Kent Display SPI Timing

[jonathan]

Hey everyone - I have one of these Kent Displays from SparkFun.

http://www.sparkfun.com/commerce/produc ... ts_id=9560

I'm currently trying to interface it to an XMOS chip.

After some work, I think I'm generating the right SPI signals at a manageable frequency. I've probed all the connections for power/ground etc, but don't have a scope yet so it's hard to check whether the SPI interface connections are doing the right thing.

If anyone has got these working, I'd greatly appreciate some help sanity checking these waveforms, so that I can eliminate "software" as a source of error and focus more attention onto the hardware.

I'm trying to output 0x12 as an SPI command, and the waveforms look right to me... yet the display does absolutely nothing. Please see the attached image.

Thank you all in advance for any help or advice.

[Berni]

Try to search for example code and look at the initialization sequence, some displays can be quite picky about it, also make sure you clock the SPI at a really low speed to eliminate any capacitance or speed limitation issues.