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STM32L476串口DMA应用

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ID:417297 发表于 2018-10-29 15:38 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
串口DMA应用

STM32L476单片机源程序如下:
  1. /* Includes ------------------------------------------------------------------*/
  2. #include "main.h"
  3. #include "stm32l4xx_hal.h"
  4. #include "dma.h"
  5. #include "usart.h"
  6. #include "gpio.h"

  8. /* USER CODE BEGIN Includes */
  9. #include "led_blink.h"
  10. /* USER CODE END Includes */

  12. /* Private variables ---------------------------------------------------------*/

  14. /* USER CODE BEGIN PV */
  15. /* Private variables ---------------------------------------------------------*/
  16. #define APP_BUF_LEN     100
  17.    
  18. uint8_t app_buf[APP_BUF_LEN];
  19. /* USER CODE END PV */

  21. /* Private function prototypes -----------------------------------------------*/
  22. void SystemClock_Config(void);

  24. /* USER CODE BEGIN PFP */
  25. /* Private function prototypes -----------------------------------------------*/

  27. /* USER CODE END PFP */

  29. /* USER CODE BEGIN 0 */

  31. /* USER CODE END 0 */

  33. int main(void)
  34. {

  36.   /* USER CODE BEGIN 1 */
  37.   uint16_t msgLen = 0;
  38.   /* USER CODE END 1 */

  40.   /* MCU Configuration----------------------------------------------------------*/

  42.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  43.   HAL_Init();

  45.   /* USER CODE BEGIN Init */

  47.   /* USER CODE END Init */

  49.   /* Configure the system clock */
  50.   SystemClock_Config();

  52.   /* USER CODE BEGIN SysInit */

  54.   /* USER CODE END SysInit */

  56.   /* Initialize all configured peripherals */
  57.   MX_GPIO_Init();
  58.   MX_DMA_Init();
  59.   MX_USART1_UART_Init();

  61.   /* USER CODE BEGIN 2 */
  62.   Bsp_init();
  63.   HAL_LedCtl_Init();
  64.   HAL_UARTDMA_Init();
  65.   printf("NB_EK Uart in DMA example\r\n");
  66.   /* USER CODE END 2 */

  68.   /* Infinite loop */
  69.   /* USER CODE BEGIN WHILE */
  70.   while (1)
  71.   {
  72.   /* USER CODE END WHILE */

  74.   /* USER CODE BEGIN 3 */
  75.     HAL_Led_poll();
  76.     if(HAL_UART_Poll())
  77.     {
  78.       msgLen = HAL_UART_RxBufLen();
  79.       
  80.       if(msgLen > APP_BUF_LEN)
  81.       {
  82.         msgLen = APP_BUF_LEN;
  83.       }
  84.       msgLen = HAL_UART_Read(app_buf,msgLen);
  85.       HAL_UART_Write(app_buf,msgLen);
  86.       HAL_LED_Blink(200,20,1);
  87.     }
  88.   }
  89.   /* USER CODE END 3 */

  91. }

  93. /** System Clock Configuration
  94. */
  95. void SystemClock_Config(void)
  96. {

  98.   RCC_OscInitTypeDef RCC_OscInitStruct;
  99.   RCC_ClkInitTypeDef RCC_ClkInitStruct;
  100.   RCC_PeriphCLKInitTypeDef PeriphClkInit;

  102.     /**Initializes the CPU, AHB and APB busses clocks
  103.     */
  104.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  105.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  106.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  107.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  108.   RCC_OscInitStruct.PLL.PLLM = 1;
  109.   RCC_OscInitStruct.PLL.PLLN = 20;
  110.   RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  111.   RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  112.   RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  113.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  114.   {
  115.     _Error_Handler(__FILE__, __LINE__);
  116.   }

  118.     /**Initializes the CPU, AHB and APB busses clocks
  119.     */
  120.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
  121.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  122.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  123.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  124.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  125.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  127.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
  128.   {
  129.     _Error_Handler(__FILE__, __LINE__);
  130.   }

  132.   PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART1;
  133.   PeriphClkInit.Usart1ClockSelection = RCC_USART1CLKSOURCE_PCLK2;
  134.   if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
  135.   {
  136.     _Error_Handler(__FILE__, __LINE__);
  137.   }

  139.     /**Configure the main internal regulator output voltage
  140.     */
  141.   if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  142.   {
  143.     _Error_Handler(__FILE__, __LINE__);
  144.   }

  146.     /**Configure the Systick interrupt time
  147.     */
  148.   HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

  150.     /**Configure the Systick
  151.     */
  152.   HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  154.   /* SysTick_IRQn interrupt configuration */
  155.   HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
  156. }

  158. /* USER CODE BEGIN 4 */

  160. /* USER CODE END 4 */

  162. /**
  163.   * @brief  This function is executed in case of error occurrence.
  164.   * @param  None
  165.   * @retval None
  166.   */
  167. void _Error_Handler(char * file, int line)
  168. {
  169.   /* USER CODE BEGIN Error_Handler_Debug */
  170.   /* User can add his own implementation to report the HAL error return state */
  171.   while(1)
  172.   {
  173.   }
  174.   /* USER CODE END Error_Handler_Debug */
  175. }

  177. #ifdef USE_FULL_ASSERT

  179. /**
  180.    * @brief Reports the name of the source file and the source line number
  181.    * where the assert_param error has occurred.
  182.    * @param file: pointer to the source file name
  183.    * @param line: assert_param error line source number
  184.    * @retval None
  185.    */
  186. void assert_failed(uint8_t* file, uint32_t line)
  187. {
  188.   /* USER CODE BEGIN 6 */
  189.   /* User can add his own implementation to report the file name and line number,
  190.     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
  191.   /* USER CODE END 6 */

  193. }

  195. #endif

  197. /**
  198.   * @}
  199.   */

  201. /**
  202.   * @}
  203. */

  205. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
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所有资料51hei提供下载:
07-串口DMA接发实验.rar (9.24 MB, 下载次数: 40)



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沙发
ID:370815 发表于 2019-10-2 14:56 | 只看该作者
为啥我用这段代码，串口工具只有接收，不能发送呢
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