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Convert the Hex digits to binary (16bits) and then convert the binary to ASCII.
Apply one of the "2 digit Hex to Binary 8 bits" routines to the first two hex digits and then again to the second, thereby producing two 8 bit values that are then passed to any one of the "16bit to ASCII Decimal 5 digits" routines. +
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+;some code snippets that someone might find useful... ;This routine will return the number of decimal ;hundreds from an 8-bit binary ;Input: w ;Output: w ;RAM:2 ;Cycles: 12-24 GETHNDS movwf t1 clrf w2 gethnds_loop movlw .100 incf w2,f subwf t1,f btfsc STATUS,C goto gethnds_loop decf w2,w return ;--- ;This routine will return the number of decimal ;tens from an 8-bit binary ;Loop based, so it might take some time... ;It needs getones too GETTENS movwf t1 clrf w2 gettens_loop movlw .10 incf w2,f subwf t1,f btfsc STATUS,C goto gettens_loop decf w2,w goto getones ;--- ;This routine will return the number of decimal ;ones from an 8-bit binary GETONES movwf w2 movlw .10 deltens_loop subwf w2,f btfsc STATUS,C goto deltens_loop addwf w2,w return
Code:
Compact and fast 10bit to BCD conversion for converting small / midrange PIC 10bit ADC ADRSH and ADRSL ;**************************************************** ;* 10bit BINARY to BCD * ;**************************************************** ; ;An implimentation of the 'Shift and add-3' Algorithm ; for small MicroChip 'PIC' microcomputers ; ;ALGORITHM ; ;1)Shift binary number one bit left (into a BCD 'result' ; (initially empty) ;2)If any 4 bit BCD column is greater than 5[hex] add 3[hex] ;3)Goto 1) {until the LSB binary bit is shifted out} ; ;<------MSB LSB-----> ;------------- BCD ------------] [------ binary ----- ; ; TENS UNITS ; BCD column BCD column MSB bit bit ; 0 0 0 0 0 0 0 0 1 0 1 ; ; <------ / <---/ <---/ ;Inalisation ;************** Processor 16F818 include <p16f818.inc> cblock 0x020 ;Define variable block starting at $020 binH ;bin is the 8bit binary value to be converted bin ;The 2bit binary MSB's to be converted bcdH ;Thousands (always blank)/ Hundreds nybbles bcdL ;Tens / Units nybbles counter temp endc _bin2bcd movlw d'8' movwf counter clrf bcdL clrf bcdH ;Save time by not shifting in first 6 bits (always '0's) ;-------------------------------------------------------- swapf binH,1 ;Chop off first nybble (TEN THOUSANDS) rlf binH,1 ;Shift out first 2 MSB's(always '0's) rlf binH,1 ;Ssave more ime by no test and add +3' for first TWO shifts ;--------------------------------------------------------------------- rlf binH,F ;Shifting 'binH' left through carry into BCD nybbles rlf bcdL,F rlf binH,F rlf bcdL,F ;binH (pic ADC register ADRESH) done with! ;Iteration loop shifts the 4 'columns' (10TH, THO, HUN, TEN, UNT) 1 bit left ;Tests each coulmn (4bit nybble) if > 5, adds '3' ;Shifts in the next MSB of the binary for conversion on the right. ;(for remaining EIGHT shifts) Next_bit movfw bcdL addlw 0x33 ;Add 3 to both nybbles (T/U) in 'temp' movwf temp movfw bcdL btfsc temp,3 ;Test MSB of Units+3 nybble in 'temp addlw 0x03 ;Add 3 to U nybble if units+3 MSB = 1 btfsc temp,7 ;Test MSB of Tens+3nybble in 'temp' addlw 0x30 ;Add 3 to T nybbleiftens+3 MSB=1 (>5) movwf bcdL movfw bcdH addlw 0x33 ;Add 3 to both nybbles (T/H) in temp mmovfw bcdH btfsc temp,3 ;Test MSB of Hundreds+3 nybble in temp addlw 0x03 ;Add 3 to H nybble if units+3 MSB=1 btfsc temp,7 ;Test MSB of Thousand+3 nybble in temp addlw 0x30 ;Add 3 to TH nybble if tens+3 MSB=1 movwf bcdH rlf bin,F ;Shift in next MSB from bin into T/UNITS rlf bcdL,F ;Shift next MSB from TENS/UNITS to TH/H rlf bcdH,F ;Shift up decfsz counter,F goto Next_bit return end+
file: /Techref/microchip/math/radix/index.htm, 17KB, , updated: 2019/8/26 09:43, local time: 2024/4/14 12:53, |
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