Post by thread:Building Text Strings in 16F84

Hi all! I am new to PICs (like the 16F84 didn't give it away). I would like to be able to add a 5 digit number to a text string in memory. It seems to me I should be able to #DEFINE a string with 00.000 for the number, then replace it in memory. Problem is I have been unable to find the start of the string. Am I on the right path here? Are strings that strange or is it me? Thanks!! Tom

Not quite sure what you are talking about. Do you mean "append the conversion from binary to decimal ASCII of a number to a string in memory"? If you are trying to convert a binary number to a text ASCII string, see: http://www.piclist.com/faq under Routines, Math, Base conversions. PICs don't really do strings. They sort of do arrays (limited to a few hundred 8 bit values via IND and indexed by the FSR) and if you have an array that happens to be filled with ASCII values, you sort of have a string. If you place the result of your number conversion just after that array in memory, then you have appended it. But there are no string processing or IO functions unless you program the PIC in a higher level language like C. What are you really trying to accomplish? James Newton, PICList Admin #3 spam_OUTjamesnewtonTakeThisOuTpiclist.com 1-619-652-0593 phone http://www.piclist.com {Original Message removed}

> Van: Tom Wehn <.....tomwehnKILLspam@spam@EN.COM> > Aan: PICLISTKILLspamMITVMA.MIT.EDU > Onderwerp: Building Text Strings in 16F84 > Datum: maandag 6 maart 2000 4:11 > > Hi all! Hello Tom, > I am new to PICs (like the 16F84 didn't give it away). I would like to be > able to add a 5 digit number to a text string in memory. It seems to me I > should be able to #DEFINE a string with 00.000 for the number, then replace > it in memory. Problem is I have been unable to find the start of the > string. Am I on the right path here? Are strings that strange or is it me? It's You :-) a #DEFINE does not allocate any memory (in ROM or RAM), but tell's your assembler to replace the first string behind the #DEFINE by the second, wherever he find's it in the source-file. When you want to define som *constant* strings or numbers, you will have to use the "dt" opcode. Example: Label1 dt "Hello world",0 ; A Zero-terminated string (in the Program-ROM !) LabelA dt 123,'a',255 ;Multiple byte's (in the Program-ROM !) If you want to create a "template" number, and want to change it's content's, you will have to store all bytes one-by-one into the RAM-area. Regards, Rudy Wieser

>Not quite sure what you are talking about. Do you mean "append the >conversion from binary to decimal ASCII of a number to a string in memory"? > > >PICs don't really do strings. They sort of do arrays (limited to a few >hundred 8 bit values via IND and indexed by the FSR) and if you have an >array that happens to be filled with ASCII values, you sort of have a >string. If you place the result of your number conversion just after that >array in memory, then you have appended it. >What are you really trying to accomplish? I have an 8 channel AD converter, a couple of op amps and a LCD wired to make a Voltage, Current, and Watt monitor. So far I have written the serial interterface for the AD, 16 bit math, keyboard and LCD routines. And I owe it all the Piclist! All I want is to be able to build a string that reads "Starting Volts 12.345" in memory so I can scroll several lines of data up and down in the LCD. Now I am outputting a string and then the number. If I could change that to a series of continuous memory locations it would help. Thanks again! Tom

Just as I said, put the string in one place and start converting binary to ASCII decimal in the next location. I'd like to add your project to those listed at: http://www.piclist.com/projects Perhaps: http://www.piclist.com/wehnmeter ? Would you be willing to post the code and circuit description? --- James Newton .....jamesnewtonKILLspam.....geocities.com 1-619-652-0593 http://techref.massmind.org NEW! FINALLY A REAL NAME! Members can add private/public comments/pages ($0 TANSTAAFL web hosting) {Original Message removed}