usbdrv.c

使用Atmel Mega48开发的USB 接口的HID设备源码

   if(usbRxToken == (uchar)USBPID_SETUP){

#endif
        if(len == 8){   /* Setup size must be always 8 bytes. Ignore otherwise. */
            uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
           if(type == USBRQ_TYPE_STANDARD){
                uchar *replyData = usbTxBuf + 9; /* there is 3 bytes free space at the end of the buffer */
                replyData[0] = 0;   /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
                if(rq->bRequest == USBRQ_GET_STATUS){           /* 0 */
                    uchar __attribute__((__unused__)) recipient = rq->bmRequestType & USBRQ_RCPT_MASK;  /* assign arith ops to variables to enforce byte size */
#if USB_CFG_IS_SELF_POWERED
                    if(recipient == USBRQ_RCPT_DEVICE)
                        replyData[0] =  USB_CFG_IS_SELF_POWERED;
#endif
#if USB_CFG_HAVE_INTRIN_ENDPOINT && USB_CFG_IMPLEMENT_HALT
                    if(usbHalted1 && recipient == USBRQ_RCPT_ENDPOINT && rq->wIndex.bytes[0] == 0x81)   /* request status for endpoint 1 */
                        replyData[0] = 1;
#endif
                    replyData[1] = 0;
                    replyLen = 2;
                }else if(rq->bRequest == USBRQ_SET_ADDRESS){    /* 5 */
                    usbNewDeviceAddr = rq->wValue.bytes[0];
                }else if(rq->bRequest == USBRQ_GET_DESCRIPTOR){ /* 6 */
                    flags = USB_FLG_MSGPTR_IS_ROM | USB_FLG_USE_DEFAULT_RW;
                    if(rq->wValue.bytes[1] == 1){   /* descriptor type requested */
                        replyLen = sizeof(usbDescrDevice);
                        replyData = (uchar *)usbDescrDevice;
                    }else if(rq->wValue.bytes[1] == 2){
                        replyLen = USB_CFG_EXTERNAL_CONFIG_DESCRIPTOR_LENGH;
                        replyData = (uchar *)usbDescrConfig;
                    }else if(rq->wValue.bytes[1] == 3){ /* string descriptor */
                        if(rq->wValue.bytes[0] == 0){   /* descriptor index */
                            replyLen = sizeof(usbDescrString0);
                            replyData = (uchar *)usbDescrString0;
#if USB_CFG_VENDOR_NAME_LEN
                        }else if(rq->wValue.bytes[0] == 1){
                            replyLen = sizeof(usbDescrString1);
                            replyData = (uchar *)usbDescrString1;
#endif
#if USB_CFG_DEVICE_NAME_LEN
                        }else if(rq->wValue.bytes[0] == 2){
                            replyLen = sizeof(usbDescrString2);
                            replyData = (uchar *)usbDescrString2;
#endif
#if USB_CFG_SERIAL_NUMBER_LENGTH
                        }else if(rq->wValue.bytes[0] == 3){
                            replyLen = 2 * USB_CFG_SERIAL_NUMBER_LENGTH + 2;
                            replyData = (uchar *)usbCfgSerialNumberStringDescriptor;
#endif
                        }
                    }
#if USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH
                    else if(rq->wValue.bytes[1] == USBDESCR_HID){           /* 0x21 */
                        replyLen = 9;
                        replyData = (uchar *)usbDescrConfig + 18;
                    }else if(rq->wValue.bytes[1] == USBDESCR_HID_REPORT){   /* 0x22 */
                        replyLen = USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH;
                        replyData = (uchar *)usbHidReportDescriptor;
                    }
#endif
                }else if(rq->bRequest == USBRQ_GET_CONFIGURATION){  /* 8 */
                    replyLen = 1;
                    replyData = &usbConfiguration;  /* send current configuration value */
                }else if(rq->bRequest == USBRQ_SET_CONFIGURATION){  /* 9 */
                    usbConfiguration = rq->wValue.bytes[0];
#if USB_CFG_IMPLEMENT_HALT
                    usbHalted1 = 0;
#endif
                }else if(rq->bRequest == USBRQ_GET_INTERFACE){      /* 10 */
                    replyLen = 1;
#if USB_CFG_HAVE_INTRIN_ENDPOINT
#if USB_CFG_IMPLEMENT_HALT
                }else if(rq->bRequest == USBRQ_CLEAR_FEATURE || rq->bRequest == USBRQ_SET_FEATURE){   /* 1|3 */
                    if(rq->wValue.bytes[0] == 0 && rq->wIndex.bytes[0] == 0x81){   /* feature 0 == HALT for endpoint == 1 */
                        usbHalted1 = rq->bRequest - 1;
                        if(usbHalted1){
                            usbTxBuf1[0] = USBPID_STALL;
                            usbTxLen1 = 2;      /* length including sync byte */
                        }
                        usbTxPacketCnt1 = 0;    /* reset data toggling for interrupt endpoint */
                    }
#endif
                }else if(rq->bRequest == USBRQ_SET_INTERFACE){      /* 11 */
                    usbTxPacketCnt1 = 0;        /* reset data toggling for interrupt endpoint */
#if USB_CFG_IMPLEMENT_HALT
                    usbHalted1 = 0;
#endif
#endif
                }else{
                    /* the following requests can be ignored, send default reply */
                    /* 1: CLEAR_FEATURE, 3: SET_FEATURE, 7: SET_DESCRIPTOR */
                    /* 12: SYNCH_FRAME */
                }
                usbMsgPtr = replyData;  //返回数据的起始地址
                if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0])  /* max length is in */
                    replyLen = rq->wLength.bytes[0];
            }else{  /* not a standard request -- must be vendor or class request */


