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Rename RFCOMM_GetFrameDataLength() to RFCOMM_GetVariableFieldValue() as it is multi-purpose, and modify it to move the buffer pointer itself rather than relying on the caller.

Browse Source 
Make RFCOMM_GetChannelData() return NULL if the required channel DLCI is found, but the channel is closed.

Add modem signals (BREAK, DCD, etc.) to the channel state array, and add in a handler for the Modem Status RFCOMM control command.
pull/1469/head
Dean Camera 15 years ago
parent f5d079462d
commit 13ea700b35
4 changed files with 100 additions and 35 deletions
Show Stats Download Patch File Download Diff File

44
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
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@ -77,10 +77,7 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
{
const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
const uint8_t* FrameData = (const uint8_t*)Data + sizeof(RFCOMM_Header_t);
uint16_t FrameDataLen = RFCOMM_GetFrameDataLength(FrameData);
/* Adjust the frame data pointer to skip over the variable size field */
FrameData += (FrameDataLen < 128) ? 1 : 2;
uint16_t FrameDataLen = RFCOMM_GetVariableFieldValue(&FrameData);
/* Decode the RFCOMM frame type from the header */
switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
@ -108,25 +105,40 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)
{
/* Search through the RFCOMM channel list, looking for the specified channel */
for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
{
RFCOMM_Channel_t* CurrRFCOMMChannel = &RFCOMM_Channels[i];
if (CurrRFCOMMChannel->DLCI == DLCI)
/* If the current non-closed channel's DLCI matches the search DLCI, return it to the caller */
if ((CurrRFCOMMChannel->DLCI == DLCI) && (CurrRFCOMMChannel->State != RFCOMM_Channel_Closed))
return CurrRFCOMMChannel;
}
/* Channel not found in the channel state table, return failure */
return NULL;
}
uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)
{
uint8_t FirstOctet = BufferPos[0];
uint8_t FirstOctet;
uint8_t SecondOctet = 0;
if (!(FirstOctet & 0x01))
SecondOctet = BufferPos[1];
FirstOctet = **BufferPos;
(*BufferPos)++;
/* If the field size is more than a single byte, fetch the next byte in the variable length field */
if (!(FirstOctet & 0x01))
{
SecondOctet = **BufferPos;
(*BufferPos)++;
/* Discard any remaining bytes in the variable length field that won't fit in the return value */
while (!(**BufferPos & 0x01))
(*BufferPos)++;
}
/* Bitshift the bytes that comprise the variable length field so that they form a single integer */
return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
}
@ -220,11 +232,13 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluet
/* If the channel's DLCI is zero, the channel state entry is free */
if (!(CurrRFCOMMChannel->DLCI))
{
CurrRFCOMMChannel->DLCI = FrameAddress->DLCI;
CurrRFCOMMChannel->State = RFCOMM_Channel_Open;
CurrRFCOMMChannel->Priority = 7 + (CurrRFCOMMChannel->DLCI >> 3) + ((CurrRFCOMMChannel->DLCI >> 3) * 7);
CurrRFCOMMChannel->UseUIFrames = false;
CurrRFCOMMChannel->RemoteMTU = 0xFFFF;
CurrRFCOMMChannel->DLCI = FrameAddress->DLCI;
CurrRFCOMMChannel->State = RFCOMM_Channel_Open;
CurrRFCOMMChannel->Priority = 7 + (CurrRFCOMMChannel->DLCI >> 3) + ((CurrRFCOMMChannel->DLCI >> 3) * 7);
CurrRFCOMMChannel->UseUIFrames = false;
CurrRFCOMMChannel->MTU = 0xFFFF;
CurrRFCOMMChannel->Signals = 0;
CurrRFCOMMChannel->BreakSignals = 0;
BT_RFCOMM_DEBUG(1, ">> UA Sent");
RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);

7
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
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@ -86,7 +86,10 @@
uint8_t State;
uint8_t Priority;
bool UseUIFrames;
uint16_t RemoteMTU;
uint16_t MTU;
uint8_t StatusFlags;
uint8_t Signals;
uint8_t BreakSignals;
} RFCOMM_Channel_t;
/* External Variables: */
@ -97,7 +100,7 @@
void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel);
RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI);
uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos);
uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos);
void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, const uint8_t Control,
const uint16_t DataLen, const void* Data, Bluetooth_Channel_t* const Channel);

