usbdma.c

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		{
			sendbuf = USB_DMAGetBuffer(endp);
			sendlen = USB_DMASetTransLength(endp, len);
			memcpy(sendbuf, pBuff + pUsb->cnt, sendlen);
			pUsb->cnt = pUsb->cnt + sendlen;
			USB_DMAStart_IN(endp);								   /* 启动 IN 端点的 DMA 传输 start the DMA transfer of IN endpoint */
		}		
	}
}


/************************************************************************************************************************
** 函数名称:  USB_DMAReadISR()									Name:		USB_DMAReadISR()
** 功能描述:  USB 端点接收中断服务程序	(DMA)					Function:	the reception interrupt service of USB endpoint 
** 输　  入:  CTRL_USB *pUsb:  USB接收与发送控制结构体指针		Input:		CTRL_USB *pUsb: the CTRL_USB structure
			  INT8U		endp:  物理端点号									INT8U	  endp: the number of physical endpoint
** 输　  出:  无												Output:		NULL
*************************************************************************************************************************/
void USB_DMAReadISR(CTRL_USB *pUsb, INT8U endp)
{
	INT8U *pBuff,*recbuf;
	INT32U len,reclen;
	
	if (pUsb->bEpUsed != 0)
	{						   	   					  			 /* 有任务在等待接收    exist task waiting for reception */
		len = pUsb->len - pUsb->cnt;   			   				 /* 计算未接收字节数    calculate the numbers of bytes that will be received */
		pBuff = pUsb->buff;
		if (len > 0)
		{
			recbuf = USB_DMAGetBuffer(endp);					 /* DMA接收缓冲区地址   DMA recbuffer */
			reclen = USB_DMAGetRecLength(endp);					 /* 收到的字节数 		received length */	
			if (len >= reclen)
			{
				memcpy(pBuff + pUsb->cnt, recbuf, reclen);
				pUsb->cnt = pUsb->cnt + reclen;		    		 /* 计数器计数			counter counting */ 
			}
			else
			{
				memcpy(pBuff + pUsb->cnt, recbuf, len);			 /* 从DMA缓冲区取出数据 get data from DMA buffer */
				pUsb->cnt = pUsb->cnt + len;		    		 /* 计数器计数          counter counting */ 
			}
		}		

		/********** 判断是否接收完成 **********/
		if (pUsb->cnt >= pUsb->len)
		{														 /* 如果接收完毕 		if the reception is finished */
 			OSSemPost(Ctrl_Usb[endp - 2].Ep_Sem);
	  	}
	  	else
	  	{
	  		len = pUsb->len - pUsb->cnt;
	  		USB_DMASetTransLength(endp, len);	  				 /* 设置要接收的字节长度set the length that will be received */
	  	}
	}
}					


/************************************************************************************************************
** 函数名称: USB_DMATransferEnd()						Name	 : USB_DMATransferEnd()
** 功能描述: DMA 传输结束中断处理						Function : Process End of DMA Transfer Interrupt 
************************************************************************************************************/
void USB_DMATransferEnd(void)
{
	INT32U ep_st, endp;
	DD_DESCRIPTOR *pDD;
		
	ep_st = USBEoTIntSt;									/* 读传输结束中断寄存器       read End of Transfer Interrupt register */
	
	for (endp = 2; endp <= 5; endp++)
	{
		if(ep_st & (0x01 << endp))
		{													/* endp 端点中断传输结束      endp endpoint Interrupt transfer end */
			if ((endp % 2) != 0)
				USBEPIntEn |= (0x01 << endp);				/* 重新使能该端点从机中断 	  re-Enable the endpoint slave Interrupt */		
															
			pDD = USB_GetDDPointer(endp);
			
			if ((pDD->status & 0x1F) == DDS_OVER_RUN)		/* DMA错误 				   	  DMA error */
				USBEpDMAEn = (0x01 << endp); 			    /* 重新使能该端点的DMA功能    re-enable Endpoint DMA */ 
			
			if ((pDD->status & 0x1F) == DDS_NORMAL_COMP)	/* DMA正常结束 			  	  DMA normal complete */
			{
				if ((endp % 2) != 0)
					USB_DMAWriteISR(&Ctrl_Usb[endp - 2], endp);
				else
					USB_DMAReadISR(&Ctrl_Usb[endp - 2], endp);
			}

