Hi!
I hope someone can help my with BBB UART4 serial, I need to read data from
Parallax RFID reader, strangest about this is it works some time especially
ehen I plugin/ plugout pin connection multiple times. And RFID is connected
to 4Dsystem 7lcd cape pin P9_11. Do I need use different pinMux for cape?
or enable, define pin ?
I use Linux beaglebone 3.8.13-bone70 #1 SMP Fri Jan 23 02:15:42 UTC 2015
armv7l GNU/Linux
When I list ttyo's ls -l /dev/ttyO* I get back crw-rw---- 1 root
dialout 249, 4 Jan 1 01:18 /dev/ttyO4
I enable UART4 with jacascript wit cloud9 script
var RFIDPin = "P9_11",
enableRFIDPin = "P8_19",
RFIDport = '/dev/ttyO4',
options = {
baudrate: 2400
//dataBits: 8,
//parity: 'none',
//stopBits: 1,
//buffersize: 1,
//flowControl: true
};
b.pinMode(enableRFIDPin, 'out');
b.digitalWrite(enableRFIDPin, enableRFIDstate);
b.serialOpen(RFIDport, options, onSerial);
function onSerial(x) {
setTimeout(function() {
if (x.err) {
console.log('***ERROR*** ' + JSON.stringify(x));
}
if (x.event == 'open') {
console.log('***OPENED***');
}
if (x.event == 'data') {
processTags(x.data);
}
},500);
return true;
}
function processTags(symbolByte) {
var char = String(symbolByte);
console.log(char);
var charCode = parseInt(char.charCodeAt(0));
if(charCode === 10 && lastCharCode === 13)
allow = true;
if(allow) {
if(compareTag.length < 11) {
compareTag += char;
} else {
allow = false;
compareTags();
}
}
lastCharCode = charCode;
return true;
}
Can someone suggest some practices or advice, commands, books to fpund out
what can cause thies issue?
Thansk,
Ingus
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