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This code is the latest as of 19-06-2013. It is an AudioScope designed around a Macbook Pro 13" of which only has ONE microphone input. It works under Linux variants too. Read the code for much more info.

It was my way of learning Bash scripting.

It is resident here at this site:-

http://www.unix.com/shell-programming-scripting/212939-start-simple-audio-scope-shell-script.html

It started off as a fun idea and is now becoming a very serious project.

As it stands this is fully working but it is uncalibrated and this is where it will stay on this site.

As the above site is the host then all future uploads will be there...

To do list...

DC input. [1] DC polarity. [1] 2 more Internal sync modes. External triggering. Zoom facility - if possible in text mode. Vertical calibration. [2] Frequency measurement. {3] (Others.)

[1] I have simple HW built as an idea but yet to prove it... [2] Preliminary HW built but not yet used. Calibration SW and circuit(s) to be built into script as it progresses. [3] I already have a working script but not completely satisfied at it at this point...

I am noing to say much else except that it has already been given a 5 star rating on the above UNIX site...

As it stands this code is entirely Public Domian and you may do with it as you please...

Enjoy something completely different using Bash scripting...

Finally the code defaults to a DEMO mode which requires no HW access at all but everything is still functional...

__Thoroughly__ read the code for more information...

As a circuit is inside the script then it is best viewed in plan text mode.

Bazza, G0LCU.

Bash, 939 lines
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#!/bin/bash
#
# AudioScope.sh
#
# At this point I will include and say thank you to "Corona688", a member of http://www.unix.com for his input...
# Also to others on the same site for their input too.
# Many thanks also go to the guys who have helped with this on http://www.linuxformat.com for all your input too...
#
# Tested in SOX mode on this Macbook Pro 13 inch, OSX 10.7.5 with the SOX sinewave generator enabled.
# Tested in /dev/dsp mode on an aging HP notebook running Debian 6.0.x with the /dev/dsp sinewave generator enabled.
# Tested in /dev/dsp mode on an Acer Aspire One netbook booting from a USB stick running PCLinuxOS 2009; also with
# the /dev/dsp sinewave generator enabled.
# Tested on all three in DEMO mode.
#
# Added the first simple circuit at the end of this script.
#
# Relevant pointers to help:-
# http://wisecracker.host22.com/public/AudioScope_Manual.readme
# http://wisecracker.host22.com/public/cal_draw.jpg
# http://wisecracker.host22.com/public/cal_plot.jpg
# http://wisecracker.host22.com/public/mic_ear1.jpg
# http://wisecracker.host22.com/public/mic_ear2.jpg
# http://wisecracker.host22.com/public/mic_ear3.jpg
# http://wisecracker.host22.com/public/mic_ear4.jpg
#
# The latest vesrion will always be here:-
# http://www.unix.com/shell-programming-scripting/212939-start-simple-audio-scope-shell-script.html
#
# NOTE TO SELF:- Remove "/tmp" and replace with "~" when ready, AND, "/tmp" is automatically cleared on this machine per reboot.

# #########################################################
# FOR SOund eXchance USERS ONLY!!!        TESTED!!!
# The lines below, from ">" to "xterm", will generate a new shell script and execute it in a new xterm terminal...
# Just EDIT out the comments and then EDIT the line pointing to the correct </full/path/to/sox/> to use it.
# It assumes that you have SoX installed. When this script is run it generates a 1KHz sinewave in a separate window
# that lasts for 8 seconds. Just press ENTER when this window is active and it will repeat again. To quit this script
# and close the window just press Ctrl-C. This generator will be needed for the calibration of some timebase ranges. 
#> /tmp/1KHz-Test.sh
#chmod 744 /tmp/1KHz-Test.sh
#printf '#!/bin/bash\n' >> /tmp/1KHz-Test.sh
#printf '> /tmp/sinewave.raw\n' >> /tmp/1KHz-Test.sh
#printf 'data="\\\\x80\\\\x26\\\\x00\\\\x26\\\\x7F\\\\xD9\\\\xFF\\\\xD9"\n' >> /tmp/1KHz-Test.sh
#printf 'for waveform in {0..8191}\n' >> /tmp/1KHz-Test.sh
#printf 'do\n' >> /tmp/1KHz-Test.sh
#printf '        printf "$data" >> /tmp/sinewave.raw\n' >> /tmp/1KHz-Test.sh
#printf 'done\n' >> /tmp/1KHz-Test.sh
#printf 'while true\n' >> /tmp/1KHz-Test.sh
#printf 'do\n' >> /tmp/1KHz-Test.sh
#printf '        /full/path/to/sox/play -b 8 -r 8000 -e unsigned-integer /tmp/sinewave.raw\n' >> /tmp/1KHz-Test.sh
#printf '        read -p "Press ENTER to rerun OR Ctrl-C to quit:- " -e kbinput\n' >> /tmp/1KHz-Test.sh
#printf 'done\n' >> /tmp/1KHz-Test.sh
#sleep 1
#xterm -e /tmp/1KHz-Test.sh &

