problem of using USART3 on STMH563ZI

[BrianYuan]

I'm new to STM and I'm trying to use USART to communicate between MCU board and my computer. I'm now using USART2 and CP2102 to translate TTL to USB. And have succeeded. But my goal is to directly use USB-C of STLINK to output serial data, because the user manual of this board just like below shows that the USART3 can directly output to USB-C of STLINK.  But I failed to use only USB to communicate and I don't no why.

 

[Pavel A.]

Check the solder bridges mentioned in the documentation. Has anyone played with this board before you?

Is the VCP of the board visible on the host side (lsusb or device manager) ?

 

[BrianYuan]

Thanks for your reply.
This board is brand new board, so the solder bridges should be default just like mentioned in the documentation. And sorry that I don't know what is VCP, could you please explain what do you mean by VCP is visible on host side?

[Andrew Neil]

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@BrianYuan wrote:

 what is VCP, could you please explain what do you mean by VCP is visible on host side?

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VCP = Virtual COM Port - the USB-to-UART connection appears on the PC as a "virtual" COM port,

 

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@BrianYuan wrote:

 please explain what do you mean by VCP is visible on host side?

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When you plug the board in to your host computer, do you see its "COM port" appear?

You haven't said what computer you're using, but on Windows it would appear in Device Manager; eg,

 

 

[mƎALLEm]

Hello,

Via ZIO connector, simply connect:

USART2_RX (PA3)  to USART3_TX (PD9)
USART2_TX (PD5) to USART3_TX (PD8)

Without disordering anything, you need to ensure that USART3 IOs are not configured to keep them as inputs.

[BrianYuan]

Do you mean that I should set USART3 to disabled. Then output the TX RX from USART2 and connect it to output pin of USART3 (TX to TX RX to RX) than I can read the data from the USB-C of STLINK?

[mƎALLEm]

Yes and you need to disable the gpio pins of USART3 no matter it’s is enabled or not.