Started getting TMC random Driver issues since upgrading to the latest and adding a 12864 mini BTT LCD

General Discussion
1

I have no idea where to start debugging this :see_no_evil:

My printer setup is:

  • Annex K3
  • BTT Octopus 8 * TMC2209s
  • 300w 24V PSU
  • BTT 12864 v1.0 with the reset resistor removed (it was resetting the printer all the time)

I added the BTT 12864 LCD to my printer, and ever since I have been getting various TMC driver issues (TMC2209s sensorless homing). The printer performs 100% fine, but as soon as I add the [display] block, it becomes very unstable, and randomly gives one of many TMC fault codes.

The config I got from all the BTT repos, and should be fine, and I have double-checked them against a Voron 2.4 config, which seem to be correct, except the neopixel index order, but that should be fine.

########################################
# EXP1 / EXP2 (display) pins
########################################

[board_pins]
aliases:
    # EXP1 header
    EXP1_1=PE8, EXP1_2=PE7,
    EXP1_3=PE9, EXP1_4=PE10,
    EXP1_5=PE12, EXP1_6=PE13,    # Slot in the socket on this side
    EXP1_7=PE14, EXP1_8=PE15,
    EXP1_9=<GND>, EXP1_10=<5V>,

    # EXP2 header
    EXP2_1=PA6, EXP2_2=PA5,
    EXP2_3=PB1, EXP2_4=PA4,
    EXP2_5=PB2, EXP2_6=PA7,      # Slot in the socket on this side
    EXP2_7=PC15, EXP2_8=<RST>,
    EXP2_9=<GND>, EXP2_10=<5V>

###############################################
#	mini12864 LCD Display
###############################################
[display]
#  mini12864 LCD Display
lcd_type: uc1701
cs_pin: EXP1_3
a0_pin: EXP1_4
rst_pin: EXP1_5
encoder_pins: ^EXP2_5, ^EXP2_3
click_pin: ^!EXP1_2
contrast: 63
spi_software_miso_pin: EXP2_1
spi_software_mosi_pin: EXP2_6
spi_software_sclk_pin: EXP2_2

[neopixel btt_mini12864]
#  To control Neopixel RGB in mini12864 display
pin: EXP1_6
chain_count: 3
initial_RED: 1
initial_GREEN: 0
initial_BLUE: 0
color_order: RGB

#  Set RGB values on boot up for each Neopixel. 
#  Index 3 = display, Index 1 and 2 = Knob
[delayed_gcode setdisplayneopixel]
initial_duration: 1
gcode:
       SET_LED LED=btt_mini12864 RED=1 GREEN=0 BLUE=0 INDEX=1 TRANSMIT=0
       SET_LED LED=btt_mini12864 RED=1 GREEN=0 BLUE=0 INDEX=2 TRANSMIT=0
       SET_LED LED=btt_mini12864 RED=1 GREEN=0.2 BLUE=0.2 INDEX=3
2

At the moment, I can’t use the LCD at all, which makes me kinda sad.

3

There is most likely nothing that you can do Klipper wise. It could be the display itself or the cable to the display. Or some EMI effects, who knows.
These kind of errors definitively point towards a hardware issue. It is not Klipper raising these errors, it is the TMC driver chips. Klipper is only reporting them and acting accordingly.

4

Super odd hey, I have 4 off these, I will try another one out and see what it does. So the TMC drivers are adversely being affected. I will try out some things and see if anything helps thanks!