STM32F030 Receiving UART Data Only Once

[salvi.a]

Hello,

I'm trying to send data to STM32 from NodeMCU. My project is simply controlling WS2812B LEDs by using SPI from STM32 and receiving commands by using UART to STM32 from NodeMCU.

LED's working fine by SPI but I can only receive data once at start. Then UART stops. I can still send commands to nodeMCU but it doesn't transmit to STM32 after first command.

What might cause this problem? Here is my SPI and UART setting

hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_SOFT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_16;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;

huart1.Instance = USART1;
  huart1.Init.BaudRate = 115200;
  huart1.Init.WordLength = UART_WORDLENGTH_8B;
  huart1.Init.StopBits = UART_STOPBITS_1;
  huart1.Init.Parity = UART_PARITY_NONE;
  huart1.Init.Mode = UART_MODE_RX;
  huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
  huart1.Init.OverSampling = UART_OVERSAMPLING_16;
  huart1.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
  huart1.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;

HAL_UART_Receive(&huart1, rxData, 1, 100);
 
	if(rxData[0] == '1'){
		setPixelColor(1,250,0,0);
		HAL_GPIO_WritePin(LED_YESIL_GPIO_Port, LED_YESIL_Pin, GPIO_PIN_SET);
	}else if(rxData[0] == '0'){
		setPixelColor(1,0,0,0);
		HAL_GPIO_WritePin(LED_YESIL_GPIO_Port, LED_YESIL_Pin, GPIO_PIN_RESET);
	}

[Karl Yamashita]

Your third snippet doesn't show what you're doing after you test for character '1' or '0'.

You have to post a more complete snippet.

[salvi.a · Accepted solution]

I fixed it. It wasn't about code. I just used UART by DMA and it working well now.

Thanks a lot.