alt_write_flash - single threaded

Hello,

thanks a lot for your ideas...

I have solved the problem!

It was my fault...

The problem was a Stack Overflow within the Task wich writes to the flash memory. This overflow accours only, if the flash-write will be executed and if a interrupt context places it's data on the stack of this tasks either. In this case the stack usage increases from about 36% to overflow on a 22 kByte Stack!!

It is possible to use the flush-driver on a multythreaded enviroment as long as only one task is accessing the flash-device. I think that this is what Altera means with the parameter "thread safe: no"