# #########################################################
# FOR /dev/dsp USERS ONLY!!!           TESTED!!!
# The lines below, from ">" to "xterm", will generate a new shell script and execute it in a new xterm terminal...
# Just EDIT out the comments to use it.
# It assumes that you have /dev/dsp _installed_. When this script is run it generates a 1KHz sinewave in a separate window
# that lasts for 8 seconds. Just press ENTER when this window is active and it will repeat again. To quit this script
# and close the window just press Ctrl-C. This generator will be needed for the calibration of some timebase ranges. 
#> /tmp/1KHz-Test.sh
#chmod 744 /tmp/1KHz-Test.sh
#printf '#!/bin/bash\n' >> /tmp/1KHz-Test.sh
#printf '> /tmp/sinewave.raw\n' >> /tmp/1KHz-Test.sh
#printf 'data="\\\\x80\\\\x26\\\\x00\\\\x26\\\\x7F\\\\xD9\\\\xFF\\\\xD9"\n' >> /tmp/1KHz-Test.sh
#printf 'for waveform in {0..8191}\n' >> /tmp/1KHz-Test.sh
#printf 'do\n' >> /tmp/1KHz-Test.sh
#printf '        printf "$data" >> /tmp/sinewave.raw\n' >> /tmp/1KHz-Test.sh
#printf 'done\n' >> /tmp/1KHz-Test.sh
#printf 'while true\n' >> /tmp/1KHz-Test.sh
#printf 'do\n' >> /tmp/1KHz-Test.sh
#printf '        cat /tmp/sinewave.raw > /dev/dsp\n' >> /tmp/1KHz-Test.sh
#printf '        read -p "Press ENTER to rerun OR Ctrl-C to quit:- " -e kbinput\n' >> /tmp/1KHz-Test.sh
#printf 'done\n' >> /tmp/1KHz-Test.sh
#sleep 1
#xterm -e /tmp/1KHz-Test.sh &

# #########################################################
# Variables in use.
ifs_str=$IFS
version="           \$VER: AudioScope.sh_Version_0.00.70_PD_B.Walker_G0LCU.           "
setup=" Please wait while the very first scan and configuration file is generated. "
# Default first time run capture mode, 0 = DEMO.
demo=0
# Draw proceedure mode, 0 = OFF
drawline=0
# Pseudo-continuous data file saving.
savefile="0000000000"
save_string="OFF"
# "hold" and "status" will always be reset to "1" on program exit.
hold=1
status=1
# "count", "number" and "char" are reusable variables...
count=0
number=0
char="?"
# Vertical components...
# vert_one and vert_two are the vertical plotting points for the draw() function...
vert_one=2
vert_two=2
vert=12
vert_shift=2
vshift="?"
vert_array=""
vert_draw=9
# Display setup...
graticule="Public Domain, 2013, B.Walker, G0LCU."
# Keyboard components...
kbinput="?"
tbinput=1
# "str_len" is a reusable variable IF required...
str_len=1
# "grab" is used for internal pseudo-synchronisation...
grab=0
# "zero_offset" can only be manually changed in the AudioScope.config file, OR, here...
zero_offset=-2
# Horizontal components...
horiz=9
# Scan retraces...
scan=1
scanloops=1
# Timebase variable components...
subscript=0
# "scan_start" is from 0 to ( length of file - 64 )...
scan_start=0
# "scan_jump" is from 1 to ( ( ( scan_end - scan_start ) / 64) + 1 )...
scan_jump=1
# "scan_end" is at least 64 bytes in from the absolute file end...
scan_end=47935
# Synchronisation variables...
# synchronise switches the syncchroisation ON or OFF...
synchronise="OFF"
# sync_point is any value between 15 and 240 of the REAL grab(s)...
sync_point=128
sync_input="?"

