USART6 bare metal setup correct?I am not getting output.

[CMcC.1]

Hi there.

I have been trying to configure this USART6 on my STM32F401RE board as 9600 and Async.

But I just can't seem to figure out what I am doing wrong? I am not using the HAL for this project.

I really just want to get an example of how to use the UART6 on PortA with this MCU.

Thanks

#define STM32F401xx
#include "stm32f4xx.h"
 
void USART_write(int ch);
void delayMs(int delay);
void USART6_Init();
 
int main(void)
{
	USART6_Init();
	GPIOA->MODER |= 0x400;
	//GPIOA->ODR |= 0x20;
	while(1){
		USART_write("H");
		USART_write("E");
		USART_write("L");
		USART_write("L");
		USART_write("O");
		delayMs(10);
		GPIOA->ODR ^= 0x20;
	}
}
 
void USART6_Init(){
	//RCC->APB2RSTR |= (1 << 5);
	//delayMs(1);
	//RCC->APB2RSTR |= (0 << 5);
	RCC->AHB1ENR |= 1;
	RCC->APB2ENR |= (1 << 5);
	GPIOA->AFR[0] |= (1<<15);
	GPIOA->MODER |= ( 1 << 23 );
	GPIOA->MODER |= ( 1 << 25 );
	USART6->BRR = 0x0683; //BAUDRATE 9600 @16Mhz
	USART6->CR1 = 0x0008; //ENABLE Tx
	USART6->CR1 |= 0x2000;
}
 
void USART_write(int ch){
	//WHile the TX Buffer is empty
	while(!(USART6->SR & 0x0080)){
		USART6->DR = (ch & 0xFF);
	}
}
 
void delayMs(int delay) {
	int i;
	for (; delay>0;delay--){
		for (i = 0 ; i < 3195; i++);
	}
}

[CMcC.1]

Oh yea thats right but I did see that as well though.

Problem however is that when I restart my Terminal that captures incoming chars on the /dev/ttyACM1 port it swaps back to being messed up.

No idea how that even happens though.

[Tesla DeLorean]

void USART_write(int ch){
	//WHile the TX Buffer is empty
	while((USART6->SR & 0x0080)){
		USART6->DR = (ch & 0xFF);
	}
} 

STOP putting the output to DR *INSIDE* the loop

You want to be waiting for the TXE to go high, AND THEN output to the DR