如何使用HAL_UART_Transmit_DMA函数发送数据呢？

我想使用 DMA 发送和接收数据，但是 HAL_UART_Transmit_DMA 这个函数不发送任何数据返回 HAL_BUSY 错误。
而在中断模式下的 uart 发送和接收数据都工作正常。
如何使用 DMA 发送数据？

/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "i2c.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
uint8_t tx_buffer[20] = {0};
extern DMA_HandleTypeDef hdma_usart1_tx;
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_TIM3_Init();
MX_USART1_UART_Init();
MX_USART2_UART_Init();
MX_DMA_Init();
MX_I2C2_Init();
/* USER CODE BEGIN 2 */
for (uint8_t n = 0; n < 20; ++n) {
tx_buffer[n] = n;
}
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_GPIO_WritePin(DR_ENABLE_GPIO_Port,DR_ENABLE_Pin,GPIO_PIN_SET);
if (HAL_UART_Transmit_DMA(&huart1, tx_buffer, 20) == HAL_OK) {
HAL_GPIO_WritePin(DR_ENABLE_GPIO_Port,DR_ENABLE_Pin,GPIO_PIN_RESET);
HAL_GPIO_TogglePin(ERROR_LED_GPIO_Port, ERROR_LED_Pin);
}
if(HAL_GPIO_ReadPin(X0_GPIO_Port, X0_Pin) == GPIO_PIN_SET){
HAL_GPIO_WritePin(Y0_GPIO_Port, Y0_Pin, GPIO_PIN_SET);
}else {
HAL_GPIO_WritePin(Y0_GPIO_Port, Y0_Pin, GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X1_GPIO_Port, X1_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X2_GPIO_Port, X2_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y2_GPIO_Port, Y2_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y2_GPIO_Port, Y2_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X3_GPIO_Port, X3_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y3_GPIO_Port, Y3_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y3_GPIO_Port, Y3_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X4_GPIO_Port, X4_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y4_GPIO_Port, Y4_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y4_GPIO_Port, Y4_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X5_GPIO_Port, X5_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y5_GPIO_Port, Y5_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y5_GPIO_Port, Y5_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X6_GPIO_Port, X6_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y6_GPIO_Port, Y6_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y6_GPIO_Port, Y6_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X7_GPIO_Port, X7_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y7_GPIO_Port, Y7_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y7_GPIO_Port, Y7_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X8_GPIO_Port, X8_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X9_GPIO_Port, X9_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X10_GPIO_Port, X10_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X11_GPIO_Port, X11_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X12_GPIO_Port, X12_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
if (HAL_GPIO_ReadPin(X13_GPIO_Port, X13_Pin) == GPIO_PIN_SET) {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_SET);
} else {
HAL_GPIO_WritePin(Y1_GPIO_Port, Y1_Pin,GPIO_PIN_RESET);
}
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK1;
if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %drn", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

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