USART3 initialization in stm32f103r8

[GS_it]

#include "stm32f10x.h"

void usartSetup (void);

int SendChar ();

int main()

{

 while(1)

 {

usartSetup();

 SendChar();

}

}

void usartSetup (void) 

{

RCC->APB1ENR = 0x00040000;

 RCC->APB2ENR = 0x0000000C;

  

GPIOB->CRH  = 0x00000900;

 USART3->BRR = 0x340;

 USART3->CR1 = 0x00002008;

}

int SendChar () 

{  

 while (!(USART3->SR & 0x00000080));

  USART3->DR = '2';

}

I tried this simple program for USART3 communication, it doesnot work for me. I initialize the registers as same as USART1, is there any configuration i missed in above code, please point me out.

[Tesla DeLorean]

What's with the sock-puppet accounts?

https://community.st.com/s/question/0D50X0000Aqql5aSQA/about-usart-in-stm32

Perhaps OR on clock signals rather than blind writing.

Document or comment the code so we know what pins and ports we're talking about, and you'll remember a week from now when you come back to the code.

Is anything else physically connected to the pins?

Can you use a scope to understand what's happening?

Can you use a debugger to check what registers are getting set too?

Consider that APB1 will clock at 36 rather than 72 MHz.