at91_svc_usbctl.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_USBCTL.c
//* Object              : DMA service USB device control enpoint
//*
//* 1.0 Jul 30 2002 	: ODi Creation
//*----------------------------------------------------------------------------
#include "AT91_SVC_USBCTL.h"
#include "lib_AT91RM9200.h"

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_Open
//* \brief Open USBCTL service.
//*----------------------------------------------------------------------------
AT91PS_SVC_USBCTL AT91F_SVC_USBCTL_Open(
	AT91PS_SVC_USBCTL pSvcUdp,  // \arg Pointer to an USBCTL service previously allocated
	AT91PS_UDP pUdp)            // \arg Pointer to UDP registers
{
	pSvcUdp->Handler = AT91F_SVC_USBCTL_Handler;
	pSvcUdp->Read    = AT91F_SVC_USBCTL_Read;
	pSvcUdp->Write   = AT91F_SVC_USBCTL_Write;

	pSvcUdp->DisptachSetup = (AT91PF_SVC_USBCTL_DispatchSetup) 0;
	pSvcUdp->RWComplete    = (AT91PF_SVC_USBCTL_RWComplete) 0;

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

	pSvcUdp->pUdp = pUdp;


	return pSvcUdp;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_DataIn
//* \brief
//*----------------------------------------------------------------------------
static void AT91F_SVC_USBCTL_DataIn(
	AT91PS_SVC_USBCTL pSvcUdp,     // \arg Pointer to an USBCTL service
	AT91PS_UDP pUdp)               // \arg Pointer to UDP registers
{
	char *pBuffer;

	// If bufferSize == 0 Send a Zero length packet
	if (pSvcUdp->bufferSize == 0)
		AT91F_UDP_EpEndOfWr(pUdp, 0);

	// else initialize DPR
	else {
		pBuffer = pSvcUdp->pBuffer;
		if (pSvcUdp->bufferSize >= 8) {
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
			pSvcUdp->bufferSize -= 8;
		}
		else while (pSvcUdp->bufferSize--)
			AT91F_UDP_EpWrite(pUdp, 0, *pBuffer++);
		pSvcUdp->pBuffer = pBuffer;
		AT91F_UDP_EpEndOfWr(pUdp, 0);
	}
	pSvcUdp->eot = !(pSvcUdp->bufferSize);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_DataOut
//* \brief
//*----------------------------------------------------------------------------
__inline char AT91F_SVC_USBCTL_DataOut(
	AT91PS_SVC_USBCTL pSvcUdp,     // \arg Pointer to an USBCTL service
	AT91PS_UDP pUdp,               // \arg Pointer to UDP registers
	unsigned int epCsr)            // \arg Value of the UDP_CSR[0] register
{
	unsigned int bytesReceived;
	char eor; // Detect end of Receive

	// Copy bytes received to the client buffer
	bytesReceived = (epCsr & AT91C_UDP_RXBYTECNT) >> 16;
	if (bytesReceived > pSvcUdp->bufferSize)
		bytesReceived = pSvcUdp->bufferSize;
	pSvcUdp->bufferSize -= bytesReceived;
	// Check the end of a Control OUT sequence: An incomplete packet stops the Data OUT sequence
	eor = (bytesReceived < 8);

	while (bytesReceived--)
		*(pSvcUdp->pBuffer)++ = AT91F_UDP_EpRead(pUdp, 0);
	AT91F_UDP_EpClear(pUdp, 0, (AT91C_UDP_RX_DATA_BK0));

	return eor;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_Handler
//* \brief
//*----------------------------------------------------------------------------
void AT91F_SVC_USBCTL_Handler(
	AT91PS_SVC_USBCTL pSvcUdp)     // \arg Pointer to an USBCTL service
{
	AT91PS_UDP   pUdp = pSvcUdp->pUdp; // Pointer to UDP registers
	unsigned int epCsr =  AT91F_UDP_EpStatus(pUdp, 0);

