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Discussion Groups | BasicX | SPI bus length?
Discussion forum for the BasicX family of microcontroller chips.
SPI bus length? - Tom Becker - Jul 13 13:48:06 2006
I have a dilemma: I need a fast compass in a complex motorized device
but the motor magnets (which move within the project as the project
moves over Earth) disturb the compass in a complex manner that would, I
expect, be very difficult to correct. I plan on mounting the compass on
an arm that would remove it from the motors.
The CMPS03 uses I2C; the V2Xe uses SPI. It appears that I2C signalling
can run some appreciable distance and should not be problematic over a
few feet, and I expect that slow, bit-banged SPI would be similar over
the same run. But what about the processor SPI bus? How much wire can
hang on it before the processor starts coughing?
Tom
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
but the motor magnets (which move within the project as the project
moves over Earth) disturb the compass in a complex manner that would, I
expect, be very difficult to correct. I plan on mounting the compass on
an arm that would remove it from the motors.
The CMPS03 uses I2C; the V2Xe uses SPI. It appears that I2C signalling
can run some appreciable distance and should not be problematic over a
few feet, and I expect that slow, bit-banged SPI would be similar over
the same run. But what about the processor SPI bus? How much wire can
hang on it before the processor starts coughing?
Tom
______________________________
Stellaris® MCU Family: New Parts, New Package, New Price.
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Re: SPI bus length? - Tom Becker - Jul 14 19:31:37 2006
> ... How much wire...
Answering myself, not much, apparently. I couldn't get a machine to
run with 14" of SPI bus on it. I'll need to use bit-banged SPI with
the V2Xe.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )
Answering myself, not much, apparently. I couldn't get a machine to
run with 14" of SPI bus on it. I'll need to use bit-banged SPI with
the V2Xe.
Tom
(You need to be a member of basicx -- send a blank email to basicx-subscribe@yahoogroups.com )