Interesting. Be sure to report back after a while to confirm whether or not the series termination resistors solved your garbled display problem. I'd try the fix myself, but I've eliminated the...
Type: Posts; User: printbus
Interesting. Be sure to report back after a while to confirm whether or not the series termination resistors solved your garbled display problem. I'd try the fix myself, but I've eliminated the...
Evolution of Marlin took a different approach to the garbled LCD screens that negates the need for the fix proposed here. I don't know when it was changed in Marlin, but the Sept 28 2014 MakerFarm...
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...
Looking good. Should someone want to add the display auto-recovery, here's the change. In file ultralcd.cpp, look for...
#ifdef ULTIPANEL
static void lcd_return_to_status()
{
...
You could be right. I just figured that if I got one surplus in 2004, they were likely out at least 5 years prior to that. Digging into my displays box, I now see one of them that I bought at the...
Aw, man. I guess I should have known better than to gloss over details. State of the RS (register select) pin when the E pin is strobed is how the LCD module differentiates commands from data. At...
On to the i2c or i^2c stuff. For the unfamiliar reader, a simple overview first.
The larger Atmel AVR microcontrollers support a serial transfer over what Atmel calls the two-wire interface, or...
The display modules DO have 8 data lines, but the controller chip supports a data transfer mode that only uses four of them. The modules also have a read/write signal, but common applications don't...
To clarify for the interested, the interface involved with at least these display panels consists of six dedicated pins on the Arduino processor. i2c isn't involved. SPI is ran to the panel on at...
Oh, what the heck. I have a firmware change uploaded to test. I'll post details after I run this a while to make sure there are no ramifications of the change and after I witness the display...
What I've seen so far in the code is pretty generic, thanks to the Hitachi controller chip and clones that pretty much every LCD uses. The Marlin code quickly leverages Arduino library stuff for the...
How prevalent is the problem of the Marlin LCD panel displaying garbled data? My MakerFarm 8-inch i3v does it once in a while - often enough to just be annoying.
Having written LCD interface...