at91_svc_usbout.c

AT91RM9200的USB相关ACM CDC的源代码包！ AT91RM9200-BasicUSBPipe-ARM1_2-2_0.zip

//*----------------------------------------------------------------------------
//*      ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : AT91_SVC_USBOUT.c
//* Object              : DMA service for UDP peripheral
//*
//* 1.0 Jul 30 2002 	: ODi Creation
//*----------------------------------------------------------------------------
#include "AT91_SVC_USBOUT.h"
#include "lib_AT91RM9200.h"

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBOUT_Open
//* \brief Open USBOUT service.
//*----------------------------------------------------------------------------
AT91PS_SVC_USBOUT AT91F_SVC_USBOUT_Open(
	AT91PS_SVC_USBOUT pSvcUdp,  // \arg Pointer to an USBOUT service previously allocated
	AT91PS_UDP pUdp,            // \arg Pointer to UDP registers
	unsigned char epNb,         // \arg Endpoint Number
	unsigned char epSize,       // \arg Endpoint Size
	unsigned char nbBanks)      // \arg UDP DPR banks
{
	pSvcUdp->Handler = AT91F_SVC_USBOUT_Handler;
	pSvcUdp->Read    = AT91F_SVC_USBOUT_Read;

	pSvcUdp->RxComplete    = (AT91PF_SVC_SVCUSBOUT_RxComplete) 0;

	pSvcUdp->clrFlag = AT91C_UDP_RX_DATA_BK0;

	pSvcUdp->pBuffer = (char *) 0;
	pSvcUdp->bufferSize = 0;

	pSvcUdp->pUdp = pUdp;
	pSvcUdp->epNb = epNb;
	pSvcUdp->epSize = epSize;
	pSvcUdp->nbBank = nbBanks;


	return pSvcUdp;
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBOUT_DataOut
//* \brief
//*----------------------------------------------------------------------------
__inline void AT91F_SVC_USBOUT_DataOut(
	AT91PS_SVC_USBOUT pSvcUdp,     // \arg Pointer to an USBOUT service
	AT91PS_UDP pUdp,               // \arg Pointer to UDP registers
	char epNb,                     // \arg Pointer to an endpoint number
	unsigned int epCsr)            // \arg Value of the endpoint CSR
{
	unsigned int bytesReceived, nbBytes;

	// Copy bytes received to the client buffer, check overrun
	bytesReceived = (epCsr & AT91C_UDP_RXBYTECNT) >> 16;
	while (bytesReceived > pSvcUdp->epSize) {
		AT91F_UDP_EpRead(pUdp, epNb);
		--bytesReceived;
	}
	if (bytesReceived > pSvcUdp->bufferSize) {
		bytesReceived = pSvcUdp->bufferSize;
	}

	/*if (bytesReceived > pSvcUdp->epSize)
		bytesReceived = pSvcUdp->epSize;
	*/
		
	pSvcUdp->bufferSize -= bytesReceived;
	nbBytes = bytesReceived;
	while (nbBytes--)
		*(pSvcUdp->pBuffer)++ = AT91F_UDP_EpRead(pUdp, epNb);


	// Clear AT91C_UDP_RX_DATA_BK0 or AT91C_UDP_RX_DATA_BK1 flag
	AT91F_UDP_EpClear(pUdp, epNb, pSvcUdp->clrFlag);
	pSvcUdp->clrFlag = ((pSvcUdp->nbBank > 1) && (pSvcUdp->clrFlag == AT91C_UDP_RX_DATA_BK0)) ?
		AT91C_UDP_RX_DATA_BK1 :
		AT91C_UDP_RX_DATA_BK0;

	// Notify the end of Reception if buffer is full or nb of bytes received < epSize
	if (  (!pSvcUdp->bufferSize) || (bytesReceived < pSvcUdp->epSize) ) {
		AT91F_UDP_DisableIt(pUdp, (1 << epNb));
		if (pSvcUdp->RxComplete)
			pSvcUdp->RxComplete(pSvcUdp);
	}
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBOUT_Handler
//* \brief
//*----------------------------------------------------------------------------
void AT91F_SVC_USBOUT_Handler(
	AT91PS_SVC_USBOUT pSvcUdp)     // \arg Pointer to an USBOUT service
{
	AT91PS_UDP    pUdp = pSvcUdp->pUdp; // Pointer to UDP registers
	unsigned char epNb = pSvcUdp->epNb; // Endpoint number
	unsigned int  epCsr =  AT91F_UDP_EpStatus(pUdp, epNb);

	// test if any DATA OUT occured
	if (epCsr & (AT91C_UDP_RX_DATA_BK0 | AT91C_UDP_RX_DATA_BK1)) {
		AT91F_SVC_USBOUT_DataOut(pSvcUdp, pUdp, epNb, epCsr);
	}

	// Test if a STALL has been acknowledged...
	else if (epCsr) { // !!!!! Should be: AT91C_UDP_STALLSENT) {
		AT91F_UDP_EpClear(pUdp, epNb, (epCsr));
	}

}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBOUT_Read
//* \brief
//*----------------------------------------------------------------------------
void AT91F_SVC_USBOUT_Read(
	AT91PS_SVC_USBOUT pSvcUdp,     // \arg Pointer to an USBOUT service
	char *pBuffer,                 // \arg Pointer to the client buffer to fill
	unsigned int bufferSize,       // \arg Client buffer size
	AT91PF_SVC_SVCUSBOUT_RxComplete Callback) // \arg Callback to invoke when buffer is Full
{
	pSvcUdp->bufferSize = bufferSize;
	pSvcUdp->pBuffer    = pBuffer;
	pSvcUdp->RxComplete = Callback;
	// Enable endpoint 1 & 2 interrupts
	AT91F_UDP_EnableIt(pSvcUdp->pUdp, (1 << pSvcUdp->epNb));
}