[Icc-avr] Global Interrupts

[Andrew]

Hi,
 
i have an ADC connect to my  system using SPI and in the back ground a tick timer overflow interrupt (100ms). when i call my read ADC function to avoid any interrupts messing things i was going to do the follwing: -

CLI(); // Disable all interrupts
Get 4 Channels of results

SEI(); // Re-enable interrupts



My question is will doing that screw the timer up or will it carry on from where it left off after i re-enable the interrupts.



Andy 

  ----- Original Message ----- 
  From: Paul Mateer 
  To: Discussion list for ICCAVR and ICCtiny Users. You do NOT need tosubscribe to icc-announce if you are a member of this. 
  Sent: Tuesday, January 08, 2008 8:13 PM
  Subject: Re: [Icc-avr] Software Delay


  ...then I test dbc_kpd for my keypress.



  On Jan 8, 2008 11:31 AM, Paul Mateer <paul.aa9gg at gmail.com> wrote:

    Keybounce "delays" can get you into trouble sometimes.  I use this code placed into an timer-overflow interrupt:

    #define KEYPADS       PINH
    unsigned int dbc_j, dbc_i, dbc_idx, dbc_kpd,State[10];   //  key-debounce stuff 

    interrupt routine()
    {
      // begin new keypad debounce routine 
        State[dbc_idx] = KEYPADS & 0xFF;
        ++dbc_idx;
        dbc_j = 0xff;
        for(dbc_i=0; dbc_i < 4; dbc_i++) dbc_j = dbc_j & State[dbc_i];  
        dbc_kpd = dbc_j;
        
        if(dbc_idx >= 5) dbc_idx = 0;

    }


    On Jan 8, 2008 10:45 AM, Daub, Stephan < stephan.daub at sap.com> wrote: 

      Hi andy,

      To determine the length of the loop you simpy add the inner loop maschine cycles plus the entry cycles plus for/while time. Once you have calc this you multiply this with your systemclock and youre done. 

      Best, stephan


      -----Original Message-----
      From: icc-avr-bounces at imagecraft.com < icc-avr-bounces at imagecraft.com>
      To: Discussion list for ICCAVR and ICCtiny Users. You do NOT needtosubscribeto icc-announce if you are a member of this. < icc-avr at imagecraft.com >
      Sent: Tue Jan 08 17:18:10 2008
      Subject: [Icc-avr] Software Delay

      Hi,

      I need a good software time delay that sit's in an interrupt handler. Basically i need it to de-bounce a pin (INT1). and i cannot use a timer as the timer interrupts are disabled at this point in the code. 

      I was thinking of using : -

      #pragma interrupt_handler int1_isr:iv_INT1
      void int1_isr(void)
      {

      delay_2();

      }



      //----------------------------------------------------------------------------- 
      //
      // Function name : Delay_2
      //
      // Returns : None
      //
      // Parameters : None
      //
      // Purpose : De-Bouce delay
      //
      //-----------------------------------------------------------------------------
      void delay_2 (void)
      {

      for (loop_int = 0; loop_int < 100; loop_int++)
      {
      NOP();
      }

      loop_int = 0x00;

      }



      Only probem is that i have no clue how long this delay is? ( i am running the main clock at 8Mhz) 



      Does anydy have a better software delay function.



      Andy



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    -- 
    Paul Mateer, AA9GG 
    Elan Engineering Corp.
    www.elanengr.com 



  -- 
  Paul Mateer, AA9GG
  Elan Engineering Corp.
  www.elanengr.com 


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