not able to perform UART communication between Nucleo wl55jc2 and stmf104c8t6 what could be the reason?

[SSaya.1]

UART setting are shown in picture of both devices

[Tesla DeLorean · Accepted solution]

You've coded the solution incorrectly?

You have the wrong pins?

You haven't crossed the RX/TX between the micro-controllers?

The clocks are wrong?

Suggest to get a scope, and test one outputting a 'U' data pattern in a continuous loop, check the bit timing and that it's using the expected pin, etc.

[TDK]

Check that the HSITRIM value in the WL55JC2 is being set correctly.

[SSaya.1]

thank you for your reply

the clocks were wrong

i put 48Mhz on stmwl55jc2 and 72MHz on stm32f103c8t6 then uart worked fine

[SSaya.1]

thank you for your reply

wl55jc has MSI, i used MSI clock