/*
*********************************************************************************************************
* ScratchUnmount()
*
* Description : Unmounts Scratch from the specified RAW window.
*
* Argument(s) : rawId -- RAW window ID that scratch had been mounted to.
*
* Return(s) : None
*
* Caller(s) : WF Driver
*
* Notes: : None
*
*********************************************************************************************************
*/
void ScratchUnmount(UINT8 rawId)
{
RawMove(rawId, RAW_SCRATCH_POOL, FALSE, 0);
if (rawId == RAW_RX_ID)
{
SetRawWindowState(RAW_RX_ID, WF_RAW_UNMOUNTED);
}
else
{
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
}
}
/*
*********************************************************************************************************
* ScratchUnmount()
*
* Description : Unmounts Scratch from the specified RAW window.
*
* Argument(s) : rawId -- RAW window ID that scratch had been mounted to.
*
* Return(s) : None
*
* Caller(s) : WF Driver
*
* Notes: : None
*
*********************************************************************************************************
*/
void ScratchUnmount(uint8_t rawId)
{
RawMove(rawId, RAW_SCRATCH_POOL, false, 0);
if (rawId == RAW_RX_ID)
{
SetRawWindowState(RAW_RX_ID, WF_RAW_UNMOUNTED);
}
else
{
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
}
}
BOOL AllocateMgmtTxBuffer(UINT16 bytesNeeded)
{
UINT16 bufAvail;
UINT16 byteCount;
/* get total bytes available for MGMT tx memory pool */
bufAvail = Read16BitWFRegister(WF_HOST_WFIFO_BCNT1_REG) & 0x0fff; /* LS 12 bits contain length */
/* if enough bytes available to allocate */
if ( bufAvail >= bytesNeeded )
{
/* allocate and create the new Tx buffer (mgmt or data) */
byteCount = RawMove(RAW_TX_ID, RAW_MGMT_POOL, TRUE, bytesNeeded);
WF_ASSERT(byteCount != 0);
}
/* else not enough bytes available at this time to satisfy request */
else
{
return FALSE;
}
RawWindowReady[RAW_TX_ID] = TRUE;
SetRawWindowState(RAW_TX_ID, WF_RAW_MGMT_MOUNTED);
return TRUE;
}
bool AllocateDataTxBuffer(uint16_t bytesNeeded)
{
uint16_t bufAvail;
uint16_t byteCount;
/* Ensure the MRF24W is awake (only applies if PS-Poll was enabled) */
EnsureWFisAwake();
/* get total bytes available for DATA tx memory pool */
bufAvail = Read16BitWFRegister(WF_HOST_WFIFO_BCNT0_REG) & 0x0fff; /* LS 12 bits contain length */
/* if enough bytes available to allocate */
if ( bufAvail >= bytesNeeded )
{
/* allocate and create the new Tx buffer (mgmt or data) */
byteCount = RawMove(RAW_TX_ID, RAW_DATA_POOL, true, bytesNeeded);
SYS_ASSERT(byteCount != 0, "");
}
/* else not enough bytes available at this time to satisfy request */
else
{
return false;
}
RawWindowReady[RAW_TX_ID] = true;
SetRawWindowState(RAW_TX_ID, WF_RAW_DATA_MOUNTED);
return true;
}
/*****************************************************************************
* FUNCTION: WaitForMgmtRespAndReadData
*
* RETURNS: None
*
* PARAMS: expectedSubtype -- management message subtype that we are expecting
* p_data -- pointer where any desired management data bytes
* will be written
* numDataBytes -- Number of data bytes from mgmt response to write to
* p_data. Data always starts at index 4 of mgmt response.
* skipDataRead -- if TRUE, then no data will be read and the mgmt buffer will not
* be freed. If FALSE, the data will be read and the mgmt buffer
* will be freed.
*
* NOTES: Waits for the mgmt response message and validates it by:
* 1) checking the result field
* 2) verifying that the received subtype matches the execpted subtype
*
* In addition, this function reads the desired number of data bytes from
* the mgmt response, copies them to p_data, and then frees the mgmt buffer.
