7 Frame Exchange Log

This section shows the frames exchanged in a connection between the IrCOMM2k driver for the PC and the MSP430 IrDA stack. This is only meant to be an example, and it shows communication with no errors. When a frame is similar to the previous frame, only the different fields are commented on. All the numbers are in hexadecimal format, unless noted otherwise.

NOTE

IrCOMM2k is a driver for Windows that makes possible to use the IrCOMM services in the Windows IrDA stack. It also enables the user to be able to use the Linux-IrDA stack ported to Windows, if so desired (see IrCOMM2k, Virtual Infrared COM Port for Windows 2000/XP).

(001 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 00

Address Field: FF, where the last bit is the C/R bit. When set, the C/R bit indicates a command frame. The previous seven bits, equal to 7F are the broadcast address.

Control Field: 3F, 001x1111b indicates an unnumbered type frame. 2F is the opcode for exchange station identification. Bit 4 is the Poll/Final bit, which, when set by the primary, indicates the frame is the final frame.

Format Identifier: 01 is a set value as defined in the IrLAP documentation.

Source Device Address: 2923BE84 is the address of the device sending the frame. Destination Device Address: FFFFFFFF is the broadcast address during discovery. Discovery Flags: 01. The last two bits indicate the amount of slots to be used during the

discovery, in this case six. Bit 2 is the conflict bit which is not set in this case. Slot Number: 00, marks the first discovery slot.

Version Number: 00, as specified in the IrLAP documentation.

(002 from MSP430) XID response: FE BF 01 AB CD 12 34 29 23 BE 84 01 00 00 82 04 00 20 4D 53 50 34 33 30 20

Destination Device Address: 2329BE84 is the address of the device for which the frame is intended.

Service Hint Bits: 8204. These bits are set according to the IrLMP documentation and in this case they are set to support PDA/Palmtop and IrCOMM.

Character Set: 00 indicates ASCII is used.

Device Nickname: 204D535034333220 reads MSP430 and is the name that stores this device information in the peer device IAS database.

(003 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 01

(004 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 02

(005 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 03

(006 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 04

(007 from IrCOMM2k) XID command: FF 3F 01 29 23 BE 84 FF FF FF FF 01 FF 00 84 04 00 4C 54 41 30 38 36 36 32 36 35

Slot Number: FF marks the final discovery slot in the discovery sequence.

Service Hint Bits: 8404. This device supports PCs, PDA/Palmtops, and IrCOMM.

(008 from IrCOMM2k) SNRM command: FF 93 29 23 BE 84 AB CD 12 34 70 01 01 3E 82 01 01 83 01 3F 84 01 7F 85 01 80 86 01 1F 08 01 07

Control Field: 93, 100x0011_b = Unnumbered: Set Normal Response Mode (83) with the final bit set

Connection Address: 38 this corresponds to the middle six bits of 70.

Negotiation Parameters:

• Baud Rate: (01, 01, 3E) 9600, 19200, 38400, 57600, and 115200 bps supported
• Maximum Turnaround Time: (82, 01, 01) 500 ms
• Data Size: (83, 01, 3F) 64, 128, 256, 512, 1024, and 2048 bytes
• Window Size: (84, 01, 7F) 1, 2, 3, 4, 5, 6, and 7 frame windows
• Additional BOFs: (85, 01, 80) 0 additional BOFs at 115200 bps
• Minimum Turnaround Time: (86, 01, 1F) 10, 5, 1, 0.5, and 0.1 ms
• Link Disconnect/Threshold Time: (08, 01, 07) 3/0, 8/3, and 12/3 seconds

(009 from MSP430) UA Response: 70 73 AB CD 12 34 23 29 BE 84 01 01 02 82 01 01 83 01 01 84 01 01 85 01 01 86 01 01 08 01 01

Address Field: 70. Bit 0 is the C/R bit indicating a response, and the upper 7 bits use from now on the 'Connection Address' received in the SNRM frame number 38.

Control Field: 73, 011x0011b = Unnumbered: Unnumbered Acknowledgement (63) with the poll bit set.

(010 from IrCOMM2k) RR command: 71 11

Address Field: 71 with the C/R bit set and the CA (connection address) set to 38.

Control Field: 11 where bits 0-3 indicate a supervisory frame with a receive ready opcode, bit 4 is the P/F bit, and bits 5-7 indicate the received frame count (Nr).

(011 from MSP430) RR response: 70 11

(012 from IrCOMM2k) IrLMP Connect Command: 71 10 80 5A 01 00

Control Field: 10 where bit 0 indicates an information type frame, bits 1-3 indicate the sent frame count (Ns), bit 4 is the P/F bit, and bits 5-7 indicate the received frame count.

Destination: 80 where bit 7 is the control bit, and bits 0-6 are the DLSAP.

Source: 5A where bit 7 is reserved, and bits 0-6 are the SLSAP.

Opcode: 01 this corresponds to the connect command.

Reserved: 00 for future use.

(013 from MSP430) IrLMP Connect Confirm: 70 30 DA 00 81 00

Opcode: 81 corresponds to the connect confirm.

