ESP8266 Community Forum

Do you need to disable interrupts when your inside an interrupt handler?
I thought you could only have one interrupt happening at a time?

DTrain123 wrote:Do you need to disable interrupts when your inside an interrupt handler?
I thought you could only have one interrupt happening at a time?

If I want to get pin0 for another interruption
How should I do this?

DTrain123 wrote:Do you need to disable interrupts when your inside an interrupt handler?
I thought you could only have one interrupt happening at a time?

It actually depends on what the interrupt needs to be doing.
When there are shared variables (for instance), you might not want to read/write their value at some points, since it may mess up your program flow.

You can have multiple interrupts at one time (each connected at a different GPIO), so you have to carefully consider whether you want to disable/re-enable interrupts inside an interrupt (but it's not compulsory).

QuickFix wrote: you have to carefully consider whether you want to disable/re-enable interrupts inside an interrupt (but it's not compulsory).

I had a look at core_esp8266_wiring_digital.c where attachInterrupt is defined.
On line 127 it has the code which calls the interrupt handler method:

In Arduino.h noInterrupts() is defined:

So interrupts have already been disabled before your method gets called. So no need to call noInterrupts() in your interrupt handler code.