Stm32 uart dma transmit . 0. Then, you The HAL_UART_Transmit_DMA function (at line 895 in the file I uploaded) sets 'huart->gState' to HAL_UART_STATE_BUSY_TX which is fine but when the transfer is completed, it should be set back to HAL_UART_STATE_READY. Sincerely yo Receiving data with UART and DMA when application does not know in advance size of bytes to be received Transmitting data with UART and DMA to avoid CPU stalling and use CPU for other purposes STM32 has peripherals such as USART and UART. HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size) STM32 UART reliability with high baud rate. USART What exactly is the hardware arrangement of the UART link, and how is it affected by the powerdown/powerup? Observe the receiver using oscilloscope/LA, especially in vicinity of the STM32 powerup. The appropriate DMA instance, UART-DMA channel, GPIO and alternate function settings should be changed In STM32 microcontroller family, U (S)ART reception can work in different modes: DMA mode: DMA is used to transfer data from USART RX data register to user memory on In this tutorial, we’ll discuss the STM32 UART Interrupt DMA Polling methods using the HAL APIs. In our last article, we have seen complete detailed information of Hi, I met a strange issue and wish to get help. main { initialization code from CubeMX HAL_UART_Transmit_DMA(&UAR Hi, I met a strange issue and wish to get help. But I wondered when DMA knows that UART sent 8 bit when it is TX DMA or recevied 8 bit when it is in RX DMA. it works perfectly when i use "HAL_UART_Transmit_DMA(&huart1, TxBuf, 5);" in the main program. Browse STMicroelectronics Community. I try to use DMA but failed. Does not trigger an interrupt DMA when In this guide on STM32H5, we shall configure the UART to transmit data using DMA to offload the transmission process to the DMA rather than sending it byte by byte. How can I make HAL_UART_Transmit_DMA() work? I've already tried reordering the generated MX calls, so that MX_DMA_Init() is called before the UART_Init()s. Based on LL (low-level) drivers for UART and DMA. These drivers are ≈ 200 lines of (dense) C++17 code. gState to HAL_UART_STATE_BUSY and all the other transmissions I'm using Atollic True Studio V 9. Both TX and RX boards should be connected to your computer. Problem: The problems I am having is that the RxBuffer is not receiving anything when trying to transmit data. In this tutorial, we will show you how to use STM32 Blue Pill UART with DMA to transmit and receive data through direct memory access without requiring to involve CPU. In this tutorial, we will see how I am trying to implement UART in DMA mode to transmit a simple string every time a push button is pressed. What I have tried: initialize the DMA before the peripheral (Nothing). This is the Series of tutorials on the STM32 Microcontroller. The data is transmitted in blocking mode i. The rest of the UART configuration is same as the previous tutorials with Baud Rate of 115200 with 8 data bits, 1 stop bit and no parity. I2S DMA Operation Implementing DMA for I2S to receive digital audio is straightforward. FAQs Sign In. The data width is Byte as the UART transfers the data in bytes. After initialization of USART in STM32, insert a delay worth several characters; alternatively, transmit several 0xFFs before anything else. 1. The DMA mode is set as Normal. 9. Ask Question Asked 1 year, 7 months ago. DMA is an advanced topic and currently not covered in this series. Hello dear experts, I am trying to send a binary 32bits over the uart3 using either HAL_UART3_Transmit (polling, It or DMA). 78. In this guide, Mastering FOTA with STM32 and ESP8266 . The next transmission may start after it has finished DMA on STM32¶ I’ve now implemented DMA-based UART drivers for a range of STM32 families: F1/F3/F4/F7, H7, and L0/L4. STM32F103 Cannot receive data via UART on RX Using DMA to transmit UART on the STM32F7xx. I try to use DMA STM32 HAL_UART_Transmit_DMA issues. I'm using a STM32F407VET6 and receiving data through UART with DMA to send it back by the USB using CDC_Transmit_FS. STM32: directly connecting peripherals I2C with UART via DMA. The UART is operating Latest updates and examples are available at my official Github repository. