, unsigned int uNumBytes, BYTE * pData) ; static void Force_Stall(void); static void Handle_In1( void ); static void Handle_Out2( void ); static void Get_Status(void); static void USB_Enable( unsigned char sw); //======================================================================================= //功能：发送STALL信号，原因是收到了错误的条件或不希望的传输请求。 void Force_Stall(void) { POLL_WRITE_BYTE(INDEX, 0); POLL_WRITE_BYTE(E0CSR, rbSDSTL); // 发送STALL。 Ep_Status[0] = EP_STALL; // 将断点0置为STALL状态。 } //======================================================================================= //功能：获取状态，可能有三种请求：设备状态，接口状态，端点状态 void Get_Status(void) { //Setup.wLength　应该为2，Setup.wValue应该为0; if ( Setup.wValue.c[MSB] || Setup.wValue.c[LSB] || Setup.wLength.c[MSB] || (Setup.wLength.c[LSB] != 2)) { Force_Stall(); } //判断主机是请求哪种状态，设备？接口？端点？ switch(Setup.bmRequestType) { case OUT_DEVICE: //0x80,请求设备状态。 if (Setup.wIndex.c[MSB] || Setup.wIndex.c[LSB]) { Force_Stall();//Setup.wIndex必须为0,否则，发送STALL信号给主机。 } else { //返回两个字节0，说明，设备不是自供电，而是需要VBUS供电，且不支持远程唤醒。 DataPtr = (BYTE*)&ZERO_PACKET; DataSize = 2; } break; case OUT_INTERFACE: //0x81,请求接口状态 // Only valid if device is configured and non-zero index //只有当USB被配置后，且wIndex为0时才有效。 if ((USB_State != DEV_CONFIGURED) || Setup.wIndex.c[MSB] || Setup.wIndex.c[LSB]) { // Otherwise send stall to host Force_Stall(); //否则发送STALL } else { // Status packet always returns {0x00,0X00} //请求接口状态，总是返回{0X00,0X00} DataPtr = (BYTE*)&ZERO_PACKET; DataSize = 2; } break; // See if recipient was an endpoint case OUT_ENDPOINT: // 0x82:请求端点状态。 // Make sure device is configured and index msb = 0x00 //必须在配置阶段，INDEX指示端点号，所以其高8位必须为0. if ((USB_State != DEV_CONFIGURED) || Setup.wIndex.c[MSB]) { Force_Stall(); // otherwise return stall to host } else { //每个端口只有一个方向，只响应该方向 if ( Setup.wIndex.c[LSB] == IN_EP1 )//EP1为IN,所以只处理IN_EP1 { if ( Ep_Status[1] == EP_HALT ) { // If endpoint is halted, return 0x01,0x00 //如果端口状态为HALT，则返回{0X01,0X00} DataPtr = (BYTE*)&ONES_PACKET; DataSize = 2; } else { // Otherwise return 0x00,0x00 to indicate endpoint active DataPtr = (BYTE*)&ZERO_PACKET; DataSize = 2; } } else { // If request is directed to endpoint 2, send either // 0x01,0x00 if endpoint halted or 0x00,0x00 if endpoint is active if (Setup.wIndex.c[LSB] == OUT_EP2) {