varunrvarun
Newbie level 5
Hi All,
I am using MSP430F169. In our program we have this comparator ISR nested inside the PORT2 ISR. The program is designed such a way that if an external (for eg: RF) event occurs, the code should get into the PORT2 ISR. From there, we get into the Comparator ISR.
What i see here is as soon as the PORT2 ISR is called, the GIE is disabled. The code was unable to enter into the Comparator ISR since the GIE is disabled. Am seriously confused now.
Do we have to enable GIE before the code reaches the comparator everytime? I tried doing this manually and it worked. The code was able to enter into Comparator ISR.
Also, when an ISR is being serviced, will the GIE be disabled automatically? If this is the case how will nested ISR's work? Does this mean we have to enable the GIE within every ISR?
Priority wise, Comparator has got higher priority than the PORT2.
I am using MSP430F169. In our program we have this comparator ISR nested inside the PORT2 ISR. The program is designed such a way that if an external (for eg: RF) event occurs, the code should get into the PORT2 ISR. From there, we get into the Comparator ISR.
What i see here is as soon as the PORT2 ISR is called, the GIE is disabled. The code was unable to enter into the Comparator ISR since the GIE is disabled. Am seriously confused now.
Do we have to enable GIE before the code reaches the comparator everytime? I tried doing this manually and it worked. The code was able to enter into Comparator ISR.
Also, when an ISR is being serviced, will the GIE be disabled automatically? If this is the case how will nested ISR's work? Does this mean we have to enable the GIE within every ISR?
Priority wise, Comparator has got higher priority than the PORT2.
