BTT SKR MINI E3 V2 with BTT MINI12864 V1.0 - only backlight working

[Legiotech]

Hi I'm trying to connect SKR MINI V2 with Mini12864, but best I can get is backlight working. I've made a custom cable to connect display to the board - then i checked 10 times if i made it right (according to #650/info in Marlin files). I have also followed recomendations for commenting/uncommenting different lines from #650 topic. I have set the contrast in _Marlin\src\lcd\dogm\marlinuiDOGM.cpp to 255: void MarlinUI::_set_contrast() { u8g.setContrast(255); }

If I am correct my cable is working fine, otherwise i wouldn't get backlight (at least gnd, +5 and one more cable are fine). Do you know any way to make my screen work?

[radek8]

If I look at the pin file for your board, there is something I don't like...

[Legiotech]

I checked it and indeed there is two pins in mainboard, that are different than in Marlin files. Sadly i don't see any pins for PA9 and PA10 on mainboard. Does it mean that it won't work?

[radek8]

I didn't mean this. PA9 and PA10 is fine

I don't have the SKR mini E3 board, nor the BTT MINI12864 display. That's why I can't test the settings. Send me your configuration files and I'll try to suggest changes if you want to test them. configuration.h configuration_adv.h pins_BTT_SKR_MINI_E3_common.h

[radek8]

The swap is here

RX2 = PA3 TX2 = PA2 According to the pin file, it's the other way around.

[radek8]

Some pins ( PA9 , PA3) are defined twice. That won't be good either. I would try to comment on these items:

define LCD_PINS_RS PA9

define LCD_PINS_ENABLE PA3

define LCD_RESET_PIN PA10

[Legiotech]

Thank you very much! I made changes that you talked about and it's working fine!!!

[radek8]

Congratulations. That's great. So what have you changed? I would suggest changing it in Marlin so that it works for others and they don't have to look for a problem as well.

[Legiotech]

Modyfications in Marlin that I have done:

• In Marlin\src\lcd\dogm\marlinui_DOGM.cpp: void MarlinUI::_set_contrast() { u8g.setContrast(255); }
• Configuration.h: #define FYSETC_MINI_12864_2_1 - in line 2814

-pins (Marlin\src\pins\stm32f1\pins_BTT_SKR_MINI_E3_common.h): after #elif ENABLED(FYSETC_MINI_12864_2_1) i've added #define NO_CONTROLLER_CUSTOM_WIRING_WARNING and i've commented three lines:

    //#define LCD_PINS_RS                     PA9     // CS
    //#define LCD_PINS_ENABLE                 PA3     // MOSI
    #define LCD_BACKLIGHT_PIN               -1
    #define NEOPIXEL_PIN                    PB8
    #define LCD_CONTRAST                    255
    //#define LCD_RESET_PIN                   PA10

From the Marlin files that was it i guess. In wiring i swapped two wires in TFT connector:

I think it was all. Thank you very much once again.

[radek8]

@Legiotech I suggested the Marlin modification. Thisiskeithb says no need to edit the file Marlin\src\lcd\dogm\marlinui_DOGM.cpp If no characters appear on the display, it is said that resetting the EEPROM is sufficient. Can you please compile Marlin without this modification and try it? Thank you

[Legiotech]

I have compiled Marlin without changes in marlinui_DOGM.cpp and as it was before, there was no characters on the screen. I have plugged the usb cable and tried to connect to the board using Pronterface, but it haven't worked. After that I've installed a driver from https://github.com/bigtreetech/BIGTREETECH-SKR-mini-E3/tree/master/firmware/mapleDrv-USBdriver and it haven't worked as well. I have also mount mainboard into the printer and it turned out that the screen work only when i power the board via usb (but it may be solved by reseting eeprom as Thisiskeithb said). When i power it from the usb and then turn on power supply it works fine and i can use screen normally.

[Sporkforce]

Hello, I am also trying to use the BTT Mini 12864 V1.0 on a BTT SKR Mini E3 V2.0. I am using the Marlin 2.0.8.2x SKR Mini E3 V2.0 Firmware and there is no

elif ENABLED(FYSETC_MINI_12864_2_1

Entry in Marlin\src\pins\stm32f1\pins_BTT_SKR_MINI_E3_common.h

Do I manually insert that entry along with

//#define LCD_PINS_RS PA9 // CS //#define LCD_PINS_ENABLE PA3 // MOSI

define LCD_BACKLIGHT_PIN -1

#define NEOPIXEL_PIN                    PB8
#define LCD_CONTRAST                    255
//#define LCD_RESET_PIN                   PA10

?

