From 637c7b01d0b54646e0d1a71f709a060362793e60 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Sun, 13 Jun 2010 12:37:16 +0000
Subject: [PATCH] More RFCOMM layer additions - begin to add multiplexer
channel state variables.
---
.../Incomplete/BluetoothHost/Lib/RFCOMM.c | 57 +++++++++++++++++--
.../Incomplete/BluetoothHost/Lib/RFCOMM.h | 13 ++++-
2 files changed, 63 insertions(+), 7 deletions(-)
diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
index 75fe17b08..8e533ac72 100644
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
@@ -61,10 +61,16 @@ const uint8_t CRC8_Table[256] PROGMEM =
0xB4, 0x25, 0x57, 0xC6, 0xB3, 0x22, 0x50, 0xC1, 0xBA, 0x2B, 0x59, 0xC8, 0xBD, 0x2C, 0x5E, 0xCF
};
+/** RFCOMM channel state structure, to retain information about each open channel in the RFCOMM multiplexer. */
+RFCOMM_Channel_t RFCOMM_Channels[RFCOMM_MAX_OPEN_CHANNELS];
+
+
/** Initializes the RFCOMM service, ready for new connections from a SDP client. */
void RFCOMM_Initialize(void)
{
- /* Not currently used */
+ /* Reset the RFCOMM channel structures, to invalidate any confiured RFCOMM channels */
+ for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+ RFCOMM_Channels[i].DLCI = 0x00;
}
void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
@@ -122,10 +128,27 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluet
BT_RFCOMM_DEBUG(1, "<< SABM Received");
BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
- // TODO: Reset channel send/receive state
+ /* Find a free entry in the RFCOMM channel multiplexer state array */
+ for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+ {
+ RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i];
- BT_RFCOMM_DEBUG(1, ">> UA Sent");
- RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+ /* If the channel's DLCI is zero, the channel state entry is free */
+ if (!(CurrRFCOMMChannel->DLCI))
+ {
+ CurrRFCOMMChannel->DLCI = FrameAddress->DLCI;
+ CurrRFCOMMChannel->Configured = false;
+
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+ return;
+ }
+ }
+
+ BT_RFCOMM_DEBUG(1, ">> DM Sent");
+
+ /* No free channel in the multiplexer - decline the SABM by sending a DM frame */
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_DM | FRAME_POLL_FINAL), 0, NULL, Channel);
}
static void RFCOMM_ProcessUA(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
@@ -152,6 +175,8 @@ static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const
static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader, Bluetooth_Channel_t* const Channel)
{
+ const uint8_t* CommandData = (const uint8_t*)Data + sizeof(RFCOMM_Command_t);
+
switch (CommandHeader->Command)
{
case RFCOMM_Control_Test:
@@ -174,7 +199,16 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader,
break;
case RFCOMM_Control_DLCParameterNegotiation:
BT_RFCOMM_DEBUG(1, "<< DPN Command");
+
+ // TODO - Set channel state
+// RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(
+ RFCOMMChannel->Configured = true;
+ // TODO - send ACK/NAK response
+ break;
+ default:
+ BT_RFCOMM_DEBUG(1, "<< Unknown Command");
+
struct
{
RFCOMM_Command_t Header;
@@ -193,8 +227,6 @@ static void RFCOMM_ProcessControlCommand(const RFCOMM_Command_t* CommandHeader,
RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, false, RFCOMM_Frame_UIH, sizeof(RFCOMM_Command_t), &Response, Channel);
break;
- default:
- BT_RFCOMM_DEBUG(1, "<< Unknown Command");
}
}
@@ -233,6 +265,7 @@ static void RFCOMM_SendFrame(const uint8_t DLCI, const bool CommandResponse, con
/* Determine the length of the frame which is to be used to calculate the CRC value */
uint8_t CRCLength = sizeof(ResponsePacket.FrameHeader);
+ /* UIH frames do not have the CRC calculated on the Size field in the response, all other frames do */
if ((Control & ~FRAME_POLL_FINAL) != RFCOMM_Frame_UIH)
CRCLength += sizeof(ResponsePacket.Size);
@@ -264,3 +297,15 @@ static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos)
return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
}
+RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI)
+{
+ for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+ {
+ RFCOMM_Channel_t* CurrRFCOMMChannel = RFCOMM_Channels[i];
+
+ if (CurrRFCOMMChannel->DLCI == DLCI)
+ return CurrRFCOMMChannel;
+ }
+
+ return NULL;
+}
diff --git a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
index 8d44c1815..69cab4944 100644
--- a/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
+++ b/Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
@@ -55,6 +55,8 @@
#define FRAME_POLL_FINAL (1 << 4)
#define RFCOMM_CONTROL_DLCI 0
+
+ #define RFCOMM_MAX_OPEN_CHANNELS 5
/* Enums: */
/** Enum for the types of RFCOMM frames which can be exchanged on a Bluetooth channel. */
@@ -98,7 +100,13 @@
unsigned char EA : 1;
unsigned char CR : 1;
unsigned char Command : 6;
- } RFCOMM_Command_t;
+ } RFCOMM_Command_t;
+
+ typedef struct
+ {
+ uint8_t DLCI;
+ bool Configured;
+ } RFCOMM_Channel_t;
/* Function Prototypes: */
void RFCOMM_Initialize(void);
@@ -116,8 +124,11 @@
static 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);
+
static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length);
static uint16_t RFCOMM_GetFrameDataLength(const uint8_t* const BufferPos);
+
+ RFCOMM_Channel_t RFCOMM_GetChannelData(const uint8_t DLCI);
#endif
#endif
--
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