*****************************************************************************/
void WaitForMgmtResponseAndReadData(UINT8 expectedSubtype,
UINT8 numDataBytes,
UINT8 startIndex,
UINT8 *p_data)
{
tMgmtMsgRxHdr hdr; /* management msg header struct */
WaitForMgmtResponse(expectedSubtype, DO_NOT_FREE_MGMT_BUFFER);
/* if made it here then received a management message */
RawRead(RAW_RX_ID, 0, (UINT16)(sizeof(tMgmtMsgRxHdr)), (UINT8 *)&hdr);
/* check header result and subtype fields */
WF_ASSERT(hdr.result == WF_SUCCESS || hdr.result == WF_ERROR_NO_STORED_BSS_DESCRIPTOR);
WF_ASSERT(hdr.subtype == expectedSubtype);
/* if caller wants to read data from this mgmt response */
if (numDataBytes > 0)
{
RawRead(RAW_RX_ID, startIndex, numDataBytes, p_data);
}
/* free the mgmt buffer */
DeallocateMgmtRxBuffer();
/* if there was a mounted data packet prior to the mgmt tx/rx transaction, then restore it */
if (RestoreRxData == TRUE)
{
RestoreRxData = FALSE;
PopRawWindow(RAW_RX_ID);
SetRawWindowState(RAW_RX_ID, WF_RAW_DATA_MOUNTED);
}
}
/* If a data message mounted in RAW window then will be transmitted to 802.11 network */
void RawSendTxBuffer(UINT16 len)
{
RawMove(RAW_TX_ID, RAW_MAC, FALSE, len);
RawWindowReady[RAW_TX_ID] = FALSE;
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
}
bool AllocateMgmtTxBuffer(uint16_t bytesNeeded)
{
uint16_t bufAvail;
uint16_t byteCount;
/* get total bytes available for MGMT tx memory pool */
bufAvail = Read16BitWFRegister(WF_HOST_WFIFO_BCNT1_REG) & 0x0fff; /* LS 12 bits contain length */
/* if enough bytes available to allocate */
if ( bufAvail >= bytesNeeded )
{
/* allocate and create the new Tx buffer (mgmt or data) */
byteCount = RawMove(RAW_TX_ID, RAW_MGMT_POOL, true, bytesNeeded);
if (byteCount == 0)
return false; // just return and let host retry again
}
/* else not enough bytes available at this time to satisfy request */
else
{
return false;
}
RawWindowReady[RAW_TX_ID] = true;
SetRawWindowState(RAW_TX_ID, WF_RAW_MGMT_MOUNTED);
return true;
}
/*****************************************************************************
Function:
BOOL AllocateDataTxBuffer(UINT16 bytesNeeded)
Summary:
Allocates a Data Tx buffer for use by the TCP/IP stack.
Description:
Determines if WiFi chip has enough memory to allocate a tx data buffer, and,
if so, allocates it.
Precondition:
None
Parameters:
bytesNeeded -- number of bytes needed for the data tx message
Returns:
True if data tx buffer successfully allocated, else False
Remarks:
None
*****************************************************************************/
BOOL AllocateDataTxBuffer(UINT16 bytesNeeded)
{
UINT16 bufAvail;
UINT16 byteCount;
WF_ASSERT(GetRawWindowState(RAW_DATA_TX_ID) != WF_RAW_DATA_MOUNTED);
/* Ensure the MRF24W is awake (only applies if PS-Poll was enabled) */
EnsureWFisAwake();
/* get total bytes available for DATA tx memory pool */
bufAvail = Read16BitWFRegister(WF_HOST_WFIFO_BCNT0_REG) & 0x0fff; /* LS 12 bits contain length */
/* if enough bytes available to allocate */
if ( bufAvail >= bytesNeeded )
{
/* allocate and create the new Tx buffer (mgmt or data) */
byteCount = RawMove(RAW_DATA_TX_ID, RAW_DATA_POOL, TRUE, bytesNeeded);
WF_ASSERT(byteCount != 0);
/* flag this raw window as mounted (in use) */
SetRawWindowState(RAW_DATA_TX_ID, WF_RAW_DATA_MOUNTED);
return TRUE;
}
/* else not enough bytes available at this time to satisfy request */
else
{
return FALSE;
}
}
/* If a data message mounted in RAW window then will be transmitted to 802.11 network */
void RawSendTxBuffer(uint16_t len)
{
RawMove(RAW_TX_ID, RAW_MAC, false, len);
RawWindowReady[RAW_TX_ID] = false;
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
}
/*****************************************************************************
* FUNCTION: SendMgmtMsg
*
* RETURNS: error code
*
* PARAMS: p_header -- pointer to mgmt message header data
* headerLength -- number of bytes in the header
* will be written
* p_data -- pointer to mgmt message data
* dataLength -- number of byte of data
*
* NOTES: Sends a management message
*****************************************************************************/
void SendMgmtMsg(UINT8 *p_header,
UINT8 headerLength,
UINT8 *p_data,
UINT8 dataLength)
{
#if defined(__18CXX)
static UINT32 startTickCount;
static UINT32 maxAllowedTicks;
