Timeouts Only With Natural Boot

Go To Last Post

4 posts / 0 new

Author

Message

jionbha

Level: New Member

Joined: Tue. May 12, 2020

Posts: 7 View posts

Posted by jionbha: Fri. Jul 10, 2020 - 06:10 PM

I'll describe the behavior I'm seeing, and if anyone has any insight into what may be the cause I'd very much appreciate it.

I'm programming an XMEGA C device and talking to it through Modbus RTU. I've somehow gotten my project into a state where I can run the Modbus communications perfectly if I hit Start Debugging and load it up from Atmel Studio 7. It also works perfectly if I program the flash from the Device Programming menu.

If I power cycle my device and let it boot up on its own, then I will timeout on all Modbus communications.

If I leave a debugging session running from Atmel Studio, power cycle my device and let it boot up on its own, [it hits the timeouts here], then hit Stop Debugging in Atmel Studio it will work perfectly.

Thanks in advance.

Tags:

Tools, Atmel Studio (AVR-related)

ki0bk

Level: Raving Lunatic

Joined: Mon. Sep 8, 2014

Posts: 9525 View posts

Location: Over the rainbow

Posted by ki0bk: Fri. Jul 10, 2020 - 06:19 PM

jionbha wrote:

If I power cycle my device and let it boot up on its own, then I will timeout

That sounds like a classic case of a forgotten critical variable needs to be initialized before it can be used. Perhaps a pointer? But that is just a guess

Jim

Keys to wealth:

Invest for cash flow, not capital gains!

Wealth is attracted, not chased!

Income is proportional to how many you serve!

jionbha

Level: New Member

Joined: Tue. May 12, 2020

Posts: 7 View posts

Posted by jionbha: Fri. Jul 10, 2020 - 07:11 PM

I think I figured it out -- I had some sensors I was trying to communicate with when they were not fully powered, or in some way still initializing themselves when power hit them. If I were to hit Start Debugging, they had already had power for a while. They were getting thrown into a bad comms. state if communication with them was attempted too soon.