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The first half of the transmit buffer is loaded with new data by the CPU in the Transmit Half Complete interrupt callback while the second half of the buffer is being transmitted by the DMA in the background. In this example 2000 bytes will be transfered using DMA, Transmit Half Complete and Transmit Complete interrupts achieving the best performance. --Update: requested code. All three MX_USARTn_UART_Init() functions have identical bodies (with the exception of the Hello dear friends, I use F4 series MCUs. STM32 HAL UART Transmit DMA problem. We'll be using blocking mode in this lesson, and interrupt mode in the upcoming ones. e the CPU will block every other operation until the data transfer is complete. The primary distinction here is that we won't define a timeout. I tested the. Associate III DMA in STM32 can work in normal or circular mode. Click here for details about this function. (In Func_3G_Comm func)Enable HAL_UART_Receive_DMA Posted on September 18, 2017 at 07:46 Hiya, I'm using the UART in 9 bit mode, with the 9th bit being used as an address indication. The UART baud rate should be such that the UART DMA terminates a little earlier before the next ADC interrupt arrivesk, triggering the next UART DMA, and so on. 0 , CubeMx v5. I created a circular buffer, on which I can write my strings. For UART/USART block, you can configure transmit mode using Buffered mode using TXE interrupt, Buffered mode using DMA and Polling mode in Configuration Parameters (Configuration Parameters > Hardware Implementation > Hardware Board > UART/USART > Transmit mode). Universal Asynchronous Reciever-Transmitter (UART): Unlike SPI which is a communication protocol, the UART is a physical circuit inside the STM32 microcontroller. However, every subsequent call fails with HAL_UART_STATE_BUSY. I followed the AN4666 to read data from GPIOC ports triggered by timer input capture mode and save into a large buffer of uint8 in size of (510000) arrays, all I want to do is to transmit the full buffer after the reading operations is complete to my pc. After 1 successful data transmission, the state flag remains on BUSY. The first call to HAL_UART_Transmit_DMA works correctly and the expected bytes are sent. HAL_UART_Transmit_DMA() / HAL_UART_Receive_DMA() with parameters: Pointer to data buffer; Amount of data elements to transmit / receive; STM32 UART DMA RX/TX. The example was written for an STM32F4 Discovery board (STM32F407VG). Switch the order so that the DMA is initialized before the USART fixed it. JW I am working on a project using UART communication and I have a question what is really different between interrupt mode and DMA mode in TX except for their underlying mechanism. I have also connected UART (PA3-PA2) and Potentiometer on ADC (PA0). In this case it is TX. I have tried transmitting it through UART but I realized that the maximum size I can transmit is 65535 bytes before it I wrote an application configuring the USART for DMA transmission. STM32 MCUs. 2) Using UART2 to demonstrate. STM3 USART+DMA not receiving. I saw an example with almost the same code and it has worked for the person. DMA enable (if UART Tx DMA is enabled before DMA, the TXE signal towards DMA is active sooner than DMA, so at the moment DMA is enabled it already sees the peripheral request but it does not have buffered the byte to be transmitted from the memory yet - and as STM32 MCUs Products; STM32F030 UART TX via DMA only works once; Options. We’ll implement an In this series we will cover different ways of transmitting and receiving data over the UART protocol. If I use the interrupt mode (just change HAL_UART_Receive_DMA to HAL_UART_Receive_IT, it does work and the RX Complete callback is being called. I've checked some codes for example HAL_UART_Transmit_DMA(). I got this working yesterday using DMA_NORMAL mode - bascially as Tesla Delorean suggested - determine when the data in the circular buffer wraps, then use the DMA to send the data up to the end of the buffer, and send the rest of the data at the beginning of the buffer in the transmit complete callback. We will also cover how to handle UART protocol in STM32 and create an example project in interrupt mode using the STM32 NUCLEO-F446RE development board that will transmit and receive data between stm32 and the host computer via USB port. Using the STM32 UART DMA mode is a significantly more efficient way of transmitting/receiving data over UART while keeping the CPU not loaded most of the time. Starting with the simplest one i. For transmitting the data, the DMA registe stm32 usart dma receive not starting if byte in data register. Kernel. Could you please advice, where is my mistake in ADC-DMA-UART processing and how can i fix it? With DMA configured, we can now use the HAL_UART_TRANSMIT_DMA function. The exact steps for each configuration will be discussed later on in the future tutorials in which DMA will be used. We’ll implement some of them in the upcoming tutorials’ LABs and projects. Labels: STM32CubeMX; 4 Kudos Comments Ahmet Yasin CİVAN. 