ARM Cortex-M3 series STM32F103RCT6 chip with 32-bit CPU 72MHz. Equipped with highly modular open source firmware Marlin2.0, convenient for users DIY and secondary development, exempt from the worries of the core code;
I need to make changes to Marlin on this board but cant even get the unchanged demos to work.
Every time use a firmware.bin built from platformio and update the board to shows up as "Unknown USB Device (Device Descriptor Request Failed)".
The only firmware that will work correctly and is the firmware.bin that came on the SD card.
Any help is greatly appreciated, thank you.
EDIT: I got this working, I switched the 5v jumper from INT to USB and it worked after inserting the SD card and pressing the reset button on the board. I not sure if that is documented anywhere but its working now and I can switch the jumper back to INT after I get the firmware all configured.
I need to make changes to Marlin on this board but cant even get the unchanged demos to work. Every time use a firmware.bin built from platformio and update the board to shows up as "Unknown USB Device (Device Descriptor Request Failed)". The only firmware that will work correctly and is the firmware.bin that came on the SD card. Any help is greatly appreciated, thank you.
EDIT: I got this working, I switched the 5v jumper from INT to USB and it worked after inserting the SD card and pressing the reset button on the board. I not sure if that is documented anywhere but its working now and I can switch the jumper back to INT after I get the firmware all configured.