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\marlinui_DOGM.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!

[TUR106]

radek8

Hi, friend. Can you help me connect BTT SKR Mini E3 V2.0 with BTT Mini12864 v1.0.
I uploaded your file to Marlin 2.1.2.1 - pins_BTT_SKR_MINI_E3_common.zip. I connected according to this diagram.

The image appears, menu works well, but the backlight does not work.

After I uncommented and corrected the lines.
#define NEOPIXEL_LED
#if ENABLED(NEOPIXEL_LED)
#define NEOPIXEL_TYPE NEO_RGB
It gives errors when compiling and I don't know how to fix them.

edited files.zip

[radek8]

@TUR106
Can you send the error message?

[TUR106]

@TUR106 Can you send the error message?

.pio\libdeps\STM32F103RC_btt_USB_maple\Adafruit NeoPixel/Adafruit_NeoPixel.h:377:3: error: 'GPIO_TypeDef' does not name a type
GPIO_TypeDef *gpioPort; ///< Output GPIO PORT
^~~~~~~~~~~~
*** [.pio\build\STM32F103RC_btt_USB_maple\src\src\gcode\queue.cpp.o] Error 1
In file included from Marlin\src\gcode\sd../../feature/leds/neopixel.h:38:0,
from Marlin\src\gcode\sd../../feature/leds/leds.h:39,
from Marlin\src\gcode\sd../../feature/leds/printer_event_leds.h:28,
from Marlin\src\gcode\sd\M1001.cpp:47:
.pio\libdeps\STM32F103RC_btt_USB_maple\Adafruit NeoPixel/Adafruit_NeoPixel.h:377:3: error: 'GPIO_TypeDef' does not name a type
GPIO_TypeDef *gpioPort; ///< Output GPIO PORT
^~~~~~~~~~~~
*** [.pio\build\STM32F103RC_btt_USB_maple\src\src\gcode\sd\M1001.cpp.o] Error 1

[radek8]

How did you configure Marlin?
Many users make the mistake of downloading configuration files from some site. He then copies these into the Marlin directory, which he downloaded from another repository in different versions than the configuration files he used.
Compilation then ends with errors because the compiler cannot find variables that may have been renamed in different versions.

[radek8]

radek8

Hi, friend. Can you help me connect BTT SKR Mini E3 V2.0 with BTT Mini12864 v1.0. I uploaded your file to Marlin 2.1.2.1 - pins_BTT_SKR_MINI_E3_common.zip. I connected according to this diagram.

You may not copy the configuration files from this thread to the current version of Marlin!

[TUR106]

radek8
Hi, friend. Can you help me connect BTT SKR Mini E3 V2.0 with BTT Mini12864 v1.0. I uploaded your file to Marlin 2.1.2.1 - pins_BTT_SKR_MINI_E3_common.zip. I connected according to this diagram.

You may not copy the configuration files from this thread to the current version of Marlin!

That's exactly what I did. I copied the configuration file into the current version of Marlin.
Compilation proceeds without problems until I activate the line #define NEOPIXEL_LED

Which version of Marlin should I download for the configuration file to work?

[radek8]

Never do not copy files from other versions of Marlin.
Use the default files and edit the necessary lines.
Why did you copy files from this page?
What was your problem?

[TUR106]

Nikfy do not copy files from other versions of Marlin. Use the default files and edit the necessary lines. Why did you copy files from this page? What was your problem?

I bought a board and a screen with a special cable. But the screen didn't work at all. There was no image and no backlight.

[radek8]

The cable you bought is not for this display.
Use your own cable from this thread and the configuration for this display. However, you must not copy files from another version of Marlin.

[radek8]

Which version of Marlin should I download for the configuration file to work?

You don't need to copy the file.
The display must also work in the new version Marlin

[TUR106]

Which version of Marlin should I download for the configuration file to work?