# #########################################################
# Add the program tilte to the Terminal title bar...
# This may NOT work in every Terminal so just comment it out if it doesn't.
printf "\x1B]0;Shell AudioScope.\x07"

# #########################################################
# Generate a config file and temporarily store inside /tmp
if [ -f /tmp/AudioScope.config ]
then
	. /tmp/AudioScope.config
else
	user_config
fi
user_config()
{
	> /tmp/AudioScope.config
	chmod 644 /tmp/AudioScope.config
	printf "demo=$demo\n" >> /tmp/AudioScope.config
	printf "drawline=$drawline\n" >> /tmp/AudioScope.config
	printf "hold=1\n" >> /tmp/AudioScope.config
	printf "status=1\n" >> /tmp/AudioScope.config
	printf "zero_offset=$zero_offset\n" >> /tmp/AudioScope.config
	printf "scanloops=$scanloops\n" >> /tmp/AudioScope.config
	printf "scan_start=$scan_start\n" >> /tmp/AudioScope.config
	printf "scan_jump=$scan_jump\n" >> /tmp/AudioScope.config
	printf "scan_end=$scan_end\n" >> /tmp/AudioScope.config
	printf "vert_shift=$vert_shift\n" >> /tmp/AudioScope.config
	printf "setup='$setup'\n" >> /tmp/AudioScope.config
	printf "save_string='$save_string'\n" >> /tmp/AudioScope.config
}

# #########################################################
# Screen display setup function.
display()
{
	# Set foregound and background graticule colours and foreground and background other window colours.
	printf "\x1B[0;36;44m"
	clear
	graticule="       +-------+-------+-------+---[\x1B[0;37;44mDISPLAY\x1B[0;36;44m]---+-------+-------+--------+       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       +-------+-------+-------+-------+-------+-------+-------+--------+ <     \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"     0 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+--+ <     \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       +-------+-------+-------+-------+-------+-------+-------+--------+ <     \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       |       |       |       |       +       |       |       |        |       \n"
	graticule=$graticule"       +-------+-------+-------+-------+-------+-------+-------+--------+       \n"
	graticule=$graticule" \x1B[0;37;40m+-----------------------------[COMMAND  WINDOW]------------------------------+\x1B[0;37;44m \n"
	graticule=$graticule" \x1B[0;37;40m| COMMAND:-                                                                  |\x1B[0;37;44m \n"
	graticule=$graticule" \x1B[0;37;40m+------------------------------[STATUS WINDOW]-------------------------------+\x1B[0;37;44m \n"
	graticule=$graticule" \x1B[0;37;40m| Stopped...                                                                 |\x1B[0;37;44m \n"
	graticule=$graticule" \x1B[0;37;40m|$setup|\x1B[0;37;44m \n"
	graticule=$graticule" \x1B[0;37;40m+----------------------------------------------------------------------------+\x1B[0;37;44m "  
	printf "$graticule"
	# Set the colours for plotting.
	printf "\x1B[1;37;44m"
}

# #########################################################
# Pick which method to capture, (and store), the waveform on the fly.
waveform()
{
	> /tmp/waveform.raw
	chmod 644 /tmp/waveform.raw
	# Demo mode, generate 48000 bytes of random data.
	if [ $demo -eq 0 ]
	then
		# Use "sleep" to simulate a 1 second burst.
		sleep 1
		# "/dev/urandom is now used instead of RANDOM as it is MUCH faster.
		dd if=/dev/urandom of=/tmp/waveform.raw bs=48000 count=1
	fi
	# Using the aging(/old) /dev/dsp device, mono, 8 bits per sample and 8KHz sampling rate, 8000 unsigned-integer bytes of data...
	# Now tested on PCLinuxOS 2009 and Debian 6.0.x.
	if [ $demo -eq 1 ]
	then
		# This uses the oss-compat installation from your distro's repository...
		dd if=/dev/dsp of=/tmp/waveform.raw bs=8000 count=1
	fi
	# The main means of obtaining the unsigned-integer data, using SoX, (Sound eXcahnge) from http://sox.sourceforge.net ...
	if [ $demo -eq 2 ]
	then
		# Change the absolute address for your location of "sox"...
		/Users/barrywalker/Downloads/sox-14.4.0/sox -q -V0 -d -t raw -r 48000 -b 8 -c 1 -e unsigned-integer -> /tmp/waveform.raw trim 0 00:01
	fi
}

# #########################################################
# Plot the points inside the window...
plot()
{
	subscript=$scan_start
	vert_array=""
	for horiz in {9..72}
	do
		vert=`hexdump -n1 -s$subscript -v -e '1/1 "%u"' /tmp/waveform.raw`
		# Add a small offset to give a straight line with zero input allowing for mid-point sound card bit error.
		vert=$[ ( $vert + $zero_offset ) ]
		if [ $vert -le 0 ]
		then
			vert=0
		fi
		if [ $vert -ge 255 ]
		then
			vert=255
		fi
		# Pseudo-vertical shift of + or - 1 vertical division maximum.
		vert=$[ ( ( $vert / 16 ) + $vert_shift ) ]
		# Ensure the plot is NOT out of bounds after moving the shift position.
		if [ $vert -le 2 ]
		then
			vert=2
		fi
		if [ $vert -ge 17 ]
		then
			vert=17
		fi
		subscript=$[ ( $subscript + $scan_jump ) ]
		# Generate a smple space delimited 64 sample array.
		vert_array="$vert_array$vert "
		printf "\x1B[1;37;44m\x1B["$vert";"$horiz"f*"
	done
	# Set end of plot to COMMAND window.
	printf "\x1B[0;37;40m\x1B[20;14f"
}

