serial port not work

[Ranjeet Singh]

i am using stm32l4r5zi microcontroller .i have enabled all uart port 1,2,3,4,5 but this is not showing data on usb serial port .does l4r5 usb serial port not supporting ?

 

[Ranjeet Singh]

i have also change the baud rate in LPUART1 ,(209700 to 115200 ) but data not showing

[gbm]

What board? How is your UART conected to your PC? Check the schematics; you will see which pins are connected to the UART interface. Setup the UART in CubeMX, double check that the proper pins are selected for it.

[AScha.3]

>i have enabled all uart port 1,2,3,4,5 

>is not showing data on usb serial port 

what now ?? use serial port on pin..xx OR usb /CDC driver as usb device ?

[Tesla DeLorean]

Explanation and context hard to follow.

Perhaps look at pin output with a scope.

Guessing a NUCLEO board.

Why using 7-bit mode?

Mismatch in bit and baud modes of terminal vs UART.

​Write a string output function that computes length.

I​f pins on GPIOG bank, make sure VCCIO2 enabled.

[WQ]

Don't use internal HSI/MSI RC clocks with that high baud-rate UART or try to slow down (to 9600 or lower). If you are using NUCLEO-L4R5ZI, the HSE oscillator is not populated. You have to use the MCO output from the ST-Link by closing SB109 and SB148 and setting HSE in bypass. That is what I experienced not a long time ago on the other L4 NUCLEO board. -wq

[gbm]

Not a problem. MSI may be synchronized to LSE, which is populated on Nucleo boards.

[Ranjeet Singh]

stm32l4r5zi 

[Ranjeet Singh]

if i will use serialch340 on pins then it work

[Ranjeet Singh]

question is this why usb port not worj will othere controlller work