Mikrokontroller C-ASM

[Papp Zoltán]

2005.12.11. 21:54:34 dátumon Fuzesi Arnold <arno at externet.hu> írta:

> Vannak C-ben un bitmezők...
>
> Ez tulkeppen egy struktura aminek a byte bitjei az elemei.
> Miutan definialja a forditohoz adott fejlec file altalaban, Neked csak  
> ennyi a dolgod:
>
> #define LED PORTB_Bit0
>
> Azaz a portb 0. bitje lesz  a LED tulkeppen.
>
> Periferiaknal meg szokott lenni ez a definicio alapbol.
>
> Ha sajat byte valtozot akarsz igy szetbontani majd 8 bitkent kezelni,  
> arra is van megoldas...de inkabb attol most megkimelnelek... :)

Ne kíméld, IAR proci definícióban van ez:

/****************************************************************************
  * An example showing the SFR_B() macro call,
  * the expanded result and usage of this result:
  *
  * SFR_B_R(0x1F,   AVR) Expands to:
  * __io union {
  *             unsigned char AVR;                 // The sfrb as 1 byte
  *             struct {                           // The sfrb as 8 bits
  *                     unsigned char AVR_Bit0:1,
  *                                   AVR_Bit1:1,
  *                                   AVR_Bit2:1,
  *                                   AVR_Bit3:1,
  *                                   AVR_Bit4:1,
  *                                   AVR_Bit5:1,
  *                                   AVR_Bit6:1,
  *                                   AVR_Bit7:1;
  *                    };
  *            } @ 0x1F;
  * Examples of how to use the expanded result:
  * AVR |= (1<<5);
  * or like this:
  * AVR_Bit5 = 1;
  *
  *
  *
  * An example showing the SFR_B_N() macro call,
  * the expanded result and usage of this result:
  * SFR_B_N(0x25,  TCCR2, FOC2, WGM20, COM21, COM20, WGM21, CS22, CS21,  
CS20)
  *  Expands to:
  *  __io union {
  *              unsigned char TCCR2;
  *              struct {
  *                      unsigned char TCCR2_Bit0:1,
  *                                    TCCR2_Bit1:1,
  *                                    TCCR2_Bit2:1,
  *                                    TCCR2_Bit3:1,
  *                                    TCCR2_Bit4:1,
  *                                    TCCR2_Bit5:1,
  *                                    TCCR2_Bit6:1,
  *                                    TCCR2_Bit7:1;
  *                     };
  *              struct {
  *                      unsigned char TCCR2_CS20:1,
  *                                    TCCR2_CS21:1,
  *                                    TCCR2_CS22:1,
  *                                    TCCR2_WGM21:1,
  *                                    TCCR2_COM20:1,
  *                                    TCCR2_COM21:1,
  *                                    TCCR2_WGM20:1,
  *                                    TCCR2_FOC2:1;
  *                     };
  *             } @ 0x25;
  * Examples of how to use the expanded result:
  * TCCR2 |= (1<<5);
  * or if ENABLE_BIT_DEFINITIONS is defined
  * TCCR2 |= (1<<COM21);
  * or like this:
  * TCCR2_Bit5 = 1;
  * or like this:
  * TCCR2_COM21 = 1;
  ***************************************************************************/

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-- 
Papp Zoltán
OneWay Electronics