71 lines
2.1 KiB
TeX
71 lines
2.1 KiB
TeX
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\documentclass{article}
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% Language setting
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% Replace `english' with e.g. `spanish' to change the document language
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\usepackage[english]{babel}
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% Set page size and margins
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% Replace `letterpaper' with `a4paper' for UK/EU standard size
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\usepackage[letterpaper,top=2cm,bottom=2cm,left=3cm,right=3cm,marginparwidth=1.75cm]{geometry}
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% Useful packages
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\usepackage{amsmath}
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\usepackage{graphicx}
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\usepackage[colorlinks=true, allcolors=blue]{hyperref}
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\usepackage{tikz}
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\usetikzlibrary{automata, positioning, arrows}
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\title{Morse reception state machine}
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\author{R.P. Clark}
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\begin{document}
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\maketitle
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\begin{abstract}
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Your abstract.
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\end{abstract}
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\section{Introduction}
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State machine for morse rt decoding.
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\begin{itemize}
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\item 0: IDLE --- start state
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\item 1: KEY\_DN --- Morse KEY is DOWN
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\item 2: DIT --- Morse DIT element registered
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\item 3: DAH --- Morse DAH element registered
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\item 4: END\_CHAR --- One morse character registered i.e. (A-Z0-9)
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\item 5: SPACE --- One SPACE between characters registered
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\end{itemize}
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The relationships between these states is shown in figure~\ref{fig:morse_rt_reception},
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the time $\tau$ is 50mS for 20 characters per minute Morse code.
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\begin{figure}
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\centering
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\begin{tikzpicture}
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\node[state, initial] (q0) at (2,12) {0:IDLE};
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\node[state] (q1) at (4,9) {1:KEY\_DN};
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\node[state, accepting] at (10,6) (q2) {2:DIT};
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\node[state, accepting] at (8,6) (q3) {3:DAH};
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\node[state, accepting] at (4,3) (q4) {4:END\_CHAR};
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\node[state, accepting] at (2,0) (q5) {5:SPACE};
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\draw (q0) edge[->>,right] node{key down} (q1)
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(q1) edge[->>,right] node{KEY\_UP $\tau \approx 1$} (q2)
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(q1) edge[->>,left] node{KEY\_UP $\tau \approx 3$} (q3)
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(q2) edge[->>,right] node{$\tau \approx 3$} (q4)
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(q3) edge[->>,left] node{$\tau \approx 3$} (q4)
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(q4) edge[->>,left] node{$\tau > 4$} (q5)
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(q5) edge[->>,right, bend left, left=4.3] node{key down} (q1)
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(q4) edge[->>,left, bend left, left=4.3] node{key down} (q1)
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;
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\end{tikzpicture}
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\caption{State diagram for morse real time reception}
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\label{fig:morse_rt_reception}
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\end{figure}
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%\bibliographystyle{alpha}
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%\bibliography{sample}
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\end{document}
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