void Mac::SentFrame(bool aAcked)
{
Address destination;
Neighbor *neighbor;
Sender *sender;
switch (mState)
{
case kStateActiveScan:
mAckTimer.Start(mScanDuration);
break;
case kStateTransmitBeacon:
ScheduleNextTransmission();
break;
case kStateTransmitData:
if (mSendFrame.GetAckRequest() && !aAcked)
{
otDumpDebgMac("NO ACK", mSendFrame.GetHeader(), 16);
if (mTransmitAttempts < kMaxFrameAttempts)
{
mTransmitAttempts++;
StartCsmaBackoff();
ExitNow();
}
mSendFrame.GetDstAddr(destination);
if ((neighbor = mMle.GetNeighbor(destination)) != NULL)
{
neighbor->mState = Neighbor::kStateInvalid;
}
}
mTransmitAttempts = 0;
sender = mSendHead;
mSendHead = mSendHead->mNext;
if (mSendHead == NULL)
{
mSendTail = NULL;
}
mDataSequence++;
sender->HandleSentFrame(mSendFrame);
ScheduleNextTransmission();
break;
default:
assert(false);
break;
}
exit:
{}
}
//*****************************************************************************
//
//! Indicates that a client has written data directly into the buffer and
//! wishes to start transmission.
//!
//! \param psBuffer is the pointer to the buffer instance into which data has
//! been written.
//! \param ulLength is the number of bytes of data that the client has written.
//!
//! This function updates the USB buffer write pointer and starts transmission
//! of the data in the buffer assuming the lower layer is ready to receive a
//! new packet. The function is provided to aid a client wishing to write
//! data directly into the USB buffer rather than using the USBBufferWrite()
//! function. This may be necessary to control when the USB buffer starts
//! transmission of a large block of data, for example.
//!
//! A transmit buffer will immediately send a new packet on any call to
//! USBBufferWrite() if the underlying layer indicates that a transmission can
//! be started. In some cases this is not desirable and a client may wish to
//! write more data to the buffer in advance of starting transmission
//! to the lower layer. In such cases, USBBufferInfoGet() may be called to
//! retrieve the current ring buffer indices and the buffer accessed directly.
//! Once the client has written all data it wishes to send (taking care to
//! handle the ring buffer wrap), it should call this function to indicate that
//! transmission may begin.
//!
//! \return None.
//
//*****************************************************************************
void
USBBufferDataWritten(const tUSBBuffer *psBuffer, unsigned long ulLength)
{
tUSBBufferVars *psVars;
//
// Check parameter validity.
//
ASSERT(psBuffer);
//
// Get our workspace variables.
//
psVars = psBuffer->pvWorkspace;
//
// Advance the ring buffer write pointer to include the newly written
// data.
//
if(ulLength)
{
USBRingBufAdvanceWrite(&psVars->sRingBuf, ulLength);
}
//
// Try to schedule a new packet transmission.
//
ScheduleNextTransmission(psBuffer);
}
//*****************************************************************************
//
// Handles USB_EVENT_TX_COMPLETE for a transmit buffer.
//
// \param psBuffer points to the buffer which is receiving the event.
// \param ulSize is the number of bytes that have been transmitted and
// acknowledged.
//
// This function informs us that data written to the lower layer from a
// transmit buffer has been successfully transmitted. We use this to update
// the buffer read pointer and attempt to schedule the next transmission if
// data remains in the buffer.
//
// \return Returns the number of bytes remaining to be processed.
//
//*****************************************************************************
static unsigned long
HandleTxComplete(tUSBBuffer *psBuffer, unsigned long ulSize)
{
tUSBBufferVars *psVars;
//
// Get a pointer to our workspace variables.
//
psVars = psBuffer->pvWorkspace;
//
// Update the transmit buffer read pointer to remove the data that has
// now been transmitted.
//
USBRingBufAdvanceRead(&psVars->sRingBuf, ulSize);
//
// Try to schedule the next packet transmission if data remains to be
// sent.
