Below is how I am using the HAL_SPI_TransmitReceive() function. This function takes a pointer to a UART_HandleTypeDef structure, a pointer to the data buffer, and the length of the data to be transmitted as arguments. With DMA, you set up things to start a transfer, and it ends with an interrupt I can see two potential problems: (1) The main MCU has no crystal but gets the external clock from the ST-Link. You might not have set DMA correctly in the peripheral. Invoking the interrupt routine + all your HAL code will take muck more than 72 clocks you have (72e6 / 1e6). special dedicated hardware which takes over the task of shuttling data between a hardware peripheral such as a UART and memory. Follow answered at However, it requires suppressing null bytes during transmission by setting UART_RS485_CONF_REG. Open your stm32CubeIDE the go to File>New>Stm32 Project. I 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. The rest of my program continues to work. This tutorial shows how to use the STM32 UART interface in different modes using the HAL libraries. I want to send and receive data using DMA but HAL_UART_Transmit_DMA this function not sending any data returns HAL_BUSY I don't have the docs handy, but IIRC HAL_UART_Transmit_IT doesn't make a copy of the buffer, so you need to wait for the transmit callback before modifying data_buffer again. Learn more about Teams HAL_UART_Transmit_IT uses an interrupt to send bytes out (it is non-blocking). Resetting the port status will let the function run again, but still doesn't transfer any data. Click on Generate Code and accept to open your project in STM32CubeIDE. If you click in the “DMA Settings” tab, it will show the message to go to GPDMA1: Following the previous guidelines for selecting the GPDMA channels, we’ll assign Channels 10 and 11, both with 2 word FIFO and we’ll set them in Standard Request Mode. Hal uart transmit setup not working, There are still a few problem Hal uart transmit setup not working, There are still a few problems, like in my setup I give a Standard ID and not extended, but it sends an extended ID.
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