Posted on November 08, 2015 at 21:19I have a running project with STM32F103 and I wanted to add UART Transmit to do some debugging but HAL_UART_Transmit does not work and does not transmit any data. I have chosen USART2 and PD.5 and PD.6 pins as the interface. The weird thing is that when I create a new project using STM32cubemx the UART does work. But when I implement necessary changes into my first project the UART does not work. I checked a lot of times for something maybe missing but yet have not figured this out.
Here's what I did:
First enabled HAL_UART_MODULE_ENABLED in stm32f1xx_hal_conf.h
Then :
UART_HandleTypeDef huart2;
Init function which will be called in main:
void UART_Config(void)
{
/* UARTx configured as follow:
- BaudRate = 115200 baud
- Word Length = 8 Bits
- One Stop Bit
- No parity
- Hardware flow control disabled (RTS and CTS signals)
- Receive and transmit enabled
*/
/* Peripheral clock enable */
huart2.Instance = USART2;
huart2.Init.BaudRate = 38400;
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);
}
And HAL_UART_MspInit() to init PD.5 and PD.6 which will be called at the end of above code:
void HAL_UART_MspInit(UART_HandleTypeDef* huart)
{
GPIO_InitTypeDef GPIO_InitStruct;
if(huart->Instance==USART2)
{
/* USER CODE BEGIN USART2_MspInit 0 */
/* USER CODE END USART2_MspInit 0 */
/* Peripheral clock enable */
__USART2_CLK_ENABLE();
/**USART2 GPIO Configuration
PD5 ------> USART2_TX
PD6 ------> USART2_RX
*/
GPIO_InitStruct.Pin = GPIO_PIN_5;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_6;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
__HAL_AFIO_REMAP_USART2_ENABLE();
/* USER CODE BEGIN USART2_MspInit 1 */
/* USER CODE END USART2_MspInit 1 */
}
}
Then I'm simply calling HAL_UART_Transmit() in the main function after the initialization of all the peripherals like this :
HAL_UART_Transmit(&huart2, ''Hello\n'', 6, 10);
But I don't see anything in terminal and I assure you the hardware and connections and things like that are fine considering it all work with a new project. But since I have lots of code in this project I figured it would be easier to insert UART in this project instead of doing the other way around.
It's not supposed to be this hard getting a simple UART to work.
Could you guys help me?
#uart
