void lan8720Tick(NetInterface *interface)
{
//STM32F4-DISCOVERY evaluation board?
#if defined(USE_STM32F4_DISCOVERY)
uint16_t value;
bool_t linkState;
//Read basic status register
value = lan8720ReadPhyReg(interface, LAN8720_PHY_REG_BMSR);
//Retrieve current link state
linkState = (value & BMSR_LINK_STATUS) ? TRUE : FALSE;
//Link up event?
if(linkState && !interface->linkState)
{
//A PHY event is pending...
interface->phyEvent = TRUE;
//Notify the user that the link state has changed
osEventSet(interface->nicRxEvent);
}
//Link down event?
else if(!linkState && interface->linkState)
{
//A PHY event is pending...
interface->phyEvent = TRUE;
//Notify the user that the link state has changed
osEventSet(interface->nicRxEvent);
}
#endif
}
void udpUpdateEvents(Socket *socket)
{
//Clear event flags
socket->eventFlags = 0;
//The socket is marked as readable if a datagram is pending in the queue
if(socket->receiveQueue)
socket->eventFlags |= SOCKET_EVENT_RX_READY;
//Check whether the socket is bound to a particular network interface
if(socket->interface != NULL)
{
//Handle link up and link down events
if(socket->interface->linkState)
socket->eventFlags |= SOCKET_EVENT_LINK_UP;
else
socket->eventFlags |= SOCKET_EVENT_LINK_DOWN;
}
//Mask unused events
socket->eventFlags &= socket->eventMask;
//Any event to signal?
if(socket->eventFlags)
{
//Unblock I/O operations currently in waiting state
osEventSet(socket->event);
//Set user event to signaled state if necessary
if(socket->userEvent != NULL)
osEventSet(socket->userEvent);
}
}
void dhcpv6RelayTask(void *param)
{
error_t error;
uint_t i;
//Point to the DHCPv6 relay agent context
Dhcpv6RelayCtx *context = (Dhcpv6RelayCtx *) param;
//Specify the events the application is interested in for
//each client-facing sockets
for(i = 0; i < context->clientInterfaceCount; i++)
{
context->eventDesc[i].socket = context->clientSocket[i];
context->eventDesc[i].eventMask = SOCKET_EVENT_RX_READY;
}
//Specify the events the application is interested in for
//the network-facing socket
context->eventDesc[i].socket = context->serverSocket;
context->eventDesc[i].eventMask = SOCKET_EVENT_RX_READY;
//Main loop
while(1)
{
//Wait for incoming packets on network-facing or client-facing interfaces
error = socketPoll(context->eventDesc, context->clientInterfaceCount + 1,
context->event, INFINITE_DELAY);
//Stop DHCPv6 relay agent?
if(context->stopRequest)
{
//The DHCPv6 relay agent is about to stop
context->stopRequest = FALSE;
context->running = FALSE;
//Acknowledge the reception of the user request
osEventSet(context->ackEvent);
//Kill ourselves
osTaskDelete(NULL);
}
//Verify status code
if(!error)
{
//Check the state of each client-facing socket
for(i = 0; i < context->clientInterfaceCount; i++)
{
//Relay client messages if applicable
if(context->eventDesc[i].eventFlags & SOCKET_EVENT_RX_READY)
dhcpv6ForwardClientMessage(context, i);
}
//Check the state of the network-facing socket
if(context->eventDesc[i].eventFlags & SOCKET_EVENT_RX_READY)
{
//Forward Relay-Reply messages from the network
dhcpv6ForwardRelayReplyMessage(context);
}
}
}
}
error_t dhcpv6RelayStop(Dhcpv6RelayCtx *context)
{
uint_t i;
//Debug message
TRACE_INFO("Stopping DHCPv6 relay agent...\r\n");
//Ensure the specified pointer is valid
if(!context)
return ERROR_INVALID_PARAMETER;
//Check DHCPv6 relay agent state
if(!context->running)
return ERROR_WRONG_STATE;
//Reset ACK event before sending the kill signal
osEventReset(context->ackEvent);
//Stop the DHCPv6 relay agent task
context->stopRequest = TRUE;
//Send a signal to the task in order to abort any blocking operation
osEventSet(context->event);
//Wait for the process to terminate...
