RFCOMM_Channels[i].State = RFCOMM_Channel_Closed;
}
+void RFCOMM_ServiceChannels(Bluetooth_Channel_t* const BluetoothChannel)
+{
+ for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+ {
+ RFCOMM_Channel_t* RFCOMMChannel = &RFCOMM_Channels[i];
+
+ if (RFCOMMChannel->State == RFCOMM_Channel_Configure)
+ {
+ /* Check if the local signals have not yet been sent on the current channel */
+ if (!(RFCOMMChannel->ConfigFlags & RFCOMM_CONFIG_LOCALSIGNALSSENT))
+ {
+ /* Indicate that the local signals have been sent, transmit them to the remote device */
+ RFCOMMChannel->ConfigFlags |= RFCOMM_CONFIG_LOCALSIGNALSSENT;
+ RFCOMM_SendChannelSignals(RFCOMMChannel, BluetoothChannel);
+ }
+
+ /* If signals have been configured in both directions, progress to the open state */
+ if ((RFCOMMChannel->ConfigFlags & (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS)) ==
+ (RFCOMM_CONFIG_REMOTESIGNALS | RFCOMM_CONFIG_LOCALSIGNALS))
+ {
+ RFCOMMChannel->State = RFCOMM_Channel_Open;
+ }
+ }
+ }
+}
+
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)
}
}
+RFCOMM_Channel_t* RFCOMM_OpenChannel(Bluetooth_Channel_t* const BluetoothChannel)
+{
+ return NULL;
+}
+
+void RFCOMM_SendChannelSignals(const RFCOMM_Channel_t* const RFCOMMChannel, Bluetooth_Channel_t* const BluetoothChannel)
+{
+ BT_RFCOMM_DEBUG(1, ">> MSC Command");
+ BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", RFCOMMChannel->DLCI);
+
+ struct
+ {
+ RFCOMM_Command_t CommandHeader;
+ uint8_t Length;
+ RFCOMM_MSC_Parameters_t Params;
+ } MSCommand;
+
+ MSCommand.CommandHeader = (RFCOMM_Command_t){.Command = RFCOMM_Control_ModemStatus, .EA = true, .CR = true};
+ MSCommand.Length = (sizeof(MSCommand.Params) << 1) | 0x01;
+ MSCommand.Params.Channel = (RFCOMM_Address_t){.DLCI = RFCOMMChannel->DLCI, .EA = true, .CR = true};
+ MSCommand.Params.Signals = RFCOMMChannel->Local.Signals;
+ MSCommand.Params.BreakSignal = RFCOMMChannel->Local.BreakSignal;
+
+ /* Send the MSC command to the remote device */
+ RFCOMM_SendFrame(RFCOMM_CONTROL_DLCI, true, RFCOMM_Frame_UIH, sizeof(MSCommand), &MSCommand, BluetoothChannel);
+}
+
+RFCOMM_Channel_t* RFCOMM_GetFreeChannelEntry(const uint8_t DLCI)
+{
+ /* 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* RFCOMMChannel = &RFCOMM_Channels[i];
+
+ /* If the channel's state is closed, the channel state entry is free */
+ if (RFCOMMChannel->State == RFCOMM_Channel_Closed)
+ {
+ RFCOMMChannel->DLCI = DLCI;
+ RFCOMMChannel->State = RFCOMM_Channel_Configure;
+ RFCOMMChannel->Priority = 7 + (RFCOMMChannel->DLCI & 0xF8);
+ RFCOMMChannel->MTU = 0xFFFF;
+ RFCOMMChannel->Remote.Signals = 0 | (1 << 0);
+ RFCOMMChannel->Remote.BreakSignal = 0 | (1 << 0);
+ RFCOMMChannel->Local.Signals = RFCOMM_SIGNAL_RTC | RFCOMM_SIGNAL_RTR | RFCOMM_SIGNAL_DV | (1 << 0);
+ RFCOMMChannel->Local.BreakSignal = 0 | (1 << 0);
+ RFCOMMChannel->ConfigFlags = 0;
+
+ return RFCOMMChannel;
+ }
+ }
+
+ return NULL;
+}
+
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->State != RFCOMM_Channel_Closed) && (CurrRFCOMMChannel->DLCI == DLCI))
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);
}
/* Set the frame header values to the specified address and frame type */
ResponsePacket.FrameHeader.Control = Control;
- ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t)
- {
- .EA = true,
- .CR = CommandResponse,
- .DLCI = DLCI,
- };
+ ResponsePacket.FrameHeader.Address = (RFCOMM_Address_t){.DLCI = DLCI, .EA = true, .CR = CommandResponse};
/* Set the lower 7 bits of the packet length */
ResponsePacket.Size[0] = (DataLen << 1);
{
uint8_t FCS = 0xFF;
+ /* Calculate new Frame CRC value via the given data bytes and the CRC table */
for (uint8_t i = 0; i < Length; i++)
FCS = pgm_read_byte(&CRC8_Table[FCS ^ ((uint8_t*)FrameStart)[i]]);
/* If the requested channel is currently open, destroy it */
if (RFCOMMChannel != NULL)
- RFCOMMChannel->DLCI = 0x00;
+ RFCOMMChannel->State = RFCOMM_Channel_Closed;
BT_RFCOMM_DEBUG(1, ">> UA Sent");
RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
{
BT_RFCOMM_DEBUG(1, "<< SABM Received");
BT_RFCOMM_DEBUG(2, "-- DLCI 0x%02X", FrameAddress->DLCI);
-
- /* Find a free entry in the RFCOMM channel multiplexer state array */
- for (uint8_t i = 0; i < RFCOMM_MAX_OPEN_CHANNELS; i++)
+
+ if (FrameAddress->DLCI == RFCOMM_CONTROL_DLCI)
{
- 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->UseUIFrames = false;
- CurrRFCOMMChannel->RemoteMTU = 0xFFFF;
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
- BT_RFCOMM_DEBUG(1, ">> UA Sent");
- RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
- return;
- }
+ /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+
+ return;
}
- BT_RFCOMM_DEBUG(1, ">> DM Sent");
+ /* Find the existing channel's entry in the channel table */
+ RFCOMM_Channel_t* RFCOMMChannel = RFCOMM_GetChannelData(FrameAddress->DLCI);
+
+ /* Existing entry not found, create a new entry for the channel */
+ if (RFCOMMChannel == NULL)
+ RFCOMMChannel = RFCOMM_GetFreeChannelEntry(FrameAddress->DLCI);
+
+ /* If space was found in the channel table for the new channel, ACK the request */
+ if (RFCOMMChannel != NULL)
+ {
+ BT_RFCOMM_DEBUG(1, ">> UA Sent");
+
+ /* Free channel found, or request was to the control channel - accept SABM by sending a UA frame */
+ RFCOMM_SendFrame(FrameAddress->DLCI, true, (RFCOMM_Frame_UA | FRAME_POLL_FINAL), 0, NULL, Channel);
+ }
+ else
+ {
+ 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);
+ /* 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)
projects / pub / USBasp.git / blobdiff