//
ScheduleNextTransmission(psBuffer);
//
// The return code from this event is ignored.
//
return(0);
}
//*****************************************************************************
//
//! Indicates that a client has written data directly into the buffer and
//! wishes to start transmission.
//!
//! \param psBuffer is the pointer to the buffer instance into which data has
//! been written.
//! \param ui32Length is the number of bytes of data that the client has
//! written.
//!
//! This function updates the USB buffer write pointer and starts transmission
//! of the data in the buffer assuming the lower layer is ready to receive a
//! new packet. The function is provided to aid a client wishing to write
//! data directly into the USB buffer rather than using the USBBufferWrite()
//! function. This may be necessary to control when the USB buffer starts
//! transmission of a large block of data, for example.
//!
//! A transmit buffer will immediately send a new packet on any call to
//! USBBufferWrite() if the underlying layer indicates that a transmission can
//! be started. In some cases this is not desirable and a client may wish to
//! write more data to the buffer in advance of starting transmission
//! to the lower layer. In such cases, USBBufferInfoGet() may be called to
//! retrieve the current ring buffer indices and the buffer accessed directly.
//! Once the client has written all data it wishes to send (taking care to
//! handle the ring buffer wrap), it should call this function to indicate that
//! transmission may begin.
//!
//! \return None.
//
//*****************************************************************************
void
USBBufferDataWritten(const tUSBBuffer *psBuffer, uint32_t ui32Length)
{
tUSBBufferVars *psPrivate;
//
// Check parameter validity.
//
ASSERT(psBuffer);
//
// Create a writable pointer to the private data.
//
psPrivate = &((tUSBBuffer *)psBuffer)->sPrivateData;
//
// Advance the ring buffer write pointer to include the newly written
// data.
//
if(ui32Length)
{
USBRingBufAdvanceWrite(&psPrivate->sRingBuf, ui32Length);
}
//
// Try to schedule a new packet transmission.
//
ScheduleNextTransmission((tUSBBuffer *)psBuffer);
}
//*****************************************************************************
//
//! Writes a block of data to the transmit buffer and queues it for
//! transmission to the USB controller.
//!
//! \param psBuffer points to the pointer instance into which data is to be
//! written.
//! \param pucData points to the first byte of data which is to be written.
//! \param ulLength is the number of bytes of data to write to the buffer.
//!
//! This function copies the supplied data into the transmit buffer. The
//! transmit buffer data will be packetized according to the constraints
//! imposed by the lower layer in use and sent to the USB controller as soon as
//! possible. Once a packet is transmitted and acknowledged, a
//! \b USB_EVENT_TX_COMPLETE event will be sent to the application callback
//! indicating the number of bytes that have been sent from the buffer.
//!
//! Attempts to send more data than there is space for in the transmit buffer
//! will result in fewer bytes than expected being written. The value returned
//! by the function indicates the actual number of bytes copied to the buffer.
//!
//! \return Returns the number of bytes actually written.
//
//*****************************************************************************
unsigned long
USBBufferWrite(const tUSBBuffer *psBuffer, const unsigned char *pucData,
unsigned long ulLength)
{
unsigned long ulSpace;
tUSBBufferVars *psVars;
//
// Check parameter validity.
//
ASSERT(psBuffer && pucData);
ASSERT(psBuffer->bTransmitBuffer == true);
//
// Get our workspace variables.
//
psVars = psBuffer->pvWorkspace;
//
// How much space is left in the buffer?
//
ulSpace = USBRingBufFree(&psVars->sRingBuf);
//
// How many bytes will we write?
//
ulLength = (ulLength > ulSpace) ? ulSpace : ulLength;
//
// Write the data to the buffer.
//
if(ulLength)
{
USBRingBufWrite(&psVars->sRingBuf, pucData, ulLength);
}
//
// Try to transmit the next packet to the host.
