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Hello, I'm looking for a method to store 2 characters in 1 word, because I have not enough data flash memory. Normally you use: char *line1={"AaBbCc"}; // 1 character in 1 word This is possible: struct bytes { unsigned low_byte: 8; unsigned high_byte: 8;} ; struct bytes line2[3]={'A','a','B','b','C','c'};// 2 characters in 1 word However this makes text not so well legible and time consuming to program. Does somebody have a solution to store "AaBbCc" with 2 characters in 1 word? Thanks in advance! Wim de Haan Exendis B.V. W.J. de Haan P.O.box 56, 6710 BB Ede Keesomstraat 4, 6716 AB Ede The Netherlands. Tel: +31-(0)318 - 676305 mailto: URL: http://www.exendis.com

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You can use either of the assembler directives 'DCB' or 'DCBR' (note that 'DCBR' only applies to the 56800E processor). This will do what you want, but you should be aware that the standard C library functions like strcpy(), strlen(), strcat(), strcmp(), etc. will NOT work with these "packed" strings. If you want to have functions that perform these operations, you will have to write them yourself in assembler. Here is the section about the assembler directive 'DCB' from the CodeWarrior on-line manual: ------------------------------- DCB Define constant byte. [label] DCB arg[,arg,...,arg] Remarks The DCB directive allocates and initializes a byte of memory for each arg argument. The arg may be a byte integer constant, a single- or multiple-character string constant, a symbol, or a byte expression. The DCB directive may have one or more arguments separated by commas. Multiple arguments are stored in successive byte locations. If multiple arguments are present, one or more of them can be null (two adjacent commas), in which case the corresponding byte location will be filled with zeros. If label is present, it will be assigned the value of the runtime location counter at the start of the directive processing. Integer arguments are stored as is, but must be byte values (e.g. within the range 0-255); floating-point numbers are not allowed. Single- and multiple-character strings are handled in the following manner: Single-character strings are stored in a word whose lower seven bits represent the ASCII value of the character. Multiple-character strings represent words whose bytes are composed of concatenated sequences of the ASCII representation of the characters in the string (unless the NOPS option is specified; see the OPT directive). If the number of characters is not an even multiple of the number of bytes per DSP word, then the last word will have the remaining characters left-aligned and the rest of the word will be zero-filled. If the NOPS option is given, each character in the string is stored in a word whose lower seven bits represent the ASCII value of the character. Example TABLE DCB 'two',0,'strings',0 CHARS DCB 'A','B','C','D' ------------------------------- Here is the section about the assembler directive 'DCBR' from the CodeWarrior on-line manual: ------------------------------- DCBR Define constant with byte-order flip. DCBR expression Remarks The DCBR directive is useful for defining byte strings with byte-order flip. The byte-order flip allows C code to properly address the byte strings. This directive applies to the 56800E processor. ------------------------------- I hope this information is helpful for you. Regards, Art Johnson Senior Systems Analyst PMC Prime Mover Controls Inc. 3600 Gilmore Way Burnaby, B.C., Canada V5G 4R8 Phone: 604 433-4644 FAX: 604 433-5570 Email: http://www.pmc-controls.com -----Original Message----- From: Wim de Haan [mailto:] Sent: Thursday, November 14, 2002 7:47 AM To: Subject: Compressed characters for Metrowerks Codewarrior for DSP56F807 Hello, I'm looking for a method to store 2 characters in 1 word, because I have not enough data flash memory. Normally you use: char *line1={"AaBbCc"}; // 1 character in 1 word This is possible: struct bytes { unsigned low_byte: 8; unsigned high_byte: 8;} ; struct bytes line2[3]={'A','a','B','b','C','c'};// 2 characters in 1 word However this makes text not so well legible and time consuming to program. Does somebody have a solution to store "AaBbCc" with 2 characters in 1 word? Thanks in advance! Wim de Haan Exendis B.V. W.J. de Haan P.O.box 56, 6710 BB Ede Keesomstraat 4, 6716 AB Ede The Netherlands. Tel: +31-(0)318 - 676305 mailto: URL: http://www.exendis.com

