SX Microcontroller Radix Math Method

Binary to BCD unpacked 8 bit to 3 digits

From:

• spamwunnerful1@spam@ at msn.com shares this code:

  
   
  conv_high, mid and low contain the converted BCD components of a single $byte; the_val is the
  input value containing the hexidecimal value to be converted.
  
  #hundreds = #100
  #tens	  =  #10
  #ones	  =   #1
  
  
  bcd_conv 
  		clr	conv_low	zero out temp storage for new conversion
  		clr	conv_mid
  		clr	conv_high
  
  hun
  		stc			;set carry flag for test
  		sub	the_val,#hundreds  ;subtract and check flag
  		jnc	ten		; if =0, done with hundreds conversion
  		inc	conv_high	;carry is set, so inc high bcd byte
  		jmp	hun		;check again to see if over 200 in value
  
  ten
  		clc			;clear carry first (carryx)
  		add	the_val,#hundreds ;need to correct for underrun first
  ten_a		stc			;set carry flag for test
  		sub	the_val,#tens	;subtract and check flag
  		jnc	one		; if =0, done with tens conversion
  		inc	conv_mid	;carry is set, so inc middle bcd byte
  		jmp	ten_a		;check again to see if any more 10s value
  
  one
  		clc			;clear carry first (carryx)
  		add	the_val,#tens	;correct for underrun but in tens now.
  one_a		stc			;set carry flag for test
  		sub	the_val,#ones	;subtract and check flag
  		jnc	ascii_correct	;if =0, done with 1s conversion-prepare for ascii
  		inc	conv_low	;carry is set, so inc low bcd byte
  		jmp	one_a		;check again to see if any 1s left in value
  
  ascii_correct
  		clc			;adds $30 to each bcd digit for correct output to lcd
  		add	conv_high,#$30	;now should display on lcd correctly
  		clc			;since carryx, clear c
  		add	conv_mid,#$30
  		clc
  		add	conv_low,#$30
  
  		clc			;house cleaning clear the carry
  		clz			;clear the zero flag
  

Questions:

• spamwunnerful1@spam@ at cox.net asks:

  hehe, I see my code was posted (8bit to BCD unpacked 3 digits)
  and it's nice for the ego trip, but I converted from an old
  listing I found for the 8031 (I thought I mentioned that in
  the posting?). There is nothing new under the sun, and the old
  saying that 95% of all code is just borrowed is true.
  
  I had originally registered as I believe,as wunnerful2@qwest.net
  but don't quote me. I was in a war with screwest.net before
  they sold themselves to msn, and lost (royally trashed with
  dsl, and my dedicated modem at the CO being redirected to the
  highest paying INC!). Yeah I know, I'm whining and should get to the point- hehee, I don't remember my log in password,
  and to boot, which of the last 2 or 3 email addresses I used
  to log in with (wunnerful1@cox.net presently).
  
  If you need more info, let me know. Haven't used the SX for
  a project for the last few years (the one using the posted
  code was for a 16x2 readoutof oil pressure, water temp ect.
  for a GL1500). Thinking about doing a fuel injection system
  for an old Harley shovelhead, since the SX is fast enough
  to do the job...just wondering about external mem addressing,
  since internal mem can't hold the type of map required for
  such.
  
  Eric Swendson

  James Newton replies: You still get credit for finding the code, recognizing its value, translating it to the SX and, most important, sharing it! THANK YOU!

  You can recover your passcode just by registering again (use only your email address if you are pressed for time) and it will be emailed to you.

  I (we) ALWAYS need more info! (GRIN) Send everything you can, PLEASE!

  Thanks for all your support Eric, you have been a great help to this community. +

  +

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