# #########################################################
# This function connects up the plotted points.
# Defaults to OFF on the very first time run and must be manually enabled if needed.
draw()
{
	statusline
	IFS=" "
	subscript=0
	number=0
	vert_one=2
	vert_two=2
	vert_draw=( $vert_array )
	for horiz in {9..71}
	do
		# Obtain the two vertical components.
		vert_one=${vert_draw[ $subscript ]}
		subscript=$[ ( $subscript + 1 ) ]
		vert_two=${vert_draw[ $subscript ]}
		# Now subtract them and obtain an absolute value - ALWAYS 0 to positive...
		number=$[ ( $vert_two - $vert_one ) ]
		number=${number#-}
		# This decision section _is_ needed.
		if [ $number -le 1 ]
		then
			: # NOP. Do nothing...
		fi
		# This section does the drawing...
		if [ $number -ge 2 ]
		then
			if [ $vert_one -gt $vert_two ]
			then
				vert_one=$[ ( $vert_one - 1 ) ]
				while [ $vert_one -gt $vert_two ]
				do
					printf "\x1B[1;37;44m\x1B["$vert_one";"$horiz"f*"
					vert_one=$[ $vert_one - 1 ]
				done
			fi
			if [ $vert_two -gt $vert_one ]
			then
				vert_one=$[ ( $vert_one + 1 ) ]
				while [ $vert_one -lt $vert_two ]
				do
					printf "\x1B[1;37;44m\x1B["$vert_one";"$horiz"f*"
					vert_one=$[ $vert_one + 1 ]
				done
			fi

		fi
	IFS=$ifs_str
	done
	# Set end of plot to COMMAND window.
	printf "\x1B[0;37;40m\x1B[20;14f"
}

# #########################################################
# This is the information line _parser_...
statusline()
{
	printf "\x1B[0;37;40m\x1B[22;3f                                                                            \x1B[22;4f"
	if [ $status -eq 0 ]
	then
		printf "Stopped..."
	fi
	if [ $status -eq 1 ]
	then
		printf "Running $scan of $scanloops scans..."
	fi
	if [ $status -eq 2 ]
	then
		printf "Running in single shot storage mode..."
	fi
	if [ $status -eq 3 ]
	then
		printf "Drawing the scan..."
	fi
	if [ $status -eq 4 ]
	then
		printf "Synchroniastion set to $sync_point$synchronise..."
	fi
	if [ $status -eq 5 ]
	then
		printf "CAUTION, AUTO-SAVING FACILITY ENABLED!!!"
	fi
	if [ $status -eq 254 ]
	then
		status=1
		setup=$version
		printf "\x1B[23;3f$setup"
	fi
	# Set end of plot to COMMAND window.
	printf "\x1B[0;37;40m\x1B[20;14f"
}

