I'm sorry your answer raised more questions I am a newbie and don't understand
On Monday, November 24, 2014 7:43:55 AM UTC-8, George Lu wrote: > > > On Sat, Nov 22, 2014 at 7:49 PM, John Mladenik <john...@sbcglobal.net > <javascript:>> wrote: > >> So it worked but once I let the board sit not being powered overnight it >> stopped working. Do you or anyone know how to get the UART2 working and >> stay working once powered down and then turned back on? >> > > Once power cycled, you would need to start up the program again so that > the serial port could be properly opened for writing. I would have the > bonescript code in, say, /home/debian/doSerial.js, and run that > automatically on every reboot. There are a number of ways to do this. One > quick way is try to add a line in /etc/crontab to run this command on > @reboot: > I do not have a directory named /etc/crontab nor do I have a file named doSerial.js on my Beaglebone. Do I need to create this directory and file? If so what do I put in the file? The bonescript/javascript code I am using is embedded in the HTML file given above in original post, that I browse to from chrome. When the UART is working when I browse to the HTML on the Beaglebone and click send to send the data entered in the HTML. > > @reboot root cd /home/debian && > NODE_PATH=/usr/local/lib/node_modules && export NODE_PATH && doSerial.js > > Assuming you are using debian image, /dev/ttyO1 and /dev/ttyO2 have > "rw-rw---" as their permission. So you either need to run it as root or add > your desired user to the dialout group to be able to write to these serial > interfaces. > ttyO2 is in the /dev folder and has crw-rw---T permissions set. I only have a single user that is what it was configured as when I got the BBB and I am pretty sure it is a root user. No password I just use root as the username to log in. when I run the HTML/Javascript above ithe chrome debugger does say open each time I click send. > > If doSerial.js crashes for any reason, you could use a process monitor to > restart it. Supervisord <http://supervisord.org/>, forever > <https://github.com/nodejitsu/forever>, pm2 > <https://github.com/Unitech/pm2>, are some options to explore. > > >> >> On Wednesday, November 19, 2014 3:44:26 PM UTC-8, George Lu wrote: >>> >>> On Wed, Nov 19, 2014 at 3:26 PM, John Mladenik <john...@sbcglobal.net> >>> wrote: >>> >>>> I need to be able to send raw data out of the serial port using >>>> Bonescript command b.serialWrite. I set up an HTML Bonescript to send >>>> data and then looked on the logic analyzer to see what bit pattern is sent >>>> out. The pattern is always the ASCII value of the character whether the >>>> variable is a text or number. >>>> >>>> Does anyone know how to pass to b.serialWrite a value so that the UART >>>> outputs that value? >>>> >>>> so I want to have >>>> >>>> var port = '/dev/ttyO2'; // set UART port >>>> var data = 0x55 ; >>>> b.serialWrite(port, data ); >>>> >>>> and for the bit pattern coming out of the UART to be 01010101 >>>> >>>> I tried using String.fromCharCode(data); but this only works for >>>> values up to 127 (0x7F) since that is all ASCII goes to. This must not >>>> support extended ASCII? >>>> >>>> here is my html/javascript to test this functionality >>>> >>>> <html> >>>> <body> >>>> >>>> Uart Byte:<br> >>>> <input type="number" name="value" id='value'/> >>>> <button onclick="uartWr()">SEND</button> >>>> >>>> </body> >>>> <head> >>>> <script src="/bonescript.js"></script> >>>> <script> >>>> function uartWr() { >>>> var b = require('bonescript'); >>>> var port = '/dev/ttyO2'; // set UART port >>>> var data = document.getElementById('value').value; >>>> // set baud rate and buffer size >>>> var options = { >>>> baudrate: 9600 >>>> }; >>>> >>>> b.serialWrite(port, data ); >>>> >>>> } >>>> </script> >>>> >>>> </head> >>>> </html> >>>> >>> >>> I recall BoneScript uses https://github.com/ >>> voodootikigod/node-serialport for serial port interface. >>> You should be able to send raw binary with b.serialWrite(port, [0x55]); >>> Data should be a buffer (http://nodejs.org/api/buffer.html). >>> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
