from Ron Kreymborg and Mike Keitz
[ed: rough guess is that about 2200 instructions will be executed]
see also:
;****************************************************************** ; ; Test program for 32-bit unsigned binary to BCD and BCD to ASCII. ; ;****************************************************************** title "32-bit binary to ascii" list p=pic16f84,r=dec,n=80,x=off,st=off include <p16f84.inc> errorlevel -302 ; no bank warnings errorlevel -305 ; no default dest warnings #define number 123456789 loadd macro local m,n,p p = number / 16777216 movlw p movwf bin m = (number - p * 16777216) / 65536 movlw m movwf bin+1 n = (number - p * 16777216 - m * 65536) / 256 movlw n movwf bin+2 movlw number - p * 16777216 - m * 65536 - n * 256 movwf bin+3 endm CBLOCK 0x0c bin:4 ; 32-bit binary number (unsigned) bcd:10 ; 10 BC digits or 10 ascii chars pti,pto ; pointers ii temp cnt ENDC loadd ; load test value <number> call b2bcd ; convert to 32-bit binary to 10 bcd call bcd2a ; convert 10 bcd to 10 ascii goto $ ;****************************************************************** ; Convert the 10 binary coded digits (5 bytes) starting at ; <bcd> into an ascii string also starting at <bcd>. Original ; bcd digits are lost. bcd2a movlw bcd+9 movwf pto ; destination pointer movlw bcd+4 movwf pti ; source pointer movlw 5 ; 5 bytes to process movwf cnt bcd2a1 movf pti,w ; get current input pointer movwf fsr decf pti,f ; prepare for next movf indf,w ; get 2 bcds movwf temp ; save for later movf pto,w ; get current output pointer movwf fsr decf pto,f ; prepare for next decf pto,f movf temp,w ; get digits back andlw 0x0f ; process lsd addlw "0" movwf indf ; to output decf fsr,f swapf temp,w ; process msd andlw 0x0f addlw "0" movwf indf ; to output decfsz cnt ; all digits? goto bcd2a1 return ; yes ;****************************************************************** ; Convert 32-bit binary number at <bin> into a bcd number ; at <bcd>. Uses Mike Keitz's procedure for handling bcd ; adjust; Modified Microchip AN526 for 32-bits. b2bcd movlw 32 ; 32-bits movwf ii ; make cycle counter clrf bcd ; clear result area clrf bcd+1 clrf bcd+2 clrf bcd+3 clrf bcd+4 b2bcd2 movlw bcd ; make pointer movwf fsr movlw 5 movwf cnt ; Mike's routine: b2bcd3 movlw 0x33 addwf indf,f ; add to both nybbles btfsc indf,3 ; test if low result > 7 andlw 0xf0 ; low result >7 so take the 3 out btfsc indf,7 ; test if high result > 7 andlw 0x0f ; high result > 7 so ok subwf indf,f ; any results <= 7, subtract back incf fsr,f ; point to next decfsz cnt goto b2bcd3 rlf bin+3,f ; get another bit rlf bin+2,f rlf bin+1,f rlf bin+0,f rlf bcd+4,f ; put it into bcd rlf bcd+3,f rlf bcd+2,f rlf bcd+1,f rlf bcd+0,f decfsz ii,f ; all done? goto b2bcd2 ; no, loop return ; yes end
Questions:
Interested:
Comments:
Note that this code as written only works with default radix of 10, otherwise the constants (123456789 and 32), get interpreted as hex numbers. Put a period in front (.123456789 and .32) to make it more idiot proof+
Code:
BIN2DEC MOVLW 0XFF MOVWF BIN1 MOVLW 0X04 MOVWF BIN2 MOVLW 0XFF MOVWF BIN3 MOVLW 0X04 MOVWF BIN4 MOVLW .32 ; 32-BITS MOVWF II ; MAKE CYCLE COUNTER CLRF DIGIT1 CLRF DIGIT2 CLRF DIGIT3 CLRF DIGIT4 CLRF DIGIT5 B2BCD2 LFSR FSR0,DIGIT1 ; MAKE POINTER MOVLW .5 MOVWF CNT ; MIKE'S ROUTINE: B2BCD3 MOVLW 0X33 ADDWF INDF0,F ; ADD TO BOTH NYBBLES BTFSC INDF0,3 ; TEST IF LOW RESULT > 7 ANDLW 0XF0 ; LOW RESULT >7 SO TAKE THE 3 OUT BTFSC INDF0,7 ; TEST IF HIGH RESULT > 7 ANDLW 0X0F ; HIGH RESULT > 7 SO OK SUBWF INDF0,F ; ANY RESULTS <= 7, SUBTRACT BACK INCF FSR0L,F ; POINT TO NEXT DECFSZ CNT GOTO B2BCD3 RLCF BIN4,F ; GET ANOTHER BIT RLCF BIN3,F RLCF BIN2,F RLCF BIN1,F RLCF DIGIT5,F ; PUT IT INTO BCD RLCF DIGIT4,F RLCF DIGIT3,F RLCF DIGIT2,F RLCF DIGIT1,F DECFSZ II,F ; ALL DONE? GOTO B2BCD2 ; NO, LOOP RETLW .0 ; yes+
file: /Techref/microchip/math/radix/b2bp-32b10d.htm, 6KB, , updated: 2013/2/9 12:06, local time: 2022/12/3 21:38, |
©2022 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/math/radix/b2bp-32b10d.htm"> PIC Microcontoller Radix Math Method Binary to BCD packed and ASCII, 32 bit to 10 digits</A> |
Did you find what you needed? |
PICList 2022 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! |
.