1 // *********************************************************************
    2 //   Custom DPA Handler code - Handling buttons                        *
    3 // *********************************************************************
    4 // Copyright (c) IQRF Tech s.r.o.
    5 //
    6 // File:    $RCSfile: CustomDpaHandler-Buttons.c,v $
    7 // Version: $Revision: 1.5 $
    8 // Date:    $Date: 2019/05/06 07:13:14 $
    9 //
   10 // Revision history:
   11 //   2019/01/10  Release for DPA 4.00
   12 //
   13 // *********************************************************************
   14 
   15 // Online DPA documentation http://www.iqrf.org/DpaTechGuide/
   16 
   17 // Default IQRF include (modify the path according to your setup)
   18 #include "IQRF.h"
   19 
   20 // Default DPA header (modify the path according to your setup)
   21 #include "DPA.h"
   22 // Default Custom DPA Handler header (modify the path according to your setup)
   23 #include "DPAcustomHandler.h"
   24 
   25 //############################################################################################
   26 
   27 // Button descriptor
   28 typedef struct
   29 {
   30   // Timer to measure debouncing, recommended to be the 1st field to save the code
   31   uns8  Timer;
   32   // Last button state [must be initialized to 0xFF if the initial state of the button is not sure to be HIGH]
   33   uns8  LastState;
   34   // Button's PIC port: 0 = PORTA, 1 = PORTB, ... [must be initialized]
   35   uns8  Port;
   36   // Button's bit mask (only one bit must be set) [must be initialized]
   37   uns8  ButtonMask;
   38   // Debounce interval measured in the timer ticks + 1 [must be initialized]
   39   uns8  DebounceDelay;
   40   // 0 if button is HIGH, 1 if button is LOW
   41   uns8  ButtonIsLow;
   42 } TButton;
   43 
   44 // Handles the button and sets ButtonIsLow appropriately
   45 void HandleButton( uns16 pButton @ FSR0 );
   46 
   47 // Must be the 1st defined function in the source code in order to be placed at the correct FLASH location!
   48 //############################################################################################
   49 bit CustomDpaHandler()
   50 //############################################################################################
   51 {
   52   // Handler presence mark
   53   clrwdt();
   54 
   55   // We demonstrate 2 buttons by 1 physical button but with different debouncing value
   56   static TButton ButtonFast, ButtonSlow;
   57 
   58   // Detect DPA event to handle (unused event handlers can be commented out or even deleted)
   59   switch ( GetDpaEvent() )
   60   {
   61     // -------------------------------------------------
   62     case DpaEvent_Interrupt:
   63       // Do an extra quick background interrupt work
   64       // ! The time spent handling this event is critical.If there is no interrupt to handle return immediately otherwise keep the code as fast as possible.
   65       // ! Make sure the event is the 1st case in the main switch statement at the handler routine.This ensures that the event is handled as the 1st one.
   66       // ! It is desirable that this event is handled with immediate return even if it is not used by the custom handler because the Interrupt event is raised on every MCU interrupt and the “empty” return handler ensures the shortest possible interrupt routine response time.
   67       // ! Only global variables or local ones marked by static keyword can be used to allow reentrancy.
   68       // ! Make sure race condition does not occur when accessing those variables at other places.
   69       // ! Make sure( inspect.lst file generated by C compiler ) compiler does not create any hidden temporary local variable( occurs when using division, multiplication or bit shifts ) at the event handler code.The name of such variable is usually Cnumbercnt.
   70       // ! Do not call any OS functions except setINDFx().
   71       // ! Do not use any OS variables especially for writing access.
   72       // ! All above rules apply also to any other function being called from the event handler code, although calling any function from Interrupt event is not recommended because of additional MCU stack usage.
