Nios V Command Shell/juart-terminal input for std::cin

[ReubenS]

Cyclone 10 GX, programmed with a jic with a factory and two application images, using the GSFI bootloader method. Given that programming takes several minutes, for development I want to be able to input values through juart-terminal to choose configuration settings and behaviour after programming - e.g. choosing which application to switch to by inputting the start address, whether to use a watchdog, etc.

I have been using std::cout/cin, which worked at first. However at some point I made a change to an application image and when a particular std::cin line was reached, it no longer took input. The program is then stuck and I can only power cycle or wait for the watchdog to timeout to return to factory.

Importantly, the line where this happens is always the same for a given program, but if I make an unrelated change - even as small as changing an int i = 0; to int i = 1; - then the line might change. If I remove the new code and return to the working program I had originally, that still works. So the issue is inconsistent but not random.

Is there a fix for this, or if not what other options do I have to provide input after programming?

[BoonBengT_Altera]

Hi @ReubenS,

Thank you for posting in Intel community forum and hope all is well.

Would perhaps recommend to check on the following item below:

- Ensure that the UART driver (especially any stdio redirection) is initialized before any use of cin/cout.

- Use fgets() and printf() temporarily to isolate the problem from cin (could avoid issues related to cin buffering or stream corruption)

- Ensure watchdogs is not trigger during blocked i/o (if cin blocks waiting for inputs and the watchdog is not serviced there could be weird behavior observed)

Hope that clarify.

Best Wishes

BB

[BoonBengT_Altera]

Hi @ReubenS,

Greetings, just checking in to see if there is any further doubts in regards to this matter.

Hope your doubts have been clarified.

Best Wishes

BB

[BoonBengT_Altera]

Hi @ReubenS,

Greetings, as we do not receive any further clarification/updates on the matter, hence would assume challenge are overcome. Please login to ‘ https://supporttickets.intel.com/s/?language=en_US’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions. For new queries, please feel free to open a new thread and we will be right with you. Pleasure having you here.

Best Wishes

BB