please dont rip this site

PIC Micro Controller C Routine Math / Functions / Conversions Function

Set bit x

by Scott Dattalo

void set_bit(unsigned char *bit_array, char bit_position, char new_state)
{


  if(new_state)
    bit_array[bit_position >> 3] |= ( 1 << (bit_position & 7) );
  else
    bit_array[bit_position >> 3] &= ~(1 << (bit_position & 7));

}

By Michael Rigby Jones

By butchering the routine a bit to make it less general i.e. removing the bit_array pointer and by breaking down the maths into separate chunks I managed to get this down to 38 words, at the cost of a couple of temp variables.
void set_bit(unsigned char bit_position, unsigned char new_state)
{
        unsigned char bitmask;
        unsigned char byteptr;

        byteptr = bit_position >> 3;
        bitmask = 1 << (bit_position & 7);

        if(new_state)
        {
                bitarray[byteptr] |= bitmask;
        }
        else
        {
                bitarray[byteptr] &= ~bitmask;
        }
}


file: /Techref/microchip/language/c/math/setbitx.htm, 1KB, , updated: 2000/7/18 15:47, local time: 2024/3/28 14:04,
TOP NEW HELP FIND: 
44.200.101.170:LOG IN

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://www.piclist.com/techref/microchip/language/c/math/setbitx.htm"> PIC Micro Controller C Routine Math / Functions / Conversions Function - Set bit x</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

  PICList 2024 contributors:
o List host: MIT, Site host massmind.org, Top posters @none found
- Page Editors: James Newton, David Cary, and YOU!
* Roman Black of Black Robotics donates from sales of Linistep stepper controller kits.
* Ashley Roll of Digital Nemesis donates from sales of RCL-1 RS232 to TTL converters.
* Monthly Subscribers: Gregg Rew. on-going support is MOST appreciated!
* Contributors: Richard Seriani, Sr.
 

Welcome to www.piclist.com!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .