pData[nbBytesRcv++] = pUdp->UDP_FDR[AT91C_EP_OUT];
			pUdp->UDP_CSR[AT91C_EP_OUT] &= ~(currentReceiveBank);
			if (currentReceiveBank == AT91C_UDP_RX_DATA_BK0)
				currentReceiveBank = AT91C_UDP_RX_DATA_BK1;
			else
				currentReceiveBank = AT91C_UDP_RX_DATA_BK0;

		}
	}
	pCdc->currentRcvBank = currentReceiveBank;
	return nbBytesRcv;

}

//*----------------------------------------------------------------------------
//* \fn    AT91F_CDC_Write
//* \brief Send through endpoint 2
//*----------------------------------------------------------------------------
static uint AT91F_UDP_Write(AT91PS_CDC pCdc, const char *pData, uint length)
{
	AT91PS_UDP pUdp = pCdc->pUdp;
	uint cpt = 0;

	// Send the first packet
	cpt = MIN(length, AT91C_EP_IN_SIZE);
	length -= cpt;
	while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *pData++;
	pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;

	while (length) {
		// Fill the second bank
		cpt = MIN(length, AT91C_EP_IN_SIZE);
		length -= cpt;
		while (cpt--) pUdp->UDP_FDR[AT91C_EP_IN] = *pData++;
		// Wait for the the first bank to be sent
		while ( !(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) )
			if ( !AT91F_UDP_IsConfigured(pCdc) ) return length;
		pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
		while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);
		pUdp->UDP_CSR[AT91C_EP_IN] |= AT91C_UDP_TXPKTRDY;
	}
	// Wait for the end of transfer
	while ( !(pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP) )
		if ( !AT91F_UDP_IsConfigured(pCdc) ) return length;
	pUdp->UDP_CSR[AT91C_EP_IN] &= ~(AT91C_UDP_TXCOMP);
	while (pUdp->UDP_CSR[AT91C_EP_IN] & AT91C_UDP_TXCOMP);

	return length;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_USB_SendData
//* \brief Send Data through the control endpoint
//*----------------------------------------------------------------------------
unsigned int csrTab[100];
unsigned char csrIdx = 0;

static void AT91F_USB_SendData(AT91PS_UDP pUdp, const char *pData, uint length)
{
	uint cpt = 0;
	AT91_REG csr;

	do {
		cpt = MIN(length, 8);
		length -= cpt;

		while (cpt--)
			pUdp->UDP_FDR[0] = *pData++;

		if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
			pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
			while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
		}

		pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
		do {
			csr = pUdp->UDP_CSR[0];

			// Data IN stage has been stopped by a status OUT
			if (csr & AT91C_UDP_RX_DATA_BK0) {
				pUdp->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
				return;
			}
		} while ( !(csr & AT91C_UDP_TXCOMP) );

	} while (length);

	if (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) {
		pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
		while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
	}
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_USB_SendZlp
//* \brief Send zero length packet through the control endpoint
//*----------------------------------------------------------------------------
void AT91F_USB_SendZlp(AT91PS_UDP pUdp)
{
	pUdp->UDP_CSR[0] |= AT91C_UDP_TXPKTRDY;
	while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP) );
	pUdp->UDP_CSR[0] &= ~(AT91C_UDP_TXCOMP);
	while (pUdp->UDP_CSR[0] & AT91C_UDP_TXCOMP);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_USB_SendStall
//* \brief Stall the control endpoint
//*----------------------------------------------------------------------------
void AT91F_USB_SendStall(AT91PS_UDP pUdp)
{
	pUdp->UDP_CSR[0] |= AT91C_UDP_FORCESTALL;
	while ( !(pUdp->UDP_CSR[0] & AT91C_UDP_ISOERROR) );
	pUdp->UDP_CSR[0] &= ~(AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR);
	while (pUdp->UDP_CSR[0] & (AT91C_UDP_FORCESTALL | AT91C_UDP_ISOERROR));
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_CDC_Enumerate
//* \brief This function is a callback invoked when a SETUP packet is received
//*----------------------------------------------------------------------------
static void AT91F_CDC_Enumerate(AT91PS_CDC pCdc)
{
	AT91PS_UDP pUDP = pCdc->pUdp;
	uchar bmRequestType, bRequest;
	ushort wValue, wIndex, wLength, wStatus;


	if ( !(pUDP->UDP_CSR[0] & AT91C_UDP_RXSETUP) )
		return;

	bmRequestType = pUDP->UDP_FDR[0];
	bRequest      = pUDP->UDP_FDR[0];
	wValue        = (pUDP->UDP_FDR[0] & 0xFF);
	wValue       |= (pUDP->UDP_FDR[0] << 8);
	wIndex        = (pUDP->UDP_FDR[0] & 0xFF);
	wIndex       |= (pUDP->UDP_FDR[0] << 8);
	wLength       = (pUDP->UDP_FDR[0] & 0xFF);
	wLength      |= (pUDP->UDP_FDR[0] << 8);

	if (bmRequestType & 0x80) {
		pUDP->UDP_CSR[0] |= AT91C_UDP_DIR;
		while ( !(pUDP->UDP_CSR[0] & AT91C_UDP_DIR) );
	}
	pUDP->UDP_CSR[0] &= ~AT91C_UDP_RXSETUP;
	while ( (pUDP->UDP_CSR[0]  & AT91C_UDP_RXSETUP)  );

