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View code
5 digit BCD unpacked to 16bit binary in 33 inst
Author: Peter Hemsley
This code was originally located @ http://www.piclist.com
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; 5 digit decimal to 16 (17) bit binary. By Peter Hemsley, March 2003.
; Input decimal digits in D0 (LSD) to D4 (MSD)
; Output 16 bit binary in NUMHI and NUMLO
; No temporary variables required
; Code size: 33 instructions
; Execution time: 33 cycles (excluding Call and Return)
; Returns carry set if > 65535 (and NUMHI-LO MOD 65536)
dec2bin16
movf D1,W ; (D1 + D3) * 2
addwf D3,W
movwf NUMLO
rlf NUMLO,F
swapf D2,W ; + D2 * 16 + D2
addwf D2,W
addwf NUMLO,F
rlf D4,W ; + (D4 * 2 + D3) * 256
addwf D3,W
movwf NUMHI
rlf NUMLO,F ; * 2
rlf NUMHI,F
swapf D3,W ; - D3 * 16
subwf NUMLO,F
skpc
decf NUMHI,F
swapf D2,W ; + D2 * 16 + D1
addwf D1,W
addwf NUMLO,F
skpnc
incf NUMHI,F
swapf D4,W ; + D4 * 16 + D0
addwf D0,W
rlf NUMLO,F ; * 2
rlf NUMHI,F
addwf NUMLO,F
skpnc
incf NUMHI,F
movf D4,W ; - D4 * 256
subwf NUMHI,F
swapf D4,W ; + D4 * 16 * 256 * 2
addwf NUMHI,F
addwf NUMHI,F
return ; Q.E.D. |
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