//
ScheduleNextTransmission(psBuffer);
//
// Tell the caller how many bytes we wrote to the buffer.
//
return(ulLength);
}
//*****************************************************************************
//
//! Writes a block of data to the transmit buffer and queues it for
//! transmission to the USB controller.
//!
//! \param psBuffer points to the pointer instance into which data is to be
//! written.
//! \param pui8Data points to the first byte of data which is to be written.
//! \param ui32Length is the number of bytes of data to write to the buffer.
//!
//! This function copies the supplied data into the transmit buffer. The
//! transmit buffer data will be packetized according to the constraints
//! imposed by the lower layer in use and sent to the USB controller as soon as
//! possible. Once a packet is transmitted and acknowledged, a
//! \b USB_EVENT_TX_COMPLETE event will be sent to the application callback
//! indicating the number of bytes that have been sent from the buffer.
//!
//! Attempts to send more data than there is space for in the transmit buffer
//! will result in fewer bytes than expected being written. The value returned
//! by the function indicates the actual number of bytes copied to the buffer.
//!
//! \return Returns the number of bytes actually written.
//
//*****************************************************************************
uint32_t
USBBufferWrite(const tUSBBuffer *psBuffer, const uint8_t *pui8Data,
uint32_t ui32Length)
{
uint32_t ui32Space;
tUSBBufferVars *psPrivate;
//
// Check parameter validity.
//
ASSERT(psBuffer && pui8Data);
ASSERT(psBuffer->bTransmitBuffer == true);
//
// Create a writable pointer to the private data.
//
psPrivate = &((tUSBBuffer *)psBuffer)->sPrivateData;
//
// How much space is left in the buffer?
//
ui32Space = USBRingBufFree(&psPrivate->sRingBuf);
//
// How many bytes will we write?
//
ui32Length = (ui32Length > ui32Space) ? ui32Space : ui32Length;
//
// Write the data to the buffer.
//
if(ui32Length)
{
USBRingBufWrite(&psPrivate->sRingBuf, pui8Data, ui32Length);
}
//
// Try to transmit the next packet to the host.
//
ScheduleNextTransmission((tUSBBuffer *)psBuffer);
//
// Tell the caller how many bytes we wrote to the buffer.
//
return(ui32Length);
}
//*****************************************************************************
//
// Handles USB_EVENT_TX_COMPLETE for a transmit buffer.
//
// \param psBuffer points to the buffer which is receiving the event.
// \param ui32Size is the number of bytes that have been transmitted and
// acknowledged.
//
// This function informs us that data written to the lower layer from a
// transmit buffer has been successfully transmitted. We use this to update
// the buffer read pointer and attempt to schedule the next transmission if
// data remains in the buffer.
//
// \return Returns the number of bytes remaining to be processed.
//
//*****************************************************************************
static uint32_t
HandleTxComplete(tUSBBuffer *psBuffer, uint32_t ui32Size)
{
//
// Update the transmit buffer read pointer to remove the data that has
// now been transmitted.
//
USBRingBufAdvanceRead(&psBuffer->sPrivateData.sRingBuf, ui32Size);
//
// Try to schedule the next packet transmission if data remains to be
// sent.
//
ScheduleNextTransmission(psBuffer);
//
// The return code from this event is ignored.
//
return(0);
}
void Mac::HandleAckTimer(void)
{
otPlatRadioIdle();
switch (mState)
{
case kStateActiveScan:
do
{
mScanChannels >>= 1;
mScanChannel++;
if (mScanChannels == 0 || mScanChannel > kPhyMaxChannel)
{
mActiveScanHandler(mActiveScanContext, NULL);
ScheduleNextTransmission();
ExitNow();
}
}
while ((mScanChannels & 1) == 0);
StartCsmaBackoff();
break;
case kStateTransmitData:
otLogDebgMac("ack timer fired\n");
SentFrame(false);
break;
default:
assert(false);
break;
}
exit:
NextOperation();
}
