USB->SPI STM32_Mini12864 + Bigtreetech mini 12864 v2 = black display

[pasha4ur]

Hello

Please help me to fix this problem.

I need a long cable for display. Can't use EXP ports on main board with long cable bcs it produces error with registers in my SPI TMC2240.

I bought such board STM32_Mini12864 https://github.com/VoronDesign/Voron-Hardware/tree/master/STM32_Mini12864/  It's for FYSETC Mini 12864 Display but pinout looks like my Bigtreetech mini 12864 v2 This board uses STM32F042F6 microcontroller.

 

I flashed the STM32_Mini12864 board, wrote config for it (example) and successfully connected to it:

Quote

mcu menu(stm32f042x6)
Version: v0.12.0-114-ga77d0790
Load: 0.02, Awake: 0.00, Freq: 48 MHz,

My configuration for STM32_Mini12864:

 

[mcu menu]
# Uncomment serial and update with proper path
# Find serial path by running terminal command: ls /dev/serial/by-id/*
serial: /dev/serial/by-id/usb-Klipper_stm32f042x6_120008800543304846333520-if00 
restart_method: command

[display]
lcd_type: uc1701
kill_pin: !menu:PF0
spi_bus: spi1
cs_pin: menu:PA4
a0_pin: menu:PA2
rst_pin: menu:PA3
contrast: 63
encoder_pins: ^menu:PA0, ^menu:PA1
click_pin: ^!menu:PB1

## Alternatively, some micro-controller boards may work with software spi:
# I found these pins in the STM32F042x6 datasheet!
#spi_software_miso_pin: menu:PA6
#spi_software_mosi_pin: menu:PA7
#spi_software_sclk_pin: menu:PA5


[output_pin BEEPER_pin]
pin: menu:PF1
pwm: True
value: 0
shutdown_value: 0
cycle_time: 0.001
scale: 1000
 
[gcode_macro M300]
gcode:
    # Use a default 1kHz tone if S is omitted.
    {% set S = params.S|default(1000)|int %}
    # Use a 10ms duration is P is omitted.
    {% set P = params.P|default(100)|int %}
    SET_PIN PIN=BEEPER_pin VALUE={S} CYCLE_TIME={ 1.0/S if S > 0 else 1 }
    G4 P{P}
    SET_PIN PIN=BEEPER_pin VALUE=0

# name of neopixel should match name referenced in printer.cfg
# if there are other gcode_macros referencing the led display (e.g delayed gcode_macro)
[neopixel fysetc_mini12864]
pin: menu:PA13
chain_count: 3
color_order: RGB
initial_RED: 1.0
initial_GREEN: 1.0
initial_BLUE: 1.0

But display doesn't work correctly:

1. The display is black;
2. Rotation or clicking the encoder kills printer (need to reboot)

Only kill button works correctly.

I added klippy.log after rotation of the encoder. 

 

 

Edited March 13 by pasha4ur

[atrushing]

The BTT and Fysetc Mini12864 displays have their EXP ports rotated differently. The first section of this Voron guide explains how to change the connector housings so that the pinout aligns properly.

[pasha4ur]

14 minutes ago, atrushing said:

The BTT and Fysetc Mini12864 displays have their EXP ports rotated differently. The first section of this Voron guide explains how to change the connector housings so that the pinout aligns properly.

I rotated the image with the Fysetc pinouts. Looks like same as BTT

 

[atrushing]

11 minutes ago, pasha4ur said:

I rotated the image with the Fysetc pinouts. Looks like same as BTT

It is the header for each ribbon cable that needs to be rotated on the back of the Mini12864. Fysetc and BTT do not use the same plug orientation so the signals get crossed.

[pasha4ur]

16 minutes ago, atrushing said:

It is the header for each ribbon cable that needs to be rotated on the back of the Mini12864. Fysetc and BTT do not use the same plug orientation so the signals get crossed.

this board don't use cables.

I rotated wires on 180* and now I get error "Shutdown due to kill button!" from start.

I changed "kill_pin: ^menu:PF0" to "kill_pin: menu:PF0".

Now it works few moment. Then I hear something like a quiet sparkling current probably from the speaker and I get this error again.

 

 

 

 

 

 

 

[pasha4ur]

I deleted Rotated wired, attached board again and after such experiments it works now О_о

 

I also changed kill_pin: menu:^PF0 to kill_pin: menu:PF0

Edited March 13 by pasha4ur