   73 
   74       //  If TMR6 interrupt occurred
   75       if ( TMR6IF )
   76       {
   77         // Unmask interrupt
   78         TMR6IF = FALSE;
   79 
   80         // Handle buttons
   81         HandleButton( &ButtonFast );
   82         HandleButton( &ButtonSlow );
   83 
   84         // Demonstration of the fast button
   85         if ( ButtonFast.ButtonIsLow.0 )
   86           setLEDR();
   87         else
   88           stopLEDR();
   89 
   90         // Demonstration of the slow button
   91         if ( ButtonSlow.ButtonIsLow.0 )
   92           setLEDG();
   93         else
   94           stopLEDG();
   95       }
   96 
   97       return Carry;
   98 
   99       // -------------------------------------------------
  100     case DpaEvent_Init:
  101       // Do a one time initialization work before main loop starts
  102 
  103       // Initialize buttons' descriptors (CC5X does not support initialization of the static variables)
  104 
  105       // Fast button @ IQRF standard button
  106       ButtonFast.LastState = 0xFF;
  107       ButtonFast.Port = 1;                  // PORTB
  108       ButtonFast.ButtonMask = 0b0001.0000;  // PORTB.4
  109       ButtonFast.DebounceDelay = 2 + 1 /* x64ms */;
  110 
  111       // Slow button @ IQRF standard button
  112       ButtonSlow.LastState = 0xFF;
  113       ButtonSlow.Port = 1;                  // PORTB
  114       ButtonSlow.ButtonMask = 0b0001.0000;  // PORTB.4
  115       ButtonSlow.DebounceDelay = 15 + 1 /* x64ms */;
  116 
  117       // Setup TMR6 for 64 ms interval
  118       PR6 = 250 - 1;
  119       T6CON = 0b0.1111.1.11;
  120       TMR6IE = TRUE;
  121       break;
  122 
  123       // -------------------------------------------------
  124     case DpaEvent_AfterSleep:
  125       // Called on wake-up from sleep
  126       TMR6IE = TRUE;
  127       TMR6ON = TRUE;
  128       break;
  129 
  130       // -------------------------------------------------
  131     case DpaEvent_BeforeSleep:
  132       // Called before going to sleep (the same handling as DpaEvent_DisableInterrupts event)
  133       // -------------------------------------------------
  134     case DpaEvent_DisableInterrupts:
  135       // Called when device needs all hardware interrupts to be disabled (before Reset, Restart, LoadCode, Remove bond, and Run RFPGM)
  136       // Must not use TMR6 any more
  137       TMR6ON = FALSE;
  138       TMR6IE = FALSE;
  139       break;
  140   }
  141 
  142   return FALSE;
  143 }
  144 
  145 //############################################################################################
  146 void HandleButton( uns16 pButton @ FSR0 )
  147 //############################################################################################
  148 {
  149   // FSR0 points to the button's descriptor
  150   // (Local variables must be static as they are used inside interrupt routine)
  151 
  152   // Timer is active (non zero)?
  153   W = FSR0[offsetof( TButton, Timer )];
  154   if ( W != 0 ) // Note: must not modify W
  155   {
  156     // Yes, decrement the timer
  157     FSR0 += offsetof( TButton, Timer ); // Note: Timer is the 1st field of TButton so this generates no code and must not modify W
  158     setINDF0( W - 1 );
  159     FSR0 += -(int8)offsetof( TButton, Timer ); // Note: Timer is the 1st field of TButton so this generates no code, casting fixes CC5X bug
  160   }
  161 
  162   // FSR1 will point to the button's port
  163   FSR1L = FSR0[offsetof( TButton, Port )] + ( &PORTA & 0xFF );
  164   FSR1H = &PORTA >> 8;
  165 
  166   // Current state of the button, only the button bit is used, other bits are masked to zero
  167   static uns8 state;
  168   state = *FSR1 & FSR0[offsetof( TButton, ButtonMask )];
  169 
  170   // Button state changed?
  171   if ( ( state ^ FSR0[offsetof( TButton, LastState )] ) != 0 )
  172   {
  173     FSR0 += offsetof( TButton, Timer ); // Note: Timer is the 1st field of TButton so this generates no code and must not modify W
  174     // Initialize timer for debouncing
  175     setINDF0( FSR0[offsetof( TButton, DebounceDelay ) - offsetof( TButton, Timer )] );
  176     // Adjust pointer to LastState field
  177     FSR0 += (int8)( offsetof( TButton, LastState ) - offsetof( TButton, Timer ) );  // Note: casting fixes CC5X bug
  178     // Store the current state as the last one
  179     setINDF0( state );
  180     return; // Note: saves Flash by direct GOTO setINDF0
  181   }
  182 
  183   // Timer is almost over?
  184   if ( FSR0[offsetof( TButton, Timer )] != 1 )
  185     // No
  186     return;
  187 
  188   // The button state was stable for the debounce interval, prepare the pointer to store the new state
  189   FSR0 += offsetof( TButton, ButtonIsLow );
  190   // Ready for new state "button is HIGH"
  191   W = FALSE;
  192   // Is button LOW?
  193   if ( state == 0 ) // Note: must not modify W
  194     // Ready for new state "button is LOW"
  195     W = TRUE;
  196 
  197   // Set the button external state
  198   setINDF0( W );
  199 }
  200 
  201 //############################################################################################
  202 // Default Custom DPA Handler header; 2nd include to implement Code bumper to detect too long code of the Custom DPA Handler (modify the path according to your setup) 
  203 #include "DPAcustomHandler.h"
  204 //############################################################################################
  205