using IntervalTimer with SPI.usingInterrupt()

[tenkai]

Is there anyway to attach an IntervalTimer interrupt to SPI using SPI.usingInterrupt()?

I am running into an issue where an SPI device which is updated in an IntervalTimer is causing problems with other SPI devices that are called in the main loop.

I found this thread, but its pretty old, figured it would make sense to start a new one:
https://forum.pjrc.com/threads/25582-SPI-sharing-between-interrupts-and-main-program


Thank you!
Tenkai

 

[Frank B]

This shows the usage: https://github.com/PaulStoffregen/Audio/blob/master/play_serialflash_raw.cpp
update() is called by an interrupt.

 

[PaulStoffregen]

Is there anyway to attach an IntervalTimer interrupt to SPI using SPI.usingInterrupt()?

No, but there really should be.....

 

[PaulStoffregen]

Ok, I've updated IntervalTimer.h to allow this.

To use this, replace your copy of IntervalTimer.h in hardware/teensy/avr/cores/teensy3. Then you should be able to do this:

void setup() {
  myTimer.begin(myfunc, 100.45);
  SPI.usingInterrupt(myTimer);
}

Please be aware you must start the IntervalTimer. Before it's started, it hasn't been allocated to any interrupt.

 

[tenkai]

ah! super awesome!! thank you Paul!

 

[tenkai]

wow, this works like a charm. magical!

 

[Xenoamor]

To use this, replace your copy of IntervalTimer.h in hardware/teensy/avr/cores/teensy3

Excellent use of operator overloading