Solved
No signal on LPUART1 TX Signal on NUCLEO-L476RG
Hello Everybody,
i am trying to use LPUART1 on the NUCLEO board. I attsched an oscilloscope probe on the TX pin and tried to send a simple "Hello world\n". But I don't get any signal from the pin. The data is correct transmitted in TDR register.
Does anybody have a hint on what is wrong there?
Here is my LPUART init routine:
/* USER CODE BEGIN 0 */
uint8_t LPUARTBufferTx[] = "Hallo Welt\n";
/* USER CODE END 0 */
UART_HandleTypeDef hlpuart1;
/* LPUART1 init function */
void MX_LPUART1_UART_Init(void)
{
hlpuart1.Instance = LPUART1;
hlpuart1.Init.BaudRate = 9600;
hlpuart1.Init.WordLength = UART_WORDLENGTH_8B;
hlpuart1.Init.StopBits = UART_STOPBITS_1;
hlpuart1.Init.Parity = UART_PARITY_NONE;
hlpuart1.Init.Mode = UART_MODE_TX_RX;
hlpuart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
hlpuart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
hlpuart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&hlpuart1) != HAL_OK)
{
Error_Handler();
}
}
void HAL_UART_MspInit(UART_HandleTypeDef* uartHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(uartHandle->Instance==LPUART1)
{
/* USER CODE BEGIN LPUART1_MspInit 0 */
/* USER CODE END LPUART1_MspInit 0 */
/* LPUART1 clock enable */
__HAL_RCC_LPUART1_CLK_ENABLE();
__HAL_RCC_GPIOC_CLK_ENABLE();
/**LPUART1 GPIO Configuration
PC0 ------> LPUART1_RX
PC1 ------> LPUART1_TX
*/
GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF8_LPUART1;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/* USER CODE BEGIN LPUART1_MspInit 1 */
/* USER CODE END LPUART1_MspInit 1 */
}
}and this is the transmit call:
if(HAL_UART_Transmit(&hlpuart1, &LPUARTBufferTx[0], 11, 100) != HAL_OK)
{
Error_Handler();
}best regards
Benjamin