			USBEoTIntClr |= (0x01 << endp);					/* 清除传输结束中断状态寄存器 clear end of transfer register */
		}	
			
	}
}


/************************************************************************************************************
** 函数名称: USB_DMASystemError()						Name	 : USB_DMASystemError()
** 功能描述: DMA 系统中断错误处理						Function : Process System Error Interrupt  
************************************************************************************************************/
void USB_DMASystemError(void)
{ 
	INT32U ep_st,endp;

	ep_st = USBSysErrIntSt;							
	
	for (endp = 2; endp < 5; endp++)
	{
		if(ep_st & (0x01 << endp))
		{
			USB_InitEndpointDD(endp);						/* 重新初始化DD               re-Initialize DD */

			USBEpDMAEn = (0x01 << endp);					/* 重新使能该端点的DMA功能    re-enable Endpoint DMA */ 			
			
			USBSysErrIntClr |= (0x01 << endp);				/* 清除系统错误中断			  clear the System error interrupt */
			
			if ((endp % 2) != 0)
				USBEPIntEn |= (0x01 << endp);				/* 重新使能该 IN 端点从机中断 re-Enable the IN endpoint slave Interrupt */
		}		
	}
}


/************************************************************************************************************
** 函数名称: USB_DMANewDDDone()							Name	 : USB_DMANewDDDone()
** 功能描述: DMA 新 DD 请求中断处理						Function : Process New DD Request Interrupt   
************************************************************************************************************/
void USB_DMANewDDDone(CTRL_USB *pUsb, INT8U endp)
{
	INT32U len;
	
	if (pUsb->bEpUsed != 0)
	{						   	   					  	   /* 有任务在等待接收          exist task waiting for reception */
		if (pUsb->cnt >= pUsb->len)
		{												   /* 如果接收完毕 			    if the reception is finished */
 			OSSemPost(Ctrl_Usb[endp - 2].Ep_Sem);
	  	}
	  	else
	  	{
	  		len = pUsb->len - pUsb->cnt;
	  		USB_DMASetTransLength(endp, len);	  		   /* 设置DMA接收/发送的字节长度 set the length of DMA receving/transmitting */
	  	}
	}
}


/************************************************************************************************************
** 函数名称: USB_DMANewDDRequest()						Name	 : USB_DMANewDDRequest()
** 功能描述: DMA 新 DD 请求中断处理						Function : Process New DD Request Interrupt   
************************************************************************************************************/
void USB_DMANewDDRequest(void)
{
	INT32U ep_st,endp;

	ep_st = USBNDDRIntSt;
	
	for (endp = 2; endp <= 5; endp++)
	{
		if(ep_st & (0x01 << endp))
		{											
			USB_DMANewDDDone(&Ctrl_Usb[endp - 2], endp);	/* 重新设置该端点的DD         re-Initialize DD of the endpoint */
				
			USBEpDMAEn = (0x01 << endp);					/* 重新使能该端点的DMA功能    re-enable Endpoint DMA */ 
			
			USBNDDRIntClr = (0x01 << endp);					/* 清除新DD请求中断			  clear the New DD Request Interrupt */

			if ((endp % 2) != 0)
				USBEPIntEn |= (0x01 << endp);				/* 重新使能该端点从机中断 	  re-Enable the endpoint slave Interrupt */
		}		
	}

}


/*
***********************************************************************
*		本文件用到的子程序	 The Subprogram used by this file 
***********************************************************************
*/
	
