标题: stm32f103单线半双工uart通信程序 [打印本页]

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作者: 秋名山lyb    时间: 2020-1-18 21:48
标题: stm32f103单线半双工uart通信程序
在使用数字舵机时，所用到的通信方式为uart通信，但舵机只有三根接线，出去vcc和gnd，只有一条通信线，也就是说要实现双向通信，只能使用单线半双工模式，本人在利用stm32标准库配置uart串口时，发现标准库配置较为繁琐，且容错率较低，稍有不慎，uart就无法实现单项通信，遂决定使用STcubeMX软件，使用官方hal库对单片机进行配置，自己摸索实属不易，现仅能实现uart1接收再通过uart1发送，以STM32F103C8为例，仅通过A9即可实现上位机与单片机之间的通讯。现将相关文件上传。

单片机源程序如下:

1. /* USER CODE END Header */
   
2. 
   
3. /* Includes ------------------------------------------------------------------*/
   
4. #include "main.h"
   
5. #include "usart.h"
   
6. #include "gpio.h"
   
7. 
   
8. /* Private includes ----------------------------------------------------------*/
   
9. /* USER CODE BEGIN Includes */
   
10. 
    
11. /* USER CODE END Includes */
    
12. 
    
13. /* Private typedef -----------------------------------------------------------*/
    
14. /* USER CODE BEGIN PTD */
    
15. 
    
16. /* USER CODE END PTD */
    
17. 
    
18. /* Private define ------------------------------------------------------------*/
    
19. /* USER CODE BEGIN PD */
    
20. 
    
21. /* USER CODE END PD */
    
22. 
    
23. /* Private macro -------------------------------------------------------------*/
    
24. /* USER CODE BEGIN PM */
    
25. 
    
26. /* USER CODE END PM */
    
27. 
    
28. /* Private variables ---------------------------------------------------------*/
    
29. 
    
30. /* USER CODE BEGIN PV */
    
31. 
    
32. /* USER CODE END PV */
    
33. 
    
34. /* Private function prototypes -----------------------------------------------*/
    
35. void SystemClock_Config(void);
    
36. /* USER CODE BEGIN PFP */
    
37. 
    
38. /* USER CODE END PFP */
    
39. 
    
40. /* Private user code ---------------------------------------------------------*/
    
41. /* USER CODE BEGIN 0 */
    
42. 
    
43. /* USER CODE END 0 */
    
44. 
    
45. /**
    
46.   * @brief  The application entry point.
    
47.   * @retval int
    
48.   */
    
49. int main(void)
    
50. {
    
51.   /* USER CODE BEGIN 1 */
    
52.         uint32_t preticks;
    
53.         uint16_t i,len;
    
54.   /* USER CODE END 1 */
    
55. 
    
56.   /* MCU Configuration--------------------------------------------------------*/
    
57. 
    
58.   /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
    
59.   HAL_Init();
    
60. 
    
61.   /* USER CODE BEGIN Init */
    
62. 
    
63.   /* USER CODE END Init */
    
64. 
    
65.   /* Configure the system clock */
    
66.   SystemClock_Config();
    
67. 
    
68.   /* USER CODE BEGIN SysInit */
    
69. 
    
70.   /* USER CODE END SysInit */
    
71. 
    
72.   /* Initialize all configured peripherals */
    
73.   MX_GPIO_Init();
    
74.   MX_USART1_UART_Init();
    
75.   /* USER CODE BEGIN 2 */
    
76. 
    
77.         printf("hello this is one wire uart demo: \r\n");
    
78.   /* USER CODE END 2 */
    
79. 
    
80.   /* Infinite loop */
    
81.   /* USER CODE BEGIN WHILE */
    
82.   while (1)
    
83.   {
    
84.     /* USER CODE END WHILE */
    
85. 
    
86.     /* USER CODE BEGIN 3 */
    
87.                 if( (BufWrite  != BufRead) && (RevTicks > 5) )
    
88.                 {
    
89.                         len = (BufWrite+255-BufRead)%255;
    
90.                         HAL_HalfDuplex_EnableTransmitter(&huart1);
    
91.                        
    
92.                         for( i = 0; i< len ; i++)
    
93.                         {
    
94.                                 HAL_UART_Transmit(&huart1,RxBuf+BufRead,1,100 );
    
95.                                 BufRead++;
    
96.                         }
    
97.                        
    
98.                         HAL_HalfDuplex_EnableReceiver(&huart1);
    
99.                        
    
100.                         printf("\r\n");
     
101.                 }
     
102.   }
     
103.   /* USER CODE END 3 */
     
104. }
     
105. 
     
106. /**
     
107.   * @brief System Clock Configuration
     
108.   * @retval None
     
109.   */
     
110. void SystemClock_Config(void)
     
111. {
     
112.   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
     
113.   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
     
114. 
     
115.   /**Initializes the CPU, AHB and APB busses clocks
     
116.   */
     
117.   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
     
118.   RCC_OscInitStruct.HSEState = RCC_HSE_ON;
     
119.   RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
     
120.   RCC_OscInitStruct.HSIState = RCC_HSI_ON;
     
121.   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
     
122.   RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
     
123.   RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
     
124.   if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
     
125.   {
     
126.     Error_Handler();
     
127.   }
     
128.   /**Initializes the CPU, AHB and APB busses clocks
     
129.   */
     
130.   RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
     
131.                               |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
     
132.   RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
     
133.   RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
     
134.   RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
     
135.   RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
     
136. 
     
137.   if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
     
138.   {
     
139.     Error_Handler();
     
140.   }
     
141. }
     
142. 
     
143. /* USER CODE BEGIN 4 */
     
144. int fputc( int dat, FILE *file )
     
145. {
     
146.         uint8_t ch = dat;
     
147.        
     
148.         HAL_HalfDuplex_EnableTransmitter(&huart1);
     
149.         HAL_UART_Transmit(&huart1,&ch,1,100 );
     
150.         HAL_HalfDuplex_EnableReceiver(&huart1);
     
151.        
     
152. }
     
153. 
     
154. /* USER CODE END 4 */
     
155. 
     
156. /**
     
157.   * @brief  This function is executed in case of error occurrence.
     
158.   * @retval None
     
159.   */
     
160. void Error_Handler(void)
     
161. {
     
162.   /* USER CODE BEGIN Error_Handler_Debug */
     
163.   /* User can add his own implementation to report the HAL error return state */
     
164. 
     
165.   /* USER CODE END Error_Handler_Debug */
     
166. }
     
167. 
     
168. #ifdef  USE_FULL_ASSERT
     
169. /**
     
170.   * @brief  Reports the name of the source file and the source line number
     
171.   *         where the assert_param error has occurred.
     
172.   * @param  file: pointer to the source file name
     
173.   * @param  line: assert_param error line source number
     
174.   * @retval None
     
175.   */
     
176. void assert_failed(uint8_t *file, uint32_t line)
     
177. {
     
178.   /* USER CODE BEGIN 6 */
     
179.   /* User can add his own implementation to report the file name and line number,
     
180.      tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
     
181.   /* USER CODE END 6 */
     
182. }
     
183. #endif /* USE_FULL_ASSERT */
     
184. 
     
185. /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
     

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