为什么STM32f103c8t6 DMA不发送静态数据呢？

我在多维数据集中设置了一个项目。SPI+DMA。当 mcu 从堆栈发送数据时，DMA 工作正常并且活动在引脚上可见。但是，如果将 bss 中的数据数组分配为静态或全局数据，则引脚上不会发生任何事情。程序正常运行，正确的状态被输入到 DMA 寄存器中。但是在 SPI 寄存器中没有可见的活动。为什么 DMA 不发送静态数据？

• /* USER CODE BEGIN Header */
• /**
•   ******************************************************************************
•   * @file           : main.c
•   * @brief          : Main program body
•   ******************************************************************************
•   * @attention
•   *
•   *

  © Copyright (c) 2021 STMicroelectronics.

    * All rights reserved.

•   *
•   * This software component is licensed by ST under BSD 3-Clause license,
•   * the "License"; You may not use this file except in compliance with the
•   * License. You may obtain a copy of the License at:
•   *                        opensource.org/licenses/BSD-3-Clause
•   *
•   ******************************************************************************
•   */
• /* USER CODE END Header */
• /* Includes ------------------------------------------------------------------*/
• #include "main.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 ---------------------------------------------------------*/
• SPI_HandleTypeDef hspi2;
• DMA_HandleTypeDef hdma_spi2_tx;
• /* USER CODE BEGIN PV */
• /* USER CODE END PV */
• /* Private function prototypes -----------------------------------------------*/
• void SystemClock_Config(void);
• static void MX_GPIO_Init(void);
• static void MX_DMA_Init(void);
• static void MX_SPI2_Init(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
•   */
• //static uint8_t data[6]; //not works
• 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_DMA_Init();
•   MX_SPI2_Init();
•   /* USER CODE BEGIN 2 */
•   /* USER CODE END 2 */
•   uint8_t data[6]; //works fine
•   /* Infinite loop */
•   /* USER CODE BEGIN WHILE */
•   while (1)
•   {
•     /* USER CODE END WHILE */
•       HAL_Delay(1000);
•       HAL_SPI_Transmit_DMA(&hspi2, data, sizeof(data));
•     /* USER CODE BEGIN 3 */
•   }
•   /* USER CODE END 3 */
• }
• /**
•   * @brief System Clock Configuration
•   * @retval None
•   */
• void SystemClock_Config(void)
• {
•   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
•   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
•   /** Initializes the RCC Oscillators according to the specified parameters
•   * in the RCC_OscInitTypeDef structure.
•   */
•   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
•   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
•   RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
•   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
•   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
•   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
•   RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
•   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_CLOCKTYPE_PCLK2;
•   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
•   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
•   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
•   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
•   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
•   {
•     Error_Handler();
•   }
• }
• /**
•   * @brief SPI2 Initialization Function
•   * @param None
•   * @retval None
•   */
• static void MX_SPI2_Init(void)
• {
•   /* USER CODE BEGIN SPI2_Init 0 */
•   /* USER CODE END SPI2_Init 0 */
•   /* USER CODE BEGIN SPI2_Init 1 */
•   /* USER CODE END SPI2_Init 1 */
•   /* SPI2 parameter configuration*/
•   hspi2.Instance = SPI2;
•   hspi2.Init.Mode = SPI_MODE_MASTER;
•   hspi2.Init.Direction = SPI_DIRECTION_1LINE;
•   hspi2.Init.DataSize = SPI_DATASIZE_8BIT;
•   hspi2.Init.CLKPolarity = SPI_POLARITY_LOW;
•   hspi2.Init.CLKPhase = SPI_PHASE_1EDGE;
•   hspi2.Init.NSS = SPI_NSS_SOFT;
•   hspi2.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_32;
•   hspi2.Init.FirstBit = SPI_FIRSTBIT_MSB;
•   hspi2.Init.TIMode = SPI_TIMODE_DISABLE;
•   hspi2.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
•   hspi2.Init.CRCPolynomial = 10;
•   if (HAL_SPI_Init(&hspi2) != HAL_OK)
•   {
•     Error_Handler();
•   }
•   /* USER CODE BEGIN SPI2_Init 2 */
•   /* USER CODE END SPI2_Init 2 */
• }
• /**
•   * Enable DMA controller clock
•   */
• static void MX_DMA_Init(void)
• {
•   /* DMA controller clock enable */
•   __HAL_RCC_DMA1_CLK_ENABLE();
•   /* DMA interrupt init */
•   /* DMA1_Channel5_IRQn interrupt configuration */
•   HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
•   HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);
• }
• /**
•   * @brief GPIO Initialization Function
•   * @param None
•   * @retval None
•   */
• static void MX_GPIO_Init(void)
• {
•   /* GPIO Ports Clock Enable */
•   __HAL_RCC_GPIOC_CLK_ENABLE();
•   __HAL_RCC_GPIOD_CLK_ENABLE();
•   __HAL_RCC_GPIOB_CLK_ENABLE();
•   __HAL_RCC_GPIOA_CLK_ENABLE();
• }
• /* USER CODE BEGIN 4 */
• /* USER CODE END 4 */
• /**
•   * @brief  Period elapsed callback in non blocking mode
•   * @note   This function is called  when TIM2 interrupt took place, inside
•   * HAL_TIM_IRQHandler(). It makes a direct call to HAL_IncTick() to increment
•   * a global variable "uwTick" used as application time base.
•   * @param  htim : TIM handle
•   * @retval None
•   */
• void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *htim)
• {
•   /* USER CODE BEGIN Callback 0 */
•   /* USER CODE END Callback 0 */
•   if (htim->Instance == TIM2) {
•     HAL_IncTick();
•   }
•   /* USER CODE BEGIN Callback 1 */
•   /* USER CODE END Callback 1 */
• }
• /**
•   * @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 */
• /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/