UMX FLIP Installation Guide download pdf (Page 43)

Chapter 4.

MAC Programming

Sora provides a utility library to program a Finite State Machine (FSM). An FSM is commonly

used in the MAC and other protocol implementations. For example, Figure 19 shows a simplified

MAC state-machine of 802.11 that contains three states: carrier sense, transmission (TX) and

reception (RX).

Figure 19. A simplified MAC state machine of 802.11.

4.1 State Machine declaration and

initialization

The SDR driver declares an FSM through SORA_BEGIN_DECLARE_FSM_STATES,

SORA_END_DECLARE_FSM_STATES, and SORA_DECLARE_STATE. After that, the SDR driver

should further declare an FSM type using SORA_DECLARE_FSM_TYPE. An FSM instance can

then be declared for this FSM type. Each state of an FSM is associated with a state handler. At

initialization, the SDR driver should assign these handers to an FSM instance using

SORA_FSM_ADD_HANDLER.

Carrier Sense

Channel Free

Tx Pending and

Channel Free

Power

Detected

Tx Done

Failed

Rx Done

Failed

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UMX FLIP Installation Guide Page 43