I made several custom PCBs using the STM32F446RET6 chip. At first the CAN seemed to work fine, by reading it out with a Kvaser (CAN sniffer). However problems arrived when attaching other devices (like a beagle bone) to the CANbus. The beagle bone on...

I designed a PCB that has a stm32f446RE MCU on it. All of it seems to function well, I can send and receive over three UART channels, and can receive messages over CAN Bus. However, when I try to send messages over CANbus to a separate store-bought m...