例程简介1. The block diagram of DMA is shown below. I try to use HAL_uart_transmit_DMA, in a circular buffer for simple logs. 3. So if I write "Hello" wait enough time and "World" in 8 bit long buffer, I get: "rld'\0'oWo" in loop. (HAL_UART_Transmit_IT vs HAL_UART_Transmit_DMA) I know DMA uses the DMA controller which works independently, and Inter I created a local array in the function and sending data with UART via DMA from it. This method is good to use if you are only using UART and nothing else otherwise all other operations will be affected. Normal mode: In this mode, DMA starts transferring data and when it transfers all elements, it stops. My task is to transfer ADC reading to UART in DMA mode. rel1 in STM32CubeIDE (MCUs) 2024-12-20; STM32l0 stop mode and I2C slave: The UART DMAs are linear and send half of the buffer each. It seems it is not transmitting at all as it is not going into txCplt call back. After a search, I ended up on this thread and this fixed the problem. Difference is that USART also has advance feature such as Take a look at this guide to learn about the I/O modes in STM32 HAL. 0. STM32 MCUs Build GNU Tools for STM32 12. LED and Button interrupt worked well, but as soon as i have added the code for ADC and USART handling it stopped working. DMA_SxNDTR sets itself to max value (65535) after stream enabled. stm32; uart; dma; stm32f4discovery; Share. And it is directly going into Rxcplt call back. Product focus are extreme ultra-low-power features, enhanced security, integration, size and performance. 1 STM32 FreeRTOS - UART Deferred Interrupt Problem. If both DMAs are clocked by the same timer, you can even make the UART DMA cyclic on the same buffer and trigger it only once Use DMA channel 3 request 6, it's the I2C1_RX request. Its advanced integration and performance options are key driver for new innovative silicon IPs. Firmware Over-the-Air (FOTA) Update from Ground Up™ One-Time Purchase $129. You’ll learn how to use and configure the STM32 UART To Send/Receive Serial Data in polling, interrupt, and DMA modes. We’ll also implement a couple of STM32 UART In this series we will cover different ways of transmitting and receiving data over the UART protocol. DMA is in circular mode. 0, STM32F407VG-DISC1 board and enabled DMA for UART2. 0-RC5, Build: 20210714-1111 (UTC). UART TX in DMA mode function; Code. This makes me think I need to do something further to enable DMA. Remain in the same configuration as previously. Modified 1 year, 7 months ago. We have already explained about UART in detail in the last two articles, so we will explain about DMA here as much as we can. So I have used CubeMX to generate the code and I have configured UART2 TX DMA in normal (not circular) mode and also no UART is a communication protocol that enables the user to send data asynchronously through transmit (Tx) and receive (Rx) lines. Posted on October 22, 2017 at 16:13 I want to use ' HAL_UART_Transmit_DMA(); ' to send data in DMA mode like this : char. Mastering FOTA with STM32 and ESP8266 . ; Circular mode: In this mode, DMA starts with transfer, but when it reaches to the end, it jumps back on I'm having this exact issue with STM32CubeMX Version: 6. Getting DMA USART to work on STM32L053R8T6. HAL_SPI_Transmit_DMA(&SPIx_handle, (uint8_t *)TxBuffer, 8u); the HAL_SPI_GetState(&SPIx_handle) is stuck at Thanks guys for the suggestions. The following is my test code for DMA. I know it is set to sned 8 bit to peripheral. 6. Follow asked Feb 12, In a normal M4 like the STM32F466RE the MX program does most of the setup for transmitting the UART with DMA when you configure. Once you figure out the intricacies of DMA hardware, the actual differences across variants are relatively small. For each mode, it requires number of elements to transfer before events (such as transfer complete) are triggered. Ensure that the UART can transmit faster as the I2C is receiving. 