C18 structure for 'bits' - Page 2 - Electronic Circuits Projects Diagrams Free

AtomSoft · 5th July 2009, 11:46 AM

heh i know im not the only one that helped but your welcome

Mike, K8LH · 5th July 2009, 04:12 PM

Hi 3v0,

Thanks to your example (and patience) I think I figured it out and I'm able to keep my original BoostC variable names and macro names. Thank you.

Thank you all for the fine examples. I learned a lot from all of them.

Kind regards, Mike

Code:

typedef union
{ struct
  { unsigned b0:1;
    unsigned b1:1;
    unsigned b2:1;
    unsigned b3:1;
    unsigned b4:1;
    unsigned b5:1;
    unsigned b6:1;
    unsigned b7:1;
  };
  struct
  { unsigned asbyte:8;
  };
} bitbyte;

bitbyte x;

#define flags x.asbyte      // switch flag bits
#define RunSw x.b0          // Motor on/off switch on RC0 (flags.b0)
#define DirSw x.b2          // Motor fwd/rev switch on RC2 (flags.b2)

while(1)
{ if(RunSw)                 // if "Run" switch press
  { RunSw = 0;              // clear switch flag bit
    MotorOn ^= 1;           // toggle motor on/off pin
  }
}

AtomSoft · 5th July 2009, 04:31 PM

Nice! Ill be sure to Add a section for structures in the C18 TIPS & TRICKS v10 PDF

3v0 · 5th July 2009, 05:00 PM

If one used struct's to define the bits and coded using the struct members, it should work on both compilers. This allows one to avoid the boostC name.bit.

Mike, K8LH · 5th July 2009, 05:44 PM

Yeah, I'm lookin' into that right now. Trying the following to access bits as sw.Run, sw.Jog, sw.Dir, and byte-wide access as sw.flags for parallel switch logic in ISR. I suppose I could get used to doing it this way, if I have to (grin).

Regards, Mike

Code:

typedef union
{ struct
  { unsigned Run:1;               // Run switch flag (sw on RC0)
    unsigned Jog:1;               // Jog switch flag (sw on RC1)
    unsigned Dir:1;               // Dir switch flag (sw on RC2)
    unsigned unused:5;            // spare/unused bits
  };
  struct
  { unsigned flags:8;             // byte wide flag access
  };
} bitbyte;

bitbyte sw;

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5th July 2009, 11:46 AM	#16
AtomSoft	heh i know im not the only one that helped but your welcome __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

5th July 2009, 04:31 PM	#18
AtomSoft	Nice! Ill be sure to Add a section for structures in the C18 TIPS & TRICKS v10 PDF __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

5th July 2009, 05:00 PM	#19
3v0	If one used struct's to define the bits and coded using the struct members, it should work on both compilers. This allows one to avoid the boostC name.bit. __________________ Please post questions to the forums. PM's are for personal communication. BCHS/3v0's Tutorials Junebug USB PIC programmer kit., USB Bit Whacker, The 15 Minute Printed Circuit Board! (+drill time) Last edited by 3v0; 5th July 2009 at 05:01 PM.

5th July 2009, 05:44 PM	#20
Mike, K8LH	Yeah, I'm lookin' into that right now. Trying the following to access bits as sw.Run, sw.Jog, sw.Dir, and byte-wide access as sw.flags for parallel switch logic in ISR. I suppose I could get used to doing it this way, if I have to (grin). Regards, Mike Code: typedef union { struct { unsigned Run:1; // Run switch flag (sw on RC0) unsigned Jog:1; // Jog switch flag (sw on RC1) unsigned Dir:1; // Dir switch flag (sw on RC2) unsigned unused:5; // spare/unused bits }; struct { unsigned flags:8; // byte wide flag access }; } bitbyte; bitbyte sw; Last edited by Mike, K8LH; 6th July 2009 at 12:35 PM.