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Refactor out RFCOMM packet send code into a seperate function.

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This commit is contained in:
Dean Camera 2010-06-06 14:39:51 +00:00
parent 7aec6cba1a
commit 361e1ec1d8
2 changed files with 38 additions and 28 deletions
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56
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.c
View File

@ -102,29 +102,9 @@ static void RFCOMM_ProcessSABM(const RFCOMM_Header_t* const FrameHeader, Bluetoo
// TODO: Reset channel send/receive state here // TODO: Reset channel send/receive state here
struct
{
RFCOMM_Header_t FrameHeader;
uint8_t FrameLength;
uint8_t FCS;
} ResponsePacket;
/* Copy over the same frame header as the sent packet to copy the logical RFCOMM channel address */
ResponsePacket.FrameHeader.Address = FrameHeader->Address;
/* Set the frame type to an Unnumbered Acknowledgement to acknowledge the SABM request */
ResponsePacket.FrameHeader.Control = RFCOMM_Frame_UA;
/* Set the length to 0 (LSB indicates end of 8-bit length field) */
ResponsePacket.FrameLength = 0x01;
/* Calculate the frame checksum from all fields except the FCS field itself */
ResponsePacket.FCS = RFCOMM_GetFCSValue(&ResponsePacket, sizeof(ResponsePacket) - sizeof(ResponsePacket.FCS));
BT_RFCOMM_DEBUG(1, ">> UA Sent"); BT_RFCOMM_DEBUG(1, ">> UA Sent");
/* Send the completed response packet to the sender */ RFCOMM_SendFrame(FrameHeader->Address, RFCOMM_Frame_UA, 0, NULL, Channel);
Bluetooth_SendPacket(&ResponsePacket, sizeof(ResponsePacket), Channel);
} }
static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel) static void RFCOMM_ProcessUA(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel)
@ -159,6 +139,40 @@ static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetoot
BT_RFCOMM_DEBUG(2, "-- Address 0x%02X", FrameHeader->Address); 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)
{
struct
{
RFCOMM_Header_t FrameHeader;
uint8_t Size[1 + (DataLen >= 128)];
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;
/* Set the lower 7 bits of the packet length */
ResponsePacket.Size[0] = (DataLen << 1);
/* Terminate the size field if size is 7 bits or lower, otherwise set the upper 8 bits of the length */
if (DataLen < 128)
ResponsePacket.Size[0] |= 0x01;
else
ResponsePacket.Size[1] = (DataLen >> 7);
/* 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));
/* 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, uint16_t Length)
{ {
const uint8_t* CurrPos = FrameStart; const uint8_t* CurrPos = FrameStart;

10
Demos/Host/Incomplete/BluetoothHost/Lib/RFCOMM.h
View File

@ -68,13 +68,7 @@
/* Type Defines: */ /* Type Defines: */
typedef struct typedef struct
{ {
struct uint8_t Address;
{
unsigned char LogicalChannel : 6;
unsigned char PollResponse : 1;
unsigned char LastAddressOctet : 1;
} Address;
uint8_t Control; uint8_t Control;
} RFCOMM_Header_t; } RFCOMM_Header_t;
@ -89,6 +83,8 @@
static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); static void RFCOMM_ProcessDISC(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel);
static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel); static void RFCOMM_ProcessUIH(const RFCOMM_Header_t* const FrameHeader, Bluetooth_Channel_t* const Channel);
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);
static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length); static uint8_t RFCOMM_GetFCSValue(const void* FrameStart, uint16_t Length);
static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos); static uint16_t RFCOMM_GetFrameDataLength(const uint8_t** BufferPos);
#endif #endif