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???
08/09/12 16:18
Read: 623 times


 
#188028 - timer expansion
Responding to: Michael Karas's previous message
Brilliant suggestion Michael. Exactly what I need for my current project. I wasn't sure about triggering the interrupts till you mentioned that.
project using AT89LP6440
bass pedal organ system with 5 harmonic drawbars like a Hammond.
5 Drawbars- slider pots read by the A/D.
Each drawbar controls gain of a certain frequency, relative to the key being played.
For example, while playing a lo C bass note,
the drawbars would add (going up in freq) CGCEGC.
The 3 C notes are 1st, 2nd, 3rd harmonics.
The uP could produce 5 sinewaves simultaneously, using 5 different timers and your timer expansion idea, then MAC them together internally setting the gain of each with the slider. The output would then come from the single onboard dac. Should work.





List of 7 messages in thread
TopicAuthorDate
Faking an interrupt      Garry Motter      07/23/12 15:28      
   or use a better part      Jim Granville      07/23/12 19:40      
   More Interrupts      Michael Karas      07/23/12 21:59      
      timer expansion      Rick Gebhardt      08/09/12 16:18      
         5 timers?      Per Westermark      08/09/12 16:25      
            5 sinewaves      Rick Gebhardt      08/09/12 23:24      
               Phases      Per Westermark      08/10/12 00:54      

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