4. in STM32 MCUs Products 2024-12-01; STM32F401 Interpreting DMA data over serial in STM32 MCUs Send string messages(AT command) from STM32 microcontroller to LTE module through UART Settings: 32MHz, using HAL_UART_Receive_DMA(115200baud, Circular mode, no interrupt), and a and printf function. In this project, we cover UART via polling, interrupt I have a problem with the HAL_UART_Transmit_IT function from the HAL library. However, here are a handful of possible scenarios: I'm trying to get UART transmit working over DMA on an stm32f405. In DMA mode, data can be transferred from UART RX data register to user memory without any CPU processing time. I am usinh HAL lib and I can send through uart using regular transfer funtion without problem: HAL_UART_Transmit(&huart4, ''mama_'', 5, 1000);But when I try to use t In this guide, we shall use DMA to transmit data over UART. Hardware preparation. ioc file in the STM32CubeIDE I have been trying exhaustively to program my STM32F7xx microcontroller to use DMA to transmit to UART. To overcome this problem we can use either INTERRUPT or DMA to transmit data. c Configuring the STM32 UART for high throughput data can be challenging. So far so good, now I asked myself, if I can i'veA question related to transmission using DMA. Subscribe to RSS Feed; Mark Topic as New; Mark Topic as Read; Float this Topic for Current Word Length = 8 Bits // One Stop Bit, No parity, // Hardware flow control disabled (RTS and CTS signals) //Receive and transmit enabled USART_InitStructure. Every beginning of transmission shows that 10th character is dropped, everything else looks fine even for large data blocks. I didn't take these things into account and I'll try to implement it all. STM32 + UART + DMA RX + unknown length This repository may give you information about how to read data on UART by using DMA when number of bytes to receive is not known in advance. How can I reach this goal? I am able to send data via DMA and receive data in interrupt, but the problem is in simultaneous use of DMA for data transmit and receive interrupt. Open the UART. STM32 DMA Examples There are several use cases for the DMA units in STM32 microcontrollers. In the previous tutorial we saw This is because the UART is transmitting data in blocking mode and until the transfer completes, no other operation can take place. Product integrates new and most advanced DMA block ever seen in any of STM32 Hello, I got a problem with HAL library 10. Apart from my protocol logic, I added two callbacks: void HAL_UART_RxCpltCallback(UART_HandleTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size); HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size); Các bước thực hiện. Asking for help, clarification, or responding to other answers. the issue is my circular DMA write it as as loop instead as finishing at the end of the string. \$\begingroup\$ Bumped into this while looking for solution why my SPI would lose every other byte if using DMA for endianness swapping on incoming half-words. I have setup some my UART on the STM with DMA , and sometimes I tranceived UART data with the HALs DMA functions (HAL_UART_Transmit_DMA und HAL_UART_Receive_DMA) and sometimes with the HALs timouted functions (HAL_UART_Transmit und HAL_UART_Receive). We’ll implement three STM32 UART Receive Examples Using Polling, Interrupt, and DMA to practice what we’ll learn in this tutorial. Ideally though I want to use 8 bit DMA I have done the implementation of 3 wire SPI using DMA and when I do SPI transfer using. We suggest you read this AN. Modified 7 years, 2 months ago. USART1 is set to Non-Secure and linked to GPDMA1 C DMA for USART1 Transmit mode DMA (Direct Memory Acess) Direct memory access (DMA) is used in order to provide high-speed data transfer between peripherals and memory as well as memory to memory. DMA Configuration. The code I use is No, you are using HAL_UART_Transmit(), which is not only a blocking call from code execution perspective, but also uses HAL's ingeniously stupid "lock" mechanism, which makes also Rx calls to fail and return HAL_BUSY. 3) CubeMX + KEIL code understanding. Here is the complete main. The harmless FIFO interrupt occurs because of the sequencing of peripheral enable vs. Định nghĩa buffer; Gửi và Receiving data with UART and DMA when application does not know in advance size of bytes to be received Transmitting data with UART and DMA to avoid CPU stalling and use CPU for other purposes STM32 has peripherals such as USART and UART. Dear Members, I am using STM32L4P5VGT, STM32CubeMX 6. i'm facing a strange situation. 1, and STM32Cube_FW_L4_V1. The RX thread would lock the handle and then the TX thread would try to lock as well and return HAL_BUSY. Most STM32 peripherals rely on DMA for high throughput, such as I2S for digital audio streaming. Browse STMicroelectronics Community Problem with sending more than 16Kbytes of data with CDC_Transmit_FS. 4 for STM32L152RE in UART DMA transmission, the data is transmited only one time using the function HAL_UART_Transmit_DMA(&huart3,t_Buffer ,11) using uart3, after that the UART3 structure keep the "flag" huart3. Clearing TC & making sure TXE = 1 before any sort of data The problem is, I am unable to receive data using DMA. I am also making use of ARM TrustZone. Writing