一个串口问题

发布于 2018-06-11 20:16:44 浏览：1607 订阅该版

* 本帖最后由 我算没治了 于 2018-6-12 13:59 编辑 *

```void my_usart_init(u32 bound)
{
       GPIO_InitTypeDef GPIO_InitStructure;
	USART_InitTypeDef USART_InitStructure;
	NVIC_InitTypeDef NVIC_InitStructure;
	
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); 
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE); 
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
	
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource10,GPIO_AF_USART3); 
	GPIO_PinAFConfig(GPIOB,GPIO_PinSource11,GPIO_AF_USART3);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); 
	GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10| GPIO_Pin_11; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	
	//GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
	GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;	
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; 
	GPIO_Init(GPIOA,&GPIO_InitStructure);

USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Rx;
        USART_Init(USART3, &USART_InitStructure); 
	
        USART_Cmd(USART3, ENABLE); 
	
	USART_InitStructure.USART_BaudRate = bound;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_Mode = USART_Mode_Tx;	
        USART_Init(USART1, &USART_InitStructure); 
	
        USART_Cmd(USART1, ENABLE); 
	
	#if EN_USART1_RX	
	USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
	NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
	NVIC_InitStructure.NVIC_IRQChannelSubPriority =3;	
	NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
	NVIC_Init(&NVIC_InitStructure);

#endif
}

void USART3_IRQHandler(void)                	
{
        u8 Res;
#if SYSTEM_SUPPORT_OS 		
	OSIntEnter();    
#endif
	if(USART_GetITStatus(USART3, USART_IT_RXNE) != RESET) 
	{
		Res =USART_ReceiveData(USART3);

if((USART_RX_STA&0x8000)==0)
		{
			if(USART_RX_STA&0x4000)
			{
				if(Res!=0x0a)USART_RX_STA=0;
				else USART_RX_STA|=0x8000;
			}
			else 
			{	
				if(Res==0x0d)USART_RX_STA|=0x4000;
				else
				{
					USART_RX_BUF[USART_RX_STA&0X3FFF]=Res ;
					USART_RX_STA++;
					if(USART_RX_STA>(USART_REC_LEN-1))USART_RX_STA=0;
				}		 
			}
		}   		 
  } 
#if SYSTEM_SUPPORT_OS 	
	OSIntExit();  											 
#endif
} 
#endif

void usart1_send(void)
{
  u8 t;
	u8 len;	 
	NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
	//delay_init(168);	
	my_usart_init(9600);	
	while(1)
	{
		if(USART_RX_STA&0x8000)
		{				
			len=USART_RX_STA&0x3fff;
			rt_kprintf(" <br>Äú·¢ËÍµÄÏûÏ¢Îª: <br>");
			for(t=0;t<len;t++)
			{
				USART_SendData(USART1, USART_RX_BUF[t]);     
				while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET);
			}
		  rt_kprintf("<br>");
			USART_RX_STA=0;
		}	
	}
}

#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(usart1_send, startup usart1_send);
#endif
```bsp是stm32f40x，我在代码里写了个串口收发的api，并在finsh设置了命令行，我用串口3接收外界的数据，串口1将数据发送给电脑，为什么执行之后没有反应？
![串口api.JPG](https://oss-club.rt-thread.org/uploads/201806/11/201628k7xf93cdxoyyxlpo.jpg)

![串口发送.JPG](https://oss-club.rt-thread.org/uploads/201806/11/201629ycl05w0ym3glz3go.jpg)