Is there any alignment restriction on interrupt vectors?

[mreed]

Super weird thing happening:

After my latest build I would receive one interrupt from I2C and that's all.

After a bit of snooping around I found that the I2C interrupt was being disabled in the NVIC.

So I installed some code that would detect when this happened and break.

I have to figure out who's disabling the interrupt, so I thought I'd put some counters

in the I2C interrupt routine, just a simple in and out count. Both uint8's.

Now, it won't do it. No matter what I try I2C interrupts now work fine.

Is there something with the interrupt alignment? Any ideas?

No, that don't make sense either. The interrupt is vectored to the stm32l0xx_it.c module

and that didn't change. My guess is I have a rogue pointer writing to the NVIC.

Anybody have a suggestion on how to find it?

[mreed]

Found It!

The host I2C device is sending requests to the my micro every 1 second. When I connected my utility and started sending I2C commands, they would occasionally

collide and create an invalid message.

The default I2C error handler disables the I2C interrupts.

:ant: :backhand_index_pointing_left: