From Regulus Berdin
Given a number in bin, from 1 to 30, this code will drive that number of LED's on.
; 1-30 to 30 leds ;input: bin ;output: led1,led2,led3,led4 convert: clrf led1 clrf led2 clrf led3 clrf led4 incf bin,f loop: decfsz bin,f ;do not include 0 goto $+2 return decf bin,f setc ;turn on led rlf led4,f rlf led3,f rlf led2,f rlf led1,f goto loop ;-------------------- I have another solution, using the fact that 1-30 bar is equal to 2^y - 1. This routine is isochronous and faster on some values than the above. Here goes: convert: clrf a1 clrf a2 clrf a3 clrf a4 movlw a4 ;2^bin btfsc bin,3 movlw a3 btfsc bin,4 addlw -2 ;corrected from 'movlw a1' movwf FSR movlw B'00000001' btfsc bin,1 movlw B'00000100' movwf INDF btfsc bin,0 addwf INDF,f btfsc bin,2 swapf INDF,f movlw 1 ;subtract by 1 subwf a4,f skpc subwf a3,f skpc subwf a2,f skpc subwf a1,f
You don't need a 30bit number just because you want to drive a 30led bar :) All you need is a number from 0 to 30, which boils down to a simple division, if your representation is linear. 0->0%->no led, 65535->100%->all (30) leds. that's 30 intervals for 65535, hence each interval (corresponding to one led more) is 65535/30... you divide your load by this number, and get the number of leds to switch on.
|file: /Techref/microchip/ledbargraph.htm, 2KB, , updated: 2009/2/13 15:22, local time: 2018/12/12 07:40,
|©2018 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?|
<A HREF="http://www.piclist.com/techref/microchip/ledbargraph.htm"> PIC Microcontoller Input / Output LED Method s</A>
|Did you find what you needed?|
PICList 2018 contributors:
o List host: MIT, Site host massmind.org, Top posters @20181212 RussellMc, Van Horn, David, Sean Breheny, David C Brown, Neil, Isaac M. Bavaresco, Bob Blick, Harold Hallikainen, AB Pearce - UKRI STFC, John Gardner,
* 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!