#else
UINT32 startTickCount;
UINT32 maxAllowedTicks;
#endif
/* cannot send management messages while in WF_ProcessEvent() */
WF_ASSERT(!isInWFProcessEvent());
EnsureWFisAwake();
/* if a Rx Data packet is mounted that has not yet been processed */
if (GetRawWindowState(RAW_RX_ID) == WF_RAW_DATA_MOUNTED)
{
/* save it, so after mgmt response received it can be restored */
PushRawWindow(RAW_RX_ID);
RestoreRxData = TRUE;
}
/* mounts a tx mgmt buffer on the MRF24W when data tx is done */
maxAllowedTicks = TICKS_PER_SECOND / 200; /* 5 ms timeout */
startTickCount = (UINT32)TickGet();
while (!WFisTxMgmtReady() )
{
MACProcess();
/* DEBUG -- REMOVE AFTER FIGURE OUT WHY TIMING OUT (RARELY HAPPENS) */
if (TickGet() - startTickCount >= maxAllowedTicks)
{
/* force flags so WFisTxMgmtReady will return TRUE */
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
RawWindowReady[RAW_TX_ID] = FALSE;
}
}
/* write out management header */
RawSetByte(RAW_TX_ID, p_header, headerLength);
/* write out data (if any) */
if (dataLength > 0)
{
RawSetByte(RAW_TX_ID, p_data, dataLength);
}
/* send mgmt msg to MRF24W */
SendRAWManagementFrame(headerLength + dataLength);
}
/* mounts the most recent Rx message. Could be a management or data message. */
uint16_t RawMountRxBuffer(void)
{
uint16_t length;
length = RawMove(RAW_RX_ID, RAW_MAC, true, 0);
RawWindowReady[RAW_RX_ID] = true;
SetRawWindowState(RAW_RX_ID, WF_RAW_DATA_MOUNTED);
return length;
}
/* mounts the most recent Rx message. Could be a management or data message. */
UINT16 RawMountRxBuffer(void)
{
UINT16 length;
length = RawMove(RAW_RX_ID, RAW_MAC, TRUE, 0);
RawWindowReady[RAW_RX_ID] = TRUE;
SetRawWindowState(RAW_RX_ID, WF_RAW_DATA_MOUNTED);
return length;
}
/*****************************************************************************
* FUNCTION: WaitForMgmtResponse
*
* RETURNS: None
*
* PARAMS: expectedSubtype -- The expected subtype of the mgmt response
* freeAction -- FREE_MGMT_BUFFER or DO_NOT_FREE_MGMT_BUFFER
*
* NOTES: Called after sending a mgmt request. This function waits for a mgmt
* response. The caller can optionally request the the management
* response be freed immediately (by this function) or not freed. If not
* freed the caller is responsible to free the response buffer.
*****************************************************************************/
void WaitForMgmtResponse(UINT8 expectedSubtype, UINT8 freeAction)
{
tMgmtMsgRxHdr hdr;
/* Wait until mgmt response is received */
while (gMgmtConfirmMsgReceived == FALSE)
{
WFProcess();
/* if received a data packet while waiting for mgmt packet */
if (g_HostRAWDataPacketReceived)
{
/* loop until stack has processed the received data message */
while (g_HostRAWDataPacketReceived)
{
StackTask();
}
/* ensure interrupts enabled */
WF_EintEnable();
}
}
/* set this back to FALSE so the next mgmt send won't think he has a response before one is received */
gMgmtConfirmMsgReceived = FALSE;
/* if the caller wants to delete the response immediately (doesn't need any data from it */
if (freeAction == FREE_MGMT_BUFFER)
{
/* read and verify result before freeing up buffer to ensure our message send was successful */
RawRead(RAW_RX_ID, 0, (UINT16)(sizeof(tMgmtMsgRxHdr)), (UINT8 *)&hdr);
/* Mgmt response 'result' field should always indicate success. If this assert is hit the error codes are located */
/* WFApi.h. Search for WF_SUCCESS for the list of error codes. */
WF_ASSERT(hdr.result == WF_SUCCESS);
/* mgmt response subtype had better match subtype we were expecting */
WF_ASSERT(hdr.subtype == expectedSubtype);
/* free mgmt buffer */
DeallocateMgmtRxBuffer();
/* if there was a mounted data packet prior to the mgmt tx/rx transaction, then restore it */
if (RestoreRxData == TRUE)
{
RestoreRxData = FALSE;
PopRawWindow(RAW_RX_ID);
SetRawWindowState(RAW_RX_ID, WF_RAW_DATA_MOUNTED);
}
}
}
/*****************************************************************************
Function:
void DeallocateDataRxBuffer(void)
Summary:
Deallocates a Data Rx buffer
Description:
Typically called by MACGetHeader(), the assumption being that when the stack
is checking for a newly received data message it is finished with the previously
received data message. Also called by MACGetHeader() if the SNAP header is invalid
and the packet is thrown away.
