|
Re: Shuffling variables
Yes I know this. I was having difficulty because I was trying to think of a way to do it in a manner that the pic would understand. Our brains can easily process this and substitute that values, but with the pic, it's not that easy.Originally Posted by rsocor01
That's exactly what I was envisioning in my head, but I couldn't get it out. Thank you Richard. I'll try to plug this into my code and see how it works.
|
Re: Shuffling variables
up until now I never found a use for "swap" this makes even smaller and more elegant code
Code:'* Name : UNTITLED.BAS * '* Author : [select VIEW...EDITOR OPTIONS] * '* Notice : Copyright (c) 2014 [select VIEW...EDITOR OPTIONS] * '* : All Rights Reserved * '* Date : 29/11/2014 * '* Version : 1.0 * '* Notes : * '* : pic12f1822 * '**************************************************************** #CONFIG cfg1 = _FOSC_INTOSC cfg1&= _WDTE_ON cfg1&= _PWRTE_OFF cfg1&= _MCLRE_ON cfg1&= _CP_OFF cfg1&= _CPD_OFF cfg1&= _BOREN_ON cfg1&= _CLKOUTEN_OFF cfg1&= _IESO_ON cfg1&= _FCMEN_ON __CONFIG _CONFIG1, cfg1 cfg2 = _WRT_OFF cfg2&= _PLLEN_OFF cfg2&= _STVREN_ON cfg2&= _BORV_19 cfg2&= _LVP_OFF __CONFIG _CONFIG2, cfg2 #ENDCONFIG osccon=$6a '4 mhz anselA=0 trisa=000 a var byte b var byte c var byte d var byte pin_mode var bit x var byte all_off var byte pins_on var byte a=1 ;portb.0 b=2 ;portb.1 c=4 ;portb.2 d=16 ;portb.4 pin_mode=0 all_off=!(a+b+c+d) lata = lata & all_off action: pins_on=a+b for x = 1 to 5 lata = lata | pins_on pause 200 lata = lata & all_off pause 200 next x pins_on=c+d for x = 1 to 5 lata = lata | pins_on pause 200 lata = lata & all_off pause 200 next x gosub shuffle goto action shuffle : pin_mode =!pin_mode if pin_mode then swap a,d swap b,c else swap a ,c swap b ,d endif return
|
Re: Shuffling variables
shuffle wrong this is better
Code:shuffle : pin_mode =!pin_mode if pin_mode then swap a,d swap b,c else swap b ,d swap c ,d endif
Last edited by richard; - 30th November 2014 at 11:26. Reason: pressed wrong button
|
Re: Shuffling variables
Better? I'd say it's AWESOME! I had thought to suggest (as your original answer) using array values or various mask patterns perhaps, but - to my humble skills - there is simply no improvement possible to "swap". Somewhere, in the back of my mind, I remember seeing it, but had forgotten... I'll remember now!
|
Re: Shuffling variables
That's awesome, however, I have one question. What is (=!)? Can you please translate to English what the line "pin_mode =!pin_mode" means. That's the only part I'm having a problem with right now. The good book references it at !=, but that is used when you have two expressions, not the same expression. The same expression will always be equal to itself.
Thanks,
Tony
|
Re: Shuffling variables
! is the logical not operator afaik , anyway that's the way I use it (its a C thing but works in pbp too)
I think its the same as the "tilde" ~ but my laptop keyboard makes it hard to find. maybe someone can confirm this
pin_mode = ! (pin_mode) is the way to read it , if pin_mode is 1 then ! pin_mode becomes 0 or if pin_mode is 0 then ! pin_mode becomes 1
not to be confused with != which is not equal to
ps
just tried it . seems "~ ! not" are all the same thing (on bit and byte vars anyway) for what it worth
Last edited by richard; - 2nd December 2014 at 05:12. Reason: more
|
Re: Shuffling variables
In binary, where there are two states, "NOT" or any variation thereof (~ ! etc) reverses the bit value, so... NOT 1 = 0. It makes sense on a bit level... if it's NOT a zero, it must be a one, yes? Now, of course if it is not, not a one, then it was all along a zero. In comedy, the "double negative" can lead to all sorts of Don Knott's style of humor - in computer science... not so much.
Members who have read this thread : 0You do not have permission to view the list of names.
Posting Permissions
Bookmarks