Interfacing NT7605-based LCD with MSP430

I've spent the last week or two trying to get my MSP430 to communicate with an NT7605-based LCD.

I found this post with a very similar problem: Debugging initialization of LCD with NT7605 driver I've followed every step of this post and even directly copied their code (adjusting the pin connections accordingly) but to no avail.

The specific LCD module I am using is NHD-C0220AA-FSW-FTW (datasheet: http://www.newhavendisplay.com/specs/NHD-C0220AA-FSW-FTW.pdf)

I have used a logic analyzer to verify that I am sending the correct data and that my pins are connected correctly, at least as far as I can tell.

At this point, I have attempted to verify everything that I could suspect to be wrong (incorrect voltage levels, incorrect pin assignments in software, in correct wiring, etc), and I don't really know what to try next.

If anyone has working initialization code along with a pinout that I could try to ensure that my device is not broken, that would be great!

• but to no avail .... what happens exactly? – jsotola Jul 8 '18 at 20:10
• Absolutely nothing haha. Adjusting the contrast pot has no effect on the screen. As was verified in the post that I linked, if the device is not initialized properly, the contrast pot will do nothing. – Andrew Hegman Jul 8 '18 at 21:31
• are you using 4-bit or 8-bit interface? .... this datasheet has more info than the one you posted on pages 24, 25 ... newhavendisplay.com/app_notes/NT7605.pdf – jsotola Jul 8 '18 at 23:19
• the post that you refer to uses 4-bit interface, but uses 8-bit wiring .... when using 4-bit interface, connect MSP430 data lines DB0-DB3 to display data lines DB4-DB7 – jsotola Jul 8 '18 at 23:24
• I have tried both 8-bit and 4-bit. My initial attempt was to use the 8-bit interface with a shift-register. I directly connected the wires to the LCD when I used the code that is in the post that I referred to. I did connect all 8 wires to the LCD, is that a problem? Should I ground DB0-DB3? – Andrew Hegman Jul 9 '18 at 14:33