Another binary manipulation thread. Post: 302849029

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Top Forums UNIX for Advanced & Expert Users Another binary manipulation thread. Post 302849029 by wisecracker on Friday 30th of August 2013 04:57:05 PM

08-30-2013

Registered User

Getting byte zero, in pseudo_zero mode, into the shell is easy as the Arduino Voltmeter DEMO below shows.

However I have attempted to put byte zero into a string variable as a single character and I now concede defeat. It is not possible with default commands to force value of byte zero into any variable, so a minimum of "\0", 2 bytes, is required to _emulate_ it...

Code:

#!/bin/bash --posix
# $VER: Arduino.sh_Version_0.00.10_(C)2013_B.Walker_G0LCU.

Arduino_Device="Unknown!"
DATA="0"

> /tmp/usbdata.raw

echo "Remove the Arduino board from the USB port ,IF, it is connected."
read -p "Press <CR> to continue:- " -e Arduino_Device
echo "The error report IS expected!"
ls /dev/cu.usb*
echo "Now connect the Arduino board to the USB port."
sleep 5
read -p "Press <CR> to continue:- " -e Arduino_Device

Arduino_Device="`ls /dev/cu.usb*`"
clear
while true
do
	if [ ${#DATA} -le 0 ]
	then
		echo "ERROR! Unsuccessful data aquisition..."
		break
	fi
	DATA=$[ ( $DATA * 20 ) ]
	printf "\\x1B[11;33f0.000 Volts DC.\n\n"
	if [ ${#DATA} -eq 2 ]
	then
		printf "\\x1B[11;36f$DATA\n\n"
	fi
	if [ ${#DATA} -eq 3 ]
	then
		printf "\\x1B[11;35f$DATA\n\n"
	fi
	if [ ${#DATA} -eq 4 ]
	then
		DATA="${DATA:0:1}.${DATA:1:2}"
		printf "\\x1B[11;33f$DATA\n\n"
	fi
	dd if="$Arduino_Device" of=/tmp/usbdata.raw bs=1 count=1
	DATA=`hexdump -n1 -s0 -v -e '1/1 "%u"' /tmp/usbdata.raw`
done

Display like this:-

Code:

Last login: Fri Aug 30 21:34:09 on ttys000
AMIGA:barrywalker~> ./Arduino.sh
Remove the Arduino board from the USB port ,IF, it is connected.
Press <CR> to continue:- 
The error report IS expected!
ls: /dev/cu.usb*: No such file or directory
Now connect the Arduino board to the USB port.
Press <CR> to continue:- 

                                0.000 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007705 secs (130 bytes/sec)c)

# AND...

                                2.580 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007620 secs (131 bytes/sec)))

# AND...

                                5.100 Volts DC.

1+0 records in
1+0 records out
1 bytes transferred in 0.007678 secs (130 bytes/sec)))

wisecracker

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LEARN ABOUT DEBIAN

ard-parse-boards

ARD-PARSE-BOARDS(1)					      General Commands Manual					       ARD-PARSE-BOARDS(1)

NAME

       ard-parse-boards - Read data from the Arduino boards.txt file

USAGE

       Dump all the data in the file:
	$ ard-parse-boards --dump

       See which boards we know about:
	$ ard-parse-boards --boards

       Look for a particular board...
	$ ard-parse-boards --find uno

       multiple terms are implicitly ANDed:
	$ ard-parse-boards --find duemil 328

       Dump all the data for a particular board:
	$ ard-parse-boards atmega328

       Extract a particular field:
	$ ard-parse-boards atmega328 build.f_cpu

DESCRIPTION

       The  Arduino  software package ships with a boards.txt file which tells the Arduino IDE details about particular hardware. So when the user
       says he's got a shiny new Arduino Uno, boards.txt knows that it has a 16MHz ATmega328 on it. It would be nice to access these data from the
       command line too.

       In  normal  operation  you simply specify the tag given to the board in the boards.txt file, and optionally a field name. This program then
       extracts the data to STDOUT.

       Most boards have names which are quite unwieldy, so we always refer to a board by a tag, not its name. Strictly the tag is the  bit  before
       the first dot in the boards.txt key. You can see a list of board tags and names with the "--boards" option.

OPTIONS

       --boards_txt=[file]
	      Specify the full path to the boards.txt file.

       The following options all disable the normal 'lookup' operation.

       --dump Dump the complete database in YAML format.

       --boards
	      Print a list of the tag and name of every board in the file.

       --find [query] <query> ...
	      Find  matching  data. Strictly, return a list of values which match all of the query terms, treating each term as a case-insensitive
	      regexp.

	      For example:
	       --find 328
	       List data containing 328 (anywhere in the value).

	       --find due
	       List data containing 'due' (e.g. duemilanove).

	       --find 328 due
	       List data containing both 328 and due.

BUGS AND LIMITATIONS

       There are no known bugs in this application.

       Please report problems to the author.

       Patches are welcome.

AUTHOR

       Martin Oldfield, ex-atelier@mjo.tc

       Thanks to Mark Sproul who suggested doing something like this to me ages ago.

LICENSE AND COPYRIGHT

       Copyright (c) 2011, Martin Oldfield. All rights reserved.

       This file is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as  published
       by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

       This  program  is  distributed  in  the	hope  that  it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

								     MAY 2012						       ARD-PARSE-BOARDS(1)