				uchar *replyData = usbTxBuf +9 ; /* there is 3 bytes free space at the end of the buffer */
                replyData[0] = 0;   /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */




		replyLen = usbFunctionSetup(data);
		//		#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
        //        if(replyLen == 0xff)
		//		{   /* use user-supplied read/write function */
        //            if((rq->bmRequestType & USBRQ_DIR_MASK) == USBRQ_DIR_DEVICE_TO_HOST)
		//			{
        //                replyLen = rq->wLength.bytes[0];    /* IN transfers only */
        //            }
        //            flags = 0;  /* we have no valid msg, use user supplied read/write functions */
        //        } 
		//		#endif  
//===============wt============
				if((rq->bmRequestType==0x21) && (rq->bRequest==0x09))
				{
					SendDataFlag=1;							//收到CMD
					loopnumber=0;
					datalen=0;
					Cmd=0;
					
				}
				if((rq->bmRequestType==0xa1) && (rq->bRequest==0x01))
				{
			 			//The following code ,is example for return data!
						//for the WIN32 app,code the data!just for example
  
//---------返回USB数据-----------------------------					
						flags = USB_FLG_USE_DEFAULT_RW;

			if(flag1==0) replyLen =0x0;
					
                        replyLen =0x40;//sizeof(usbDescrDevice);  每次返回64字节
//-----------------------------
//return DI status
			if(Dflag==1)	
			{
				Dflag=0;
				m_buffer=m_tmpbuffer;
				*m_buffer++ =0xb3;
				*m_buffer++ =0xb3;
				*m_buffer++ =0xb3;
				*m_buffer++ =0x03;
				*m_buffer++ =0xfD;
				*m_buffer++ =0x05;
				m_buffer=m_tmpbuffer;
				tmxor=0;
				for(i=4;i<7;i++)
				{
				tmxor=*(m_buffer+i)^tmxor;			//xor
				}
				*(m_buffer+7)=tmxor;
				

			}

//---------------------------
 
				replyData =m_tmpbuffer;   //replyData是指针，replyData大小有限制<28
				//m_tmpbuffer[0]=0xb3;	//填写数据头和长度，实际数据可去掉
				//m_tmpbuffer[1]=0x40;
				usbMsgPtr = replyData;  //返回数据的起始地址
//----------------------------------------------------		
				}
           }
        }
        /* make sure that data packets which are sent as ACK to an OUT transfer are always zero sized */
    }else{  /* DATA packet from out request */
//SRAM_ADDR 0X0119
//====WT========		
	

//#if USB_CFG_IMPLEMENT_FN_WRITE
//        if(!(usbMsgFlags & USB_FLG_USE_DEFAULT_RW)){
//            uchar rval = usbFunctionWrite(data, len);
		   
//            replyLen = 0xff;
//            if(rval == 0xff){       /* an error occurred */
             /* usbMsgLen = 0xff; cancel potentially pending ACK [has been done by ASM module when OUT token arrived] */
//              usbTxBuf[0] = USBPID_STALL;
//                usbTxLen = 2;       /* length including sync byte */
//            }else if(rval != 0){    /* This was the final package */
//               replyLen = 0;       /* answer with a zero-sized data packet */
//            }
//           flags = 0;    /* start with a DATA1 package, stay with user supplied write() function */
//        }
//#else
//        replyLen = 0;      /* send zero-sized block as ACK */
//#endif


