I2C LCD on RAMPS

R_Klauco

Hi, all.
I have RAMPS 1.4 up and running great with my ToyRep.
I have old 20x4 LCD with PCF8574.
I cannot get it to work for some reason.
What I changed:
In Configuration.h I've selected FEATURE_CONTROLLER to 1
In UI_CONFIG.h I've selected
DISPLAY_TYPE 3
UI_DISPLAY_I2C_CHIPTYPE 0
UI_DISPLAY_I2C_ADDRESS 0x27 (detected by i2c detect on the same HW)
and I've set all the I2C bits according my test sketch with Liquidcrystal_i2c library.
I have no buttons/keys/buzzer.
However, the display does not get initialized and the firmware "freezes" during start with only this text in serial console:
start

Info:External Reset

Transformation matrix: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000

Minimum Speed:3.94

Minimum Speed Z:0.14


When I set the FEATURE_CONTROLLER to 0, the firmware works OK but the LCD, of course, does not.
Any hints on how to setup such home-brew LCD?

UniversalRemonster

This section of the forums is for Tips and Tricks. I recommend you try the Display and Keyboard section of the forums here:

https://forum.repetier.com/categories/repetier-firmware-display-keyboard

Repetier

Maybe address should be 4e. We do not use the same as liquid crystal. I think ours is 2 * LQ address. If the I2C is not found firmware will hang and wait for response for ever.