I'm no stranger to rewiring connectors or tweaking firmware, but for some reason I can't get my head around this one. Thanks for any help.

[Legiotech]

I had the same issue at first, so I decided to use Marlin 2.1.x and used WinMerge to rewrite configuration.h and configuration_adv.h. It was quite fast operation. I don't know if adding some lines by hand will help, but probably not. You can try it and report if it worked. BTW I still have problem with connecting via usb to the mainboard, I will try to solve it, but now I have to put it aside for a bit.

[Sporkforce]

I got Marlin 2.1.1 and updated its Config/Config_adv, along with the pins_BTT_SKR_MINI_E3_common.h and marlinui_DOGM.cpp. Havn't found anyone yet able to use USB connectivity though, after prowling the googles for a good bit. Otherwise everything is accounted for and seems ready to go, custom cable is made, but for the life of me I can't get it to compile. It claims the wrong board is defined in Configuration.h . I read this may be a platformio board definition mismatch but Im still in the process of tracking this issue down. Were you able to get your firmware compiled without any fuss?

[Legiotech]

Yes, I compiled my firmware without issues. I can't check my settings now, but if you won't solve the issue till wednesday I can check it for you. I was looking for some information about usb connection too and it seems to be not working.

[radek8]

@sporkforce, send the exact wording of the error. Send all the files you edited: configuration.h, configurtion_adv.h, pin file and more...

[Sporkforce]

Oh thanks! I used Winmerge to copy over the custom settings. The printer is a uniqe setup so misc sizes and hotend/thermistor/extruder wont match a typical Ender 3 or CR10 Full error message after attempt to compile: buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/../pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h:247:8: error: #error "CAUTION! FYSETC_MINI_12864_2_1 / MKS_MINI_12864_V3 / BTT_MINI_12864_V1 requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)" 247 | #error "CAUTION! FYSETC_MINI_12864_2_1 / MKS_MINI_12864_V3 / BTT_MINI_12864_V1 requires wiring modifications. See 'pins_BTT_SKR_MINI_E3_common.h' for details. (Define NO_CONTROLLER_CUSTOM_WIRING_WARNING to suppress this warning.)"
| ^~~~~ buildroot/share/PlatformIO/scripts/../../../../Marlin/src/inc/../pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h:315:2: error: #endif without #if 315 | #endif // HAS_WIRED_LCD | ^~~~~ Error: MOTHERBOARD is not defined in Configuration.h Marlin 2.1.1 Edited Files.zip

[radek8]

The error says that you have used a display that requires a special connection cable. You have made the cable, now you need to accept this warning and comment out this line in the pin file:

[radek8]

Attention! Your pin file appears to be corrupted.

define NO_CONTROLLER_CUSTOM_WIRING_WARNING

is the wrong definition.

It should be right

ifndef NO_CONTROLLER_CUSTOM_WIRING_WARNING

[radek8]

Use this pin file pins_BTT_SKR_MINI_E3_common.zip

Also check the cable connection there was a wiring error in the original pin file.

[Sporkforce]

@radek8 I appreciate the help! With your file it compiled just fine and I was able to flash the firmware without issue. The screen still doesnt work unfortunately. I attached a photo of the pinout I am using. The encoder LED Lights as does the LCD backlight, but the screen is completely blacked out by the LCD. I changed the contrast from 255 to 125, but the blacked-out LCD does not change.

@Legiotech I did get USB connectivity working with pronterface. I had to go into Device Manager, into "Ports (COM&LPT) and I found the STMicroelectronics Virtual COM Port that showed up when I connected the board. I went into "Properties" with a right click, and then to the "Port Settings" Tab at the top. I switched the Bits per Second from 9600 to 115200. It was detected in pronterface just fine after that. Verified connectivity by moving a stepper back and forth. I was not able to upload firmware to it via USB though.

[Sporkforce]

UPDATE: It is fully functional! I can't thank you guys enough. I had incorrectly put the RESET pin on Board Connector EXP1-4 to the Display's RESET pin EXP2-3 as seen in the previous post, It should go to LCD_RST EXP1-6. My final Pinout is as pictured. I also had forgotten to enable support for the Neopixel LED Driver on PB8 in Marlin 2.1.1 Configuration.h: Line 3267 //#define NEOPIXEL_LED

if ENABLED(NEOPIXEL_LED)

define NEOPIXEL_TYPE NEO_GRBW

Was changed to:

define NEOPIXEL_LED

if ENABLED(NEOPIXEL_LED)

define NEOPIXEL_TYPE NEO_RGB

Everything seem to be good, I'll test for a while and see. So far I'm thrilled. Thanks again

[Legiotech]

UPDATE: I have connected my screen as @Sporkforce showed in last post and now im after week of testing and all is working fine. When i wired my screen correctly even USB communication started to work. Thank you both very much for help!