	// Test if a SETUP packet has been received
	if (epCsr & AT91C_UDP_RXSETUP) {
		// Copy the setup packet
		pSvcUdp->pSetup[0] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[1] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[2] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[3] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[4] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[5] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[6] = AT91F_UDP_EpRead(pUdp, 0);
		pSvcUdp->pSetup[7] = AT91F_UDP_EpRead(pUdp, 0);
		// Set the DIR bit before clearing RXSETUP in Control IN sequence
		if (pSvcUdp->pSetup[0] & 0x80)
			AT91F_UDP_EpSet(pUdp, 0, AT91C_UDP_DIR);
		// Clear RXSETUP
		AT91F_UDP_EpClear(pUdp, 0, AT91C_UDP_RXSETUP);
		// Notify the dispatcher
		if (pSvcUdp->DisptachSetup)
			pSvcUdp->DisptachSetup(pSvcUdp);
	}

	// Test if the previous DATA IN packet is achieved
	else if (epCsr & AT91C_UDP_TXCOMP) {
		AT91F_UDP_EpClear(pUdp, 0, AT91C_UDP_TXCOMP);
		// test end of transmission
		if (pSvcUdp->eot && pSvcUdp->RWComplete)
			pSvcUdp->RWComplete(pSvcUdp);
		// else start new packet transfer
		else
			AT91F_SVC_USBCTL_DataIn(pSvcUdp, pUdp);
	}

	// test if any DATA OUT packet occured
	else if (epCsr & AT91C_UDP_RX_DATA_BK0) {
		// Test if this DATA OUT aborts a CONTROL IN sequence
		if (!(pSvcUdp->eot) && pSvcUdp->RWComplete)
			pSvcUdp->RWComplete(pSvcUdp);
		if (AT91F_SVC_USBCTL_DataOut(pSvcUdp, pUdp, epCsr) && pSvcUdp->RWComplete)
			pSvcUdp->RWComplete(pSvcUdp);
	}

	// Test if a STALL has been acknowledged...
	else if (epCsr & AT91C_UDP_ISOERROR) { // !!!!! Should be: AT91C_UDP_STALLSENT) {
		AT91F_UDP_EpClear(pUdp, 0, (AT91C_UDP_ISOERROR | AT91C_UDP_FORCESTALL));
	}

}


//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_Write
//* \brief
//*----------------------------------------------------------------------------
void AT91F_SVC_USBCTL_Write(
	AT91PS_SVC_USBCTL pSvcUdp,     // \arg Pointer to an USBCTL service
	const char *pBuffer,                 // \arg Pointer to the client buffer to send
	unsigned int bufferSize,       // \arg Client buffer size
	AT91PF_SVC_USBCTL_RWComplete Callback) // \arg Callback to invoke when buffer is Sent
{
	pSvcUdp->bufferSize  = bufferSize;
	pSvcUdp->pBuffer     = (char *)pBuffer;
	pSvcUdp->RWComplete  = Callback;

	AT91F_SVC_USBCTL_DataIn(pSvcUdp, pSvcUdp->pUdp);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_SVC_USBCTL_Read
//* \brief
//*----------------------------------------------------------------------------
void AT91F_SVC_USBCTL_Read(
	AT91PS_SVC_USBCTL pSvcUdp,     // \arg Pointer to an USBCTL service
	char *pBuffer,                 // \arg Pointer to the client buffer to fill
	unsigned int bufferSize,       // \arg Client buffer size
	AT91PF_SVC_USBCTL_RWComplete Callback) // \arg Callback to invoke when buffer is Full
{
	if ((bufferSize == 0) && (Callback)) {
		Callback(pSvcUdp);
		return;
	}
	pSvcUdp->bufferSize = bufferSize;
	pSvcUdp->pBuffer    = pBuffer;
	pSvcUdp->RWComplete = Callback;
}