Posted by Andrei from The Great White North on 2015-11-17 05:32

Oh, by the way:

before main

UART_HandleTypeDef huart2;

after main before loop

GPIO_InitTypeDef GPIO_InitStruct;
	HAL_Init(); /* Initialize the hardware abstraction layer */
	__GPIOA_CLK_ENABLE();
	/**USART2 GPIO Configuration
	 PA2     ------> USART2_TX
	 PA3     ------> USART2_RX
	 */
	GPIO_InitStruct.Pin = GPIO_PIN_2 bitor GPIO_PIN_3;
	GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
	GPIO_InitStruct.Pull = GPIO_PULLUP;
	GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
	GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
	HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

	__USART2_CLK_ENABLE();
	huart2.Instance = USART2;
	huart2.Init.BaudRate = 9600;
	huart2.Init.WordLength = UART_WORDLENGTH_8B;
	huart2.Init.StopBits = UART_STOPBITS_1;
	huart2.Init.Parity = UART_PARITY_NONE;
	huart2.Init.Mode = UART_MODE_TX_RX;
	huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
	huart2.Init.OverSampling = UART_OVERSAMPLING_16;
	HAL_UART_Init(&huart2);