SV: [basicstamps] Re: Led display using basic stamp (is that possible?)
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Posts: 46,084
Greetings!
I would say that the MAX7219, together with a BS2P would be the best
bet.
The BS2P allows you to store DATA like bitpatterns in unused Program
banks, saving valuable room for your program.
A complete map of each character will take 5Bytes for each, but that
would mean a 'vertical' mapping or bit-stuffing since the characters are
5bits wide.
Setting up 8Bytes for each character, though, allows you to use assorted
tricks like taking the 8bit ASCII value, shifting it 3 bits to the left
and using that as a pointer to the correct bitmap.
A page is 2KB, so in theory it should be able to store 256 characters
and symbols that way.
(and if you use several program pages, you could have alternate
character or symbol sets, too)
:-)
Trygve
Opprinnelig melding
Fra: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=mpcGloSB5zEDXy9QS9ywGaAM9_lCiMTamiqHdjFqsscEoGyKLlmFkS_S_9wIKhlTdYuHK0u3IWiQp7eFxsiKA-v8cIms]allan.lane@h...[/url
Sendt: 16. februar 2004 22:35
Til: basicstamps@yahoogroups.com
Emne: [noparse][[/noparse]basicstamps] Re: Led display using basic stamp (is that
possible?)
The MAX7219 can drive 64 discrete LED's
each chip, and they do the scan and
current limiting themselves. If you
were doing one chip per character,
this could be a good solution. That
would be 20 chips, but somebody still has to
load the bit patterns. If you stored the
bit patterns in EEPROM, the BS2 could
support this.
I would say that the MAX7219, together with a BS2P would be the best
bet.
The BS2P allows you to store DATA like bitpatterns in unused Program
banks, saving valuable room for your program.
A complete map of each character will take 5Bytes for each, but that
would mean a 'vertical' mapping or bit-stuffing since the characters are
5bits wide.
Setting up 8Bytes for each character, though, allows you to use assorted
tricks like taking the 8bit ASCII value, shifting it 3 bits to the left
and using that as a pointer to the correct bitmap.
A page is 2KB, so in theory it should be able to store 256 characters
and symbols that way.
(and if you use several program pages, you could have alternate
character or symbol sets, too)
:-)
Trygve
Opprinnelig melding
Fra: Allan Lane [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=mpcGloSB5zEDXy9QS9ywGaAM9_lCiMTamiqHdjFqsscEoGyKLlmFkS_S_9wIKhlTdYuHK0u3IWiQp7eFxsiKA-v8cIms]allan.lane@h...[/url
Sendt: 16. februar 2004 22:35
Til: basicstamps@yahoogroups.com
Emne: [noparse][[/noparse]basicstamps] Re: Led display using basic stamp (is that
possible?)
The MAX7219 can drive 64 discrete LED's
each chip, and they do the scan and
current limiting themselves. If you
were doing one chip per character,
this could be a good solution. That
would be 20 chips, but somebody still has to
load the bit patterns. If you stored the
bit patterns in EEPROM, the BS2 could
support this.