Garbled LCD screens

[JimG]

Sorry to bring up an old thread. But I'd like to know how well this fix has worked?I've been fighting this problem for years on other projects.Jim

[printbus]

Sorry to bring up an old thread. But I'd like to know how well this fix has worked?I've been fighting this problem for years on other projects.Jim

I've used the trick maybe twice to recover from a garbled screen since I made the firmware change. Although the screen isn't readable when it occurs, I just hit the button on the smart panel and let Marlin time out and return to the main menu to reinitialize the display interface. I haven't described it in my MakerFarm i3v build thread yet, but I've also added a bezel over the LCD. I learned in other projects a long time ago that having these type of LCDs behind a bezel can do wonders in protecting them from going nuts after inadvertent static discharge.

As I update other projects using the LCDs in 4-bit transfer mode, I'll be looking for ways that I can automatically do the interface reinitialization periodically now that I understand how the data nibbles can get out of sync.