# #########################################################
# All keyboard commands appear here when the scanning stops; there will be lots of them to make subtle changes...
kbcommands()
{
	IFS=$ifs_str
	status=1
	scan=1
	read -p "Press <CR> to (re)run, HELP or QUIT<CR> " -e kbinput
	printf "\x1B[0;37;40m\x1B[20;14f                                                                 "
	# Rerun scans captured or stored.
	if [ "$kbinput" == "" ]
	then
		status=1
		statusline
	fi
	# Run scans in captured, (REAL scan), mode only.
	if [ "$kbinput" == "RUN" ]
	then
		status=1
		hold=1
		statusline
	fi
	# Swtich off capture mode and rerun one storage shot only, this disables the DRAW command.
	# Use DRAW to re-enable again. This is deliberate for slow machines...
	if [ "$kbinput" == "HOLD" ]
	then
		drawline=0
		status=2
		hold=0
		scanloops=1
		statusline
		sleep 1
	fi
	# Quit the program.
	if [ "$kbinput" == "QUIT" ]
	then
		status=255
		break
	fi
	# Display the _online_ HELP file in default terminal colours.
	if [ "$kbinput" == "HELP" ]
	then
		status=0
		scanloops=1
		hold=0
		commandhelp
	fi
	# Enable DEMO pseudo-capture mode, default, but with 10 sweeps...
	if [ "$kbinput" == "DEMO" ]
	then
		status=1
		scan_start=0
		scan_jump=1
		scanloops=10
		scan_end=47935
		demo=0
		hold=1
		statusline
		sleep 1
	fi
	# Enable /dev/dsp capture mode, if your Linux flavour does NOT have it, install oss-compat from the distro's repository.
	# This is the mode used to test on Debian 6.0.x and now PCLinuxOS 2009...
	if [ "$kbinput" == "DSP" ]
	then
		status=1
		scan_start=0
		scan_jump=1
		scanloops=1
		scan_end=7935
		hold=1
		demo=1
		statusline
		sleep 1
	fi
	# Eable SOX capture mode, this code is designed around this application on a Macbook Pro 13 inch OSX 10.7.5...
	if [ "$kbinput" == "SOX" ]
	then
		status=1
		scan_start=0
		scan_jump=1
		scanloops=1
		scan_end=47935
		hold=1
		demo=2
		statusline
		sleep 1
	fi
	# The next three commands set the timebase scans; 1, 10 or 100 before COMMAND mode is re-enabled and can be used.
	if [ "$kbinput" == "ONE" ]
	then
		status=1
		scanloops=1
		hold=1
	fi
	if [ "$kbinput" == "TEN" ]
	then
		status=1
		scanloops=10
		hold=1
	fi
	if [ "$kbinput" == "HUNDRED" ]
	then
		status=1
		scanloops=100
		hold=1
	fi
	if [ "$kbinput" == "VER" ]
	then
		status=254
	fi
	# ************ Horizontal components. *************
	# ************ User timebase section. *************
	# Written longhand for kids to understand.
	if [ "$kbinput" == "TBVAR" ]
	then
		# Ensure capture mode is turned off.
		# RUN<CR> will re-enable it if required.
		scanloops=1
		status=1
		hold=0
		printf "\x1B[0;37;40m\x1B[20;14f"
		read -p "Set timebase starting point. From 0 to $scan_end<CR> " -e tbinput
		printf "\x1B[0;37;40m\x1B[20;14f                                                                 \x1B[0;37;40m\x1B[20;14f"
		# Ensure the timebase values are set to default before changing.
		scan_start=0
		scan_jump=1
		# Eliminate any keyboard error longhand...
		# Ensure a NULL string does NOT exist.
		if [ "$tbinput" == "" ]
		then
			scan_start=0
			tbinput=0
		fi
		# Find the length of the inputted string.
		str_len=`printf "${#tbinput}"`
		# Set the string to the correct last position for the _subscript_ point.
		str_len=$[ ( $str_len - 1 ) ]
		# Now check for continuous numerical charaters ONLY.
		for count in $( seq 0 $str_len )
		do
			# Reuse variable _number_ to obtain each character per loop.
			number=`printf "${tbinput:$count:1}"`
			# Now convert the character to a decimal number.
			number=`printf "%d" \'$number`
			# IF ANY ASCII character exists that is not numerical then reset the scan start point.
			if [ $number -le 47 ]
			then
				scan_start=0
				tbinput=0
			fi
			if [ $number -ge 58 ]
			then
				scan_start=0
				tbinput=0
			fi
		done
		# If all is OK pass the "tbinput" value into the "scan_start" variable.
		scan_start=$tbinput
		# Do a final check that the number is not out of bounds.
		if [ $scan_start -le 0 ]
		then
			scan_start=0
		fi
		if [ $scan_start -ge $scan_end ]
		then
			scan_start=$scan_end
		fi
		# Use exactly the same method as above to determine the jump interval.
		# Now set the jump interval, this is the scan speed...
		printf "\x1B[0;37;40m\x1B[20;14f"
		read -p "Set timebase user speed. From 1 to $[ ( ( ( ( $scan_end - $scan_start ) / 64 ) + 1 ) ) ]<CR> " -e tbinput
		printf "\x1B[0;37;40m\x1B[20;14f                                                                 \x1B[0;37;40m\x1B[20;14f"
		# Eliminate any keyboard error longhand...
		# Ensure a NULL string does NOT exist.
		if [ "$tbinput" == "" ]
		then
			scan_jump=1
			tbinput=1
		fi
		# Find the length of the inputted string.
		str_len=`printf "${#tbinput}"`
		# Set the string to the correct last position for the _subscript_ point.
		str_len=$[ ( $str_len - 1 ) ]
		# Now check for continuous numerical charaters ONLY.
		for count in $( seq 0 $str_len )
		do
			# Reuse variable _number_ to obtain each character per loop.
			number=`printf "${tbinput:$count:1}"`
