/*
Function: UDP_DisableEndpoints
Disables all endpoints of the UDP peripheral except Control endpoint 0.
*/
static void UDP_DisableEndpoints()
{
unsigned char eptnum;
// Disable each endpoint, terminating any pending transfer
for (eptnum = 1; eptnum < BOARD_USB_NUMENDPOINTS; eptnum++) {
UDP_EndOfTransfer(eptnum, USBD_STATUS_ABORTED);
endpoints[eptnum].state = UDP_ENDPOINT_DISABLED;
}
}
//------------------------------------------------------------------------------
// \brief Disable all endpoints (except control endpoint 0), aborting current
// transfers if necessary.
// \param pUsb Pointer to a S_usb instance
//------------------------------------------------------------------------------
static void UDP_DisableEndpoints(const S_usb *pUsb)
{
S_usb_endpoint *pEndpoint;
unsigned char bEndpoint;
// For each endpoint, if it is enabled, disable it and invoke the callback
// Control endpoint 0 is not disabled
for (bEndpoint = 1; bEndpoint < pUsb->dNumEndpoints; bEndpoint++) {
pEndpoint = USB_GetEndpoint(pUsb, bEndpoint);
UDP_EndOfTransfer(pEndpoint, USB_STATUS_RESET);
pEndpoint->dState = endpointStateDisabled;
}
}
/*
Function: USBD_ConfigureEndpoint
Configures an endpoint according to its Endpoint Descriptor.
Parameters:
descriptor - Pointer to an Endpoint descriptor.
*/
void USBD_ConfigureEndpoint(const USBEndpointDescriptor *descriptor)
{
Endpoint *endpoint;
unsigned char eptnum;
unsigned char type;
unsigned char direction;
// NULL descriptor -> Control endpoint 0
if (descriptor == 0) {
eptnum = 0;
endpoint = &(endpoints[eptnum]);
type = USBEndpointDescriptor_CONTROL;
direction = 0;
endpoint->size = BOARD_USB_ENDPOINTS_MAXPACKETSIZE(0);
}
else {
eptnum = USBEndpointDescriptor_GetNumber(descriptor);
endpoint = &(endpoints[eptnum]);
type = USBEndpointDescriptor_GetType(descriptor);
direction = USBEndpointDescriptor_GetDirection(descriptor);
endpoint->size = USBEndpointDescriptor_GetMaxPacketSize(descriptor);
}
// Abort the current transfer is the endpoint was configured and in
// Write or Read state
if ((endpoint->state == UDP_ENDPOINT_RECEIVING)
|| (endpoint->state == UDP_ENDPOINT_SENDING)) {
UDP_EndOfTransfer(eptnum, USBD_STATUS_RESET);
}
endpoint->state = UDP_ENDPOINT_IDLE;
// Reset Endpoint Fifos
AT91C_BASE_UDP->UDP_RSTEP |= (1 << eptnum);
AT91C_BASE_UDP->UDP_RSTEP &= ~(1 << eptnum);
// Configure endpoint
SET_CSR(eptnum, AT91C_UDP_EPEDS | (type << 8) | (direction << 10));
if (type == USBEndpointDescriptor_CONTROL) {
AT91C_BASE_UDP->UDP_IER = (1 << eptnum);
}
TRACE_INFO( "\r\n# CfgEpt%d ", eptnum);
}
/*
Function: USBD_Halt
Sets the HALT feature on the given endpoint (if not already in this
state).
Parameters:
eptnum - Endpoint number.
*/
void USBD_Halt(unsigned char eptnum)
{
Endpoint *endpoint = &(endpoints[eptnum]);
// Check that endpoint is enabled and not already in Halt state
if ((endpoint->state != UDP_ENDPOINT_DISABLED)
&& (endpoint->state != UDP_ENDPOINT_HALTED)) {
TRACE_INFO( "Halt%d ", eptnum);
// Abort the current transfer if necessary
UDP_EndOfTransfer(eptnum, USBD_STATUS_ABORTED);
// Put endpoint into Halt state
SET_CSR(eptnum, AT91C_UDP_FORCESTALL);
endpoint->state = UDP_ENDPOINT_HALTED;
// Enable the endpoint interrupt
AT91C_BASE_UDP->UDP_IER = 1 << eptnum;
}
}
/*
Function: UDP_EndpointHandler
Endpoint interrupt handler. Manages IN, OUT & SETUP transaction, as well
as the STALL condition.
Parameters:
eptnum - Number of the endpoint to handle interrupt for.
