SparkFun Forums

[julienb]

Hello,

I bought that:


datasheet is here:
http://www.sparkfun.com/datasheets/Comp ... ckpack.pdf


But I would like to know more about command I can send via spi to this board.

I mean!
how to reset it
how to change intensity
etc

can someone help me?
should I just look at atmega8 manuals?

[leon_heller]

The details you need are in the data sheet.

Leon

[julienb]

datasheet of the backpack?

[leon_heller]

Yes.

Leon

[julienb]

in this one, there isn't informations about that
http://www.sparkfun.com/datasheets/Comp ... ckpack.pdf
or it may be "crypted" in the document

it could be nice if someone tell me about that


I know how to reset max7221 led driver for example
but the only way for me with backpack is the reset switch

[leon_heller]

It's got the values you need to send via the SPI interface. What else do you need?

Leon

[julienb]

1/ how to reset the board via spi (without physically using switch)
2/ how to manage intensities (I guess that there only one intensity for all the matrix because no individual dimming provided)

at least these 2...


and, as i wrote up above, it isn't written.
I looked at Atmega8 datasheet :
p40/308, there is the external reset method.
low level on pin ~reset

but could we send a byte via spi to do that???


the *real question is:
could we have the avr code already dumped in the atmega8 ?
or should we use avr studio to get it ?!

[leon_heller]

It comes with the program already loaded.

There don't seem to be reset or dimming commands. You'd have to write those yourself.

Leon

[julienb]

okay.
I'd have to dive deeper in ICSP use in order to add a reset function