Going to wire up to some DM860i drivers and big 6A steppers for a project. I got Raspberry Pi Picos, BTT SKR pro 1.2 and a couple of MKS Robin E3Ds running allready. I tried flashing klipper to a ST Nucleo STM32H743ZI (i have version ZI, NOT ZI2) I selected “no bootloader” and comms on USB PA11…

I found this Changed the clock to 25MHz, recompiled, flashed and got a connection: [image] [17128.267372] usb 1-1.2: USB disconnect, device number 12 [17142.317964] usb 1-1.2: new full-speed USB device number 13 using xhci_hcd [17142.429904] usb 1-1.2: New USB device found, idVendor=1d50, idProd…

not read the code, but seems the code base on some sepcial board. Most design use 25M of crystal, so I guess and try that. Which really frequency of crystal on your board?

From the ST document p25: MCO from ST-LINK (Default): MCO output of ST-LINK is used as input clock. This frequency cannot be changed, it is fixed at 8 MHz and connected to the PF0/PH0-OSC_IN of STM32 microcontroller I have checked, and the solder bridges are configured for “MCO from ST-Link”. But…

I am not connect also. I layout my board, the drivers I design as an “AUX” board. It just be finished machining, on the way to me. where you read the MCU frequency? I just can find the load of it. aml CPU ARMv8 Processor rev 4 (v8l) 64bit aarch64 with 4 cores Debian GNU/Linux 11 (bullseye) bu…

It shows in the webinterface (Mainsail) using klipper console.py, i get CLOCK_FREQ=12000000 at the very end (for pico) and CLOCK_FREQ=400000000 for stm32h743zi Raspberry Pi Pico > sudo service klipper stop > ~/klippy-env/bin/python ~/klipper/klippy/console.py /dev/ttyACM1 This is a debugging…

Thank you. My another board got this: root@aml:/dev# /home/klipper/klippy-env/bin/python /home/klipper/klipper/klippy/console.py /dev/ttyACM0 This is a debugging console for the Klipper micro-controller. In addition to mcu commands, the following artificial commands are available: PINS : Load …

Strange, these “Freq” values - a simple stm32f407VGT6 black pcb from aliexpress shows 168 Mhz. I guess I have to run the benchmarks to understand further. and/or get a better understanding of the code. [image]

I am reading this thread since I am interested in Klipper and I am very conversant with the STM32H743. It looks like there is some confusion with clocking but I am not sure since a good deal of this thread is relying on information not written but know to the people posting. In any case if it help…

Running on ST Nucleo STM32H743ZI

General Discussion

Sineos April 13, 2022, 12:37pm 5

See Pi Pico - 12Mhz CLOCK_FREQ? - #2 by koconnor

1 Like

Topic		Replies	Views
Klipper Firmware Fails to Start on Custom STM32F070 Board General Discussion	30	486	March 30, 2025
Octopus Pro MCU - H723 @ 550 MHz? Developers	17	7896	March 25, 2024
Klipper MCU not communicating with host General Discussion	3	139	March 29, 2026
Trying to build Firmware for STM32F070x6 Developers	7	250	January 29, 2025
Rtk.gpio and klipper General Discussion	22	1191	October 20, 2025

Running on ST Nucleo STM32H743ZI

Related topics