*/
static void UDP_EndpointHandler(unsigned char eptnum)
{
Endpoint *endpoint = &(endpoints[eptnum]);
Transfer *transfer = &(endpoint->transfer);
unsigned int status = AT91C_BASE_UDP->UDP_CSR[eptnum];
//TRACE_INFO( "Ept%d ", eptnum);
//TRACE_INFO( "[");
// Handle interrupts
// IN packet sent
if ((status & AT91C_UDP_TXCOMP) != 0) {
//TRACE_INFO( "Wr ");
// Check that endpoint was in Sending state
if (endpoint->state == UDP_ENDPOINT_SENDING) {
// End of transfer ?
if (UDP_IsTransferFinished(eptnum)) {
// TRACE_INFO( "%d ", transfer->buffered);
transfer->transferred += transfer->buffered;
transfer->buffered = 0;
// Disable interrupt if this is not a control endpoint
if ((status & AT91C_UDP_EPTYPE) != AT91C_UDP_EPTYPE_CTRL) {
AT91C_BASE_UDP->UDP_IDR = 1 << eptnum;
}
UDP_EndOfTransfer(eptnum, USBD_STATUS_SUCCESS);
CLEAR_CSR(eptnum, AT91C_UDP_TXCOMP);
}
else {
// Transfer remaining data
//TRACE_INFO( "PQ:%d ", endpoint->size);
transfer->transferred += endpoint->size;
transfer->buffered -= endpoint->size;
// Send next packet
if (BOARD_USB_ENDPOINTS_BANKS(eptnum) == 1) {
// No double buffering
UDP_WritePayload(eptnum);
SET_CSR(eptnum, AT91C_UDP_TXPKTRDY);
CLEAR_CSR(eptnum, AT91C_UDP_TXCOMP);
}
else {
// Double buffering
SET_CSR(eptnum, AT91C_UDP_TXPKTRDY);
CLEAR_CSR(eptnum, AT91C_UDP_TXCOMP);
UDP_WritePayload(eptnum);
}
}
}
else {
// Acknowledge interrupt
CLEAR_CSR(eptnum, AT91C_UDP_TXCOMP);
}
}
// OUT packet received
if ((status & UDP_RXDATA) != 0) {
//TRACE_INFO( "Rd ");
// Check that the endpoint is in Receiving state
if (endpoint->state != UDP_ENDPOINT_RECEIVING) {
// Check if an ACK has been received on a Control endpoint
if (((status & AT91C_UDP_EPTYPE) == AT91C_UDP_EPTYPE_CTRL)
&& ((status & AT91C_UDP_RXBYTECNT) == 0)) {
// Acknowledge the data and finish the current transfer
///TRACE_INFO( "[%d]Ack ",eptnum);
UDP_ClearRxFlag(eptnum);
UDP_EndOfTransfer(eptnum, USBD_STATUS_SUCCESS);
}
// Check if the data has been STALLed
else if ((status & AT91C_UDP_FORCESTALL) != 0) {
// Discard STALLed data
TRACE_INFO( "[%d]Disc ",eptnum);
UDP_ClearRxFlag(eptnum);
}
// NAK the data
else {
TRACE_INFO( "[%d]Nak ",eptnum);
AT91C_BASE_UDP->UDP_IDR = 1 << eptnum;
}
}
// Endpoint is in Read state
else {
// Retrieve data and store it into the current transfer buffer
unsigned short size = (unsigned short) (status >> 16);
//TRACE_INFO( "-[%d]-", size);
//TRACE_INFO( "Rec ");
UDP_ReadPayload(eptnum, size);
UDP_ClearRxFlag(eptnum);
// Check if the transfer is finished
if ((transfer->remaining == 0) || (size < endpoint->size)) {
// Disable interrupt if this is not a control endpoint
if ((status & AT91C_UDP_EPTYPE) != AT91C_UDP_EPTYPE_CTRL) {
AT91C_BASE_UDP->UDP_IDR = 1 << eptnum;
}
UDP_EndOfTransfer(eptnum, USBD_STATUS_SUCCESS);
}
}
}
// SETUP packet received
if ((status & AT91C_UDP_RXSETUP) != 0) {
//TRACE_INFO( "Stp ");
// If a transfer was pending, complete it
// Handles the case where during the status phase of a control write
// transfer, the host receives the device ZLP and ack it, but the ack
// is not received by the device
if ((endpoint->state == UDP_ENDPOINT_RECEIVING)
|| (endpoint->state == UDP_ENDPOINT_SENDING)) {
UDP_EndOfTransfer(eptnum, USBD_STATUS_SUCCESS);
}
USBGenericRequest request;
UDP_ReadRequest(&request);
// Set the DIR bit before clearing RXSETUP in Control IN sequence
if (USBGenericRequest_GetDirection(&request) == USBGenericRequest_IN) {
SET_CSR(eptnum, AT91C_UDP_DIR);
}
CLEAR_CSR(eptnum, AT91C_UDP_RXSETUP);
// Forward the request to the upper layer
USBDCallbacks_RequestReceived(&request);//------------------------------------
}
// STALL sent
if ((status & AT91C_UDP_STALLSENT) != 0) {
TRACE_INFO( "STA ");
// If the endpoint is not halted, clear the STALL condition
CLEAR_CSR(eptnum, AT91C_UDP_STALLSENT);
if (endpoint->state != UDP_ENDPOINT_HALTED) {
CLEAR_CSR(eptnum, AT91C_UDP_FORCESTALL);
}
}
//TRACE_INFO( "]");
}
//------------------------------------------------------------------------------
// \brief Endpoint interrupt handler.
