stm32 - USART6 STM32F746NG isn't working

I'm having trouble configuring the USART6 in my STM32F746NG. I am setting up the USART6 to enable UART comunication, using the code below to initiate it and also create an echo function.

    __USART6_CLK_ENABLE();


GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.Pin = GPIO_PIN_7;
GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;

GPIO_InitStructure.Alternate = GPIO_AF8_USART6;
GPIO_InitStructure.Speed = GPIO_SPEED_HIGH;
GPIO_InitStructure.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

GPIO_InitStructure.Pin = GPIO_PIN_6;
GPIO_InitStructure.Mode = GPIO_MODE_AF_OD;
HAL_GPIO_Init(GPIOC, &GPIO_InitStructure);

static UART_HandleTypeDef s_UARTHandle;


s_UARTHandle.Instance        = USART6;
s_UARTHandle.Init.BaudRate   = 115200;
s_UARTHandle.Init.WordLength = UART_WORDLENGTH_8B;
s_UARTHandle.Init.StopBits   = UART_STOPBITS_1;
s_UARTHandle.Init.Parity     = UART_PARITY_NONE;
s_UARTHandle.Init.HwFlowCtl  = UART_HWCONTROL_NONE;
s_UARTHandle.Init.Mode       = UART_MODE_TX_RX;
HAL_USART_Init(&s_UARTHandle);


  char generic_buffer;

    for (;;)
{
  HAL_UART_Receive(&s_UARTHandle,generic_buffer,1, HAL_MAX_DELAY);
  HAL_UART_Transmit(&s_UARTHandle,generic_buffer, sizeof(generic_buffer), HAL_MAX_DELAY);

}

But the code is not working, is there something missing in the configuration? I'm using the same code that worked in my STM32F407VG, changing the USART name and pins.