USART LL_DMA STM32U5
Hallo, I'm using the Nucleo board for STM32U5, LL drivers for USART1 and DMA.
in my main.c the init function are:
static const char
long_string[] = ""
"What's the problem"
"???????\r\n"
"";
static void MX_USART1_UART_Init(void)
{
/* USER CODE BEGIN USART1_Init 0 */
/* USER CODE END USART1_Init 0 */
LL_USART_InitTypeDef USART_InitStruct = {0};
LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
LL_DMA_InitTypeDef DMA_InitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Initializes the peripherals clock
*/
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
/* Peripheral clock enable */
LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);
LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
/**USART1 GPIO Configuration
PA9 ------> USART1_TX
PA10 ------> USART1_RX
*/
GPIO_InitStruct.Pin = LL_GPIO_PIN_9|LL_GPIO_PIN_10;
GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
GPIO_InitStruct.Pull = LL_GPIO_PULL_DOWN;
GPIO_InitStruct.Alternate = LL_GPIO_AF_7;
LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USART1 DMA Init */
/* GPDMA1_REQUEST_USART1_TX Init */
DMA_InitStruct.SrcAddress = (uint32_t)long_string;
DMA_InitStruct.DestAddress = 0x00000000U;
DMA_InitStruct.Direction = LL_DMA_DIRECTION_MEMORY_TO_PERIPH;
DMA_InitStruct.BlkHWRequest = LL_DMA_HWREQUEST_SINGLEBURST;
DMA_InitStruct.DataAlignment = LL_DMA_DATA_ALIGN_ZEROPADD;
DMA_InitStruct.SrcBurstLength = 1;
DMA_InitStruct.DestBurstLength = 1;
DMA_InitStruct.SrcDataWidth = LL_DMA_SRC_DATAWIDTH_BYTE;
DMA_InitStruct.DestDataWidth = LL_DMA_DEST_DATAWIDTH_BYTE;
DMA_InitStruct.SrcIncMode = LL_DMA_SRC_INCREMENT;
DMA_InitStruct.DestIncMode = LL_DMA_DEST_FIXED;
DMA_InitStruct.Priority = LL_DMA_LOW_PRIORITY_LOW_WEIGHT;
DMA_InitStruct.BlkDataLength = 10;
DMA_InitStruct.TriggerMode = LL_DMA_TRIGM_BLK_TRANSFER;
DMA_InitStruct.TriggerPolarity = LL_DMA_TRIG_POLARITY_MASKED;
DMA_InitStruct.TriggerSelection = 0x00000000U;
DMA_InitStruct.Request = LL_GPDMA1_REQUEST_USART1_TX;
DMA_InitStruct.TransferEventMode = LL_DMA_TCEM_BLK_TRANSFER;
DMA_InitStruct.SrcAllocatedPort = LL_DMA_SRC_ALLOCATED_PORT0;
DMA_InitStruct.DestAllocatedPort = LL_DMA_DEST_ALLOCATED_PORT0;
DMA_InitStruct.LinkAllocatedPort = LL_DMA_LINK_ALLOCATED_PORT1;
DMA_InitStruct.LinkStepMode = LL_DMA_LSM_FULL_EXECUTION;
DMA_InitStruct.LinkedListBaseAddr = 0x00000000U;
DMA_InitStruct.LinkedListAddrOffset = 0x00000000U;
LL_DMA_Init(GPDMA1, LL_DMA_CHANNEL_0, &DMA_InitStruct);
/* USART1 interrupt Init */
NVIC_SetPriority(USART1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),5, 1));
NVIC_EnableIRQ(USART1_IRQn);
/* USER CODE BEGIN USART1_Init 1 */
/* USER CODE END USART1_Init 1 */
USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1;
USART_InitStruct.BaudRate = 115200;
USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
USART_InitStruct.Parity = LL_USART_PARITY_NONE;
USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
LL_USART_Init(USART1, &USART_InitStruct);
LL_USART_SetTXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_8);
LL_USART_SetRXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_8);
LL_USART_DisableFIFO(USART1);
LL_USART_ConfigAsyncMode(USART1);
LL_USART_Enable(USART1);
/* USER CODE BEGIN USART1_Init 2 */
LL_USART_EnableIT_TC(USART1);
LL_DMA_EnableIT_HT(GPDMA1, LL_DMA_CHANNEL_0);
LL_DMA_EnableIT_TC(GPDMA1,LL_DMA_CHANNEL_0);
LL_DMA_EnableIT_USE(GPDMA1, LL_DMA_CHANNEL_0);
LL_DMA_EnableIT_ULE(GPDMA1, LL_DMA_CHANNEL_0);
LL_DMA_EnableIT_DTE(GPDMA1, LL_DMA_CHANNEL_0);
LL_USART_EnableDMAReq_TX(USART1);
LL_DMA_EnableChannel(GPDMA1, LL_DMA_CHANNEL_0);
/* USER CODE END USART1_Init 2 */
}
LL_DMA_IsActiveFlag_DTE becomes active.
What am I doing wrong?
Thnak you
Any help would be appreciated.
It was missing this
DMA_InitStruct.DestAddress = LL_USART_DMA_GetRegAddr(USART1, LL_USART_DMA_REG_DATA_TRANSMIT);