LCD 2004 - Display rows out of order

[rysmith0315]

I'm using a 4x20 display and writing the string "1234567890123456789A1234567890123456789B1234567890123456789C1234567890123456789D"

This display shows:
1234567890123456789A
1234567890123456789C
1234567890123456789B
1234567890123456789D

Is this the expected behavior?

[DavidAntliff]

Hi @rysmith0315, uh, no that is not expected! I have never seen this interweaving of lines before. What's the exact part number of the LCD controller? I've tested this library against a few HD4470-based devices and never seen this happen. Do you see similar behaviour with any of the third-party Arduino libraries?

[rysmith0315]

It appears others have had this issue with the Arduino library as well.

https://forum.arduino.cc/t/4x20-lcd-hd47780-skips-line/42354

[DavidAntliff]

I haven't looked into in depth but I suspect it's to do with logic around adding automatic newlines - you will probably get better results if you set the cursor to the start of each line and write up to 20 characters at a time. Next time I'm using this library I'll take a closer look.