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Oh I see. That completely makes sense. I didn't think about the fact I was reusing the buffer on each pass. It probably drew the first line in black and then all others in white so it is difficult to see it was correct. Thanks so much. I'll give it a try today but I am sure you're right. Dumb mistak...

Thanks for the response. I should have copied directly from my code as the array was properly defined there before. The only difference was I set an explicit boundary size for the array (16). I understand about duplex in SPI but I am not looking at the contents of the buffer after the call. I am loo...

I'm working on a project I'd like to productize eventually and wanted to understand the licensing, costs, leadtime, ... for the Z-Uno Module. I've emailed the address given a couple of times but so far no response (it's been at least a couple weeks). Is there a better way to get in contact with the ...

It could just be me but I'm struggling to get SPI.transfer(buffer,count) to work. I have SPI working in general and can successfully execute commands on the slave device (a display). I can set the screen color to whatever I like using either SPI.transfer(byte) or SPI.transfer(word) (16 bit color val...