; From Regulus Berdin; untested ; Input - ASCII number in W ; Output - binary in W sublw '9' movlw 'A' - .10 skpnc movlw '0' subwf ASCII,w
Tracy Smith says:
If you KNOW that the ASCII is '0'-'9','A'-'F' then a simpler solution for the midrange pics is:addlw -'A' skpc addlw 'A' - 10 + '0' addlw 10
If the ASCII value is in ram, then this solution will work for the 12 bit core too:movlw -'A' btfsc ASCII,6 movlw -'0' addwf ASCII,f ;(or w)
I think the correct conversion code from Tracy Smith should read : addlw -'A' ; expect upper case letters skpc addlw 'A' - 0x18 -'0' addlw 0x11+
| bcf 0x00,5 | movlw 0xC9 | addwf 0x00,f | movlw 0x27 | btfss 0x03,0 | addwf 0x00,f | return+
Peter Heinrich Says:
+;; Converts an ASCII character code (in W) into the integer value ;; corresponding to the hexadecimal digit it represents. '0'-'9' ;; become 0x0-0x9; 'A'-'F' and 'a'-'f' become 0xa-0xf. (This routine ;; expects W to contain only valid hexadecimal digits.) The result ;; is returned in place in W. ;; char2int: ; Shift the character. addlw 0x9f bnn adjust ; if positive, character was 'a' to 'f' addlw 0x20 ; otherwise, shift to next range of digits bnn adjust ; if now positive, character was 'A' to 'F' addlw 0x7 ; otherwise, character must have been '0' to '9' adjust: addlw 0xa ; shift the result to account for the alpha offset andlw 0xf ; clamp the value to one nybble return
This one does not care if the A-F is upper or lower case:+
hex2bin ; expects '0'-'9','A'-'F','a'-'f' in W btfsc WREG,6 ; not all PICs can do this... addlw 9 ; that's A-F (0x4? or 0x6?) andlw 0x0F ; we need only the low nibble return
Yes, that's 3 instructions + the return :-)
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