interrupt-based drivers is tricky business. It appears that the uart state is not set back to ready when the DMA transmissio I am working with the STM32H745XIH6 disco board to use HAL_UART_Transmit_DMA and send 3 different strings. Are there no DMA UART examples for your board? In general terms the HAL's xxx_IT functions are particularly notorious for doing something other than what their names or the perspective of typical application needs would imply they should, so many people end The DMA request is set for USART2_RX as we are receiving the data via the DMA. You configure the DMA to match the audio format and choose a frame buffer size. How is c_uart_setup_dma() called and what is c_uart_transmit_dma() supposed to do? Better than explaining the above, construct and post a minimal but complete compilable code exhibiting the problem. In STM32 microcontroller family, U(S)ART reception can work in different modes: Polling mode (no DMA, I'm working on firmware for an STM32F103 which is communicating over RS232 at 9600 baud. There are two DMA peripherals, 1 and 2, and STMicroelectronics last STM32 release was with STM32U5 series, in Q4 2021. 8w次，点赞38次，收藏208次。Stm32 HAL库 USART(发送+接收)全部采用DMA形式主要参考的是俄国一位大神的文章文章目录Stm32 HAL库 USART(发送+接收)全部采用DMA形式@[toc]1. Three things are going on and I cannot explain or understand why this is happening, and hope . jianxuan (Jianxuan He) February 5, 2021, 7:36pm 1. 1- sending roughly the 32bits with a length of 4 in the function parameters does not work. Skip to main Can I with a STM32 use a DMA of a UART only for the receive? 0. At least on the 1st send of every string, the string are not shown correctly. This means that the microcontroller won't wait for the transaction to complete; instead, it will promptly move on to the next line of code. e using the POLL method. I dump internal information to a UART so I can see what is going wrong. I am looking to send UART data via DMA and receive data in interrupt. I've \$\begingroup\$ The halfway mix between direct register access and library calls here is a bit suspect. This part of my application is designed to send out text strings as a command line interface. Viewed 9k times 5 \$\begingroup\$ After setting up my project for a custom STM32F7 board which includes a FT2232H UART<->USB converter I got multiple problems when sending (and receiving data). Let's say the strings are as follows: uint8_t TX_String[] = STM32 DMA Receives UART Data in Wrong Order After First Time. 2. Posted on September 29, 2015 at 15:28 Hello there,I am trying to write a logger application using uart4 and DMA on STM32F4 discovery. Product forums. I have a version of this working well with 16 bit DMA transfers. I've tried sending char buffer through UART DMA and receive it. Set it up to do 8-bit circular peripheral to memory transfers, increment neither the peripheral nor the memory address, the peripheral address is the I2C receive register, memory address is the UART transmit data register. Difference is that USART also has advance feature such as I've got a problem with sending data over UART using HAL_UART_Transmit_DMA function "being inside" HAL_UARTEx_RxEventCallback function more then one time (actually it doesn't matter what the transmission function I use - DMA, IT or just blocking mode, the transmission is executed just once). Thread static void UART_DMATransmitCplt(DMA_HandleTypeDef *h Hello ! I've been wondering how DMA works in UART. But what I receive on the terminal are corrupted data. Hi, I met a strange issue As long as the application always has data to transmit, it is usually as simple as calling some sort of UART_Transmit(char* data, uint8_t len) as many times as needed. Precise SPI Timing with Timer and DMA on H7 in STM32 MCUs Products 2024-12-18; From what I can see HAL_UART_Transmit would've worked with the F4 HAL (v1. By far the easiest solution would be to forget about DMA and interrupts, and just use the regular polling routines, set up UART pins in respective GPIO_MODER as AF, and the AF per pin assignment table in datasheet; set UART baudrate, and enable UART; don't enable UART Tx interrupt in UART yet; enable UART interrupt in NVIC, optionally set its priority; In the program: write UART ISR, make sure its name matches the one in the vector table in startup file STM32U575 UART DMA problem I use DMA to transmit data via USART1 using DMA. We will also see different UART modes available in the STM32 microcontrollers and how to use them. Therefore, we're simply using HAL_UART_Transmit(). 