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@ -28,6 +28,13 @@
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this software.
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this software.
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*/
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*/
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/** \file
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*
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* RFCOMM layer module. This module manages the RFCOMM layer of the
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* stack, providing virtual serial port channels on top of the lower
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* L2CAP layer.
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*/
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#define INCLUDE_FROM_RFCOMM_C
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#define INCLUDE_FROM_RFCOMM_C
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#include "RFCOMM.h"
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#include "RFCOMM.h"
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@ -62,10 +69,10 @@ void RFCOMM_Initialize(void)
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void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
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void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
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{
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{
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RFCOMM_Header_t* FrameHeader = (RFCOMM_Header_t*)Data;
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const RFCOMM_Header_t* FrameHeader = (const RFCOMM_Header_t*)Data;
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/* Decode the RFCOMM frame type from the header */
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/* Decode the RFCOMM frame type from the header */
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switch (FrameHeader->FrameType & ~FRAME_POLL_FINAL)
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switch (FrameHeader->Control & ~FRAME_POLL_FINAL)
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{
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{
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case RFCOMM_Frame_SABM:
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case RFCOMM_Frame_SABM:
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RFCOMM_ProcessSABM(FrameHeader, Channel);
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RFCOMM_ProcessSABM(FrameHeader, Channel);
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@ -82,54 +89,94 @@ void RFCOMM_ProcessPacket(void* Data, Bluetooth_Channel_t* const Channel)
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case RFCOMM_Frame_UIH:
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case RFCOMM_Frame_UIH:
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RFCOMM_ProcessUIH(FrameHeader, Channel);
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RFCOMM_ProcessUIH(FrameHeader, Channel);
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break;
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break;
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default:
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BT_RFCOMM_DEBUG(1, "<< Unknown Frame Type");
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break;
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}
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}
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}
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}
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static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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{
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{
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uint8_t* CurrBufferPos = ((uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
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uint16_t DataLen = RFCOMM_GetFrameDataLength(&CurrBufferPos);
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BT_RFCOMM_DEBUG(1, "<< SABM Received");
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BT_RFCOMM_DEBUG(1, "<< SABM Received");
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BT_RFCOMM_DEBUG(2, "-- Data Length 0x%04X", DataLen);
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BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
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// TODO: Reset channel send/receive state here
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struct
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{
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RFCOMM_Header_t FrameHeader;
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uint8_t FrameLength;
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uint8_t FCS;
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} ResponsePacket;
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/* Copy over the same frame header as the sent packet to copy the logical RFCOMM channel address */
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ResponsePacket.FrameHeader.Address = FrameHeader->Address;
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/* Set the frame type to an Unnumbered Acknowledgement to acknowledge the SABM request */
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ResponsePacket.FrameHeader.Control = RFCOMM_Frame_UA;
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/* Set the length to 0 (LSB indicates end of 8-bit length field) */
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ResponsePacket.FrameLength = 0x01;
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/* Calculate the frame checksum from all fields except the FCS field itself */
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ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket) - sizeof(ResponsePacket.FCS));
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for (uint16_t i = 0; i < DataLen; i++)
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BT_RFCOMM_DEBUG(1, ">> UA Sent");
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printf("0x%02X ", CurrBufferPos[i]);
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printf("\r\n");
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/* Send the completed response packet to the sender */
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Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
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}
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}
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static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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{
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{
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const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
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BT_RFCOMM_DEBUG(1, "<< UA Received");
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BT_RFCOMM_DEBUG(1, "<< UA Received");
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BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
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}
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}
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static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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static void RFCOMM_ProcessDM(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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{
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{
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const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
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BT_RFCOMM_DEBUG(1, "<< DM Received");
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BT_RFCOMM_DEBUG(1, "<< DM Received");
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BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
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}
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}
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static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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{
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{
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const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
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BT_RFCOMM_DEBUG(1, "<< DISC Received");
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BT_RFCOMM_DEBUG(1, "<< DISC Received");
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BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
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}
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}
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static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
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{
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{
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const uint8_t* CurrBufferPos = ((const uint8_t*)FrameHeader + sizeof(RFCOMM_Header_t));
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BT_RFCOMM_DEBUG(1, "<< UIH Received");
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BT_RFCOMM_DEBUG(1, "<< UIH Received");
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BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address);
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}
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}
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static uint16_t RFCOMM_GetFrameDataLength(void** BufferPos)
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static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length)
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{
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{
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uint8_t FirstOctet = *((uint8_t*)*BufferPos);
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const uint8_t* CurrPos = FrameStart;
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(*BufferPos)++;
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uint8_t FCS = 0xFF;
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while (Length--)
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FCS = pgm_read_byte(CRC8_Table[FCS ^ *(CurrPos++)]);
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return ~FCS;
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}
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static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos)
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{
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uint8_t FirstOctet = *((*BufferPos)++);
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uint8_t SecondOctet = 0;
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uint8_t SecondOctet = 0;
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if (!(FirstOctet & 0x01))
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if (!(FirstOctet & 0x01))
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{
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SecondOctet = *((*BufferPos)++);
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SecondOctet = *((uint8_t*)*BufferPos);
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(*BufferPos)++;
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}
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return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
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return (((uint16_t)SecondOctet << 7) | (FirstOctet >> 1));
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}
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}
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