Avrdude not in sync errors attempting to update emonTx firmware

[Sage-Energy]

@Bill.Thomson

Have you tried swapping the data Rx and TX lines?

I haven’t, because emonhub receives the data from the emonTx just fine with the wires as they are…

@borpin

Obvious question, but you have connected the rst pin to that pin on the Pi?

Yes! I also tried it with GPIO7(BCM 4) before modifying the script and results were the same…

@borpin

@borpin

You need to edit the file /opt/openenergymonitor/avrdude-rpi/autoreset and change the pin number to 12.

I edited a different file when I did it.

So the setup on my SD card is slightly different to that described in the docs, despite following the exact same instructions (and it was already installed as-is anyway when I received the prewritten SD card from the shop - running the script, or doing it manually changed nothing).

I might be misunderstanding how symlinks work so bear with me…

The instructions in the README.md file (in the /opt/openenergymonitor/avrdude-rpi/ folder and on github and elsewhere) imply to me that you should end up with a file named “avrdude-autoreset” in /usr/bin/ and that there should be a symlink to this file in the same folder named “avrdude”, with the actual original avrdude renamed “avrdude-original”.

Running the script doesn’t leave me with a “avrdude-autoreset” file, only an “autoreset” file…?

Why are there two copies of these files, one in /usr/bin/ and another in /opt/openenergymonitor/??? The version in /opt/openenergymonitor/ still has GPIO7 as the reset pin so clearly this is not the version being run when I try it…

@borpin

Did you stop emonhub first?

@Sage-Energy

I’ve also stopped the emonhub service first and checked via cat/dev/ttyAMA0 and the emonTx is still outputting data on the serial port but nothing else appears.