			# Now convert the character to a decimal number.
			number=`printf "%d" \'$number`
			# IF ANY ASCII character exists that is not numerical then reset the scan jump value.
			if [ $number -le 47 ]
			then
				scan_jump=1
				tbinput=1
			fi
			if [ $number -ge 58 ]
			then
				scan_jump=1
				tbinput=1
			fi
		done
		# If all is OK pass the "tbinput" value into the "scan_jump" variable.
		scan_jump=$tbinput
		# Do a final check that the number is not out of bounds.
		if [ $scan_jump -le 1 ]
		then
			scan_jump=1
		fi
		# Reuse number for upper limit...
		number=$[ ( ( ( $scan_end - $scan_start ) / 64 ) + 1 ) ]
		if [ $scan_jump -ge $number ]
		then
			scan_jump=$number
		fi
		printf "\x1B[0;37;40m\x1B[22;4fScan start at offset $scan_start, with a jump rate of $scan_jump."
		sleep 1
		setup=" Uncalibrated horizontal scan, vertical and storage modes, AC coupled only. "
	fi
	# ********** User timebase section end. ***********
	# ********* Calibrated timebase section. **********
	if [ "$kbinput" == "FASTEST" ]
	then
		scan_start=0
		scan_jump=1
		setup=" Uncalibrated horizontal scan, vertical and storage modes, AC coupled only. "
	fi
	if [ "$kbinput" == "1mS" ]
	then
		scan_start=0
		setup=" 1mS/DIV, uncalibrated vertical and storage modes, AC coupled only.         "
		if [ $demo -eq 0 ]
		then
			scan_jump=6
		fi
		if [ $demo -eq 1 ]
		then
			scan_jump=1
		fi
		if [ $demo -eq 2 ]
		then
			scan_jump=6
		fi
	fi
	if [ "$kbinput" == "10mS" ]
	then
		scan_start=0
		setup=" 10mS/DIV, uncalibrated vertical and storage modes, AC coupled only.        "
		if [ $demo -eq 0 ]
		then
			scan_jump=60
		fi
		if [ $demo -eq 1 ]
		then
			scan_jump=10
		fi
		if [ $demo -eq 2 ]
		then
			scan_jump=60
		fi
	fi
	if [ "$kbinput" == "100mS" ]
	then
		scan_start=0
		setup=" 100mS/DIV, uncalibrated vertical and storage modes, AC coupled only.       "
		if [ $demo -eq 0 ]
		then
			scan_jump=600
		fi
		if [ $demo -eq 1 ]
		then
			scan_jump=100
		fi
		if [ $demo -eq 2 ]
		then
			scan_jump=600
		fi
	fi
	# *********** Calibrated timebase end. ************
	#
	# ************* Vertical components. **************
	# ******** Pseudo-vertical shift control. *********
	if [ "$kbinput" == "SHIFT" ]
	then
		while true
		do
			scanloops=1
			status=1
			hold=0
			printf "\x1B[0;37;40m\x1B[20;14f"
			# This input method is something akin to BASIC's INKEY$...
			read -p "Vertical shift:- U for up 1, D for down 1, <CR> to RETURN:- " -n 1 -s vshift
			printf "\x1B[0;37;40m\x1B[20;14f                                                                 \x1B[0;37;40m\x1B[20;14f"
			if [ "$vshift" == "" ]
			then
				break
			fi
			if [ "$vshift" == "D" ]
			then
				vert_shift=$[ ( $vert_shift + 1 ) ]
			fi
			if [ "$vshift" == "U" ]
			then
				vert_shift=$[ ( $vert_shift - 1 ) ]
			# Ensure the shift psoition is NOT out of bounds.
			fi
			if [ $vert_shift -ge 6 ]
			then
				vert_shift=6
			fi
			if [ $vert_shift -le -2 ]
			then
				vert_shift=-2
			fi
			printf "\x1B[23;3f Vertical shift is $[ ( 2 - $vert_shift ) ] from the mid-point position...                        "
		done
	fi
	# ****** Pseudo-vertical shift control end. *******
	# ********** Connect all plotted points. **********
	if [ "$kbinput" == "DRAW" ]
	then
		drawline=1
		status=3
		hold=0
		scanloops=1
		statusline
		sleep 1
	fi
	# ************* Connected plots done. *************
	#
	# **** PSEUDO synchronisation and triggering. ****
	if [ "$kbinput" == "TRIG" ]
	then
		synchronise=" and OFF"
		sync_point=128
		status=0
		hold=0
		scan_start=$[ ( $scan_start + 1 ) ]
		scan_jump=1
		scanloops=1
		subscript=$scan_start
		grab=0
		if [ $scan_start -ge $scan_end ]
		then
			scan_start=0
			break
		fi
		printf "\x1B[0;37;40m\x1B[20;14f"
		read -p "Set trigger type, <CR> to disable:- " -e kbinput
		printf "\x1B[0;37;40m\x1B[20;14f                                                                 \x1B[0;37;40m\x1B[20;14f"
		if [ "$kbinput" == "SYNCEQ" ]
		then
			synchronise=", ON and fixed"
			trigger
			for subscript in $( seq $scan_start $scan_end )
			do
				grab=`hexdump -n1 -s$subscript -v -e '1/1 "%u"' /tmp/waveform.raw`
				if [ $grab -eq $sync_point ]
				then
					scan_start=$subscript
					break
				fi
			done
		fi
		if [ "$kbinput" == "SYNCGT" ]
		then
			synchronise=", ON and positive going"
			trigger
			: # NOP... Place holder only.
		fi
		if [ "$kbinput" == "SYNCLT" ]
		then
			synchronise=", ON and negative going"
			trigger
			: # NOP... Place holder only...
		fi
		if [ "$kbinput" == "EXT" ]
		then
			# Remember Corona688's code from the early stages of this thread...
			synchronise=", EXTERNAL and waiting"
			: # NOP... Place holder only,
		fi
		status=4
		statusline
		sleep 1
	fi
	# ** PSEUDO synchronisation and triggering end. ***
	#
	# ************* Auto-saving facility. *************
	if [ "$kbinput" == "SAVEON" ]
	then
		status=5
		save_string="ON"
		statusline
		sleep 2
	fi
	if [ "$kbinput" == "SAVEOFF" ]
	then
		status=1
		save_string="OFF"
		statusline
	fi
	# *********** Auto-saving facility end. ***********
	statusline
}

