[sdiy] FV1, New Module pseudo DIY

[karl dalen]

A neat chip, but FV1 has some bizzare twist's to it, kind of being
both a Tortoise and a Hare at the same time! Starts out like a Hare, at
the finish line it suddenly transforms into the ultra slow Tortoise!

Don't take me wrong here, it sounds splendid, no doubt, great to learn DSP
on etc but it has this insane programmer/user interface. The non on the fly
programmability of the chip, this stiff I2C interface loading from EEPROM
which are the only way to change algorithms and oly 3 slow 9 bit CV inputs!

It appears strange that capable people like Keith and Frank could come up with such restrictive and inaccessible interface when the chip are
obviously splendid for processing sounds! They could have made it just
plain SPI! Data, CLK and a modified CS that selected in low state loading
into internal program RAM and in high state switchover to program
coefficient registers. This would free out many more pins for direct
coefficient control trough CV's or control of the coefficient registers trough SPI. This would had been a blast for many depending on app an
user. 

It was some talk about a followup device named DV-1 but that's
almost 3 years ago so i suppose it never made it trough!?

>double precision computations, but the hardware doesn't support this
>so you take a big hit in code complexity and throughput.

Other dedicated chips are the SAM 9707 etc, has plenty of horse power and are like the FV1 designed for DSP'ing but has a 16 bit control processor
on chip. They has been around since mid 90ies and was bought up by Atmel
at one point, they had dev boards and tool chain but back then in 97 it
was way to expensive, like TI range! Quasimidi based their entire
product range on these chips!

They have some new tasty 8 cores (24bit) on chip out nown, no idea 
what they cost. 

http://www.atmel.com/dyn/products/product_card.asp?part_id=3563
http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3930

Actually there was lot's of these kind of chips around all with plenty of DSP power but most was closed designs, hidden tools and only NDA's and if
you where not from a major mobile maker you had no chance!

Another chip that might be some kind of middle way between the FV1
and dsPic are the VS1000. A power full DSP core that can do general I/O
light leds, access external memory, talk over both its integrated Midi,
Rs232 , USB, SPI etc.

Tools seams to be free and simple like the one for the FV1 and
accessible to hobbyists?!

VS1053
http://www.vlsi.fi/en/support/evaluationboards/vs1000developerboard.html
http://www.vlsi.fi/en/support/evaluationboards/vs1000developerboard.html

KD


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