[stilkata8888]

UPDATE: It is fully functional! I can't thank you guys enough. I had incorrectly put the RESET pin on Board Connector EXP1-4 to the Display's RESET pin EXP2-3 as seen in the previous post, It should go to LCD_RST EXP1-6. My final Pinout is as pictured. I also had forgotten to enable support for the Neopixel LED Driver on PB8 in Marlin 2.1.1 Configuration.h: Line 3267 //#define NEOPIXEL_LED #if ENABLED(NEOPIXEL_LED) #define NEOPIXEL_TYPE NEO_GRBW Was changed to: #define NEOPIXEL_LED #if ENABLED(NEOPIXEL_LED) #define NEOPIXEL_TYPE NEO_RGB

Everything seem to be good, I'll test for a while and see. So far I'm thrilled. Thanks again

i wired up like this dude and again i dont have anything on display every setting i change like him and still dont have display.Can someone help me ??

[radek8]

@stilkata8888 What version of the display and SKR do you have? What version of Marli do you have?

[stilkata8888]

@radek8 e3 v2

[stilkata8888]

and the version of the display is v1.0

[radek8]

BTT MINI12864 V1.0?

[stilkata8888]

yes !

[radek8]

Send me your Marlin configuration files that you used to compile. configuration.h configuration_adv.h pins_BTT_SKR_MINI_E3_V2_0.h pins_BTT_SKR_MINI_E3_common.h

[stilkata8888]

like zip files is it okay ?

[radek8]

ok

[stilkata8888]

files.zip there we go

[radek8]

I have to go, I'll check it out later.

[radek8]

The configuration looks fine. Check if you have cables connected to the management.

[stilkata8888]

i check the cables 5-6 times and its connected correctly to the display i only get backlight and nothing on the screen ;(

[radek8]

So you can still try to edit this file. And recompile.

V Marlin\src\lcd\dogm\marlinui_DOGM.cpp:

void MarlinUI::_set_contrast() { u8g.setContrast(contrast); }

Rewrite to

void MarlinUI::_set_contrast() { u8g.setContrast(255); }

[stilkata8888]

i edit this file and show me error.The error is:#error "Please select only one LCD controller option." and i can't compile it.

[radek8]

This modification should not cause this error. Haven't you made another adjustment yet?

[stilkata8888]

can the versions of the marlin can cause these errors ?

[radek8]

If you use all files of the same version, then no

[stilkata8888]

okay im gonna make the change you speak about and im gonna update you what happend.

[stilkata8888]

again the same nothing on display and no backlights 😞

[radek8]

@stilkata8888 I found one more error in your configuration. You have to enable it in Configuration.h

define NEOPIXEL_LED

and

define NEOPIXEL_TYPE NEO_GRBW

Was changed to:

define NEOPIXEL_TYPE NEO_RGB

[stilkata8888]

man its okay everything i fixed it the display is running up perfectly and everything is just fine.Later im gonna upload the things i edited in firmware.

[P1ayer2]

Hello all! After trying to use the BTT V1.0 12864 display on the newest marlin version (2.1.2) I discovered that the (Marlin-2.1.x-V1/Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h) file is completely different compared to the file referenced in this thread. I have found that DOGLCD_CS should be what was previously known as LCD_PINS_RS and DOGLCD_MOSI what was LCD_PINS_ENABLE. These had the PA9 and PA3 values respectively, and has been commented as it is supposed to be. However, I can not find the equivalent of LCD_RESET_PIN PA10. In fact, I can not find a PA10 command at all in this version. Is it something I should ignore? Have I commented the correct things otherwise? I am pretty new to marlin and I am doing a completely custom build so any help is much appreciated. Thanks in advance! // Navil.

[stilkata8888]

does your display is turning on ? Have you got something on the display ?

[P1ayer2]

does your display is turning on ? Have you got something on the display ?

Hey! Thanks for your reply. I haven't received the display yet, I'm just doing the configuration of the board right now to use directly after receiving it. Do you want be to reply once I have it and can test? It is hopefully arriving this Monday.

EDIT: I now realize that my OG comment made it seem like I had it already. Sorry for being unclear.

[stilkata8888]

which board are you using for your build ?

[P1ayer2]

I am using the BTT SKR MINI E3 V2.0 for my rebuild with the BTT Mini 12864 V1.0 Display as mentioned before :D

[stilkata8888]

okay im gonna make u shematic of wiring and im gonna tell you which things u need to change in the firmware to make the display work :)