You don't need to copy the file. The display must also work in the new version Marlin

I installed clean Marlin 2.1.2.1. And I didn’t change any files. I only edited native files.
And I just edited:

Configuration.h

90 #define MOTHERBOARD BOARD_BTT_SKR_MINI_E3_V2_0

101 #define SERIAL_PORT 2

114 #define BAUDRATE 115200

123 #define SERIAL_PORT_2 -1

162 #define X_DRIVER_TYPE TMC2209
162 #define Y_DRIVER_TYPE TMC2209
163 #define Z_DRIVER_TYPE TMC2209
175 #define E0_DRIVER_TYPE TMC2209

2833 #define BTT_MINI_12864_V1

Commented in file pins_BTT_SKR_MINI_E3_common.h - 278 line:

Marlin-2.1.2.1\Marlin\src\pins\stm32f1\pins_BTT_SKR_MINI_E3_common.h

278 //#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.)"

After that I compile the firmware. The image and menu work, but there is no backlight.

[TUR106]

I connect the board and screen according to the following diagram (as indicated in this topic):

or

[TUR106]

When I activate NEOPIXEL_LED, and Correcting NEO_RGB:

3294 #define NEOPIXEL_LED
3295 #if ENABLED(NEOPIXEL_LED)
3296 #define NEOPIXEL_TYPE NEO_RGB

When compiling, it produces the same errors as before.

What am I doing wrong?

[radek8]

Can you send me your config files and both pin files?

[TUR106]

Can you send me your config files and both pin files?

Files.zip

[radek8]

Can you try this modified pins_BTT_SKR_MINI_E3_V2_0.h file?

pins_BTT_SKR_MINI_E3_V2_0.zip

[TUR106]

Can you try this modified pins_BTT_SKR_MINI_E3_V2_0.h file?

pins_BTT_SKR_MINI_E3_V2_0.zip

[TUR106]

Can you try this modified pins_BTT_SKR_MINI_E3_V2_0.h file?

pins_BTT_SKR_MINI_E3_V2_0.zip

With my files, does the compilation complete successfully on your computer?

[radek8]

I have a different version of the Marlin, a different SKR and a different display.
I can try to click on your configuration and compile.

[TUR106]

I don’t understand why only I have this problem when compiling? My brain is already exploding. Out of nerves, I ordered another set of board and screen...

[radek8]

I used a 20 hour old version of Marlin.
I am getting the same error.

[TUR106]

I am not an expert in this topic. but others had no problems. Is there any way to force the backlight to turn on? I'm not interested in changing colors. The main thing is that the image is visible.

[radek8]

Unfortunately. I probably can't help you with that

[TUR106]

friend, thanks for your time. and for your attention. I will continue to look for a solution. If I find anything, I'll let you know.

[TUR106]

К сожалению. Я, наверное, не смогу тебе с этим помочь

Hi, friend. I chose Marlin bugfix 2.1.x. And I did the compilation through Auto Build Marlin - STM32F103RC_btt_USB (256).
And it compiled the firmware without red errors.

But after updating the board firmware... the backlight did not appear.

fantastic))))

[radek8]

Also try enabling this option.
define LED_USER_PRESET_STARTUP
define LED_COLOR_PRESETS

[TUR106]

Also try enabling this option. define LED_USER_PRESET_STARTUP define LED_COLOR_PRESETS

In general, everything worked out. What I've done:
Downloaded pure marlin 2.1.2.1. Replaced configuration files from:
Configurations-release-2.1.2.1\config\examples\Creality\Ender-3\BigTreeTech SKR Mini E3 2.0

Configuration.h activated the lines:
BTT_MINI_12864_V1

NEOPIXEL_LED,
line 3297 changed to: #define NEOPIXEL_TYPE NEO_RGB

Configuration_adv.h activated the lines:
LED_CONTROL_MENU,
LED_USER_PRESET_STARTUP,
LED_COLOR_PRESETS

I connected the display according to the diagram as in my pictures above.

Compiled this option

And I’m shocked - everything worked today... And the new screen also arrived today :))))))