[ECOS] priority of main thread

Andrew Lunn andrew@lunn.ch
Thu Nov 20 16:03:00 GMT 2008

On Thu, Nov 20, 2008 at 04:22:58PM +0100, Robert Brusa wrote:
> Hi,
> in my system, I have a cyg_user_start() as well as a main() function. The 
> first includes calls to initialize various modules. main() contains an  
> eternal loop and is assumed to work as a normal thread. The problem is  
> that main produces a hanger when I call cyg_spi_transfer to read my  
> onboard-RTC. When using this RTC-module in a test program with a single  
> thread it works. It also works (in main) when I change the transfer-mode  
> to polling. This let me think that there is some kind of priority 
> problem.

I would not necessarily agree with this. If it is a priority problem,
it suggests one of the threads running with higher priority than main
is spinning, so stopping main from running. This is normally a
bug. However this does not really fit with PIO working.

This actually sounds like an interrupt problem. I would put a
breakpoint on the interrupt handler and see if it gets called.


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