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bugfight

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  18. 4x16 (8x8) Button/Duo-LED programming example

    in MIOS programming (C)

    Posted

    ok "soon" actually was soon in this case.

    i haven't checked this into svn, (tk let me know if you want me to...)

    but it is tested and working on my hardware.

    i'm not sure "descramble" is the best choice for naming it, though...

    here are the changes.

    in main.h i added:

    #define BLM_DESCRAMBLE_ROWS 1 //set this to 0 for 4x16 (like MB_Seq) and 1 for 8x8
    the rest of the changes are in main.c in Global variables, i added: 
    #if BLM_DESCRAMBLE_ROWS
unsigned char blm_button_row_dscrmbl;
#endif
    in DISPLAY_Tick(), i replaced    
    MIOS_LCD_PrintBCD3(blm_button_row);:
    with 
    
#if BLM_DESCRAMBLE_ROWS
  MIOS_LCD_PrintBCD3(blm_button_row_dscrmbl);
#else
  MIOS_LCD_PrintBCD3(blm_button_row);
#endif
    here is the entire MPROC_NotifyReceivedEvnt() which contains the scramble code: i also corrected an error in local vars where led_column and led_row were reversed... 
    void MPROC_NotifyReceivedEvnt(unsigned char evnt0, unsigned char evnt1, unsigned char evnt2) __wparam
{
  unsigned char led_column;
  unsigned char led_row;
  unsigned char evnt1Adj;
  unsigned char btnVal;

  // control the Duo-LEDs via Note On/Off Events
  // The colour is controlled with velocity value:
  // 0x00:       both LEDs off
  // 0x01..0x3f: green LED on
  // 0x40..0x5f: red LED on
  // 0x60..0x7f: both LEDs on

  // only MIDI note numbers from 0x00..0x3f are valid (-> 64 LEDs)

  evnt1Adj = (evnt1 - BLM_MIDI_STARTNOTE) & 0x7f;
  if( (evnt0 == 0x80 || evnt0 == 0x90) && (evnt1Adj < 0x40 ) ) {

    // derive LED column and row from note number
    
    led_column = evnt1Adj & 0x07;
#if BLM_DESCRAMBLE_ROWS
    //scramble the rows, NOTE: this method is not scalable
    blm_button_row_dscrmbl = evnt1Adj >> 3;
    led_row = blm_button_row_dscrmbl;

    led_row <<= 1;
    if(led_row & 0x08) {
      led_row &= 0x07;
      led_row++;
    }
#else
    led_row = evnt1Adj >> 3;
#endif

    // 90 xx 00 is the same like a note off event!
    // (-> http://www.borg.com/~jglatt/tech/midispec.htm)
    if( evnt0 == 0x80 || evnt2 == 0x00 ) 
    {
      // Note Off or velocity == 0x00: clear both LEDs
      blm_row_green[led_row] &= MIOS_HLP_GetBitANDMask(led_column);
      blm_row_red[led_row]   &= MIOS_HLP_GetBitANDMask(led_column);

      btnVal = 1;
    } 
    else 
    {
      btnVal = 0;

      if( evnt2 < 0x40 ) {
        // Velocity < 0x40: set green LED, clear red LED
        blm_row_green[led_row] |= MIOS_HLP_GetBitORMask(led_column);
        blm_row_red[led_row]   &= MIOS_HLP_GetBitANDMask(led_column);

      } else if( evnt2 < 0x60 ) {
        // Velocity < 0x60: clear green LED, set red LED
        blm_row_green[led_row] &= MIOS_HLP_GetBitANDMask(led_column);
        blm_row_red[led_row]   |= MIOS_HLP_GetBitORMask(led_column);
      } else {

        // Velocity >= 0x60: set both LEDs
        blm_row_green[led_row] |= MIOS_HLP_GetBitORMask(led_column);
        blm_row_red[led_row]   |= MIOS_HLP_GetBitORMask(led_column);
      }
    }

    // enable this code (turn #if 0 into #if 1) if midi notes should change the LCD display
    // disable it when LCD should only be affected via buttons
#if 1
    blm_button_row = led_row;
    blm_button_column = led_column;
    blm_button_value = btnVal;
    // request display update
    app_flags.DISPLAY_UPDATE_REQ = 1; 
#endif
  }
}
    here is the entire BLM_NotifyToggle() which contains the descramble code: 
    void BLM_NotifyToggle(unsigned char pin, unsigned char value) __wparam
{
  unsigned char mask;
  unsigned char noteNumber;
  
#if BLM_DESCRAMBLE_ROWS
  //convert blm_button_row to blm_button_row_dscrmbl.  NOTE: this method is not scalable
  blm_button_row_dscrmbl = blm_button_row >> 1;
  if( 0x01 & blm_button_row ) //if row is odd number
    blm_button_row_dscrmbl |= 0x04; //
  noteNumber = ((blm_button_row_dscrmbl << 3) + blm_button_column + BLM_MIDI_STARTNOTE) & 0x7f;
#else
  noteNumber = (pin + BLM_MIDI_STARTNOTE) & 0x7f;
#endif
  
  // send pin number and value as Note On Event
  MIOS_MIDI_TxBufferPut(0x90);
  MIOS_MIDI_TxBufferPut(noteNumber);
  MIOS_MIDI_TxBufferPut(value ? 0x00 : 0x7f);

  // enable this code (turn #if 0 into #if 1) if buttons should change the LED colour directly
  // disable it when LEDs should only be controlled via MIDI
#if 1
  // cycle colour whenever button has been pressed (value == 0)
  if( !value ) {
    mask = MIOS_HLP_GetBitORMask(blm_button_column);
    if ( blm_row_green[blm_button_row] & mask )
       blm_row_red[blm_button_row] ^= mask;
    blm_row_green[blm_button_row] ^= mask;
  }
#endif
  // request display update
  app_flags.DISPLAY_UPDATE_REQ = 1;
}

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