Precondition:
None
Parameters:
None
Returns:
None
Remarks:
None
*****************************************************************************/
void DeallocateDataRxBuffer(void)
{
WF_ASSERT(GetRawWindowState(RAW_DATA_RX_ID) == WF_RAW_DATA_MOUNTED);
/* perform deallocation of raw rx buffer */
RawMove(RAW_DATA_RX_ID, RAW_DATA_POOL, FALSE, 0);
/* set state flag */
SetRawWindowState(RAW_DATA_RX_ID, WF_RAW_UNMOUNTED);
/* the current length of the Rx data packet is now 0 (used by MAC) */
SetRxDataPacketLength(0);
}
/*
*********************************************************************************************************
* ScratchMount()
*
* Description : Mounts Scratch using the specified RAW window.
*
* Argument(s) : rawId -- desired RAW window to mount Scratch to.
*
* Return(s) : None
*
* Caller(s) : WF Driver
*
* Notes: : None
*
*********************************************************************************************************
*/
uint16_t ScratchMount(uint8_t rawId)
{
uint16_t byteCount;
byteCount = RawMove(rawId, RAW_SCRATCH_POOL, true, 0);
if (byteCount == 0)
{
/* work-around, somehow the scratch was already mounted to the other raw window */
rawId = !rawId;
// WF_ASSERT(byteCount > 0); /* scratch mount should always return value > 0 */
}
SetRawWindowState(rawId, WF_SCRATCH_MOUNTED);
return byteCount;
}
/*****************************************************************************
Function:
UINT16 RawMountRxBuffer(UINT8 rawId)
Summary:
Mounts most recent Rx message.
Description:
This function mounts the most recent Rx message from the WiFi chip, which
could be either a management or a data message.
Precondition:
None
Parameters:
rawId -- RAW ID specifying which raw window to mount the rx packet in.
Returns:
length -- number of bytes in the received message.
Remarks:
None
*****************************************************************************/
UINT16 RawMountRxBuffer(UINT8 rawId)
{
UINT16 length;
length = RawMove(rawId, RAW_MAC, TRUE, 0);
WF_ASSERT(length > 0);
/* if mounting a Raw Rx data frame */
if (rawId == RAW_DATA_RX_ID)
{
/* notify WiFi driver that an Rx data frame is mounted */
SetRawWindowState(RAW_DATA_RX_ID, WF_RAW_DATA_MOUNTED);
}
return length;
}
/*****************************************************************************
Function:
void SendRAWDataFrame(UINT16 bufLen)
Summary:
Sends a data frame to the WiFi chip for transmission to the 802.11 network.
Description:
After the TCP/IP stack has created a data frame and called MACFlush() this
function is called to notify the WiFi chip to transmit the data frame to the
802.11 network. The actual data frame starts at index 4 in the allocated buffer.
The first 4 bytes (indexes 0 - 3) were reserved, and this function fills them
in with an internal preamble which notifies the WiFi chip that this is a data
frame to send (as opposed to a management frame).
Precondition:
None
Parameters:
bufLen -- number of data bytes that comprise the data frame.
Returns:
None
Remarks:
None
*****************************************************************************/
void SendRAWDataFrame(UINT16 bufLen)
{
/* create internal preamble */
UINT8 txDataPreamble[4] = { WF_DATA_REQUEST_TYPE, WF_STD_DATA_MSG_SUBTYPE, 1, 0};
/* write out internal preamble, starting at index 0 in the raw window */
RawWrite(RAW_DATA_TX_ID, 0, sizeof(txDataPreamble), txDataPreamble);
/* Notify WiFi device that there is a transmit frame to send . The frame will */
/* be automatically deallocated after RF transmission is completed. */
RawMove(RAW_DATA_TX_ID, RAW_MAC, FALSE, bufLen);
/* this raw window is logically no longer mounted. The WiFi chip will */
/* automatically deallocate after RF transmission. */
SetRawWindowState(RAW_DATA_TX_ID, WF_RAW_UNMOUNTED);
}
/*
*********************************************************************************************************
* ScratchUnmount()
*
* Description : Unmounts Scratch from the specified RAW window.
*
* Argument(s) : rawId -- RAW window ID that scratch had been mounted to.
