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1. 

   bart_dood
   Member

   hi poslathian, you're right I don't care about the actual physical time based off a unit like microseconds or milliseconds. All I care about is some tick/clock counter that has a set increment in time that can be counting in and out of an interrupt. I can always do some conversion at some point to put it into microseconds so I can refer it to actual time, this would be to calculate rotational velocity etc.

   Its the next major item I need to tackle in my code, so I'll try and spend some time today on it today or tonight.

   Posted 4 years ago #
2. 

   bart_dood
   Member

   Hey folks,

   I think I've found a solution that might work. I haven't tested yet; basically I created two functions for the two types of interrupts (external and internally timed).
   Inside these functions I just set a flag high.

   Inside the main program loop which previously contained nothing (everything was run from interrupts) now has an IF which if the corresponding flag is set high runs the appropriate function (and resetting the flag back to false).

   The beauty of this is micros() should still work. Also the time shift that will occur due to the overhead of the flag and going back to the main loop will cancel out, as this delay should be almost exactly the same every time, so the time between each timed interrupt should be the same.

   I tried doing a faster interrupt (1 microsecond) and then counting 100 of them before triggering my 100 microsecond function, this didn't work very well.

   Posted 4 years ago #

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