SPI Buffer Saver
SPX-14973
The SPI Buffer Saver is a hardware solution to an interesting problem. In short the standard Arduino
SPI library includes a method to transfer out an array (or buffer) but the contents are replaced by
whatever data is on the MOSI line at that time. This is problematic when using the SPI hardware to
control things like displays or addressable LED strips because it requires you to re-set the data in
the array each time. You can read more about the inspiration for this board here.
The BufferSaver is an extremely compact board designed to sit in series with the power and data
lines going to an LED strip or any other one-way SPI interface. A tri-state buffer is used to connect
the MOSI and MISO lines when activated so that you can circumvent the Arduino library
implementation of SPI.transfer() that would otherwise overwrite your data.
Eliminating the step of re-writing LED or pixel data always increases efficiency and can as much as
double your frame rate or maximum number of pixels in ideal situations!
We do not plan to regularly produce SparkX products so get them while they’re hot!
Experimental Product: SparkX products are rapidly produced to bring you the most cutting edge
technology as it becomes available. These products are tested but come with no guarantees. Live
technical support is not available for SparkX products. Head on over to our forum for support or to
ask a question.
FEATURESDOCUMENTS
10 MHz maximum bitrate
5.5V maximum supply voltage
Small form factor
o 12.6 x 18.2 x 3.0 mm standard
o 12.6 x 10.3 x 3.0 mm compact (cut off on dashed line)
https://www.sparkfun.com/products/14973/12‐3‐19
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