Hello,
I've been using an earlier version of the 64128N GC BC 3LP displays. I could communicate to the display via SPI if I shorted J1 and J3 together. However with the later versions of the display I am receiving now, there is no J1 and J3 pads to short.
Can you confirm if the later versions also have SPI capability and if the jumper is no longer needed or if there is anything else that is needed to enable SPI communications? The exact part number of the new display that I have is - Displaytech 64128N GC BC_3LP 220109
I hope you can assist so that I can move the project forward.
There was a board layout optimization done on this module a couple of years ago and it looks like the "undocumented feature" you were using is no longer available.
Please review the serial schematic on this page: https://www.seacomp.com/product/graphic-lcd-display-64128n
Hi Terry,
Thanks for your answer. The manufacturer of the driver does document the SPI capability of the ST7565R chipset though.
After a little bit of work, I found that if you load a zero ohm resistor across R5 then SPI communications are enabled with this latest re-spin of your module.
Hopefully this will help others wanting to use SPI serial to drive the module.