/************************************************************************************************************
** 函数名称: USB_InitUdcaTable()						Name	 : USB_InitUdcaTable()
** 功能描述: 初始化DMA引擎的UDCA寄存器					Function : Initialize the UDCA reigister and UDCA table 
			 和UDCA表											   of DMA engine 
************************************************************************************************************/
void USB_InitUdcaTable(void)
{
	INT32U *pUDCA;
	
	USBUCDAH = USB_RAM_ADDRESS;							/* 初始化UDCA头寄存器	 Initialize the UDCA register */
	pUDCA = (INT32U *)USBUCDAH;							/* 取出UDCA寄存器值		 Get the value of UDCA register */

	pUDCA[2] = (INT32)DD_ADDRESS_EP02;					/* 建立UDCA表			 Build UDCA table */
	pUDCA[3] = (INT32)DD_ADDRESS_EP03;
	pUDCA[4] = (INT32)DD_ADDRESS_EP04;
	pUDCA[5] = (INT32)DD_ADDRESS_EP05;
}


/************************************************************************************************************
** 函数名称: USB_InitEndpointDD()						Name	 : USB_InitEndpointDD()
** 功能描述: 初始化端点的DD								Function : Initialize the DD of the endpoint
** 输	 入: INT8U endp: 物理端点号						Input	 : INT8U endp: physical endpoint
** 输	 出: 无											Output	 : NULL	
************************************************************************************************************/
void USB_InitEndpointDD(INT8U endp)
{
	DD_DESCRIPTOR *pDD = USB_GetDDPointer(endp);					 /* 取得 DD 指针  	 Get the DD pointer of the endpoint */

	pDD->next_dd_addr = 0;											 /* 清零两个成员 	 Clear two members */
	pDD->status = 0;

	switch(endp)
	{
		case 0x02: 	pDD->control = (EP1_PACKET_SIZE << 5) + 		 /* 写端点信息包大小 Write endpoint packet size */
							       (EP02_DMA_BUFFER_LENGTH << 16);	 /* 写DMA缓冲区大小  Write dma buffer size      */
					pDD->start_addr = DMA_BUFFER_ADDR_EP02;			 /* 写DMA缓冲区地址  Write dma buffer address   */
					break;
					
		case 0x03:  pDD->control = (EP1_PACKET_SIZE << 5) + 
					               (EP03_DMA_BUFFER_LENGTH << 16);
					pDD->start_addr = DMA_BUFFER_ADDR_EP03;
					break;

		case 0x04:  pDD->control = (EP2_PACKET_SIZE << 5) + 
								   (EP04_DMA_BUFFER_LENGTH << 16);
					pDD->start_addr = DMA_BUFFER_ADDR_EP04;
					break;

		case 0x05: 	pDD->control = (EP2_PACKET_SIZE << 5) + 
								   (EP05_DMA_BUFFER_LENGTH << 16);
					pDD->start_addr = DMA_BUFFER_ADDR_EP05;
					break;
					
		default: 	break;
	}
}


/************************************************************************************************************
** 函数名称: USB_GetDDPointer()							Name	 : USB_GetDDPointer()
** 功能描述: 获取端点的DD指针							Function : Get the DD pointer of the endpoint
** 输	 入: INT8U endp:	  物理端点号				Input	 : INT8U endp: physical endpoint
** 返	 回: DD_DESCRIPTOR *  端点的 DD 描述符指针		Return	 : the DD pointer of the endpoint	
************************************************************************************************************/
DD_DESCRIPTOR *USB_GetDDPointer(INT8U endp)
{
	INT32U dd_addr;
	
	dd_addr = DD_BASE_ADDRESS + DD_SIZE * (endp - 2);	/* 计算地址   	 calculate the address */

	return (DD_DESCRIPTOR *)((INT32U *)dd_addr);		/* 转换指针类型  change the type of the pointer */
}


#endif
/*******************************************************************************************************
**                            End Of File
********************************************************************************************************/