I'm trying to initialize this display,
http://www.ampdisplay.com/documents/pdf/AM-240320D5TOQW-T00H(R).pdfand can't seem to get a single bit out of it.
I've literally tried everything I can, with the pins that I have.
It seems to be a RM68050 controller, which in turn seems to be a copy and slight variant ("improved", but I'm guessing it's a Taiwanese copy at best, so I use the term loosely) of the ILI9325, which some of you probably have experience with on some display or another.
I have a breakout board, on which the D0-D17 pins are grounded, and all the other signals are set to VCC/GND per the datasheet instructions for SPI mode. (It happens to be very similar to the LPC17xx dev kit, which uses this display.)
One mode pin is terminated on the flex, not brought out to a connector: JP1. I have changed this per instructions.
I have SCL wired to display pin 34, MOSI to pin 12, MISO to pin 10, nCS to 31, and nRST to 32. That should be everything.
The datasheet doesn't spell it out, but I get the impression that it only responds if CS is asserted, and the first few bits shifted in match the ID bits in the header (i.e., 0x70 plus control bits). It's not clear what it's supposed to respond with, if anything, but a read instruction is supposed to return something after a maximum of six consecutive bytes.
Just in case I've swapped bit polarity, direction or phase, I've exhaustively tested all 256 possible START bytes. No effect, dead as a doornail.
What am I missing?
Tim