Can't send data through the USART Tx Pin in the STM32F411E-Disco Board

[MRamy.1]

#include "stm32f4xx.h"                  // Device header
 
void USART2_Init(void);
void USART2_Write(int ch);
void delayMS(int delay);
 
int main(void){
	
	USART2_Init();
	while(1){
		USART2_Write('H');
		USART2_Write('i');
		delayMS(1000);
	}
}
 
void USART2_Init(void){
	
	RCC->APB1ENR |= 0x00020000;
	RCC->AHB1ENR |= 0x00000001;
	
	GPIOA->AFR[1] = 0x00000070;
	GPIOA->MODER |= 0x00000020;
	
	USART2->BRR = 0x342;
	USART2->CR1 |= 0x00000008;
	USART2->CR1 |= 0x00002000;
}
 
void USART2_Write(int ch){
	
	while(!(USART2->SR & 0x0080)){
		USART2->DR = (ch & 0xFF);
	}
}
 
void delayMS(int delay){	
	int i;
	for(; delay>0; delay--){
		for(i = 0; i < 1000; i++);
	}
}

I am trying to Initialize and send data through PA3 (USART2_TX). When i connect the pin to a Serial to USB module to see the data sent on the terminal (CoolTerm) I get an error and doesnt' work. I set the baud rate based on that I have an 8MHz crystal on the board and still nothing is working. What is wrong in the code?

[Tesla DeLorean]

1. void USART2_Write(int ch){
3. while(!(USART2->SR & 0x0080)) {} // Wait on TXE
4.  
5. USART2->DR = (ch & 0xFF); // Then send
6. }

[MRamy.1]

I edited the code but there is a still a problem. I get the following error in CoolTerm "103 BreakCondition". I search and I found out that it is usually due to Hardware detected a break condition. Usually due to a signal rate mismatch. Is it a problem with the baud rate ?

[Tesla DeLorean · Accepted solution]

You might want to add comments about the pins, clocks and expectations.

Baud rate looks to be ~9600 baud from 8 MHz APB1

AFR[1]= 0x00000070; // Is NOT PA2

AFR[0] = (AFR[0] & 0xFFFFF0FF) | 0x00000700; // PA2:AF7

[MRamy.1]

Your code worked. But could you explain to me how is it possible. As I mentioned earlier that the USART2 is on AF7 and it is on the AFRH and in the code from my understanding that the AFRH is AFR[1]. Also in the datasheets it is written that AF7:0111 in AFRHy

[Tesla DeLorean]

AFR[0] nee AFRL deals with GPIO pins 0 thru 7

AFR[1] nee AFRH deals with GPIO pins 8 thru 15

PA2 would be in the former. Each pin has 4-bits assigned to it, so pin 2 would be bit positions 8 thru 11 of AFRL