STM32F4: Issues with USART1 Configuration

I'm currently experimenting with writing a driver for USART1 at the register level for the STM32F4 Discovery board. I've followed the initialization procedure on page 963 of RM0090; however, when I connect to my PC via my FTDI cable, all I get are junk characters. The LED blinks normally though, so I know I'm not blocking on the while loop that checks the TXE bit. I've also checked my HSE_VALUE, which is 8000000. I'm completely at a loss as to what I missed. How can I get this code running?

#include ''stm32f4xx.h''
int main(int argc, char* argv[]){
// At this stage the system clock should have already been configured
// at high speed.
// Clock configuration
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOBEN; // Enable GPIOB clock
RCC->APB2ENR |= RCC_APB2ENR_USART1EN; // Enable USART1 clock
// GPIO configuration
GPIOB->MODER |= GPIO_MODER_MODER6_1; // Enable GPIOB alternate function on pin 6
GPIOB->MODER |= GPIO_MODER_MODER7_1; // Enable GPIOB alternate function on pin 7
GPIOB->AFR[0] |= 0x07000000; // Select USART1 alternate function (Find this mask)
GPIOB->AFR[0] |= 0x70000000; // Select USART1 alternate function (Find this mask)
GPIOB->OTYPER = 0; // Set GPIOA to push-pull
// USART configuration
USART1->CR1 |= USART_CR1_UE; // Enable USART1
USART1->CR1 &= ~USART_CR1_M; // Configure M bit for word length (8b)
USART1->CR2 &= ~USART_CR2_STOP; // Configure number of stop bits (1b)
USART1->CR3 &= ~USART_CR3_DMAT; // Configure DMA (disabled)
USART1->BRR |= HSE_VALUE / 9600; // Set baud rate
USART1->CR1 |= USART_CR1_TE; // Set transmit enable
// Blinky LED configuration
RCC->AHB1ENR |= RCC_AHB1ENR_GPIODEN; // Enable GPIOD clock
GPIOD->MODER |= GPIO_MODER_MODER12_0; // Enable GPIO output on port D, pin 12
for(int i = 0; i < 
10000000
; i++){
asm(''nop'');
}
// Infinite loop
while (1){
// Add your code here.
// Send some data!
while(!(USART1->SR & USART_SR_TXE));
USART1->DR = 'B'; // Send 'B'
GPIOD->ODR ^= GPIO_ODR_ODR_12; // Blink LED
for(int i = 0; i < 10000000; i++){
asm(''nop'');
}
}
}