Nucleo-U031R8 UART examples do not work?

[TheRaprus]

Hi to all.

I'm testing the Nucleo U031R8. To avoid the Package issue i switch also to the old package firmware version (1.0.0), but same error.

The example is UART_HyperTerminal_IT  and i simple cloned (or compiled directly in the repository), then execute without cars sending on the virtual comm port.

The progran stuck in function "UART_CheckIdleState", because the timeout of function "UART_WaitOnFlagUntilTimeout" is set to 0x1FFFFFFU via macro.

Is my new board damaged or similar? 

I've tried to rebuild the project via CubeMX (even in the recent 1.2.0 libs). No way.

Thanks.

[Andrew Neil]

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@TheRaprus wrote:

To avoid the Package issue .

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What "Package issue" ?

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@TheRaprus wrote:

The example is UART_HyperTerminal_IT  .

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Before adding the complexity of interrupts, can you get basic polled functions working?

[TheRaprus]

Here the package issue:

https://community.st.com/t5/stm32cubemx-mcus/package-error-when-importing-examples-of-nucleo-u031r8/td-p/753894
So, i tried the previous library.

Concerning the 2nd question, the stuck occour in the MX_USART2_UART_Init() function, a couple of codeline below the SystemClock_Config().

The stack is this:

MX_USART2_UART_Init() -> HAL_UART_Init -> UART_CheckIdleState(...)

MX_USART2_UART_Init() is defined in the main.c example (attached), the other two are stm32u0xx* library.
In this point the program stuck unsing both library: 1.0.0 and the latest 1.2.0

Here, in UART_CheckIdleState the program wait for the timeout.

I don't touch the example, simply connect the board, compile ad (try to) run. This is why I presume an HW error.

[Karl Yamashita]

Might be a clock issue. Upload your IOC file.

[TheRaprus · Accepted solution]

Did it, but nothing.

I tried playing with clock, changing the PLL and clocksourge (still in the examples).

Suddenly, everything work fine. Really donnow what happen. Never seen before (had abot 20+ Nucleos board).

Thanks