How to connect a 12864 screen to a Fly-E3

Wiring

The ender 3 stock display can be connected directly to the EXP1 header of the Fly-E3-v2. No modifications are required.

Board.txt modifications

The following lines should be added to the board.txt file. If you do not have a board.txt file in sys (the same location as config.g), create one using DWC.

lcd.encoderPinA=LCD_D4
lcd.encoderPinB=LCD_EN
lcd.encoderPinSw=BTN_ENC
lcd.lcdCSPin=LCD_D6
lcd.spiChannel=4
lcd.lcdBeepPin = BEEP

Config.g changes

Add the following line to the end of your config.g

M918 P1 E4 F1000000

Overview

The information here is aimed at connecting a RepRap 12864 display but it can also be applied to other 12864 displays (as long as they are ST7567 or ST7920 based).

Board.txt modifications

Add the following lines to the board.txt file.
If you do not have a board.txt file in sys (the same location as config.g), create one using DWC.

lcd.encoderPinA=BTN_EN2
lcd.encoderPinB=BTN_EN1
lcd.encoderPinSw=BTN_ENC
lcd.lcdCSPin=LCD_RS
lcd.spiChannel=5 
SPI5.pins = {PE_15, NoPin, PA_8}

Config.g changes

Add the following line to the end of your config.g

M918 P1 E4 F100000

Overview

The information here is aimed at connecting one of the following Mini 12864 Neopixel type displays.

Wiring

Connect EXP1 to EXP1 and EXP2 to EXP2.

Board.txt modifications

Add the following lines to the board.txt file. If you do not have a board.txt file in sys (the same location as config.g), create one using DWC.

//MINI 12864
lcd.encoderPinA=BTN_EN1
lcd.encoderPinB=BTN_EN2
lcd.encoderPinSw=BTN_ENC
lcd.lcdCSPin=LCD_EN
lcd.lcdDCPin=LCD_RS
lcd.spiChannel=0
//lcd.lcdBeepPin=NoPin

Config.g

Add the following line to the end of your config.g

M98 P"screen.g"

Add a file in your sys folder called screen.g and add the following contents

; ST7567 Init for Mini12864 Panel

; Configure Neopixel
M950 E0 C"LCD_D5" 
; Turn off backlight
M150 K0 R0 U0 B0 S3 F0
; Configure reset pin
M950 P1 C"LCD_D4" 
; hardware reset of LCD
M42 P1 S0
G4 P500
M42 P1 S1
; Turn display on
M918 P2 C30 F1000000 E4
; Fade in backlight
while iterations < 256
    M150 K0 R255 U255 B255 P{iterations} S1 F0
    G4 P20
; flash Button 3 times
while iterations < 3
    M150 K0 R255 U255 B255 P255 S1 F1
    M150 K0 R0 U255 B0 P255 S2 F0
    G4 P250
    M150 K0 R255 U255 B255 P255 S1 F1
    M150 K0 R0 U255 B0 P0 S2 F0
    G4 P250
; Display "ready" button state  
M150 K0 R255 U255 B255 P255 S1 F1
M150 K0 R255 U0 B0 P255 S2 F0

Menu files must be uploaded to allow the display to generate the correct information. This can be done in two ways. First, obtain the recommended menu files from here

Method 1 - WiFi Mode only

Extract the contents of the zip file you downloaded above and place them in a folder called “Menu” on the SD card of the Fly-E3-v2.

Method 2

Activate the display using the config.g changes above.
On the “System” tab, above the list of files, is a dropdown menu that defaults to “System Directory”. Select this and change it to “Menu Directory”.

Dropdown Menu
Dropdown Menu

Then upload the menu zip file.

Troubleshooting

If the screen is showing artifacts/random characters on the screen, the following may improve/eliminate the issue

  • Lower the SPI frequency by half. This is the F value in M918.
  • Reduce the length of the cable between the screen and the board.
  • Ensure that the cable between the screen and the board is routed away from other cables, especially motor cables.
  • Add a ferrite ring to the cable between the screen and the board.

Using the SD card slot on the screen

It is possible to use the external SD card.
To do so, add the following lines to your board.txt.
If you do not have a board.txt file in sys (the same location as config.g), create one using DWC.

sdCard.external.spiChannel=0
sdCard.external.csPin=LCD_SS
sdCard.external.cardDetectPin=LCD_CD
Tags: