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1. 

   rjgrahek
   Member

   I had working code to do quadrature decoding based on the timer setup shown in thread posted 9 months ago by drinkdhmo "hardware quadrature decoding issues". The development was moved to a different computer. IDE version 009 was downloaded and installed on this machine. With this version of the IDE, the encoder output from the Timer only moves a few counts in each direction and behaves weird. The code works fine on IDE version 006. Is anyone else experiencing this type of problem or have a solution?

   Posted 4 years ago #
2. 

   poslathian
   LeafLabs

   This is very interesting. Can you provide the code? Also, have you tried 0.0.10 Beta? (see the blog for a link)

   Posted 4 years ago #
3. 

   rjgrahek
   Member

   Sorry about the delay in getting back to you.

   Below is the code I am using to setup the timer the quadrature encoder:

   pinMode(5, INPUT);
   pinMode(9, INPUT);
   Timer* encoderTimer;
   encoderTimer = (Timer*)TIMER4_BASE;
   encoderTimer->CCMR1 = 0xF1F1; //CC1S=01
   encoderTimer->CCMR2 = 0x0000;
   encoderTimer->CCER = 0x0011;
   encoderTimer->SMCR = 0x0003; //SMS=011
   encoderTimer->CR1 = 0x0001; //CEN=1
   encoderTimer->CR2 = 0x0000;
   encoderTimer->PSC = 0x0000;

   Timer4.setCompare1(CPR - 1);
   Timer4.setCompare2(MAX_CNT - CPR + 1);
   Timer4.attachCompare1Interrupt(pendOverflow);
   Timer4.attachCompare2Interrupt(pendUnderflow);
   encoderTimer->CNT = 0x0000; //reset the counter before we use it

   I tried using the 0.0.10 Beta and the results were the same as version 009. Version 006 still produces the correct output with this timer setup.

   Posted 4 years ago #
4. 

   mbolivar
   LeafLabs

   rjgrahek,

   Thanks for the update. I've added a bug targeting 0.0.12:

   http://code.google.com/p/leaflabs/issues/detail?id=68

   Posted 4 years ago #

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