UART?

Archiver

I need to interface a BS2-SX with a chip that requires a UART
interface. Does anybody know if the BS2-SX can emulate a UART (like
a 16550) ?
Code overhead is an issue but if basic functions can be accomplished
I would prefer to use one less chip.
Thanks
Eric [noparse]:)[/noparse][noparse]:)[/noparse][noparse];)[/noparse]

Archiver

At 02:40 PM 5/19/00 +0000, hackenheimer@y... promulgated:
>I need to interface a BS2-SX with a chip that requires a UART
>interface. Does anybody know if the BS2-SX can emulate a UART (like
>a 16550) ?
>Code overhead is an issue but if basic functions can be accomplished
>I would prefer to use one less chip.
>Thanks
>Eric [noparse]:)[/noparse][noparse]:)[/noparse][noparse];)[/noparse]

Eric -

The answer is YES - BUT:

You would LACK the following in whole or part:

Real-time interrupts/interruptability

Full functionality

Parallel mode data_bit processing

Stamp 2SX 16550
Full speed range potential (305.2<-->115.2 vs 50-128K Baud)

Full STOP BIT cability (7/8 bit vs 5,6,7,8 bit)

Full PARITY (EVEN/NONE vs. EVEN/ODD/NONE)


Notes:

Hardware programmable, or driven by a Processor
(PC, Embedded, standalone Atmel/PIC/,etc)

Other platforms have built-in UARTS; including the Microchip PIC

Other BASIC compilers/interpreters/translators are available,
if BASIC is your language of choice

You would GAIN:

Some flexibility (although much is programmable via the 16x50
registers)

Full reasonable speed BAUD range (as above)

NOT having to use QFP packaging

A sense of accomplishment

Undying gratitude from many who have intended to attempt this

Many have opted to use other processors, and some use the combination of a
PIC microprocessor, and the MEL PIC Basic software [noparse][[/noparse] www.melabs.com ].
This softwar is available in two versions, one which supports the Parallax
STAMP PBASIC I syntax, and one which support the Parallax STAMP PBASIC II
syntax. The MEL PIC Basic compiler can purchased from a number of different
vendors. I purchased mine from Chuck Hellebuyck (chuck@e...) at
ELProducts [noparse][[/noparse] www.elproducts.com ] at a substantially reduced price. I
believe it can also be order in Candada through Mark Hillier at HVWTech
<Mark@H...> [noparse][[/noparse] www.hvwtech.com ].

The MEL software is NOT freeware or shareware, although there are some
shareware/trialware products available for various Stamp platforms. Other
BASIC translators exist such a SBASIC by Steve Lundt. See the StampFAQ [noparse][[/noparse]
http://www.al-williams.com/wd5gnr/stampfaq.htm ] for more details.

Thanks again to Al Williams [noparse][[/noparse] www.al-williams.com/ ] for all of his support !

Note:

Although the MAX31xx looks like an interesting serial UART, I have yet to
be able to make it work with a Stamp. Use with a PIC microprocessors s/b
easy, but since most PICs can bit-bang a UART in software, and many have a
built-in UART, the use of that series of chips is limited. My own view is
they are best suited for native-mode SPI use. YMMV on that.

Regards,

Bruce

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