//
// Handle IN/OUT transfers, received SETUP packets and STALLing
// \param pUsb Pointer to a S_usb instance
// \param bEndpoint Index of endpoint
// \see S_usb
//------------------------------------------------------------------------------
static void UDP_EndpointHandler(const S_usb *pUsb, unsigned char bEndpoint)
{
S_usb_endpoint *pEndpoint = USB_GetEndpoint(pUsb, bEndpoint);
AT91PS_UDP pInterface = UDP_GetDriverInterface(pUsb);
unsigned int dStatus = pInterface->UDP_CSR[bEndpoint];
TRACE_DEBUG_L("Ept%d ", bEndpoint);
// Handle interrupts
// IN packet sent
if (ISSET(dStatus, AT91C_UDP_TXCOMP)) {
TRACE_DEBUG_L("Wr ");
// Check that endpoint was in Write state
if (pEndpoint->dState == endpointStateWrite) {
// End of transfer ?
if ((pEndpoint->dBytesBuffered < pEndpoint->wMaxPacketSize)
||
(!ISCLEARED(dStatus, AT91C_UDP_EPTYPE)
&& (pEndpoint->dBytesRemaining == 0)
&& (pEndpoint->dBytesBuffered == pEndpoint->wMaxPacketSize))) {
TRACE_DEBUG_L("%d ", pEndpoint->dBytesBuffered);
pEndpoint->dBytesTransferred += pEndpoint->dBytesBuffered;
pEndpoint->dBytesBuffered = 0;
// Disable interrupt if this is not a control endpoint
if (!ISCLEARED(dStatus, AT91C_UDP_EPTYPE)) {
SET(pInterface->UDP_IDR, 1 << bEndpoint);
}
UDP_EndOfTransfer(pEndpoint, USB_STATUS_SUCCESS);
}
else {
// Transfer remaining data
TRACE_DEBUG_L("%d ", pEndpoint->wMaxPacketSize);
pEndpoint->dBytesTransferred += pEndpoint->wMaxPacketSize;
pEndpoint->dBytesBuffered -= pEndpoint->wMaxPacketSize;
// Send next packet
if (pEndpoint->dNumFIFO == 1) {
// No double buffering
UDP_WritePayload(pUsb, bEndpoint);
UDP_SETEPFLAGS(pUsb, bEndpoint, AT91C_UDP_TXPKTRDY);
}
else {
// Double buffering
UDP_SETEPFLAGS(pUsb, bEndpoint, AT91C_UDP_TXPKTRDY);
UDP_WritePayload(pUsb, bEndpoint);
}
}
}
// Acknowledge interrupt
UDP_CLEAREPFLAGS(pUsb, bEndpoint, AT91C_UDP_TXCOMP);
}
// OUT packet received
if (ISSET(dStatus, AT91C_UDP_RX_DATA_BK0)
|| ISSET(dStatus, AT91C_UDP_RX_DATA_BK1)) {
TRACE_DEBUG_L("Rd ");
// Check that the endpoint is in Read state
if (pEndpoint->dState != endpointStateRead) {
// Endpoint is NOT in Read state
if (ISCLEARED(dStatus, AT91C_UDP_EPTYPE)
&& ISCLEARED(dStatus, 0xFFFF0000)) {
// Control endpoint, 0 bytes received
// Acknowledge the data and finish the current transfer
TRACE_DEBUG_L("Ack ");
UDP_ClearRXFlag(pUsb, bEndpoint);
UDP_EndOfTransfer(pEndpoint, USB_STATUS_SUCCESS);
}
else if (ISSET(dStatus, AT91C_UDP_FORCESTALL)) {
// Non-control endpoint
// Discard stalled data
TRACE_DEBUG_L("Disc ");
UDP_ClearRXFlag(pUsb, bEndpoint);
}
else {
// Non-control endpoint
// Nak data
TRACE_DEBUG_L("Nak ");
SET(pInterface->UDP_IDR, 1 << bEndpoint);
}
}
else {
// Endpoint is in Read state
// Retrieve data and store it into the current transfer buffer
unsigned short wPacketSize = (unsigned short) (dStatus >> 16);
TRACE_DEBUG_L("%d ", wPacketSize);
UDP_GetPayload(pUsb, bEndpoint, wPacketSize);
UDP_ClearRXFlag(pUsb, bEndpoint);
if ((pEndpoint->dBytesRemaining == 0)
|| (wPacketSize < pEndpoint->wMaxPacketSize)) {
// Disable interrupt if this is not a control endpoint
if (!ISCLEARED(dStatus, AT91C_UDP_EPTYPE)) {
SET(pInterface->UDP_IDR, 1 << bEndpoint);
}
UDP_EndOfTransfer(pEndpoint, USB_STATUS_SUCCESS);
}
}
}