	// Handle supported standard device request Cf Table 9-3 in USB specification Rev 1.1
	switch ((bRequest << 8) | bmRequestType) {
	case STD_GET_DESCRIPTOR:
		if (wValue == 0x100)       // Return Device Descriptor
			AT91F_USB_SendData(pUDP, devDescriptor, MIN(sizeof(devDescriptor), wLength));
		else if (wValue == 0x200)  // Return Configuration Descriptor
			AT91F_USB_SendData(pUDP, cfgDescriptor, MIN(sizeof(cfgDescriptor), wLength));
		else
			AT91F_USB_SendStall(pUDP);
		break;
	case STD_SET_ADDRESS:
		AT91F_USB_SendZlp(pUDP);
		pUDP->UDP_FADDR = (AT91C_UDP_FEN | wValue);
		pUDP->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_FADDEN : 0;
		break;
	case STD_SET_CONFIGURATION:
		pCdc->currentConfiguration = wValue;
		AT91F_USB_SendZlp(pUDP);
		pUDP->UDP_GLBSTATE  = (wValue) ? AT91C_UDP_CONFG : AT91C_UDP_FADDEN;
		pUDP->UDP_CSR[1] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT) : 0;
		pUDP->UDP_CSR[2] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN)  : 0;
		pUDP->UDP_CSR[3] = (wValue) ? (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN)   : 0;
		break;
	case STD_GET_CONFIGURATION:
		AT91F_USB_SendData(pUDP, (char *) &(pCdc->currentConfiguration), sizeof(pCdc->currentConfiguration));
		break;
	case STD_GET_STATUS_ZERO:
		wStatus = 0;
		AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
		break;
	case STD_GET_STATUS_INTERFACE:
		wStatus = 0;
		AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
		break;
	case STD_GET_STATUS_ENDPOINT:
		wStatus = 0;
		wIndex &= 0x0F;
		if ((pUDP->UDP_GLBSTATE & AT91C_UDP_CONFG) && (wIndex <= 3)) {
			wStatus = (pUDP->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
			AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
		}
		else if ((pUDP->UDP_GLBSTATE & AT91C_UDP_FADDEN) && (wIndex == 0)) {
			wStatus = (pUDP->UDP_CSR[wIndex] & AT91C_UDP_EPEDS) ? 0 : 1;
			AT91F_USB_SendData(pUDP, (char *) &wStatus, sizeof(wStatus));
		}
		else
			AT91F_USB_SendStall(pUDP);
		break;
	case STD_SET_FEATURE_ZERO:
		AT91F_USB_SendStall(pUDP);
	    break;
	case STD_SET_FEATURE_INTERFACE:
		AT91F_USB_SendZlp(pUDP);
		break;
	case STD_SET_FEATURE_ENDPOINT:
		wIndex &= 0x0F;
		if ((wValue == 0) && wIndex && (wIndex <= 3)) {
			pUDP->UDP_CSR[wIndex] = 0;
			AT91F_USB_SendZlp(pUDP);
		}
		else
			AT91F_USB_SendStall(pUDP);
		break;
	case STD_CLEAR_FEATURE_ZERO:
		AT91F_USB_SendStall(pUDP);
	    break;
	case STD_CLEAR_FEATURE_INTERFACE:
		AT91F_USB_SendZlp(pUDP);
		break;
	case STD_CLEAR_FEATURE_ENDPOINT:
		wIndex &= 0x0F;
		if ((wValue == 0) && wIndex && (wIndex <= 3)) {
			if (wIndex == 1)
				pUDP->UDP_CSR[1] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_OUT);
			else if (wIndex == 2)
				pUDP->UDP_CSR[2] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_BULK_IN);
			else if (wIndex == 3)
				pUDP->UDP_CSR[3] = (AT91C_UDP_EPEDS | AT91C_UDP_EPTYPE_ISO_IN);
			AT91F_USB_SendZlp(pUDP);
		}
		else
			AT91F_USB_SendStall(pUDP);
		break;

	// handle CDC class requests
	case SET_LINE_CODING:
		while ( !(pUDP->UDP_CSR[0] & AT91C_UDP_RX_DATA_BK0) );
		pUDP->UDP_CSR[0] &= ~(AT91C_UDP_RX_DATA_BK0);
		AT91F_USB_SendZlp(pUDP);
		break;
	case GET_LINE_CODING:
		AT91F_USB_SendData(pUDP, (char *) &line, MIN(sizeof(line), wLength));
		break;
	case SET_CONTROL_LINE_STATE:
		pCdc->currentConnection = wValue;
		AT91F_USB_SendZlp(pUDP);
		break;
	default:
		AT91F_USB_SendStall(pUDP);
	    break;
	}
}