Problem with data transmission - NUCLEO-H753ZI

[Ditzhak]

Hi, Im using NUCLEO-H753ZI board and i want to send raw data to computer terminal. i tried to by using USART1. according to the schematics i can send data via USRAT1 through the USB power connection and it not working. i also tried to use USB_DEVICE to send the data but it fails again. 

in my last project i have used NUCLEO-U575ZI-Q and i send the data with USART1 and there were no problem at all.

can someone can help?

[Peter BENSCH · Accepted solution]

Not all NUCLEO boards have the same USART connected to the ST-LINK for a Virtual COM Port VCP, e.g. on the NUCLEO-H753ZI it is USART3, as can be seen from the schematics.

Hope that helps?

Regards
/Peter

[Tesla DeLorean]

Unfortunately "not working" is not a particularly helpful description.

The NUCLEO-H753ZI should have a ST-LINK/V3 with a VCP. Not sure of the band-width limit there, but I'd imagine it's quite high. Does it work at lower speeds?

Doesn't the VCP use USART3 PD8 / PD9 ?

USB fails? Fails HOW?

Anticipate you might have to debug your situation.

[Ditzhak]

Thank you for your answer,

i saw to that the USART3 is connected to VCP and i start the transmission with: 

HAL_UART_Transmit(&huart3, (uint8_t *)txBuf, len, HAL_MAX_DELAY);

when im in debug mode and i reach to the transmission command the command seems executed just fine but there is no output on the computer terminal.

my configuration is  USAT3, Mode >> Asynchronous, Baud Rate >> 115200.

The remaining configurations were not changed. 

I have tried to change the baud rate to 9600 and still the same result.

hope i manage to explain more efficiently the problem