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I think you can go 'Aa' (Ie., use single quotes around two characters) -----Original Message----- From: Wim de Haan [mailto:] Sent: Thursday, November 14, 2002 7:47 AM To: Subject: [motoroladsp] Compressed characters for Metrowerks Codewarrior for DSP56F807 Hello, I'm looking for a method to store 2 characters in 1 word, because I have not enough data flash memory. Normally you use: char *line1={"AaBbCc"}; // 1 character in 1 word This is possible: struct bytes { unsigned low_byte: 8; unsigned high_byte: 8;} ; struct bytes line2[3]={'A','a','B','b','C','c'};// 2 characters in 1 word However this makes text not so well legible and time consuming to program. Does somebody have a solution to store "AaBbCc" with 2 characters in 1 word? Thanks in advance! Wim de Haan Exendis B.V. W.J. de Haan P.O.box 56, 6710 BB Ede Keesomstraat 4, 6716 AB Ede The Netherlands. Tel: +31-(0)318 - 676305 mailto: URL: http://www.exendis.com _____________________________________ /groups.php3

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It appears that you can change the alingment boundary in the linker by using the . = ALIGN(bytes) command. This would require that you create a special section for you compressed strings, say .compressed_strings. It looks like that you will then need to have a seprate file just for your constant data that can be assigned in the linker file to the .compressed_strings section. If I have time later today I'll try it out myself. Jacob Christ www.pontech.com Motorola DSP Developemt Tools --- In motoroladsp@y..., Wim de Haan <w.d.haan@e...> wrote: > Hello, > > I'm looking for a method to store 2 characters in 1 word, because I have not > enough data flash memory. > > Normally you use: > char *line1={"AaBbCc"}; // 1 character in 1 word > > This is possible: > struct bytes { > unsigned low_byte: 8; > unsigned high_byte: 8;} ; > struct bytes line2[3]={'A','a','B','b','C','c'};// 2 characters in 1 word > > However this makes text not so well legible and time consuming to program. > Does somebody have a solution to store "AaBbCc" with 2 characters in 1 word? > > Thanks in advance! > Wim de Haan > Exendis B.V. > W.J. de Haan > P.O.box 56, 6710 BB Ede > Keesomstraat 4, 6716 AB Ede > The Netherlands. > Tel: +31-(0)318 - 676305 > mailto:w.d.haan@e... > URL: http://www.exendis.com

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Wim, I tried it, it doesn't work, although the maunal says that the ALIGN command will align to the byte, it only aligns to the word. Borland C++ Builder has a compiler pragma to do this, but I could find no such pragma in my Metorwerk DSP Compiler manual. Might be a good feature in the future, I'm not out of space (yet) so I can wait but you might start contacting MW. Jacob www.pontech.com Motorola DSP Developemt Tools --- In motoroladsp@y..., "Jacob Christ" <jacob@p...> wrote: > It appears that you can change the alingment boundary in the linker > by using the . = ALIGN(bytes) command. This would require that you > create a special section for you compressed strings, > say .compressed_strings. It looks like that you will then need to > have a seprate file just for your constant data that can be assigned > in the linker file to the .compressed_strings section. > > If I have time later today I'll try it out myself. > > Jacob Christ > www.pontech.com > Motorola DSP Developemt Tools > > --- In motoroladsp@y..., Wim de Haan <w.d.haan@e...> wrote: > > Hello, > > > > I'm looking for a method to store 2 characters in 1 word, because I > have not > > enough data flash memory. > > > > Normally you use: > > char *line1={"AaBbCc"}; // 1 character in 1 word > > > > This is possible: > > struct bytes { > > unsigned low_byte: 8; > > unsigned high_byte: 8;} ; > > struct bytes line2[3]={'A','a','B','b','C','c'};// 2 characters in > 1 word > > > > However this makes text not so well legible and time consuming to > program. > > Does somebody have a solution to store "AaBbCc" with 2 characters > in 1 word? > > > > Thanks in advance! > > > > > > Wim de Haan > > > > > > Exendis B.V. > > W.J. de Haan > > P.O.box 56, 6710 BB Ede > > Keesomstraat 4, 6716 AB Ede > > The Netherlands. > > Tel: +31-(0)318 - 676305 > > mailto:w.d.haan@e... > > URL: http://www.exendis.com

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