I am trying to get an arduino to communicate with the BeagleBone Black and
send some measured sensor data over via the serial port. I am using the
most recent version of node red to do this. I am running the latest version
of Debian.
I have confirmed using an oscilloscope that the arduino's serial port is
outputting the information when it is supposed to (it's triggered by an
interrupt sent by the BBB). I can see the serial ports that are supposedly
enabled in /dev and they appear as ttyO1, ttyO2, and ttyO4, and I have
confirmed the port mapping and ruled out wiring issues as well (I'm using a
logic level converter to go from the arduino's 5V to the BBB's 3.3V level).
The ports also appear to map like so:
lrwxrwxrwx 1 root root 5 Jun 9 22:37 ttyO1 -> ttyS1
lrwxrwxrwx 1 root root 5 Jun 9 22:37 ttyO2 -> ttyS2
lrwxrwxrwx 1 root root 5 Jun 9 22:37 ttyO4 -> ttyS4
Node red also sees these ports and indicated that they are 'connected'
which I assume means opened.
When I attempt to receive data on the BBB from ANY of these ports I am
unable to see anything on the output in node red or from the command
prompt.
I am using a baud rate of 300 to rule out timing issues. I have also
confirmed that the arduino's serial settings should be matched to what the
BBB is expecting. Lastly, I have even tried sending simple strings from one
serial port to the other on the BBB itself.
Has anyone here had this sort of issue and if so, how did you come to a
solution?
*TL;DR: *When I attempt to receive data on the BBB from ANY of the UART
ports I am unable to see anything on the output in node red or from the
command prompt. Already ruled out the obvious issues, and the BBB clearly
sees the ports. What could be the issue here?
json source from nodered:
[{"id":"1a47c203.f9dc9e","type":"serial-port","z":"1d18ac42.887634","serialport":"/dev/ttyO2","serialbaud":"300","databits":"8","parity":"none","stopbits":"1","newline":"\\n","bin":"false","out":"char","addchar":false},{"id":"879d3b35.230e98","type":"debug","z":"1d18ac42.887634","name":"Sensor
Output
View","active":true,"console":"false","complete":"true","x":385.78334045410156,"y":60.44999694824219,"wires":[]},{"id":"5eef16d7.037da8","type":"serial
in","z":"1d18ac42.887634","name":"Sensor
Data","serial":"1a47c203.f9dc9e","x":124.7833251953125,"y":150.683349609375,"wires":[["879d3b35.230e98"]]},{"id":"52614fb3.59fe2","type":"bbb-discrete-out","z":"1d18ac42.887634","pin":"P8_7","inverting":false,"toggle":true,"defaultState":"1","name":"Interrupt
to
Sensors","x":284.38330078125,"y":348.3000183105469,"wires":[["ff5b799a.86d1a"]]},{"id":"bdbd2367.9d45a","type":"inject","z":"1d18ac42.887634","name":"Poll
Sensors","topic":"","payload":"\\n
int","payloadType":"str","repeat":"","crontab":"","once":false,"x":126.38330078125,"y":283.7333679199219,"wires":[["52614fb3.59fe2"]]},{"id":"ff5b799a.86d1a","type":"trigger","z":"1d18ac42.887634","op1":"int","op2":"0","op1type":"val","op2type":"pay","duration":"250","extend":false,"units":"ms","reset":"","name":"Reset","x":468.08331298828125,"y":352.0333251953125,"wires":[["b8a60fb7.8d86f"]]},{"id":"b8a60fb7.8d86f","type":"bbb-discrete-out","z":"1d18ac42.887634","pin":"P8_7","inverting":false,"toggle":true,"defaultState":"1","name":"Reset
to
HIGH","x":611.38330078125,"y":405.96668243408203,"wires":[[]]},{"id":"7e38a1db.de0088","type":"comment","z":"1d18ac42.887634","name":"Send
Interrupt to
Arduino","info":"","x":385.7833251953125,"y":286.9666748046875,"wires":[]},{"id":"b75bbc4d.e19d18","type":"comment","z":"1d18ac42.887634","name":"Serial
Port
Setup","info":"","x":142.0833282470703,"y":79.08333587646484,"wires":[]}]
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