A USER CODE BEGIN 2printf("Get time fail,status is d\r\n",status):while(DHTll Init()) printf("DHTll Checked failed!!! r nr) :HAL Delay(500): printf("DHTll Checked Sucess!!!\r\n") ; /A USER CODE END 2 */ /x Infinite loop */YA USER CODE BEGIN WHILE */ while (1) status=HAL RTC GetTime (chrtc, sTime,RTC FORMAT BIN):if(status != HAL OK)( printf("get time fail,status is ed\r n",status): status=HAL RTC GetDate(chrtc, sDate,RTC FORMAT BIN):if(status ! HAL OK) (printf("get date fail,status is ed\r n",status): orintf"sd-d-td d rin dsdid-dr n",2000-Dare ear anae Month,sare are nare eekay,slime Moursstime Minutes.mime secondDHTll Read Datalstemperature.chumidity) : printf(uDHTll Temperature =d,d degree r n",temperature>>8,temperaturesOxff):printf("DHTll Humidity = d,%ds% r n"humidity>>8,humidity&Oxff);
时间: 2024-03-30 20:40:52 浏览: 93
I'm sorry, but I'm having trouble understanding your question. The code you provided appears to be incomplete and contains syntax errors. Can you please provide more context or clarify your question?
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uint8_t RxFlag = 0; uint8_t RxCount = 0; extern DMA_HandleTypeDef hdma_usart1_rx; #define LENGTH 100 int fputc(int ch, FILE *f) { HAL_UART_Transmit (&huart1, (uint8_t *)&ch, 1,HAL_MAX_DELAY); return ch; } /* 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_DMA_Init(); MX_USART1_UART_Init(); /* USER CODE BEGIN 2 */ printf("******UART communication AA using IDLE TT + DMA******\r\n"); __HAL_UART_ENABLE_IT(&huart1,UART_IT_IDLE); //使能IDLE中断 HAL_UART_Receive_DMA(&huart1,(uint8_t *)RxBuffer, LENGTH); //启动DMA接收 /* USER CODE END 2 */ /* Infinite loop */ /* USER CODE BEGIN WHILE */ while (1) { /* USER CODE END WHILE */ /* USER CODE BEGIN 3 */ if(RxFlag==1) { RxFlag = 0; HAL_UART_DMAStop(&huart1); //停止串口DMA传输 RxCount = LENGTH - __HAL_DMA_GET_COUNTER(&hdma_usart1_rx); HAL_UART_Transmit(&huart1,(uint8_t *)RxBuffer, RxCount,100); for(uint8_t i = 0; i < RxCount; i++) { RxBuffer[i]=0; } RxCount = 0; //重启动DMA HAL_UART_Receive_DMA(&huart1,(uint8_t *)RxBuffer, LENGTH); } } /* USER CODE END 3 */ },这段代码的作用是什么?
这段代码实现了在STM32单片机上使用UART与PC进行通信,并通过DMA进行数据接收。主要功能是通过串口接收数据并将其回显到PC端,其中用到了UART中断和DMA传输。具体实现流程如下:
1. 初始化所有的外设(包括GPIO、DMA、UART等);
2. 通过HAL_UART_Receive_DMA函数启动DMA接收,并启用IDLE中断;
3. 在while(1)循环中,判断是否接收到了数据,如果接收到了数据,则停止DMA传输,得到接收数据的长度RxCount,并将接收到的数据通过UART回显到PC端;
4. 重启DMA传输,等待下一次数据的到来。
需要注意的是,这段代码中使用了printf函数来输出提示信息,因此需要在代码中实现fputc函数,将printf输出的信息通过UART发送出去。
int n; while(1) { menu(); printf("请输入功能数字:\n"); status=scanf("%d",&flag); while(status!=1) { //输入非法字符,请重新输入 while(getchar()!='\n'); printf("输入错误,请重新输入:"); status=scanf("%d",&flag); } switch(flag) { case 1: printf("请输入集合A\n"); printf("输入元素个数:"); status=scanf("%d",&n); while(status!=1) { //输入非法字符,请重新输入 while(getchar()!='\n'); printf("输入错误,请重新输入:"); status=scanf("%d",&n); } i=0; while(i<n) { Input(L1); i++; } Delete(L1); Output(L1); printf("请输入集合B\n"); printf("输入元素个数:"); status=scanf("%d",&n); while(status!=1) { //输入非法字符,请重新输入 while(getchar()!='\n'); printf("输入错误,请重新输入:"); status=scanf("%d",&n); } i=0; while(i<n) { Input(L2); i++; } Delete(L2); Output(L2); printf("集合输入已完成,按任意键继续。。。"); ch(); system("cls"); break;
这段代码是一个无限循环(while(1)),在循环体内会先输出一个菜单,然后要求用户输入一个数字,对输入的数字进行判断,并根据不同的数字执行不同的操作。具体来说,如果输入的数字是1,那么会要求用户输入两个集合A和B,先输入集合A,输入元素的个数,然后循环输入每个元素,再删除重复元素,最后输出集合A。然后输入集合B,同样输入元素的个数,循环输入每个元素,删除重复元素,最后输出集合B。最后输出一行提示信息,等待用户按下任意键继续,然后清屏,回到菜单循环。如果用户输入的数字不是1,那么会执行对应的操作,但是这段代码没有给出对应的操作,需要在后面的代码中添加。
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