(014 from IrCOMM2k) IAS query: 71 32 00 5A 84 0B 49 72 44 41 3A 49 72 43 4F 4D 4D 0A 50 61 72 61 6D 65 74 65 72 73

IAP Control Field: 84 where bit 7 corresponds to the last frame bit, bit 6 is the acknowledge bit, and bits 0-5 are the opcode to the GetValueByClass IAS query.

Class Name: 0B497244413A4972434F4D4D where the first byte represents the length of the class name, and the rest is the ASCII hex for the class name: "IrDA:IrCOMM"

Attribute Name: 0A506172616D6574657273 where the first byte represents the length of the attribute, name and the rest is the ASCII hex for the attribute name: "Parameters".

(015 from MSP430) IAS result: 70 52 5A 00 84 00 00 01 00 01 02 00 03 00 01 07

IAP Control Field: 84 where bit 7 corresponds to the last frame bit, bit 6 is the acknowledge bit, and bits 0-5 are the opcode to the GetValueByClass IAS response.

Return: 00, success

List Length: 01

Object Identifier: 0001

Type: 02 for octet sequence

Sequence Length: 03

Sequence: 000107, where the first byte means service type, second byte is the length of result, and the last byte has bits set for: 3-wire raw, 3-wire, or 9-wire service.

(016 from IrCOMM2k) IrLMP Disconnect: 71 54 80 5A 02 01

IrLMP opcode: 02

Reason: 01 meaning user request.

(017 from MSP430) RR response: 70 71

(018 from IrCOMM2k) IrLMP Connect Command: 71 56 80 5B 01 00

(019 from MSP430) IrLMP Connect Confirm: 70 94 DB 00 81 00

(020 from IrCOMM2k) IAS query: 71 78 00 5B 84 0B 49 72 44 41 3A 49 72 43 4F 4D 4D 13 49 72 44 41 3A 54 69 6E 79 54 50 3A 4C 73 61 70 53 65 6C

IAP Control Field: 84 where bit 7 corresponds to the last frame bit, bit 6 is the acknowledge bit, and bits 0-5 are the opcode to the GetValueByClass IAS query.

Class Name: 0B497244413A4972434F4D4D where the first byte represents the length of the class name, and the rest is the ASCII hex for the class name: "IrDA:IrCOMM".

Attribute Name: 13497244413A54696E7954503A4C73617053656C where the first byte represents the length of the attribute name, and the rest is the ASCII hex for the attribute name: "IrDA:TinyTP:LsapSel".

(021 from MSP430) IAS result: 70 B6 5B 00 84 00 00 01 00 01 01 00 00 00 02

Type: 01 indicating an integer result.

Value: 000002 indicating the LSAP to use for TTP.

(022 from IrCOMM2k) IrLMP Disconnect: 71 9A 80 5B 02 01

(023 from MSP430) RR response: 70 D1

(024 from IrCOMM2k) IrLMP/TTP Connect Command: 71 9C 82 55 01 00 10

TTP Connect Frame: 10 where bit 7 is the P bit indicating a parameter-less connection frame, and where the remaining 7 bits indicate the Initial Credit given to the peer entity.

(025 from MSP430) IrLMP/TTP Connect Confirm: 70 F8 D5 02 81 00 01

(026 from IrCOMM2k) RR command: 71 B1

(027 from MSP430) RR response: 70 F1

(028 from IrCOMM2k) IrCOMM Parameter Set: 71 BE 02 55 00 12 00 01 04 10 04 00 00 25 80 11 01 03 12 01 0C 20 01 0C

IrCOMM header: 00

Length of Parameters: 12

Service Type: (00, 01 04) Service selected, equal to highest service in common, 9-wire

Data Rate: (10, 04, 00002580) 9600 bps

Data Format: (11, 01, 03) 8 bits, 1 stop bit, no parity

Flow Control: (12, 01, 0C) RTS/CTS on input and output

DTE Line Settings and Changes: (20, 01, 0C) DTR and RTS state

(029 from MSP430) IrCOMM Parameter Accept and TTP credit: 70 1A 55 02 02

TTP Credit: 02, where bit 7 is the M (more) bit, and the remaining six bits indicate the delta credit

(030 from IrCOMM2k) RR command: 71 D1

(031 from MSP430) RR response: 70 11

NOTE

The RR command and response and exchange continue (frames 32-37) until a device starts sending.

(038 from IrCOMM2k) IrLMP PDU/IrCOMM: 71 D0 02 55 00 00 74

IrCOMM data header: 0000

User Data: 74, the hex value for the ASCII character t

(039 from MSP430) IrLMP PDU/IrCOMM: 70 3C 55 02 00 00 38 37 46 20

IrCOMM data header: 0000

User Data: 38374620, the hex sequence for the ASCII string 87F

(040 from IrCOMM2k) RR command: 71 F1

(041 from MSP430) TTP advancing credit: 70 3E 55 02 02

TTP Credit: 02, where bit 7 is the M (more) bit, and the remaining six bits indicate the delta credit.

The exchange of RR command/response frames, IrCOMM user data and TTP credit continues until one of the peers requests disconnection after finishing the data transfer.