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STM32CubeF2 UART not sending more than 6 bytes

Question asked by Seto.Chris on Jul 27, 2016
I'm using the STM32CubeF2 libraries on an STM32F205. Using the UART library, it seems like I can only send a few bytes before calls to HAL_UART_Transmit result in any additional sent bytes.

void ConfigureDebugUart()
    // Enable clocks
    // Configure GPIO
    GPIO_InitTypeDef GPIO_InitStruct;
    GPIO_InitStruct.Mode      = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull      = GPIO_NOPULL;
    GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Pin       = GPIO_PIN_5 | GPIO_PIN_6;
    GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
    // Configure the USART peripheral
    UartHandle.Instance          = USART2;
    UartHandle.Init.BaudRate     = 115200;
    UartHandle.Init.WordLength   = UART_WORDLENGTH_8B;
    UartHandle.Init.StopBits     = UART_STOPBITS_1;
    UartHandle.Init.Parity       = UART_PARITY_NONE;
    UartHandle.Init.HwFlowCtl    = UART_HWCONTROL_NONE;
    UartHandle.Init.Mode         = UART_MODE_TX;
    UartHandle.Init.OverSampling = UART_OVERSAMPLING_8;
    // Commit the USART
int fputc(int ch, FILE *f)
    HAL_UART_Transmit(&UartHandle, (uint8_t *)&ch, 1, 0xFFFF);
    return ch;

Does anyone have an ideas as to what might be going on here?