Hello,
I am using STM32F407ZGT6 Cortex-M4 microcontroller. I am interested in changing the priority of a certain interrupt while servicing the same interrupt. Is that possible?
More elaborately, lets say I have an interrupt which has a priority of 4. The interrupt has arrived and I am currently in the ISR servicing that interrupt. After running a certain code (in the ISR), I want to run the remaining code (in the ISR) to run at higher priority (say 2). And when I was about to leave the ISR, I again change its priority to 4. Is this possible?
Currently, I have achieved this by calling a higher priority interrupt inside the lower priority interrupt.
Thanking in anticipation for your time and help.
I think you can use __set_BASEPRI(priority) for this.
Try having a look at the "Can I prevent my interrupt handlers from being interrupted" article at the ARM Information Center.
Although written or Cortex-M3, it also applied to Cortex-M4.
...Searching with Google also gives you this article, which is good reading.