Simple Introduction of IrDA Graf Yang

Simple Introduction of IrDA (1) ‏ Spec Speed(max rate) Year WindowSize(frames) FramesCounter(bits) SIR Kbit/s FIR 576 Kbit/s FIR Mbit/s FIR 4 Mbit/s VFIR 4 Mbit/s IrDA: Infrared Data Association SIR: Serial Infrared FIR: Fast Infrared VFIR: Very Fast Infrared BER: Bit Error Rate IrLAP: IrDA Link Access Protocol IrLMP: IrDA Link Management Protocol

Simple Introduction of IrDA (2) ‏ IrDA Transmit Pulse

Simple Introduction of IrDA (3) ‏

Simple Introduction of IrDA (4) ‏ IrLAP layer: IrLAP stations operate in two modes, in the Normal Disconnect Mode (NDM) during the contention period and in the Normal Response Mode (NRM) during the connection period. In the contention period, a station advertises its existence in the neighbour stations along with the link parameters it supports and wishes to employ during link establishment. One of the participating stations becomes the primary station. Any station may claim to become the primary station but, at the end of the contention period, only one station is assigned the primary role and all other stations are assigned the secondary role.

Simple Introduction of IrDA (5) ‏ NDM contention period occurs at 9.6 Kbit/s, negotiated following parameters: a) Data rate. The station’s transmission rate. must use the same data rate. b) Maximum turn around time. The maximum time interval a station can hold transmission control. For data rates less than Kbit/s maximum turn around time must be 500ms. c) Data size. Upper limit of 2,048 bytes (16Kbits). d) Window size. Upper limit of 7 for speeds up to 4Mbit/s and 127 for 4Mbit/s and 16Mbit/s. e) Minimum turn around time. The time required by the station’s receiver circuit to recover after the end of a transmission initiated from the same station.

Simple Introduction of IrDA (6) ‏ NRM Information transfer procedure:

Simple Introduction of IrDA (7) ‏ SIR driver operations: a. Driver probe: bfin_sir_probe()‏ b. Start driver: bfin_sir_open(), HW initialize c. Send packet: IrLAP->bfin_sir_hard_xmit()->bfin_sir_tx_int()‏ d. Receive char: bfin_sir_rx_int()->async_unwrap_char()‏ e. Stop driver: bfin_sir_stop(), shutdown HW f. Remove driver: bfin_sir_remove()‏

Simple Introduction of IrDA (8) ‏ NRM Information transfer procedure:

Simple Introduction of IrDA (9) ‏ Frame structure:

Simple Introduction of IrDA (10) ‏ Timing diagram of negotiation Vcore=500M, HZ=250, 1 Ticket = 4 mSecond

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