67
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMMControl.c
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@ -42,10 +42,7 @@ void RFCOMM_ProcessControlCommand(const uint8_t* Command, Bluetooth_Channel_t* c
{
const RFCOMM_Command_t* CommandHeader = (const RFCOMM_Command_t*)Command;
const uint8_t* CommandData = (const uint8_t*)Command + sizeof(RFCOMM_Command_t);
uint16_t ControlDataLen = RFCOMM_GetFrameDataLength(CommandData);
/* Adjust the command data pointer to skip over the variable size field */
CommandData += (ControlDataLen < 128) ? 1 : 2;
uint8_t CommandDataLen = RFCOMM_GetVariableFieldValue(&CommandData);
switch (CommandHeader->Command)
{
@ -59,7 +56,7 @@ void RFCOMM_ProcessControlCommand(const uint8_t* Command, Bluetooth_Channel_t* c
RFCOMM_ProcessFCDCommand(CommandHeader, CommandData, Channel);
break;
case RFCOMM_Control_ModemStatus:
RFCOMM_ProcessMSCommand(CommandHeader, CommandData, Channel);
RFCOMM_ProcessMSCommand(CommandHeader, CommandDataLen, CommandData, Channel);
break;
case RFCOMM_Control_RemotePortNegotiation:
RFCOMM_ProcessRPNCommand(CommandHeader, CommandData, Channel);
@ -94,10 +91,48 @@ static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader
BT_RFCOMM_DEBUG(1, "<< FCD Command");
}
static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
Bluetooth_Channel_t* const Channel)
static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
const uint8_t* CommandData, Bluetooth_Channel_t* const Channel)
{
const RFCOMM_MS_Parameters_t* Params = (const RFCOMM_MS_Parameters_t*)CommandData;
BT_RFCOMM_DEBUG(1, "<< MS Command");
BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->Channel.DLCI);
/* Ignore status flags sent to the control channel */
if (Params->Channel.DLCI == RFCOMM_CONTROL_DLCI)
return;
/* Retrieve existing channel configuration data, if already opened */
RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(Params->Channel.DLCI);
/* If the channel does not exist, abort */
if (RFCOMMChannel == NULL)
return;
/* Save the new channel signals to the channel state structure */
RFCOMMChannel->Signals = Params->Signals;
/* If the command contains the optional break signals field, store the value */
if (CommandDataLen == sizeof(RFCOMM_MS_Parameters_t))
RFCOMMChannel->BreakSignals = Params->BreakSignals;
struct
{
RFCOMM_Command_t CommandHeader;
uint8_t Length;
RFCOMM_MS_Parameters_t Params;
} MSResponse;
/* Fill out the MS response data */
MSResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true};
MSResponse.Length = (CommandDataLen << 1) | 0x01;
MSResponse.Params = *Params;
BT_RFCOMM_DEBUG(1, ">> MS Response");
/* Send the PDN response to acknowledge the command */
RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(MSResponse), &MSResponse, Channel);
}
static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
@ -118,7 +153,7 @@ static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader
const RFCOMM_DPN_Parameters_t* Params = (const RFCOMM_DPN_Parameters_t*)CommandData;
BT_RFCOMM_DEBUG(1, "<< DPN Command");
BT_RFCOMM_DEBUG(2, "-- Config DLCI: 0x%02X", Params->DLCI);
BT_RFCOMM_DEBUG(2, "-- DLCI: 0x%02X", Params->DLCI);
/* Ignore parameter negotiations to the control channel */
if (Params->DLCI == RFCOMM_CONTROL_DLCI)
@ -136,8 +171,10 @@ static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader
/* If the channel's DLCI is zero, the channel state entry is free */
if (!(RFCOMM_Channels[i].DLCI))
{
RFCOMMChannel = &RFCOMM_Channels[i];
RFCOMMChannel->DLCI = Params->DLCI;
RFCOMMChannel = &RFCOMM_Channels[i];
RFCOMMChannel->DLCI = Params->DLCI;
RFCOMMChannel->Signals = 0;
RFCOMMChannel->BreakSignals = 0;
break;
}
}
@ -154,7 +191,7 @@ static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader
RFCOMMChannel->State = RFCOMM_Channel_Open;
RFCOMMChannel->Priority = Params->Priority;
RFCOMMChannel->UseUIFrames = (Params->FrameType != 0);
RFCOMMChannel->RemoteMTU = Params->MaximumFrameSize;
RFCOMMChannel->MTU = Params->MaximumFrameSize;
struct
{
@ -164,10 +201,10 @@ static void RFCOMM_ProcessDPNCommand(const RFCOMM_Command_t* const CommandHeader
} DPNResponse;
/* Fill out the DPN response data */
DPNResponse.CommandHeader.Command = CommandHeader->Command;
DPNResponse.CommandHeader.EA = true;
DPNResponse.Length = (sizeof(DPNResponse.Params) << 1) | 0x01;
DPNResponse.Params = *Params;
DPNResponse.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_DLCParameterNegotiation, .EA = true};
DPNResponse.Length = (sizeof(DPNResponse.Params) << 1) | 0x01;
DPNResponse.Params = *Params;
DPNResponse.Params.ConvergenceLayer = 0x00; // TODO: Enable credit based transaction support
BT_RFCOMM_DEBUG(1, ">> DPN Response");

17
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMMControl.h
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@ -50,7 +50,11 @@
#include "RFCOMM.h"
/* Macros: */
#define RFCOMM_
#define RFCOMM_STATUSFLAG_FC (1 << 1)
#define RFCOMM_STATUSFLAG_RTC (1 << 2)
#define RFCOMM_STATUSFLAG_RTR (1 << 3)
#define RFCOMM_STATUSFLAG_IC (1 << 6)
#define RFCOMM_STATUSFLAG_DV (1 << 7)
/* Enums: */
enum RFCOMM_Control_Commands_t
@ -97,6 +101,13 @@
uint8_t MaxRetransmissions;
uint8_t RecoveryWindowSize;
} RFCOMM_DPN_Parameters_t;
typedef struct
{
RFCOMM_Address_t Channel;
uint8_t Signals;
uint8_t BreakSignals;
} RFCOMM_MS_Parameters_t;
/* Function Prototypes: */
void RFCOMM_ProcessControlCommand(const uint8_t* Command, Bluetooth_Channel_t* const Channel);
@ -108,8 +119,8 @@
Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessFCDCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessMSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t CommandDataLen,
const uint8_t* CommandData, Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessRPNCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,
Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessRLSCommand(const RFCOMM_Command_t* const CommandHeader, const uint8_t* CommandData,

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