	//the following code is just an example
//----------------接收USB数据----------------------
	if(SendDataFlag==1)
	{
		m_buffer=m_tmpbuffer;
		m_buffer=m_buffer+loopnumber;//Out packet ,the first 8 bytes(00 00 05 00 84 00 00 08)
     	
		for(i=8;i--;)
		{
        	*m_buffer++ = *data++;
			datalen++;
			
		}
		loopnumber+=8;
 
	}
   	if(datalen==0x40) 
   	{
		SendDataFlag=0;	
		loopnumber=0;
		datalen=0;
		Cmd=1;
	 }
		 replyLen = 0;
    }
//-------------------------------
    usbMsgFlags = flags;
    usbMsgLen = replyLen;
}

/* ------------------------------------------------------------------------- */

static void usbBuildTxBlock(void)
{
uchar       wantLen, len, txLen, token;

    wantLen = usbMsgLen;
    if(wantLen > 8)
        wantLen = 8;
    usbMsgLen -= wantLen;
    token = USBPID_DATA1;
    if(usbMsgFlags & USB_FLG_TX_PACKET)
        token = USBPID_DATA0;
    usbMsgFlags++;
    len = usbRead(usbTxBuf + 1, wantLen);
    if(len <= 8){           /* valid data packet */
        usbCrc16Append(&usbTxBuf[1], len);
        txLen = len + 4;    /* length including sync byte */
        if(len < 8)         /* a partial package identifies end of message */
            usbMsgLen = 0xff;
    }else{
        token = USBPID_STALL;
        txLen = 2;          /* length including sync byte */
        usbMsgLen = 0xff;
    }
    usbTxBuf[0] = token;
    usbTxLen = txLen;
#if DEBUG_LEVEL > 1
    DBG2(0x20, usbTxBuf, txLen-1);
#else
    DBG1(0x20, usbTxBuf + 1, 2);
#endif
}

static inline uchar isNotSE0(void)
{
uchar   rval;
/* We want to do
 *     return (USBIN & USBMASK);
 * here, but the compiler does int-expansion acrobatics.
 * We can avoid this by assigning to a char-sized variable.
 */
    rval = USBIN & USBMASK;
    return rval;
}

/* ------------------------------------------------------------------------- */

void    usbPoll(void)
{
	uchar   len;
  	if((len = usbRxLen) > 0){
/* We could check CRC16 here -- but ACK has already been sent anyway. If you
 * need data integrity checks with this driver, check the CRC in your app
 * code and report errors back to the host. Since the ACK was already sent,
 * retries must be handled on application level.
 * unsigned crc = usbCrc16((uchar *)(unsigned)(usbAppBuf + 1), usbRxLen - 3);
 */
        len -= 3;       /* remove PID and CRC */
        if(len < 128){  /* no overflow */
            converter_t appBuf;
            appBuf.ptr = (uchar *)usbRxBuf;  //RECIEVE_DATA ADDR
            appBuf.bytes[0] = usbAppBuf;
            appBuf.bytes[0]++;
            usbProcessRx(appBuf.ptr, len);  //接收到数据后处理 
	        }
#if USB_CFG_HAVE_FLOWCONTROL
        if(usbRxLen > 0)    /* only mark as available if not inactivated */
            usbRxLen = 0;
#else
        usbRxLen = 0;   /* mark rx buffer as available */
#endif
    }
    if(usbMsgLen != 0xff){  /* transmit data pending? */
        if(usbTxLen < 0)    /* transmit system idle */
            usbBuildTxBlock();
    }
    if(isNotSE0()){ /* SE0 state */
        usbIsReset = 0;
    }else{
        /* check whether SE0 lasts for more than 2.5us (3.75 bit times) */
        if(!usbIsReset){
            uchar i;
            for(i=100;i;i--){
                if(isNotSE0())
                    goto notUsbReset;
            }
            usbIsReset = 1;
            usbNewDeviceAddr = 0;
            usbDeviceAddr = 0;
#if USB_CFG_IMPLEMENT_HALT
            usbHalted1 = 0;
#endif
            DBG1(0xff, 0, 0);
notUsbReset:;
        }
    }
}

/* ------------------------------------------------------------------------- */

void    usbInit(void)
{
    usbInputBuf = (uchar)usbRxBuf[0];
    usbAppBuf = (uchar)usbRxBuf[1];
#if USB_INTR_CFG_SET != 0
    USB_INTR_CFG |= USB_INTR_CFG_SET;
#endif
#if USB_INTR_CFG_CLR != 0
    USB_INTR_CFG &= ~(USB_INTR_CFG_CLR);
#endif
    USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT);
}

/* ------------------------------------------------------------------------- */