Data-Lines in Lib and Inline-Asseembler

Micha · Joined: 03 Oct 2006 Posts: 57

Hello

I use a registered Version of Bascom and my interrest is on programming assembler, too.

With Directive
.db
you can store Databytes in Inline-Assembler and Libs.

Is there a way to store Word, Long and String like this?

.dw wordvalue
.dl longvalue
.db "String",0

Or must i use basic-command like Data to do this?

In Lib
*Basic: Data "Hallo" ; for String
*Basic: Data 1%, &h10, $10 ; for numeric

And how can i dim variables and array in assembler?

(BASCOM-AVR version : 2.0.8.3 )

laborratte · Joined: 27 Jul 2005 Posts: 299 Location: Berlin

Micha · Joined: 03 Oct 2006 Posts: 57

If the compiler does not (yet) support it, it is clear that it does not work.

Thanks for the answer

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

for a custom project (6502 to avr) it was required to have .dw and .ds so the next update has this support :
.dw for integer/words
.ds for strings "abc"

no support for single/double/long/dword
but could be added if users like that.

to dim a var is not possible.
but you can access it using {}
lds r24,{myvar}

Micha · Joined: 03 Oct 2006 Posts: 57

Hello Mark

That would be great if double, long, single etc. were also supported.

Mitch

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

I still cant see the point in assigning high level data in assembler. Assembler has no direct commands for handling any form of data other than bytes. Anything else, you have to code subroutines for. So to get data to feed the subs, you can either just specify lists of bytes as .db statements, or use Bascom data statements to put in the high level numbers, then access them with the lds reg, {myvar} construction, or one of the ld indirect type commands. The whole point of being able to use asm within Bascom is to take advantage of both types of language, not to duplicate stuff which already exists.

MWS · Joined: 22 Aug 2009 Posts: 2262

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

i can see usage for long/dword.
but MWS and AdrianJ have good points for single/double.
So before doing that, send some example where it would be required that you can access this data.

MWS · Joined: 22 Aug 2009 Posts: 2262

hgrueneis · Joined: 04 Apr 2009 Posts: 902 Location: A-4786 Brunnenthal

Prior to Bascom, I did among others a lot of assembly language, it was the times, but with the Bascom compiler there
is not a lot to gain (maybe in some cases). So, in my opinion, take Bascom or do assembly and be happy, because you spend a year to do the same as Bascom does in ten minutes.
Just my two bits.
Have fun.

Regards
Hubert

AdrianJ · Joined: 16 Jan 2006 Posts: 2483 Location: Queensland

I agree with hgruensis.

In 20+ years of using both ASM and Bascom, I only found a couple of cases where ASM was significanty faster than Bascom. Now that Bascom has direct use of the registers to save intermediate values, rather than save and load from SRAM, even that time saving is mostly moot.

The only time I got significant saving was one case doing very complex bit-twiddling across a big byte array. Anything using 'ordinary' high level structures like words and longs, the savings are negligible. Bascom routines are VERY efficient - thanks to Mark.

If all you want is to save a bit of effort in writing dw instead of db,db then I cant see the point. You could just as easily use something like Visual Basic on a PC to do a 'translation' of any list of variables in any format you like into a list of .db statements, then insert that into the code.

MWS · Joined: 22 Aug 2009 Posts: 2262