4. For a loopback example without Electric UI integration refer to Currently I am working on UART DMA and I encountered problems after transmitting data via DMA UART. This article shows you In this tutorial, we’ll discuss the STM32 UART Communication. This is a mess. I need to transmit and receive the data by using UART_DMA method. 文章浏览阅读2. I wish to connect PC by UART. Buy now. Monitoring the watch windows indicates the data is indeed being transferred into the TDR register of UART5 (If, on my second transmission try, I transfer a new message, the final byte of that message is transferred into TDR). First of all I want to do a direct echo, when I recive data send it back for the same UART. Direct Memory Address typically known as DMA is a data transfer technique in which I/O or peripherals devices such as UART, I2C, SPI, ADC, etc can communicate directly with the memory without passing data through a CPU of STM32 microcontroller. I'm still thinking about handling it by DMA because as far as I know it may be the best solution STM32 HAL_UART_Transmit_IT never returns. HAL_UART_Transmit_IT and HAL_UART_Receive_IT don't lock the handle for the duration of the transmit/receive. main. 3 STM32 Interrupt driven STM32 SPI LL DMA Transmit. 18. The aim of this series is to provide easy and practical examples that anyone can understand. For me critical pointer was part of the sentence "it does DMA on 2 bytes, but the UART registers only has 1 byte, so half the bytes fall into a black hole". In this guide, we shall cover the following: UART Configuration for DMA in TX Mode. We aren't intimately familiar with the STM32, but we found some good documentation in the STM32 Application Note 4031 titled "Using the STM32F2, STM32F4 and STM32F7 Series DMA controller". Provide details and share your research! But avoid . Failing to In this tutorial, we will cover the STM32 USART peripheral. main () { initialization code from CubeMX HAL_UART_Transmit_DMA(&UART_Handle_Console, (uint8_t*)(listbuffer), len); while ( HAL_UART_GetState(&UART_Han I'm trying to do a kind of "terminal" interaction with my STM32L476. The USART is initialized prior to the DMA and the USART DMA transfers don't send anything while not producing errors. 1. 1 UART with DMA 6. Example. In this video, I have covered1) Basic understanding of UART. (In Func_3G_Comm func)Send string stored in txBuf by HAL_UART_Transmit. 2) if it weren't for __HAL_LOCK(huart). 4) UART2 to Transmit5) UART2 to STM32 UART in DMA mode stops receiving after receiving from a host with wrong baud rate. 1 STM32: unaligned circular DMA UART buffer. Transmit function call looks like that: HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, const uint8_t *pData, uint16_t Size) and in the call function I found the following lines: Posted on January 08, 2017 at 21:58. RS485 without flow control. However in my project i've crated a separate file for my application program, which i include in the main program, and when i call "HAL_UART_Transmit_DMA(&huart1, TxBuf, 5);" from my Hello I am currently working on a project needing UART via DMA, however when trying to transmit something via this UART nothing is received on the receiving end and the UART remains in HAL_UART_STATE_BUSY_TX. c. It involves a shared baud rate between the transmitter and receiver. When you select Transmit mode as Buffered mode using TXE interrupt or Buffered mode I am having issues transmitting data via uart with DMA. 3. I am steaming data on UART using TX DMA. This example firmware demonstrates using DMA for both rx and tx for minimal CPU load during transfers, and is 100% compatible with the Electric UI Quickstart Tutorial. This time, we will use DMA to run UART, so please read the DMA section in section 9 and the USART section in section 19 carefully. Which Download and Install STM32CubeIDE – Getting Started Guide; DMA Introduction. 2 -sorting the 32bits data in a 8bits array with >> and & and passing the array @ Posted on June 15, 2017 at 13:00 Dear community, I used CubeMX to setup a project for UART DMA transfers RX and TX. With the HAL driver, it works fine but do not like to use it due to processing and decided to use the LL driver and had a tough time making it work. Meanwhile in the infinite function while(1) I can use Currently I am only able to transmit data using DMA transfer once, but when I try and send again, the UART sends nothing. in which case you are calling HAL_UART_Transmit_DMA() repeatedly in a loop. UART allows for asynchronous communication between two devices using two wires. However there is NO DMA option when setting up the UART for the STM32MP157. Ask Question Asked 7 years, 2 months ago. Configure UART DMA.
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