UART transmission hangs

[SB-RK]

When I wrote the code created with CubeMX in the circuit in the attached image and executed it, it hung up at UART transmission.

This is a simple program with one line of additional code.(HAL_UART_Transmit)

What am I doing wrong?

I haven't been able to resolve it for a week.

 

[gbm]

To ensure proper user program start, BOOT0 must be at logic LOW - connected to GND directly or via resistor up to 100k.

[TDK]

How do you know it's hung up? What happens when you debug it and step through the code?

[Karl Yamashita]

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@SB-RK wrote:

When I wrote the code created with CubeMX in the circuit in the attached image and executed it, it hung up at UART transmission.

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Very vague. Describe in more detail on what you mean by hung up

[SB-RK]

Thank you everyone.
I solved it by connecting BOOT0 to GND.

I say hang-up because stepping does not return from HAL_UART_Transmit.

It was really helpful.

 

Thank you very much.