State machine used inter character spacing behaving better now
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documentation/Morse_reception_state_diagram.tex
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70
documentation/Morse_reception_state_diagram.tex
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@ -0,0 +1,70 @@
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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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51
main.py
51
main.py
@ -14,6 +14,9 @@ rtc.setDate(16, 7, 2022)
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rtc.setTime(12, 10, 0)
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rate = 50 # 20 wpm
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# 0=IDLE 1=KEYDN 2=DIT 3=DAH 4=SPACE
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morse_state = 0
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#sec = 0
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#f = open(logFileName, 'a')
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#f.write("# Data Logging: Date, Time, Temperature, Pressure, Humidity, AirQuality, CO2\n")
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@ -41,7 +44,7 @@ def ButtonA_f_IRQHandler(pin):
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print (" IRQ button A" + str(rate))
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def ButtonB_f_IRQHandler(pin):
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global last_pv, last_tt, spurious, mindex
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global last_pv, last_tt, spurious, mindex, morse_state
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pv = pin.value()
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tt = time.ticks_ms()
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#print("button B IRQ", tt, pv)
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@ -51,7 +54,12 @@ def ButtonB_f_IRQHandler(pin):
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else:
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#b=buttonEvent(time.ticks_ms(),pv)
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d = tt - last_tt
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if pv:
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if pv: # MORSE BUTTON DOWN
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if ( morse_state == 4 ):
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if d > rate*7:
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printm(' ')
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#print(" duration of inter-m space ", d)
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if d < rate*3:
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print (" ")
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@ -60,14 +68,17 @@ def ButtonB_f_IRQHandler(pin):
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mindex += 1;
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beeper.playTone(600)
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button_state = 1
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else:
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morse_state = 1 # button down
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else: # MORSE BUTTON RELEASED
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#print(" duration of press ", d)
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if d > rate*3:
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morse.append("-");
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print ("DAH")
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#print ("DAH ms=", morse_state)
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morse_state = 3
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else:
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morse.append(".");
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print ("DIT")
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#print ("DIT ms=", morse_state)
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morse_state = 2
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beeper.stopTone()
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button_state = 0
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last_pv = pv
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@ -213,27 +224,17 @@ def decode_morse():
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return ("9")
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return("?")
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last_was_space = 0
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last_sp = 0
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def process_morse():
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global last_tt, morse, last_was_space, last_sp
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tt = time.ticks_ms()
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if (button_state == 0):
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if (tt - last_tt) > rate*6:
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# morse chacter complete
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if (len(morse) > 0):
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#print(morse)
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printm(decode_morse())
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morse = []
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last_was_space = 0
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last_sp = last_tt
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if (tt - last_sp) > rate*22 : # and last_not_space == 0:
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if last_was_space == 0:
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printm(" ");
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last_was_space = 1 # dont keep repeating inter word spaces
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last_sp = last_tt
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def process_morse():
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global last_tt, morse, morse_state
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tt = time.ticks_ms()
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if ( morse_state == 2 or morse_state == 3):
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if (tt - last_tt) > rate*3:
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# morse chacter complete
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printm(decode_morse())
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morse = [] # clear for next character to rxd
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morse_state = 4
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