Lib hangs for SDI-12-Slave on ATmega328p

[joembedded]

Hi there,

I’m working with SDI-12 both professionally and for personal projects. For business use, I’ve developed a bare-metal solution, but at home, I’m exploring more minimalistic sensor setups.

While testing with a PC-based SDI-12 terminal ( SDI12Term ), I’ve noticed that the software occasionally hangs. The loop() function still runs (I added a Serial.print('*') every second to verify), but it stops responding to any commands. I’m not deeply experienced with Arduino internals, but it feels like the interrupts might be getting stuck?

For reference, I put the boilerplate here: SDI_12_slave project ( SDI-Slave-Boiler ),
slightly modified to your Example 'h':

• store the slave address in non-volatile memory.
• added CRC handling for MC-commands.
  These modifications work well, and feel free to incorporate them if helpful.

Hardware info:
Microcontroller: ATmega328p / Pin 7
No other peripherals in use.
Signal integrity looks fine on my scope.

Any ideas what might cause the terminal to become unresponsive? I’d really appreciate your insights.

Best regards,
Jo