osEventWait(context->ackEvent, INFINITE_DELAY);
//Leave the All_DHCP_Relay_Agents_and_Servers multicast group
//for each client-facing interface
dhcpv6RelayLeaveMulticastGroup(context);
//Close the socket that carries traffic towards the DHCPv6 server
socketClose(context->serverSocket);
//Properly dispose the sockets that carry traffic towards the DHCPv6 clients
for(i = 0; i < context->clientInterfaceCount; i++)
socketClose(context->clientSocket[i]);
//Close event objects
osEventClose(context->event);
osEventClose(context->ackEvent);
//Successful processing
return NO_ERROR;
}
void icecastClientTask(void *param)
{
error_t error;
bool_t end;
size_t n;
size_t length;
size_t received;
IcecastClientContext *context;
//Retrieve the Icecast client context
context = (IcecastClientContext *) param;
//Main loop
while(1)
{
//Initiate a connection to the Icecast server
error = icecastClientConnect(context);
//Connection to server failed?
if(error)
{
//Debug message
TRACE_ERROR("Connection to Icecast server failed!\r\n");
//Recovery delay
osDelay(ICECAST_RECOVERY_DELAY);
//Try to reconnect...
continue;
}
//Debug message
TRACE_INFO("Block size = %u\r\n", context->blockSize);
//Check block size
if(!context->blockSize)
{
socketClose(context->socket);
continue;
}
//Initialize loop condition variable
end = FALSE;
//Read as much data as possible...
while(!end)
{
//Process the stream block by block
length = context->blockSize;
//Read current block
while(!end && length > 0)
{
//Wait for the buffer to be available for writing
osEventWait(context->writeEvent, INFINITE_DELAY);
//Enter critical section
osMutexAcquire(context->mutex);
//Compute the number of bytes to read at a time
n = min(length, context->bufferSize - context->bufferLength);
//Leave critical section
osMutexRelease(context->mutex);
//Check whether the specified data crosses buffer boundaries
if((context->writeIndex + n) > context->bufferSize)
n = context->bufferSize - context->writeIndex;
//Receive data
error = socketReceive(context->socket, context->streamBuffer +
context->writeIndex, n, &received, SOCKET_FLAG_WAIT_ALL);
//Make sure the expected number of bytes have been received
if(error || received != n)
end = TRUE;
//Enter critical section
osMutexAcquire(context->mutex);
//Increment write index
context->writeIndex += n;
//Wrap around if necessary
if(context->writeIndex >= context->bufferSize)
context->writeIndex -= context->bufferSize;
//Update buffer length
context->bufferLength += n;
//Check whether the buffer is available for writing
if(context->bufferLength < context->bufferSize)
osEventSet(context->writeEvent);
//Check whether the buffer is available for reading
if(context->bufferLength > 0)
osEventSet(context->readEvent);
//Leave critical section
osMutexRelease(context->mutex);
//Update the total number of bytes that have been received
context->totalLength += n;
//Number of remaining data to read
length -= n;
}
//Debug message
TRACE_DEBUG("Total bytes received = %u\r\n", context->totalLength);
//Check whether the metadata block should be read
if(!end)
{
//Process the metadata block
error = icecastClientProcessMetadata(context);
//Any error to report?
if(error) end = TRUE;
}
}
//Close connection
socketClose(context->socket);
}
}
error_t icecastClientReadStream(IcecastClientContext *context,
uint8_t *data, size_t size, size_t *length, time_t timeout)
{
bool_t status;
//Ensure the parameters are valid
if(!context || !data)
return ERROR_INVALID_PARAMETER;
//Wait for the buffer to be available for reading
status = osEventWait(context->readEvent, timeout);
//Timeout error?
if(!status) return ERROR_TIMEOUT;
//Enter critical section
osMutexAcquire(context->mutex);
//Compute the number of bytes to read at a time
*length = min(size, context->bufferLength);
//Leave critical section
osMutexRelease(context->mutex);
//Check whether the specified data crosses buffer boundaries
if((context->readIndex + *length) <= context->bufferSize)
{
//Copy the data
memcpy(data, context->streamBuffer + context->readIndex, *length);
}
else
{
//Copy the first part of the data
memcpy(data, context->streamBuffer + context->readIndex,
context->bufferSize - context->readIndex);
//Wrap around to the beginning of the circular buffer
memcpy(data + context->bufferSize - context->readIndex, context->streamBuffer,
*length - context->bufferSize + context->readIndex);
}
//Enter critical section
osMutexAcquire(context->mutex);
//Increment read index
context->readIndex += *length;
//Wrap around if necessary
if(context->readIndex >= context->bufferSize)
context->readIndex -= context->bufferSize;
//Update buffer length
context->bufferLength -= *length;
//Check whether the buffer is available for writing
if(context->bufferLength < context->bufferSize)
osEventSet(context->writeEvent);
//Check whether the buffer is available for reading
if(context->bufferLength > 0)
osEventSet(context->readEvent);
//Leave critical section
osMutexRelease(context->mutex);
//Successful read operation
return NO_ERROR;
}