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Enhance Fpy docs with state machine diagram (#4315)

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* Enhance documentation with state machine diagram

* sp
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@ -8,6 +8,98 @@ The FpySequencer is primarily composed of a state machine and a runtime environm
The FpySequencer runs files compiled by `fprime-fpyc` (in the `fprime-gds` package). See the compiler documentation for the details of the Fpy language. The FpySequencer runs files compiled by `fprime-fpyc` (in the `fprime-gds` package). See the compiler documentation for the details of the Fpy language.
## Requirements
TBD
## States
The following diagram represents the states of the `FpySequencer`.
```mermaid
stateDiagram-v2
direction LR
state "IDLE
entry / clearBreakpoint, clearSequenceFile
------------------------------------------------------
cmd_SET_BREAKPOINT / setBreakpoint
cmd_CLEAR_BREAKPOINT / clearBreakpoint
" as IDLE
state "VALIDATING
enter / report_seqStarted, validate
------------------------------------------------------
cmd_SET_BREAKPOINT / setBreakpoint
cmd_CLEAR_BREAKPOINT / clearBreakpoint
" as VALIDATING
state VALID <<choice>>
state "AWAITING_CMD_RUN_VALIDATED
enter / resp_OK
------------------------------------------------------
cmd_SET_BREAKPOINT / setBreakpoint
cmd_CLEAR_BREAKPOINT / clearBreakpoint
" as AWAITING_CMD_RUN_VALIDATED
state "RUNNING entry / resetRuntime
" as RUNNING {
state BREAK_CHECK <<choice>>
state "DISPATCH_STATEMENT
enter / dispatch
" as DISPATCH_STATEMENT
state "PAUSED
entry / clearBreakBeforeNextLine, if breakOnce: clearBreakpoint
-------------------------------------------------------------
" as PAUSED
[*] --> BREAK_CHECK
BREAK_CHECK --> PAUSED: if break
BREAK_CHECK --> DISPATCH_STATEMENT: if not break
PAUSED --> DISPATCH_STATEMENT: cmd_CONTINUE
PAUSED --> DISPATCH_STATEMENT: cmdSTEP/setBreakBeforeNextLine
DISPATCH_STATEMENT --> [*]: noMoreStatements/resp_OK
DISPATCH_STATEMENT --> [*]: failure/resp_EXECUTION_ERROR
DISPATCH_STATEMENT --> AWAITING_STATEMENT_RESPONSE: success
AWAITING_STATEMENT_RESPONSE --> [*]: failure/resp_EXECUTION_ERROR
AWAITING_STATEMENT_RESPONSE --> [*]: timeout
AWAITING_STATEMENT_RESPONSE --> SLEEPING: beginSleep
AWAITING_STATEMENT_RESPONSE --> BREAK_CHECK: success
SLEEPING --> [*]: timeout/resp_EXECUTION_ERROR
SLEEPING --> [*]: error/resp_EXECUTION_ERROR
SLEEPING --> BREAK_CHECK: shouldWake
}
IDLE --> VALIDATING: cmd_VALIDATE/setSequenceFilePath
IDLE --> VALIDATING: cmd_RUN/setSequenceFilePath
VALID --> RUNNING: if cmd_RUN
VALID --> AWAITING_CMD_RUN_VALIDATED: if cmd_VALIDATE
VALIDATING --> IDLE: failure/seqFailed,resp_EXECUTION_ERROR
VALIDATING --> VALID: success
VALIDATING --> IDLE: cmd_CANCEL/seqCancelled,resp_EXECUTION_ERROR
AWAITING_CMD_RUN_VALIDATED --> IDLE: cmd_CANCEL/seqCancelled
AWAITING_CMD_RUN_VALIDATED --> RUNNING: cmd_RUN_VALIDATED
RUNNING --> IDLE: failure
RUNNING --> IDLE: noMoreStatements
```
## Flags ## Flags
The FpySequencer supports certain boolean flags which control the behavior of the sequencer while running a sequence. The flags can be accessed and modified by the sequence itself, or by command while a sequence is running. When a sequence starts running, the flags are initialized to a value configured by the FLAG_DEFAULT_XYZ parameters. The FpySequencer supports certain boolean flags which control the behavior of the sequencer while running a sequence. The flags can be accessed and modified by the sequence itself, or by command while a sequence is running. When a sequence starts running, the flags are initialized to a value configured by the FLAG_DEFAULT_XYZ parameters.