Post by thread:[PIC]: binary to hex ascii conversion

I have been looking at the code on the piclist website for doing bin to hex ASCII conversion, and I'm sure there is a simpler way. I have seen some cunning code originally done for use on an 8080 or z80, and I was sure it was in the Scelbi 8080 cookbook that I have, but I cannot find it in there. It used the DC flag in a an extremely cunning way to detect the point at which you go from 9 to A in the sequence by using the DAA instruction, and used only about 5 or 6 8080 instructions without a single branch. I would like to try and convert it to a pic although the lack of a DAA instruction may not make this practical. Can anyone else remember the code segment I am talking about? It may have been in a z80 cookbook, or it could have been in a piece of Intel source code for the development system bios. It always looked such a nice piece of code that makes the common comparing to ASCII characters and doing jumps look extremely clumsy. I would appreciate getting hold of a copy of it if anyone has it. Thanks. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

Alan, I just checked the Scelbi 6800 and Z-80 cookbooks and couldn't find the code to which you refer. In fact, the main conversion routine for both books, is ASCII to BAUDOT (!). Cheers, Andrew ________________________________________________ Get your own "800" number Voicemail, fax, email, and a lot more http://www.ureach.com/reg/tag ---- On , Alan B. Pearce (spam_OUTA.B.PearceTakeThisOuTRL.AC.UK) wrote: > I have been looking at the code on the piclist website for doing bin to > hex > ASCII conversion, and I'm sure there is a simpler way. I have seen some > cunning code originally done for use on an 8080 or z80, and I was sure > it > was in the Scelbi 8080 cookbook that I have, but I cannot find it in > there. > > It used the DC flag in a an extremely cunning way to detect the point at > which you go from 9 to A in the sequence by using the DAA instruction, > and > used only about 5 or 6 8080 instructions without a single branch. I > would > like to try and convert it to a pic although the lack of a DAA > instruction > may not make this practical. > > Can anyone else remember the code segment I am talking about? It may > have > been in a z80 cookbook, or it could have been in a piece of Intel source > code for the development system bios. It always looked such a nice piece > of > code that makes the common comparing to ASCII characters and doing jumps > look extremely clumsy. > > I would appreciate getting hold of a copy of it if anyone has it. > > Thanks. > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:, [AD]: ->Ads > > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

You can do it several ways. I assume you want to display data as binary? Please be as specific as possible if you want useful help. I would probably do it a byte at a time. You can loop eight times, testing the last bit, output 0 if the last bit is 0, output 1 if 1, then shift the byte over one bit, repeat until you've looped eight times. That's the best I can think of until you are more specific about the circumstances of use. Jeff At 05:22 PM 1/17/02 +0000, you wrote: > >What do you mean with binary? > >Well I figure the contents of a register. For an instruction set I would be >looking at the 14 bit core. -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

1) Any question you might have, particularly on math/conversions, is PROBABLY already covered somewhere on the PICLIST site. Check the http://www.piclist.com software archives first, then ask here. 2) I've done it for you because that's just the kind of guy I am. Check this: http://www.piclist.com/techref/microchip/math/radix/b2ah-8b2a-sd.htm --Andrew _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

On Thu, 17 Jan 2002, Alan B. Pearce wrote: > I have been looking at the code on the piclist website for doing bin to hex > ASCII conversion, and I'm sure there is a simpler way. I have seen some > cunning code originally done for use on an 8080 or z80, and I was sure it > was in the Scelbi 8080 cookbook that I have, but I cannot find it in there. You mean when you saw this: http://www.piclist.com/techref/microchip/math/radix/b2ah-8b2a-sd.htm you really wanted something better? You can shave 2-cycles off of this if you use a temporary register. Scott -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

>You mean when you saw this: Yes I had looked at that, and on thinking it through after posting came to the conclusion that it probably is not possible to really improve on it. It was that the 8080 code fragment I remembered was so neat that I went looking for it. The problem with trying to use it on the PIC is that the PIC does not have a DAA instruction and the effort involved in emulating it would make such a mess of the PIC code that it would not be worth trying. -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Do you have something like this in mind (don't know any Z80 DAA tricks ;-): ;; w contains binary nybble (0..15) addlw 256-10 ; set C if w is 0A..0F -> w is 0..5 for 0A..0F btfss STATUS,C addlw '0' + 10 - 'A' addlw 'A' ;; w contains ASCII digit The first addlw could be modified to trip the DAA mechanism on a Z80 or other processor (the DC would happen when you need it). Peter -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics