stm32f103單線半雙工uart通信程序

ID:476222 · 發(fā)表于 2020-1-18 21:48

在使用數(shù)字舵機(jī)時(shí)，所用到的通信方式為uart通信，但舵機(jī)只有三根接線，出去vcc和gnd，只有一條通信線，也就是說要實(shí)現(xiàn)雙向通信，只能使用單線半雙工模式，本人在利用stm32標(biāo)準(zhǔn)庫(kù)配置uart串口時(shí)，發(fā)現(xiàn)標(biāo)準(zhǔn)庫(kù)配置較為繁瑣，且容錯(cuò)率較低，稍有不慎，uart就無法實(shí)現(xiàn)單項(xiàng)通信，遂決定使用STcubeMX軟件，使用官方hal庫(kù)對(duì)單片機(jī)進(jìn)行配置，自己摸索實(shí)屬不易，現(xiàn)僅能實(shí)現(xiàn)uart1接收再通過uart1發(fā)送，以STM32F103C8為例，僅通過A9即可實(shí)現(xiàn)上位機(jī)與單片機(jī)之間的通訊。現(xiàn)將相關(guān)文件上傳。

單片機(jī)源程序如下:

/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.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 */
/* 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 */
uint32_t preticks;
uint16_t i,len;
/* 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_USART1_UART_Init();
/* USER CODE BEGIN 2 */
printf("hello this is one wire uart demo: \r\n");
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if( (BufWrite != BufRead) && (RevTicks > 5) )
{
len = (BufWrite+255-BufRead)%255;
HAL_HalfDuplex_EnableTransmitter(&huart1);
for( i = 0; i< len ; i++)
{
HAL_UART_Transmit(&huart1,RxBuf+BufRead,1,100 );
BufRead++;
}
HAL_HalfDuplex_EnableReceiver(&huart1);
printf("\r\n");
}
}
/* 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 CPU, AHB and APB busses clocks
*/
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 busses 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();
}
}
/* USER CODE BEGIN 4 */
int fputc( int dat, FILE *file )
{
uint8_t ch = dat;
HAL_HalfDuplex_EnableTransmitter(&huart1);
HAL_UART_Transmit(&huart1,&ch,1,100 );
HAL_HalfDuplex_EnableReceiver(&huart1);
}
/* 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 */
/* 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,
tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

復(fù)制代碼

所有資料51hei提供下載:

stm32_1wireusart.7z (32.9 KB, 下載次數(shù): 57)

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stm32f103單線半雙工uart通信程序

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