I have the following situation: I was given a AVR32UC3 (pretty neat thing) and a measurement device. These two communicate via SPI, which works as expected (after fiddling with SPI params and so on).
The program structure is as follows:
- Init the device via SPI
- Start the measurement via SPI
- Wait for the measurement to be done (this is signaled via a GPIO --> Interrupt)
- Read the measurement data via SPI
- Go to 2
At this very moment, I can roughly guess how long the measurement will take (~3ms). I currently ignore the interrupt, do busy waiting instead of 3, then read the data.
Now for my question: I would like to get rid of that "busy" waiting. Of course, if another interrupt arrives (from some other peripheral) the code will execute that interrupt anyway but code in my main loop will not be processed during the busy waiting. How would I do this "clean" using the interrupt itself.
The idea would be:
- Setup interrupt source + conditions
- Start the measurement
- Interrupt occurs
- Pick up where I left
How does the source code (pseudo-code) for something like this look? How is this done PROPERLY?