Hello everyone,
I have a general question about disabling interrupts in ARM processors.
It is quite obvious that using the __disable_irq() in privileged mode should have the effect that no interrupt routines are called, but is the CPU still reactive to their triggering events by setting the interrupt flag? I would assume that it wouldn't, but need to know for sure.
Thanks, George
I have a general question about disabling interrupts
most processors, ARM or not, have, for purposes of synchronization, a two step interrupt process. step1: set a flag "interrupt request" step2" if "interrupt request" active, interrupt most processors, ARM or not, will, when interrups are disabled, do step 1 but hold step2 till the interrupt is enabled again.
I say "most" because I can not claim to know them all, but as to my recollection the word is not "most" but "all"
Erik
PS if you do not want an interrupt, where step 1 occurred during disable, to occur when you enable, the process is clear "interrupt request" flag ebanble interrupt
PPS I/O is quite different between ARM processors, so for a definite answer you must specify the actual dvice