ASM routine for multiplication

[acid]

Hello
I have downloaded this routine from www.piclist.com
<a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank">http://www.piclist.com/cgi-bin/constdivmul.exe</a>
it multiplies 1.333 * int

; Round = no

; ALGORITHM:
; Clear accumulator
; Add input * 1 to accumulator
; Add input / 4 to accumulator
; Add input / 16 to accumulator
; Add input / 64 to accumulator
; Move accumulator to result
;
; Approximated constant: 1.32813, Error: 0.365716 \%

; Input: ACC0, 8 bits
; Output: ACC0 .. ACC1, 9 bits
; Code size: 16 instructions

; cblock
; ACC0
; ACC1
; endc

;copy accumulator to temporary
movf ACC0, w


;shift accumulator right 2 times
clrc
rrf ACC0, f
clrc
rrf ACC0, f

;add temporary to accumulator
addwf ACC0, f

;shift accumulator right 2 times
rrf ACC0, f
clrc
rrf ACC0, f

;add temporary to accumulator
addwf ACC0, f

;shift accumulator right 2 times
rrf ACC0, f
clrc
rrf ACC0, f

;add temporary to accumulator
addwf ACC0, f
clrf ACC1
rlf ACC1, f

But I have problems. CCS not compile the code it return an error for clrc and cblock instruction
Can you help me ?
THANK!!
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514761

[Tomi]

clrc = Clear Carry
You can do this (16F877):
#define clrc bcf 0x03,0 in assembler
or
bit_clear(*0x03,0) in C

If you have another PIC (e.g. any 18F ) then check the address of the STATUS register.

You don't need cblock instruction. It reserves space for internal accumulators. Instead of this, declare ACC0 and ACC1 at the normal C part (e.g. char ACC0,ACC1; ). Then you can use these variables by names in assy parts.

:=Hello
:=I have downloaded this routine from www.piclist.com
:= <a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank"> <a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank">http://www.piclist.com/cgi-bin/constdivmul.exe</a></a>
:=it multiplies 1.333 * int
:=
:=; Round = no
:=
:=; ALGORITHM:
:=; Clear accumulator
:=; Add input * 1 to accumulator
:=; Add input / 4 to accumulator
:=; Add input / 16 to accumulator
:=; Add input / 64 to accumulator
:=; Move accumulator to result
:=;
:=; Approximated constant: 1.32813, Error: 0.365716 \%
:=
:=; Input: ACC0, 8 bits
:=; Output: ACC0 .. ACC1, 9 bits
:=; Code size: 16 instructions
:=
:=; cblock
:=; ACC0
:=; ACC1
:=; endc
:=
:=;copy accumulator to temporary
:= movf ACC0, w
:=
:=
:=;shift accumulator right 2 times
:= clrc
:= rrf ACC0, f
:= clrc
:= rrf ACC0, f
:=
:=;add temporary to accumulator
:= addwf ACC0, f
:=
:=;shift accumulator right 2 times
:= rrf ACC0, f
:= clrc
:= rrf ACC0, f
:=
:=;add temporary to accumulator
:= addwf ACC0, f
:=
:=;shift accumulator right 2 times
:= rrf ACC0, f
:= clrc
:= rrf ACC0, f
:=
:=;add temporary to accumulator
:= addwf ACC0, f
:= clrf ACC1
:= rlf ACC1, f
:=
:=But I have problems..Css not compile the code it return un error for clrc and cblock istruction
:=Can you help me ?
:=THANK!!
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514764

[acid]

ok!
It save 57 word in the my program!
THANKS

:=clrc = Clear Carry
:=You can do this (16F877):
:=#define clrc bcf 0x03,0 in assembler
:=or
:=bit_clear(*0x03,0) in C
:=
:=If you have another PIC (e.g. any 18F ) then check the address of the STATUS register.
:=
:=You don't need cblock instruction. It reserves space for internal accumulators. Instead of this, declare ACC0 and ACC1 at the normal C part (e.g. char ACC0,ACC1; ). Then you can use these variables by names in assy parts.
:=
:=:=Hello
:=:=I have downloaded this routine from www.piclist.com
:=:= <a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank"> <a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank"> <a href="http://www.piclist.com/cgi-bin/constdivmul.exe" TARGET="_blank">http://www.piclist.com/cgi-bin/constdivmul.exe</a></a></a>
:=:=it multiplies 1.333 * int
:=:=
:=:=; Round = no
:=:=
:=:=; ALGORITHM:
:=:=; Clear accumulator
:=:=; Add input * 1 to accumulator
:=:=; Add input / 4 to accumulator
:=:=; Add input / 16 to accumulator
:=:=; Add input / 64 to accumulator
:=:=; Move accumulator to result
:=:=;
:=:=; Approximated constant: 1.32813, Error: 0.365716 \%
:=:=
:=:=; Input: ACC0, 8 bits
:=:=; Output: ACC0 .. ACC1, 9 bits
:=:=; Code size: 16 instructions
:=:=
:=:=; cblock
:=:=; ACC0
:=:=; ACC1
:=:=; endc
:=:=
:=:=;copy accumulator to temporary
:=:= movf ACC0, w
:=:=
:=:=
:=:=;shift accumulator right 2 times
:=:= clrc
:=:= rrf ACC0, f
:=:= clrc
:=:= rrf ACC0, f
:=:=
:=:=;add temporary to accumulator
:=:= addwf ACC0, f
:=:=
:=:=;shift accumulator right 2 times
:=:= rrf ACC0, f
:=:= clrc
:=:= rrf ACC0, f
:=:=
:=:=;add temporary to accumulator
:=:= addwf ACC0, f
:=:=
:=:=;shift accumulator right 2 times
:=:= rrf ACC0, f
:=:= clrc
:=:= rrf ACC0, f
:=:=
:=:=;add temporary to accumulator
:=:= addwf ACC0, f
:=:= clrf ACC1
:=:= rlf ACC1, f
:=:=
:=:=But I have problems..Css not compile the code it return un error for clrc and cblock istruction
:=:=Can you help me ?
:=:=THANK!!
___________________________
This message was ported from CCS's old forum
Original Post ID: 144514777