# #########################################################
# Help clears the screen to the startup defaults and prints command line help...
commandhelp()
{
	status=2
	hold=0
	printf "\x1B[0m"
	clear
	printf "CURRENT COMMANDS AVAILABLE:-\n\n"
	printf "<CR> ................................................. Reruns the scan(s) again.\n"
	printf "RUN<CR> ......................... Reruns the scan(s), always with real captures.\n"
	printf "QUIT<CR> .................................................... Quits the program.\n"
	printf "HELP<CR> ................................................ This help as required.\n"
	printf "HOLD<CR> ........................................ Switch to pseudo-storage mode.\n"
	printf "DEMO<CR> .......... Switch capture to default DEMO mode and 10 continuous scans.\n"
	printf "DSP<CR> ...................... Switch capture to Linux /dev/dsp mode and 1 scan.\n"
	printf "SOX<CR> ....... Switch capture to multi-platform SOund eXchange mode and 1 scan.\n"
	printf "ONE<CR> ......................................... Sets the number of scans to 1.\n"
	printf "TEN<CR> ........................................ Sets the number of scans to 10.\n"
	printf "HUNDRED<CR> ............. Sets the number of scans to 100, (not very practical).\n"
	printf "VER<CR> .................. Displays the version number inside the status window.\n"
	printf "TBVAR<CR> ............ Set up uncalibrated user timebase offset and jump points.\n"
	printf "        SubCommands: ............................. Follow the on screen prompts.\n"
	printf "FASTEST<CR> .................. Set all modes to the fastest possible scan speed.\n"
	printf "1mS<CR> .......................................... Set scanning rate to 1mS/DIV.\n"
	printf "10mS<CR> ........................................ Set scanning rate to 10mS/DIV.\n"
	printf "100mS<CR> ...................................... Set scanning rate to 100mS/DIV.\n"
	printf "SHIFT<CR> ............ Set the vertical position from -4 to +4 to the mid-point.\n"
	printf "        SubCommands: ............ Press U or D then <CR> when value is obtained.\n"
	printf "\n"
	read -p "Press <CR> to continue:- " -e kbinput
	clear
	printf "CURRENT COMMANDS AVAILABLE:-\n\n"
	printf "DRAW<CR> .......... Connect up each vertical plot to give a fully lined display.\n"
	printf "TRIG<CR> ........... Sets the synchronisation methods for storage mode retraces.\n"
	printf "        SubCommand: SYNCEQ ........ Set the internal SYNC to a fixed value only.\n"
	printf "        SubCommand: SYNCGT ......................................... Unfinished.\n"
	printf "        SubCommand: SYNCLT ......................................... Unfinished.\n"
	printf "        SubCommand: EXT ............................................ Unfinished.\n"
	printf "SAVEON<CR> .................... Auto-saves EVERY scan with a numerical filename.\n"
	printf "SAVEOFF<CR> ....................................... Disables auto-save facility.\n"
	printf "\n"
	printf "Manual here: <  http://wisecracker.host22.com/public/AudioScope_Manual.readme  >\n"
	printf "\n"
	read -p "Press <CR> to continue:- " -e kbinput
	display
	statusline
}