*
* Return(s) : None
*
* Caller(s) : WF Driver
*
* Notes: : None
*
*********************************************************************************************************
*/
void ScratchUnmount(uint8_t rawId)
{
RawMove(rawId, RAW_SCRATCH_POOL, false, 0);
SetRawWindowState(rawId, WF_RAW_UNMOUNTED);
// if (rawId == RAW_RX_ID)
// {
// SetRawWindowState(RAW_RX_ID, WF_RAW_UNMOUNTED);
// }
// else
// {
// SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
// }
}
/* transmits raw Tx data frame to 802.11 network */
void RawSendTxBuffer(UINT16 len)
{
RawMove(RAW_DATA_TX_ID, RAW_MAC, FALSE, len);
SetRawWindowState(RAW_DATA_TX_ID, WF_RAW_UNMOUNTED);
}
void DeallocateDataTxBuffer(void)
{
RawMove(RAW_DATA_TX_ID, RAW_DATA_POOL, FALSE, 0);
SetRawWindowState(RAW_DATA_TX_ID, WF_RAW_UNMOUNTED);
}
/*****************************************************************************
* FUNCTION: WaitForMgmtResponse
*
* RETURNS: None
*
* PARAMS: expectedSubtype -- The expected subtype of the mgmt response
* freeAction -- FREE_MGMT_BUFFER or DO_NOT_FREE_MGMT_BUFFER
*
* NOTES: Called after sending a mgmt request. This function waits for a mgmt
* response. The caller can optionally request the the management
* response be freed immediately (by this function) or not freed. If not
* freed the caller is responsible to free the response buffer.
*****************************************************************************/
void WaitForMgmtResponse(UINT8 expectedSubtype, UINT8 freeAction)
{
#if defined(__18CXX)
static tMgmtMsgRxHdr hdr;
#else
tMgmtMsgRxHdr hdr;
#endif
g_WaitingForMgmtResponse = TRUE;
/* Wait until mgmt response is received */
while (gMgmtConfirmMsgReceived == FALSE)
{
WFProcess();
/* if received a data packet while waiting for mgmt packet */
if (g_HostRAWDataPacketReceived)
{
// We can't let the StackTask processs data messages that come in while waiting for mgmt
// response because the application might send another mgmt message, which is illegal until the response
// is received for the first mgmt msg. And, we can't prevent the race condition where a data message
// comes in before a mgmt response is received. Thus, the only solution is to throw away a data message
// that comes in while waiting for a mgmt response. This should happen very infrequently. If using TCP then the
// stack takes care of retries. If using UDP, the application has to deal with occasional data messages not being
// received. Also, applications typically do not send a lot of management messages after connected.
// throw away the data rx
RawMountRxBuffer();
DeallocateDataRxBuffer();
g_HostRAWDataPacketReceived = FALSE;
/* ensure interrupts enabled */
WF_EintEnable();
}
}
/* set this back to FALSE so the next mgmt send won't think he has a response before one is received */
gMgmtConfirmMsgReceived = FALSE;
/* if the caller wants to delete the response immediately (doesn't need any data from it */
if (freeAction == FREE_MGMT_BUFFER)
{
/* read and verify result before freeing up buffer to ensure our message send was successful */
RawRead(RAW_RX_ID, 0, (UINT16)(sizeof(tMgmtMsgRxHdr)), (UINT8 *)&hdr);
/* mgmt response subtype had better match subtype we were expecting */
WF_ASSERT(hdr.subtype == expectedSubtype);
if (hdr.result == WF_ERROR_DISCONNECT_FAILED
|| hdr.result == WF_ERROR_NOT_CONNECTED) {
#if defined(STACK_USE_UART)
putrsUART("Disconnect failed. Disconnect is allowed only when module is in connected state\r\n");
#endif
} else if (hdr.result == WF_ERROR_NO_STORED_BSS_DESCRIPTOR) {
#if defined(STACK_USE_UART)
putrsUART("No stored scan results\r\n");
#endif
} else {
WF_ASSERT(hdr.result == WF_SUCCESS);
}
/* free mgmt buffer */
DeallocateMgmtRxBuffer();
/* if there was a mounted data packet prior to the mgmt tx/rx transaction, then restore it */
if (RestoreRxData == TRUE)
{
RestoreRxData = FALSE;
PopRawWindow(RAW_RX_ID);
SetRawWindowState(RAW_RX_ID, WF_RAW_DATA_MOUNTED);
}
}
}
void DeallocateDataTxBuffer(void)
{
RawMove(RAW_TX_ID, RAW_DATA_POOL, false, 0);
RawWindowReady[RAW_TX_ID] = false;
SetRawWindowState(RAW_TX_ID, WF_RAW_UNMOUNTED);
}
