Hi, > I whas reading the German "das Fort magazin, vierte Dimension" and > find two interesting commands for manupulating on a simple way > individual bits with bset and bclr. > > Why are these not implemented in amForth?. Is thebsource for these > two available?
Within the core/words directory you can find three files: bm_set.asm bm_clear.asm and bm_toggle.asm which should do, what you expect (and they are compatible with the bitname.frt structures and are implemented in assembly for speed reasons). bm-set will set all bits at the specified RAM Address that are set in the bitmask. bm-clear will clear all thoses bit positions and bm-toggle, well you'll guess yourself ;) I prefer the bitmask over a bitnumber simply because it can deal with more bits in one operation. Expanding the bitmask to more than 8bits is a little bit dangerous since both the pure action of reading/writing and the order of the read/write operations may be important in some cases. The bclr and bset commands Michael mentioned are basically the same, but we could not (yet) agree on a common name.... HTH Matthias ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Amforth-devel mailing list for http://amforth.sf.net/ Amforth-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/amforth-devel