# #########################################################
# This is the active part of the pseudo-synchroisation section.
trigger()
{
	while true
	do
		printf "\x1B[0;37;40m\x1B[20;14f"
		# This input method is something akin to BASIC's INKEY$...
		read -p "Sync point:- U for up 1, D for down 1, <CR> to RETURN:- " -n 1 -s sync_input
		printf "\x1B[0;37;40m\x1B[20;14f                                                                 \x1B[0;37;40m\x1B[20;14f"
		if [ "$sync_input" == "" ]
		then
			break
		fi
		if [ "$sync_input" == "U" ]
		then
			sync_point=$[ ( $sync_point + 1 ) ]
		fi
		if [ "$sync_input" == "D" ]
		then
			sync_point=$[ ( $sync_point - 1 ) ]
		# Ensure the synchronisation point is NOT out of bounds.
		fi
		if [ $sync_point -ge 240 ]
		then
			sync_point=240
		fi
		if [ $sync_point -le 15 ]
		then
			sync_point=15
		fi
		printf "\x1B[23;3f Synchronisation point set to $sync_point...                                        "
	done
}

# #########################################################
# Do an initial screen set up...
display
statusline
setup=$version

# #########################################################
# This is the main loop...
while true
do
	for scan in $( seq 1 $scanloops )
	do
		# "hold" determines a new captured scan or retrace of an existing scan...
		if [ $hold -eq 1 ]
		then
			waveform
		fi
		display
		statusline
		plot
		if [ $drawline -eq 1 ]
		then
			draw
		fi
		if [ "$save_string" == "ON" ]
		then
			savefile=`date +%s`
			cp /tmp/waveform.raw /tmp/$savefile
		fi
	done
	status=0
	statusline
	kbcommands
done

# #########################################################
# Getout, autosave AudioScope.config, cleanup and quit...
if [ $status -eq 255 ]
then
	# Save the user configuration file.
	user_config
	# Remove "Shell AudioScope" from the title bar.
	printf "\x1B]0;\x07"
	sleep 0.1
	# Reset back to normal...
	printf "\x1B[0m"
	clear
	reset
fi
printf "\nProgram terminated...\n\nTerminal reset back to startup defaults...\n\n"

# #########################################################
# The FIRST extremely simple construction part.
# This is a simple I/O board for testing for the Macbook Pro 13 inch...
# It is just as easy to replace the 4 pole 3.5mm Jack Plug with 2 x 3.5mm Stereo Jack
# Plugs for machines with separate I/O sockets.
#                                                       Orange.       White flylead.
# Tip ----->  O  <------------------------------------+---------O <----------+--------+
# Ring 1 -->  H  <-------------------------+-----------)--------O <- Blue.   |        |
# Ring 2 -->  H  <--------------+-----+-----)----------)--------O <- Yellow. |        |
# _Gnd_ --->  H  <----+         |  C1 | +  |          |         O <- Green.  |        |
#           +===+     |         \   =====  \          \         |            \        |
#           |   |     |         /   --+--  /          /         |            /        |
#        P1 |   |     |         \     |    \          \         |            \        |
#           |   |     |      R1 /     | R2 /       R3 /         |         R4 /        |
#            \ /      |         \     |    \          \         |            \        |
#             H       |         /     |    /          /         |            /        |
#            ~~~      |         |     |    |          |         |            |        |
#                     +---------+------)---+----------+---------+------------+        |
# Pseudo-Ground. -> __|__             |                                               |
#                   /////             +-----------------------------------------------+
# P1 ......... 3.5mm, 4 pole jack plug.
# R1 ......... 2K2, 1/8W, 5% tolerence resistor.
# R2, R3 ..... 33R, 1/8W, 5% tolerence resistor.
# R4 ......... 1M, 1/8W, 5% tolerence resistor.
# C1 ......... 47uF, 16V electrolytic.
# 4 way terminal block.
# Stripboard, (Verobaord), as required.
# Green, yellow, orange, blue and white wire as required.
# Small cable ties, optional.
# Stick on cable clip, optional.
# Crimp terminal, 1 off, optional.
# #########################################################

This might seem like a full edition but there is so much yet to be added that I have relaesed this one and only version here as a learning tool.

Any further relaeses will be metioned occasionally in the comments section...

Enjoy finding simple solutions to often very difficult problems...

Finally EVERYTHING that is required for this project will always be inside the single script...

Upon reading the script you will see what I mean...

Bazza, G0LCU.

3 comments

As of 28-11-2013 the latest version is here:-

Version 0.20.03...

http://wisecracker.host22.com/public/AudioScope.sh

Latest public version here:-

Version 0.20.00...

http://www.unix.com/showthread.php?t=212939&page=6

Barry Walker (author) 7 years, 10 months ago  # | flag

As of 12-01-2014 the latest version 0.20.58 is on both URLs above...

Barry Walker (author) 6 years, 9 months ago  # | flag

As of 07-03-2015 the latest official version is 03120. It is now 135072 bytes in size so far.

It can be found here:-

http://wisecracker.host22.com/public/AudioScope.sh

And the UNIX URL above...

Enjoy...