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].State = RFCOMM_Channel_Closed;
}
void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
{
- const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
+ 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_GetVariableFieldValue(&FrameData);
/* Decode the RFCOMM frame type from the header */
switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
{
- case RFCOMM_Frame_SABM:
- RFCOMM_ProcessSABM(FrameHeader, Channel);
- break;
- case RFCOMM_Frame_UA:
- RFCOMM_ProcessUA(FrameHeader, Channel);
- break;
case RFCOMM_Frame_DM:
- RFCOMM_ProcessDM(FrameHeader, Channel);
+ RFCOMM_ProcessDM(&FrameHeader->Address, Channel);
break;
case RFCOMM_Frame_DISC:
- RFCOMM_ProcessDISC(FrameHeader, Channel);
+ RFCOMM_ProcessDISC(&FrameHeader->Address, Channel);
+ break;
+ case RFCOMM_Frame_SABM:
+ RFCOMM_ProcessSABM(&FrameHeader->Address, Channel);
+ break;
+ case RFCOMM_Frame_UA:
+ RFCOMM_ProcessUA(&FrameHeader->Address, Channel);
break;
case RFCOMM_Frame_UIH:
- RFCOMM_ProcessUIH(FrameHeader, Channel);
+ RFCOMM_ProcessUIH(&FrameHeader->Address, FrameDataLen, FrameData, Channel);
break;
default:
- BT_RFCOMM_DEBUG(1, "<< Unknown Frame Type");
+ BT_RFCOMM_DEBUG(1, "<< Unknown Frame Received");
break;
}
}
-static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+RFCOMM_Channel_t* RFCOMM_GetChannelData(const uint8_t DLCI)
{
- BT_RFCOMM_DEBUG(1, "<< SABM Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
-
- // TODO: Reset channel send/receive state here
+ /* 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];
- BT_RFCOMM_DEBUG(1, ">> UA Sent");
-
- RFCOMM_SendFrame(FrameHeader->Address, RFCOMM_Frame_UA, 0, NULL, Channel);
-}
-
-static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
-{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ /* 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;
+ }
- BT_RFCOMM_DEBUG(1, "<< UA Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ /* Channel not found in the channel state table, return failure */
+ return NULL;
}
-static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
+uint16_t RFCOMM_GetVariableFieldValue(const uint8_t** BufferPos)
{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
-
- BT_RFCOMM_DEBUG(1, "<< DM Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
-}
+ uint8_t FirstOctet;
+ uint8_t SecondOctet = 0;
+
+ 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)++;
-static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
-{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
+ /* Discard any remaining bytes in the variable length field that won't fit in the return value */
+ while (!(**BufferPos & 0x01))
+ (*BufferPos)++;
+ }
- BT_RFCOMM_DEBUG(1, "<< DISC Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
+ /* Bitshift the bytes that comprise the variable length field so that they form a single integer */
+ return (((uint16_t)SecondOctet << 7) | FirstOctet >> 1);
}
-static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
-{
- const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
-
- BT_RFCOMM_DEBUG(1, "<< UIH Received");
- BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
-}
-
-static void RFCOMM_SendFrame(const uint8_t Address, const uint8_t Type, const uint16_t DataLen, const uint8_t* Data,
- Bluetooth_Channel_t* const Channel)
+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)
{
struct
{
RFCOMM_Header_t FrameHeader;
- uint8_t Size[1 + (DataLen >= 128)];
+ uint8_t Size[(DataLen < 128) ? 1 : 2];
uint8_t Data[DataLen];
uint8_t FCS;
} ResponsePacket;
/* Set the frame header values to the specified address and frame type */
- ResponsePacket.FrameHeader.Address = Address;
- ResponsePacket.FrameHeader.Control = Type;
+ ResponsePacket.FrameHeader.Control = Control;
+ ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t)
+ {
+ .EA = true,
+ .CR = CommandResponse,
+ .DLCI = DLCI,
+ };
/* Set the lower 7 bits of the packet length */
ResponsePacket.Size[0] = (DataLen << 1);
/* Copy over the packet data from the source buffer to the response packet buffer */
memcpy(ResponsePacket.Data, Data, DataLen);
- /* Calculate the frame checksum from all fields except the FCS field itself */
- ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket) - sizeof(ResponsePacket.FCS));
+ /* 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);
+ /* Calculate the frame checksum from the appropriate fields */
+ ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, CRCLength);
+
/* Send the completed response packet to the sender */
Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
}
-static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length)
+static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint8_t Length)
{
- const uint8_t* CurrPos = FrameStart;
- uint8_t FCS = 0xFF;
+ uint8_t FCS = 0xFF;
- while (Length--)
- FCS = pgm_read_byte(CRC8_Table[FCS ^ *(CurrPos++)]);
+ for (uint8_t i = 0; i < Length; i++)
+ FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
return ~FCS;
}
-static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos)
+static void RFCOMM_ProcessDM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
{
- uint8_t FirstOctet = *((*BufferPos)++);
- uint8_t SecondOctet = 0;
+ BT_RFCOMM_DEBUG(1, "<< DM Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+}
+
+static void RFCOMM_ProcessDISC(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+ BT_RFCOMM_DEBUG(1, "<< DISC Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+
+ RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
- if (!(FirstOctet & 0x01))
- SecondOctet = *((*BufferPos)++);
+ /* If the requested channel is currently open, destroy it */
+ if (RFCOMMChannel != NULL)
+ RFCOMMChannel->DLCI = 0x00;
+
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+}
+
+static void RFCOMM_ProcessSABM(const RFCOMM_Address_t* const FrameAddress, Bluetooth_Channel_t* const Channel)
+{
+ BT_RFCOMM_DEBUG(1, "<< SABM Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
- return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
+ /* 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];
+
+ /* 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->MTU = 0xFFFF;
+ CurrRFCOMMChannel->Remote.Signals = 0 | (1 << 0);
+ CurrRFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
+ CurrRFCOMMChannel->Local.Signals = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
+ CurrRFCOMMChannel->Local.BreakSignal = 0 | (1 << 0);
+
+ 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)
+{
+ BT_RFCOMM_DEBUG(1, "<< UA Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
}
+static void RFCOMM_ProcessUIH(const RFCOMM_Address_t* const FrameAddress, const uint16_t FrameLength,
+ const uint8_t* FrameData, Bluetooth_Channel_t* const Channel)
+{
+ if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
+ {
+ RFCOMM_ProcessControlCommand(FrameData, Channel);
+ return;
+ }
+
+ BT_RFCOMM_DEBUG(1, "<< UIH Received");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
+ BT_RFCOMM_DEBUG(2, "-- Length 0x%02X", FrameLength);
+
+ puts("RFCOMM Data: ");
+
+ for (uint8_t i = 0; i < FrameLength; i++)
+ printf("0x%02X (%c) ", FrameData[i], FrameData[i]);
+
+ printf("\r\n");
+}
projects / pub / USBasp.git / blobdiff