STM32F4DISCOVERY CAN port cannot communicate

[CHTUZKI]

HI.

I have downloaded CanOpenSTM32 and am using the STM32F4DISCOVERY example. I am using a USB to CAN adapter to communicate with the STM32F4DISCOVERY via CAN. However, I found that the CAN communication is not working properly, even though the baud rate is correct. To rule out issues with my wiring, I used an Arduino CAN example program, and I found that the Arduino CAN program works fine.

I don't know how to solve this problem, has anyone else encountered this issue and can help me? Thank you very much,

warmest regards.