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CAN

This project does not use CAN tranceivers (such as Microchip MCP2561). The program runs in Loopback/Silent mode instead.

Note: My can-bus project on github.com uses both CAN controllers and CAN tranceivers from Microchip. I even developed CAN controller driver by myself.

Connect Teraterm to the board at baudrate 9600bps to show output messages.

[1] MailBox#: 1
[2] MailBox#: 1
[1] StdId: 1
[1] RX_FIFO0: Hello!
[2] StdId: 2
[2] RX_FIFO1: World!
       :

CubeMX bug

My program did not work after rebooting the Nucleo board. The debugger showed me that the system stalls at SystemClock_Config().

The cause was a bug in CubeMX: https://community.st.com/thread/43671-cubemx-4221-bug

RCC_OscInitStruct.PLL.PLLM = 1;

It was required to upgrading CubeMX from V4.25 to V4.25.1 to fixed the bug.

STM32CubeMX Software V4.25.1 / 05 May 2018 Minor release 
Fixed PLLM code generation for STM32L4 Series.